超强Redis数据类型与应用场景总结！！（含完整实战案例，建议收藏）
作者：互联网
本文全面讲述了Redis的五大数据类型和使用场景，含完整实战案例，建议收藏！！
大家好，我是冰河~~
最近面试跳槽的小伙伴有点多，给我反馈的面试情况更是千差万别，不过很多小伙伴反馈说：面试中的大部分问题都能够在我的CSDN博客中找到答案，面试过程还是挺轻松的，最终也是轻松的拿到了Offer！听到这些，我也确实替小伙伴们高兴！
今天，在安排一篇Redis技术干货。如果文章对你有点帮助，小伙伴们点赞、收藏、评论、分享走起呀~~
好了，开始今天的正文~~
关于Redis
我们先来聊聊Redis的基础知识。
基于键值对的存储系统 ：字典形式。
五种数据结构：字符串(String)，Hash(字典)，列表(List)，集合(Set)，有序集合(Sorted Set)。
Redis大部分时间用来做缓存，因为速度快(内存数据库，单线程，单进程，Redis 6.0支持多线程，后面我们会详细讲Redis 6.0的新特性 )。
Redis的使用场景
- 做缓存：String类型最多，其次是hash(字典)，value值使用的最多的是json格式。
- 计数(自增)：点赞数，点踩数，访问数，全局计数等。
- 消息队列：列表类型，先进先出或者先进后出，bloop。这个可以参考我写的一个开源框架，地址为：https://github.com/sunshinelyz/mykit-delay。
- 发布订阅(观察者模式)
- 排行榜：有序集合
- 分布式锁：小伙伴们可以参考我写的《【高并发】高并发分布式锁架构解密，不是所有的锁都是分布式锁！！》，也可以参考我写的一个分布式锁插件，链接地址为：https://github.com/sunshinelyz/mykit-lock。
- 做附近的人
- 布隆过滤器
- 统计在线人数(Bitmap)等等
以下使用场景也是5大数据类型中的一种：
- BitMaps位图：布隆过滤器 本质是字符串
- HyperLogLog:超小内存唯一值计数，12kb HyperLogLog 本质是 字符串
- GEO：地理信息定位 本质是有序集合
主从复制: 主服务器和从服务器，Redis中的数据可以从主服务器同步到从服务器上。
高可用和分布式：
- 2.8版本以后使用redis-sentinel支持高可用（做哨兵）
- 3.0版本以后支持分布式
五大数据类型
String（字符串）
string类型是二进制安全的。意思是redis的string可以包含任何数据。比如jpg图片或者序列化的对象 。
string类型是Redis最基本的数据类型，一个redis中字符串value最多可以是512M。
Hash（哈希）
Redis hash 是一个键值对集合。
Redis hash是一个string类型的field和value的映射表，hash特别适合用于存储对象。
类似Java里面的Map<String,Object>
List（列表）
Redis 列表是简单的字符串列表，按照插入顺序排序。你可以添加一个元素导列表的头部（左边）或者尾部（右边）。底层实际是个链表。
Set（集合）
Redis的Set是string类型的无序集合。它是通过HashTable实现的。
Zset(sorted set：有序集合)
Redis zset 和 set 一样也是string类型元素的集合,且不允许重复的成员。不同的是每个元素都会关联一个double类型的分数。Redis正是通过分数来为集合中的成员进行从小到大的排序。zset的成员是唯一的,但分数(score)却可以重复。
使用案例
这里，为了让小伙伴们更加清晰的理解如何使用Java客户端来操作Redis数据，我们会分别使用Jedis和JedisCluster来演示如何操作Redis中的数据。
准备工作
通过maven引入Jedis的依赖包。
<dependency>
<groupId>redis.clients</groupId>
<artifactId>jedis</artifactId>
<version>2.9.0</version>
<type>jar</type>
<scope>compile</scope>
</dependency>
Jedis的使用
创建Jedis对象，set方法存储key-value值，get方法获取key对应的值。主要是用于单个redis。
Jedis jedis = new Jedis("192.168.175.100", 6379);
jedis.set("Jedis", "Hello Work!");
System.out.println(jedis.get("Jedis"));
jedis.close()
这里是使用IDEA编辑器对Jedis类结构的一个关系图，从图中看出Jedis继承BinaryJedis，实现多个接口。
每一个接口都代表了一类Redis命令，例如JedisCommands中包含了SET GET等命令，MultiKeyCommands中包含了针对多个Key的MSET MGET等命令。
接下来，我们给出Jedis测试Redis五大数据类型的完整测试代码。
分类代码：
- 获取Jedis句柄
private static Jedis jedis;
static {
jedis = new Jedis("192.168.175.100", 6379);
jedis.auth("123456"); // 之前我在redis配置中配置了权限密码，这里需要设置
}
- key-value数据
/**
* 测试key - value 的数据
* @throws InterruptedException
*/
@Test
public void testKey() throws InterruptedException {
System.out.println("清空数据："+jedis.flushDB());
System.out.println("判断某个键是否存在："+jedis.exists("username"));
System.out.println("新增<'username','wukong'>的键值对："+jedis.set("username", "wukong"));
System.out.println("是否存在:"+jedis.exists("name"));
System.out.println("新增<'password','password'>的键值对："+jedis.set("password", "password"));
Set<String> keys = jedis.keys("*");
System.out.println("系统中所有的键如下："+keys);
System.out.println("删除键password:"+jedis.del("password"));
System.out.println("判断键password是否存在："+jedis.exists("password"));
System.out.println("设置键username的过期时间为5s:"+jedis.expire("username", 5));
TimeUnit.SECONDS.sleep(2);
System.out.println("查看键username的剩余生存时间："+jedis.ttl("username"));
System.out.println("移除键username的生存时间："+jedis.persist("username"));
System.out.println("查看键username的剩余生存时间："+jedis.ttl("username"));
System.out.println("查看键username所存储的值的类型："+jedis.type("username"));
}
- 字符串操作
/***
* 字符串操作
* memcached和redis同样有append的操作，但是memcached有prepend的操作，redis中并没有。
* @throws InterruptedException
*/
@Test
public void testString() throws InterruptedException {
jedis.flushDB();
System.out.println("===========增加数据===========");
System.out.println(jedis.set("key1","value1"));
System.out.println(jedis.set("key2","value2"));
System.out.println(jedis.set("key3", "value3"));
System.out.println("删除键key2:"+jedis.del("key2"));
System.out.println("获取键key2:"+jedis.get("key2"));
System.out.println("修改key1:"+jedis.set("key1", "value1Changed"));
System.out.println("获取key1的值："+jedis.get("key1"));
System.out.println("在key3后面加入值："+jedis.append("key3", "End"));
System.out.println("key3的值："+jedis.get("key3"));
System.out.println("增加多个键值对："+jedis.mset("key01","value01","key02","value02","key03","value03"));
System.out.println("获取多个键值对："+jedis.mget("key01","key02","key03"));
System.out.println("获取多个键值对："+jedis.mget("key01","key02","key03","key04"));
System.out.println("删除多个键值对："+jedis.del(new String[]{"key01","key02"}));
System.out.println("获取多个键值对："+jedis.mget("key01","key02","key03"));
jedis.flushDB();
System.out.println("===========新增键值对防止覆盖原先值==============");
System.out.println(jedis.setnx("key1", "value1"));
System.out.println(jedis.setnx("key2", "value2"));
System.out.println(jedis.setnx("key2", "value2-new"));
System.out.println(jedis.get("key1"));
System.out.println(jedis.get("key2"));
System.out.println("===========新增键值对并设置有效时间=============");
System.out.println(jedis.setex("key3", 2, "value3"));
System.out.println(jedis.get("key3"));
TimeUnit.SECONDS.sleep(3);
System.out.println(jedis.get("key3"));
System.out.println("===========获取原值，更新为新值==========");//GETSET is an atomic set this value and return the old value command.
System.out.println(jedis.getSet("key2", "key2GetSet"));
System.out.println(jedis.get("key2"));
System.out.println("获得key2的值的字串："+jedis.getrange("key2", 2, 4));
}
- 整数和浮点数
/***
* 整数和浮点数
*/
@Test
public void testNumber() {
jedis.flushDB();
jedis.set("key1", "1");
jedis.set("key2", "2");
jedis.set("key3", "2.3");
System.out.println("key1的值："+jedis.get("key1"));
System.out.println("key2的值："+jedis.get("key2"));
System.out.println("key1的值加1："+jedis.incr("key1"));
System.out.println("获取key1的值："+jedis.get("key1"));
System.out.println("key2的值减1："+jedis.decr("key2"));
System.out.println("获取key2的值："+jedis.get("key2"));
System.out.println("将key1的值加上整数5："+jedis.incrBy("key1", 5));
System.out.println("获取key1的值："+jedis.get("key1"));
System.out.println("将key2的值减去整数5："+jedis.decrBy("key2", 5));
System.out.println("获取key2的值："+jedis.get("key2"));
}
- 列表
/***
* 列表
*/
@Test
public void testList() {
jedis.flushDB();
System.out.println("===========添加一个list===========");
jedis.lpush("collections", "ArrayList", "Vector", "Stack", "HashMap", "WeakHashMap", "LinkedHashMap");
jedis.lpush("collections", "HashSet");
jedis.lpush("collections", "TreeSet");
jedis.lpush("collections", "TreeMap");
System.out.println("collections的内容："+jedis.lrange("collections", 0, -1));//-1代表倒数第一个元素，-2代表倒数第二个元素
System.out.println("collections区间0-3的元素："+jedis.lrange("collections",0,3));
System.out.println("===============================");
// 删除列表指定的值 ，第二个参数为删除的个数（有重复时），后add进去的值先被删，类似于出栈
System.out.println("删除指定元素个数："+jedis.lrem("collections", 2, "HashMap"));
System.out.println("collections的内容："+jedis.lrange("collections", 0, -1));
System.out.println("删除下表0-3区间之外的元素："+jedis.ltrim("collections", 0, 3));
System.out.println("collections的内容："+jedis.lrange("collections", 0, -1));
System.out.println("collections列表出栈（左端）："+jedis.lpop("collections"));
System.out.println("collections的内容："+jedis.lrange("collections", 0, -1));
System.out.println("collections添加元素，从列表右端，与lpush相对应："+jedis.rpush("collections", "EnumMap"));
System.out.println("collections的内容："+jedis.lrange("collections", 0, -1));
System.out.println("collections列表出栈（右端）："+jedis.rpop("collections"));
System.out.println("collections的内容："+jedis.lrange("collections", 0, -1));
System.out.println("修改collections指定下标1的内容："+jedis.lset("collections", 1, "LinkedArrayList"));
System.out.println("collections的内容："+jedis.lrange("collections", 0, -1));
System.out.println("===============================");
System.out.println("collections的长度："+jedis.llen("collections"));
System.out.println("获取collections下标为2的元素："+jedis.lindex("collections", 2));
System.out.println("===============================");
jedis.lpush("sortedList", "3","6","2","0","7","4");
System.out.println("sortedList排序前："+jedis.lrange("sortedList", 0, -1));
System.out.println(jedis.sort("sortedList"));
System.out.println("sortedList排序后："+jedis.lrange("sortedList", 0, -1));
}
- set集合
/***
* set集合
*/
@Test
public void testSet() {
jedis.flushDB();
System.out.println("============向集合中添加元素============");
System.out.println(jedis.sadd("eleSet", "e1","e2","e4","e3","e0","e8","e7","e5"));
System.out.println(jedis.sadd("eleSet", "e6"));
System.out.println(jedis.sadd("eleSet", "e6"));
System.out.println("eleSet的所有元素为："+jedis.smembers("eleSet"));
System.out.println("删除一个元素e0："+jedis.srem("eleSet", "e0"));
System.out.println("eleSet的所有元素为："+jedis.smembers("eleSet"));
System.out.println("删除两个元素e7和e6："+jedis.srem("eleSet", "e7","e6"));
System.out.println("eleSet的所有元素为："+jedis.smembers("eleSet"));
System.out.println("随机的移除集合中的一个元素："+jedis.spop("eleSet"));
System.out.println("随机的移除集合中的一个元素："+jedis.spop("eleSet"));
System.out.println("eleSet的所有元素为："+jedis.smembers("eleSet"));
System.out.println("eleSet中包含元素的个数："+jedis.scard("eleSet"));
System.out.println("e3是否在eleSet中："+jedis.sismember("eleSet", "e3"));
System.out.println("e1是否在eleSet中："+jedis.sismember("eleSet", "e1"));
System.out.println("e1是否在eleSet中："+jedis.sismember("eleSet", "e5"));
System.out.println("=================================");
System.out.println(jedis.sadd("eleSet1", "e1","e2","e4","e3","e0","e8","e7","e5"));
System.out.println(jedis.sadd("eleSet2", "e1","e2","e4","e3","e0","e8"));
System.out.println("将eleSet1中删除e1并存入eleSet3中："+jedis.smove("eleSet1", "eleSet3", "e1"));
System.out.println("将eleSet1中删除e2并存入eleSet3中："+jedis.smove("eleSet1", "eleSet3", "e2"));
System.out.println("eleSet1中的元素："+jedis.smembers("eleSet1"));
System.out.println("eleSet3中的元素："+jedis.smembers("eleSet3"));
System.out.println("============集合运算=================");
System.out.println("eleSet1中的元素："+jedis.smembers("eleSet1"));
System.out.println("eleSet2中的元素："+jedis.smembers("eleSet2"));
System.out.println("eleSet1和eleSet2的交集:"+jedis.sinter("eleSet1","eleSet2"));
System.out.println("eleSet1和eleSet2的并集:"+jedis.sunion("eleSet1","eleSet2"));
System.out.println("eleSet1和eleSet2的差集:"+jedis.sdiff("eleSet1","eleSet2"));//eleSet1中有，eleSet2中没有
}
- Hash散列
/***
* 散列
*/
@Test
public void testHash() {
jedis.flushDB();
Map<String,String> map = new HashMap<String,String>();
map.put("key1","value1");
map.put("key2","value2");
map.put("key3","value3");
map.put("key4","value4");
jedis.hmset("hash",map);
jedis.hset("hash", "key5", "value5");
System.out.println("散列hash的所有键值对为："+jedis.hgetAll("hash"));//return Map<String,String>
System.out.println("散列hash的所有键为："+jedis.hkeys("hash"));//return Set<String>
System.out.println("散列hash的所有值为："+jedis.hvals("hash"));//return List<String>
System.out.println("将key6保存的值加上一个整数，如果key6不存在则添加key6："+jedis.hincrBy("hash", "key6", 6));
System.out.println("散列hash的所有键值对为："+jedis.hgetAll("hash"));
System.out.println("将key6保存的值加上一个整数，如果key6不存在则添加key6："+jedis.hincrBy("hash", "key6", 3));
System.out.println("散列hash的所有键值对为："+jedis.hgetAll("hash"));
System.out.println("删除一个或者多个键值对："+jedis.hdel("hash", "key2"));
System.out.println("散列hash的所有键值对为："+jedis.hgetAll("hash"));
System.out.println("散列hash中键值对的个数："+jedis.hlen("hash"));
System.out.println("判断hash中是否存在key2："+jedis.hexists("hash","key2"));
System.out.println("判断hash中是否存在key3："+jedis.hexists("hash","key3"));
System.out.println("获取hash中的值："+jedis.hmget("hash","key3"));
System.out.println("获取hash中的值："+jedis.hmget("hash","key3","key4"));
}
- 有序集合
/**
* 有序集合
*/
@Test
public void testSortedSet() {
jedis.flushDB();
Map<String,Double> map = new HashMap<String,Double>();
map.put("key2",1.2);
map.put("key3",4.0);
map.put("key4",5.0);
map.put("key5",0.2);
System.out.println(jedis.zadd("zset", 3,"key1"));
System.out.println(jedis.zadd("zset",map));
System.out.println("zset中的所有元素："+jedis.zrange("zset", 0, -1));
System.out.println("zset中的所有元素："+jedis.zrangeWithScores("zset", 0, -1));
System.out.println("zset中的所有元素："+jedis.zrangeByScore("zset", 0,100));
System.out.println("zset中的所有元素："+jedis.zrangeByScoreWithScores("zset", 0,100));
System.out.println("zset中key2的分值："+jedis.zscore("zset", "key2"));
System.out.println("zset中key2的排名："+jedis.zrank("zset", "key2"));
System.out.println("删除zset中的元素key3："+jedis.zrem("zset", "key3"));
System.out.println("zset中的所有元素："+jedis.zrange("zset", 0, -1));
System.out.println("zset中元素的个数："+jedis.zcard("zset"));
System.out.println("zset中分值在1-4之间的元素的个数："+jedis.zcount("zset", 1, 4));
System.out.println("key2的分值加上5："+jedis.zincrby("zset", 5, "key2"));
System.out.println("key3的分值加上4："+jedis.zincrby("zset", 4, "key3"));
System.out.println("zset中的所有元素："+jedis.zrange("zset", 0, -1));
}
- 排序
/**
* 排序
*/
@Test
public void testSort()
{
jedis.flushDB();
jedis.lpush("collections", "ArrayList", "Vector", "Stack", "HashMap", "WeakHashMap", "LinkedHashMap");
System.out.println("collections的内容："+jedis.lrange("collections", 0, -1));
SortingParams sortingParameters = new SortingParams();
System.out.println(jedis.sort("collections",sortingParameters.alpha()));
System.out.println("===============================");
jedis.lpush("sortedList", "3","6","2","0","7","4");
System.out.println("sortedList排序前："+jedis.lrange("sortedList", 0, -1));
System.out.println("升序："+jedis.sort("sortedList", sortingParameters.asc()));
System.out.println("升序："+jedis.sort("sortedList", sortingParameters.desc()));
System.out.println("===============================");
jedis.lpush("userlist", "33");
jedis.lpush("userlist", "22");
jedis.lpush("userlist", "55");
jedis.lpush("userlist", "11");
jedis.hset("user:66", "name", "66");
jedis.hset("user:55", "name", "55");
jedis.hset("user:33", "name", "33");
jedis.hset("user:22", "name", "79");
jedis.hset("user:11", "name", "24");
jedis.hset("user:11", "add", "beijing");
jedis.hset("user:22", "add", "shanghai");
jedis.hset("user:33", "add", "guangzhou");
jedis.hset("user:55", "add", "chongqing");
jedis.hset("user:66", "add", "xi'an");
sortingParameters = new SortingParams();
sortingParameters.get("user:*->name");
sortingParameters.get("user:*->add");
System.out.println(jedis.sort("userlist",sortingParameters));
}
完整代码：
package com.binghe.redis;
import org.junit.Test;
import redis.clients.jedis.Jedis;
import redis.clients.jedis.SortingParams;
import java.sql.Timestamp;
import java.text.SimpleDateFormat;
import java.util.*;
import java.util.concurrent.TimeUnit;
/**
* 单机环境Redis操作：一台Redis服务器
*/
public class Standalone {
private static Jedis jedis;
static {
jedis = new Jedis("192.168.175.100", 6379);
jedis.auth("123456"); // 之前我在redis配置中配置了权限密码，这里需要设置
}
/**
* 测试key - value 的数据
* @throws InterruptedException
*/
@Test
public void testKey() throws InterruptedException {
System.out.println("清空数据："+jedis.flushDB());
System.out.println("判断某个键是否存在："+jedis.exists("username"));
System.out.println("新增<'username','wukong'>的键值对："+jedis.set("username", "wukong"));
System.out.println("是否存在:"+jedis.exists("name"));
System.out.println("新增<'password','password'>的键值对："+jedis.set("password", "password"));
Set<String> keys = jedis.keys("*");
System.out.println("系统中所有的键如下："+keys);
System.out.println("删除键password:"+jedis.del("password"));
System.out.println("判断键password是否存在："+jedis.exists("password"));
System.out.println("设置键username的过期时间为5s:"+jedis.expire("username", 5));
TimeUnit.SECONDS.sleep(2);
System.out.println("查看键username的剩余生存时间："+jedis.ttl("username"));
System.out.println("移除键username的生存时间："+jedis.persist("username"));
System.out.println("查看键username的剩余生存时间："+jedis.ttl("username"));
System.out.println("查看键username所存储的值的类型："+jedis.type("username"));
}
/***
* 字符串操作
* memcached和redis同样有append的操作，但是memcached有prepend的操作，redis中并没有。
* @throws InterruptedException
*/
@Test
public void testString() throws InterruptedException {
jedis.flushDB();
System.out.println("===========增加数据===========");
System.out.println(jedis.set("key1","value1"));
System.out.println(jedis.set("key2","value2"));
System.out.println(jedis.set("key3", "value3"));
System.out.println("删除键key2:"+jedis.del("key2"));
System.out.println("获取键key2:"+jedis.get("key2"));
System.out.println("修改key1:"+jedis.set("key1", "value1Changed"));
System.out.println("获取key1的值："+jedis.get("key1"));
System.out.println("在key3后面加入值："+jedis.append("key3", "End"));
System.out.println("key3的值："+jedis.get("key3"));
System.out.println("增加多个键值对："+jedis.mset("key01","value01","key02","value02","key03","value03"));
System.out.println("获取多个键值对："+jedis.mget("key01","key02","key03"));
System.out.println("获取多个键值对："+jedis.mget("key01","key02","key03","key04"));
System.out.println("删除多个键值对："+jedis.del(new String[]{"key01","key02"}));
System.out.println("获取多个键值对："+jedis.mget("key01","key02","key03"));
jedis.flushDB();
System.out.println("===========新增键值对防止覆盖原先值==============");
System.out.println(jedis.setnx("key1", "value1"));
System.out.println(jedis.setnx("key2", "value2"));
System.out.println(jedis.setnx("key2", "value2-new"));
System.out.println(jedis.get("key1"));
System.out.println(jedis.get("key2"));
System.out.println("===========新增键值对并设置有效时间=============");
System.out.println(jedis.setex("key3", 2, "value3"));
System.out.println(jedis.get("key3"));
TimeUnit.SECONDS.sleep(3);
System.out.println(jedis.get("key3"));
System.out.println("===========获取原值，更新为新值==========");//GETSET is an atomic set this value and return the old value command.
System.out.println(jedis.getSet("key2", "key2GetSet"));
System.out.println(jedis.get("key2"));
System.out.println("获得key2的值的字串："+jedis.getrange("key2", 2, 4));
}
/***
* 整数和浮点数
*/
@Test
public void testNumber() {
jedis.flushDB();
jedis.set("key1", "1");
jedis.set("key2", "2");
jedis.set("key3", "2.3");
System.out.println("key1的值："+jedis.get("key1"));
System.out.println("key2的值："+jedis.get("key2"));
System.out.println("key1的值加1："+jedis.incr("key1"));
System.out.println("获取key1的值："+jedis.get("key1"));
System.out.println("key2的值减1："+jedis.decr("key2"));
System.out.println("获取key2的值："+jedis.get("key2"));
System.out.println("将key1的值加上整数5："+jedis.incrBy("key1", 5));
System.out.println("获取key1的值："+jedis.get("key1"));
System.out.println("将key2的值减去整数5："+jedis.decrBy("key2", 5));
System.out.println("获取key2的值："+jedis.get("key2"));
}
/***
* 列表
*/
@Test
public void testList() {
jedis.flushDB();
System.out.println("===========添加一个list===========");
jedis.lpush("collections", "ArrayList", "Vector", "Stack", "HashMap", "WeakHashMap", "LinkedHashMap");
jedis.lpush("collections", "HashSet");
jedis.lpush("collections", "TreeSet");
jedis.lpush("collections", "TreeMap");
System.out.println("collections的内容："+jedis.lrange("collections", 0, -1));//-1代表倒数第一个元素，-2代表倒数第二个元素
System.out.println("collections区间0-3的元素："+jedis.lrange("collections",0,3));
System.out.println("===============================");
// 删除列表指定的值 ，第二个参数为删除的个数（有重复时），后add进去的值先被删，类似于出栈
System.out.println("删除指定元素个数："+jedis.lrem("collections", 2, "HashMap"));
System.out.println("collections的内容："+jedis.lrange("collections", 0, -1));
System.out.println("删除下表0-3区间之外的元素："+jedis.ltrim("collections", 0, 3));
System.out.println("collections的内容："+jedis.lrange("collections", 0, -1));
System.out.println("collections列表出栈（左端）："+jedis.lpop("collections"));
System.out.println("collections的内容："+jedis.lrange("collections", 0, -1));
System.out.println("collections添加元素，从列表右端，与lpush相对应："+jedis.rpush("collections", "EnumMap"));
System.out.println("collections的内容："+jedis.lrange("collections", 0, -1));
System.out.println("collections列表出栈（右端）："+jedis.rpop("collections"));
System.out.println("collections的内容："+jedis.lrange("collections", 0, -1));
System.out.println("修改collections指定下标1的内容："+jedis.lset("collections", 1, "LinkedArrayList"));
System.out.println("collections的内容："+jedis.lrange("collections", 0, -1));
System.out.println("===============================");
System.out.println("collections的长度："+jedis.llen("collections"));
System.out.println("获取collections下标为2的元素："+jedis.lindex("collections", 2));
System.out.println("===============================");
jedis.lpush("sortedList", "3","6","2","0","7","4");
System.out.println("sortedList排序前："+jedis.lrange("sortedList", 0, -1));
System.out.println(jedis.sort("sortedList"));
System.out.println("sortedList排序后："+jedis.lrange("sortedList", 0, -1));
}
/***
* set集合
*/
@Test
public void testSet() {
jedis.flushDB();
System.out.println("============向集合中添加元素============");
System.out.println(jedis.sadd("eleSet", "e1","e2","e4","e3","e0","e8","e7","e5"));
System.out.println(jedis.sadd("eleSet", "e6"));
System.out.println(jedis.sadd("eleSet", "e6"));
System.out.println("eleSet的所有元素为："+jedis.smembers("eleSet"));
System.out.println("删除一个元素e0："+jedis.srem("eleSet", "e0"));
System.out.println("eleSet的所有元素为："+jedis.smembers("eleSet"));
System.out.println("删除两个元素e7和e6："+jedis.srem("eleSet", "e7","e6"));
System.out.println("eleSet的所有元素为："+jedis.smembers("eleSet"));
System.out.println("随机的移除集合中的一个元素："+jedis.spop("eleSet"));
System.out.println("随机的移除集合中的一个元素："+jedis.spop("eleSet"));
System.out.println("eleSet的所有元素为："+jedis.smembers("eleSet"));
System.out.println("eleSet中包含元素的个数："+jedis.scard("eleSet"));
System.out.println("e3是否在eleSet中："+jedis.sismember("eleSet", "e3"));
System.out.println("e1是否在eleSet中："+jedis.sismember("eleSet", "e1"));
System.out.println("e1是否在eleSet中："+jedis.sismember("eleSet", "e5"));
System.out.println("=================================");
System.out.println(jedis.sadd("eleSet1", "e1","e2","e4","e3","e0","e8","e7","e5"));
System.out.println(jedis.sadd("eleSet2", "e1","e2","e4","e3","e0","e8"));
System.out.println("将eleSet1中删除e1并存入eleSet3中："+jedis.smove("eleSet1", "eleSet3", "e1"));
System.out.println("将eleSet1中删除e2并存入eleSet3中："+jedis.smove("eleSet1", "eleSet3", "e2"));
System.out.println("eleSet1中的元素："+jedis.smembers("eleSet1"));
System.out.println("eleSet3中的元素："+jedis.smembers("eleSet3"));
System.out.println("============集合运算=================");
System.out.println("eleSet1中的元素："+jedis.smembers("eleSet1"));
System.out.println("eleSet2中的元素："+jedis.smembers("eleSet2"));
System.out.println("eleSet1和eleSet2的交集:"+jedis.sinter("eleSet1","eleSet2"));
System.out.println("eleSet1和eleSet2的并集:"+jedis.sunion("eleSet1","eleSet2"));
System.out.println("eleSet1和eleSet2的差集:"+jedis.sdiff("eleSet1","eleSet2"));//eleSet1中有，eleSet2中没有
}
/***
* 散列
*/
@Test
public void testHash() {
jedis.flushDB();
Map<String,String> map = new HashMap<String,String>();
map.put("key1","value1");
map.put("key2","value2");
map.put("key3","value3");
map.put("key4","value4");
jedis.hmset("hash",map);
jedis.hset("hash", "key5", "value5");
System.out.println("散列hash的所有键值对为："+jedis.hgetAll("hash"));//return Map<String,String>
System.out.println("散列hash的所有键为："+jedis.hkeys("hash"));//return Set<String>
System.out.println("散列hash的所有值为："+jedis.hvals("hash"));//return List<String>
System.out.println("将key6保存的值加上一个整数，如果key6不存在则添加key6："+jedis.hincrBy("hash", "key6", 6));
System.out.println("散列hash的所有键值对为："+jedis.hgetAll("hash"));
System.out.println("将key6保存的值加上一个整数，如果key6不存在则添加key6："+jedis.hincrBy("hash", "key6", 3));
System.out.println("散列hash的所有键值对为："+jedis.hgetAll("hash"));
System.out.println("删除一个或者多个键值对："+jedis.hdel("hash", "key2"));
System.out.println("散列hash的所有键值对为："+jedis.hgetAll("hash"));
System.out.println("散列hash中键值对的个数："+jedis.hlen("hash"));
System.out.println("判断hash中是否存在key2："+jedis.hexists("hash","key2"));
System.out.println("判断hash中是否存在key3："+jedis.hexists("hash","key3"));
System.out.println("获取hash中的值："+jedis.hmget("hash","key3"));
System.out.println("获取hash中的值："+jedis.hmget("hash","key3","key4"));
}
/**
* 有序集合
*/
@Test
public void testSortedSet() {
jedis.flushDB();
Map<String,Double> map = new HashMap<String,Double>();
map.put("key2",1.2);
map.put("key3",4.0);
map.put("key4",5.0);
map.put("key5",0.2);
System.out.println(jedis.zadd("zset", 3,"key1"));
System.out.println(jedis.zadd("zset",map));
System.out.println("zset中的所有元素："+jedis.zrange("zset", 0, -1));
System.out.println("zset中的所有元素："+jedis.zrangeWithScores("zset", 0, -1));
System.out.println("zset中的所有元素："+jedis.zrangeByScore("zset", 0,100));
System.out.println("zset中的所有元素："+jedis.zrangeByScoreWithScores("zset", 0,100));
System.out.println("zset中key2的分值："+jedis.zscore("zset", "key2"));
System.out.println("zset中key2的排名："+jedis.zrank("zset", "key2"));
System.out.println("删除zset中的元素key3："+jedis.zrem("zset", "key3"));
System.out.println("zset中的所有元素："+jedis.zrange("zset", 0, -1));
System.out.println("zset中元素的个数："+jedis.zcard("zset"));
System.out.println("zset中分值在1-4之间的元素的个数："+jedis.zcount("zset", 1, 4));
System.out.println("key2的分值加上5："+jedis.zincrby("zset", 5, "key2"));
System.out.println("key3的分值加上4："+jedis.zincrby("zset", 4, "key3"));
System.out.println("zset中的所有元素："+jedis.zrange("zset", 0, -1));
}
/**
* 排序
*/
@Test
public void testSort()
{
jedis.flushDB();
jedis.lpush("collections", "ArrayList", "Vector", "Stack", "HashMap", "WeakHashMap", "LinkedHashMap");
System.out.println("collections的内容："+jedis.lrange("collections", 0, -1));
SortingParams sortingParameters = new SortingParams();
System.out.println(jedis.sort("collections",sortingParameters.alpha()));
System.out.println("===============================");
jedis.lpush("sortedList", "3","6","2","0","7","4");
System.out.println("sortedList排序前："+jedis.lrange("sortedList", 0, -1));
System.out.println("升序："+jedis.sort("sortedList", sortingParameters.asc()));
System.out.println("升序："+jedis.sort("sortedList", sortingParameters.desc()));
System.out.println("===============================");
jedis.lpush("userlist", "33");
jedis.lpush("userlist", "22");
jedis.lpush("userlist", "55");
jedis.lpush("userlist", "11");
jedis.hset("user:66", "name", "66");
jedis.hset("user:55", "name", "55");
jedis.hset("user:33", "name", "33");
jedis.hset("user:22", "name", "79");
jedis.hset("user:11", "name", "24");
jedis.hset("user:11", "add", "beijing");
jedis.hset("user:22", "add", "shanghai");
jedis.hset("user:33", "add", "guangzhou");
jedis.hset("user:55", "add", "chongqing");
jedis.hset("user:66", "add", "xi'an");
sortingParameters = new SortingParams();
sortingParameters.get("user:*->name");
sortingParameters.get("user:*->add");
System.out.println(jedis.sort("userlist",sortingParameters));
}
}
JedisCluster的使用
JedisCluster类图和jedis类图大致一样，不过jedisCluster有一些命令是不可用的。比如BinaryJedisCluster类被作废的命令。主要是用在集群中。
接下来，我们给出使用JedisCluster测试Redis五大数据类型的完整源码。
分类代码
- 获取JedisCluster句柄
private static JedisCluster jedis;
static {
// 添加集群的服务节点Set集合
Set<HostAndPort> hostAndPortsSet = new HashSet<HostAndPort>();
// 添加节点
hostAndPortsSet.add(new HostAndPort("192.168.175.100", 7777));
hostAndPortsSet.add(new HostAndPort("192.168.175.100", 8888));
hostAndPortsSet.add(new HostAndPort("192.168.175.101", 7777));
hostAndPortsSet.add(new HostAndPort("192.168.175.101", 8888));
hostAndPortsSet.add(new HostAndPort("192.168.175.102", 7777));
hostAndPortsSet.add(new HostAndPort("192.168.175.102", 8888));
// Jedis连接池配置
JedisPoolConfig jedisPoolConfig = new JedisPoolConfig();
// 最大空闲连接数, 默认8个
jedisPoolConfig.setMaxIdle(100);
// 最大连接数, 默认8个
jedisPoolConfig.setMaxTotal(500);
//最小空闲连接数, 默认0
jedisPoolConfig.setMinIdle(0);
// 获取连接时的最大等待毫秒数(如果设置为阻塞时BlockWhenExhausted),如果超时就抛异常, 小于零:阻塞不确定的时间, 默认-1
jedisPoolConfig.setMaxWaitMillis(2000); // 设置2秒
//对拿到的connection进行validateObject校验
jedisPoolConfig.setTestOnBorrow(true);
jedis = new JedisCluster(hostAndPortsSet, jedisPoolConfig);
}
- key-value数据
/**
* 测试key:value数据
* 集群中flushDB、keys废弃
*/
@Test
public void testKey() throws InterruptedException {
//System.out.println("清空数据："+jedis.flushDB());
System.out.println("判断某个键是否存在："+jedis.exists("username"));
System.out.println("新增<'username','wukong'>的键值对："+jedis.set("username", "xiaohai"));
System.out.println("是否存在:"+jedis.exists("username"));
System.out.println("新增<'password','password'>的键值对："+jedis.set("password", "123456"));
//Set<String> keys = jedis.keys("*");
// System.out.println("系统中所有的键如下："+keys);
System.out.println("删除键password:"+jedis.del("password"));
System.out.println("判断键password是否存在："+jedis.exists("password"));
System.out.println("设置键username的过期时间为10s:"+jedis.expire("username", 10));
TimeUnit.SECONDS.sleep(2); // 线程睡眠2秒System.out.println("查看键username的剩余生存时间："+jedis.ttl("username"));
System.out.println("查看键username的剩余生存时间："+jedis.ttl("username"));
System.out.println("移除键username的生存时间："+jedis.persist("username"));
System.out.println("查看键username的剩余生存时间："+jedis.ttl("username"));
System.out.println("查看键username所存储的值的类型："+jedis.type("username"));
}
- 字符串操作
/***
* 字符串操作
* memcached和redis同样有append的操作，但是memcached有prepend的操作，redis中并没有。
* 集群中flushDB、keys、del(多个值)、mset(多个值)废弃
* @throws InterruptedException
*/
@Test
public void testString() throws InterruptedException {
//jedis.flushDB();
System.out.println("===========增加数据===========");
System.out.println(jedis.set("key1","value1"));
System.out.println(jedis.set("key2","value2"));
System.out.println(jedis.set("key3", "value3"));
System.out.println("删除键key2:"+jedis.del("key2"));
System.out.println("获取键key2:"+jedis.get("key2"));
System.out.println("修改key1:"+jedis.set("key1", "value1Changed"));
System.out.println("获取key1的值："+jedis.get("key1"));
System.out.println("在key3后面加入值："+jedis.append("key3", "End"));
System.out.println("key3的值："+jedis.get("key3"));
//命令的时候才会去连接连接，集群中连接是对一个节点连接，不能判断多个key经过crc16算法所对应的槽在一个节点上，不支持多key获取、删除
//System.out.println("增加多个键值对："+jedis.mset("key01","value01","key02","value02"));
//System.out.println("获取多个键值对："+jedis.mget("key01","key02","key03"));
//System.out.println("获取多个键值对："+jedis.mget("key01","key02","key03","key04"));
//System.out.println("删除多个键值对："+jedis.del(new String[]{"key01","key02"}));
//System.out.println("获取多个键值对："+jedis.mget("key01","key02","key03"));
//jedis.flushDB();
System.out.println("===========新增键值对防止覆盖原先值==============");
System.out.println(jedis.setnx("key1", "value1"));
System.out.println(jedis.setnx("key2", "value2"));
System.out.println(jedis.setnx("key2", "value2-new"));
System.out.println(jedis.get("key1"));
System.out.println(jedis.get("key2"));
System.out.println("===========新增键值对并设置有效时间=============");
System.out.println(jedis.setex("key3", 2, "value3"));
System.out.println(jedis.get("key3"));
TimeUnit.SECONDS.sleep(3);
System.out.println(jedis.get("key3"));
System.out.println("===========获取原值，更新为新值==========");//GETSET is an atomic set this value and return the old value command.
System.out.println(jedis.getSet("key2", "key2GetSet"));
System.out.println(jedis.get("key2"));
System.out.println("获得key2的值的字串："+jedis.getrange("key2", 2, 4)); // 相当截取字符串的第二个位置-第四个位置的字符串
}
- 整数和浮点数
/***
* 整数和浮点数
*/
@Test
public void testNumber() {
jedis.set("key1", "1");
jedis.set("key2", "2");
jedis.set("key3", "2.3");
System.out.println("key1的值："+jedis.get("key1"));
System.out.println("key2的值："+jedis.get("key2"));
System.out.println("key1的值加1："+jedis.incr("key1"));
System.out.println("获取key1的值："+jedis.get("key1"));
System.out.println("key2的值减1："+jedis.decr("key2"));
System.out.println("获取key2的值："+jedis.get("key2"));
System.out.println("将key1的值加上整数5："+jedis.incrBy("key1", 5));
System.out.println("获取key1的值："+jedis.get("key1"));
System.out.println("将key2的值减去整数5："+jedis.decrBy("key2", 5));
System.out.println("获取key2的值："+jedis.get("key2"));
System.out.println("key3的值："+jedis.get("key3"));
// 这里会报错，因为key3不是整数不能做计算:redis.clients.jedis.exceptions.JedisDataException: ERR value is not an integer or out of range
// System.out.println("key2的值减1："+jedis.decr("key3"));
}
- 列表
/***
* 列表
*/
@Test
public void testList() {
System.out.println("===========添加一个list===========");
jedis.lpush("collections", "ArrayList", "Vector", "Stack", "HashMap", "WeakHashMap", "LinkedHashMap");
jedis.lpush("collections", "HashSet"); // 叠加
jedis.lpush("collections", "TreeSet"); // 叠加
jedis.lpush("collections", "TreeMap"); // 叠加
System.out.println("collections的内容："+jedis.lrange("collections", 0, -1));//-1代表倒数第一个元素，-2代表倒数第二个元素
System.out.println("collections区间0-3的元素："+jedis.lrange("collections",0,3)); // 前面4个值
System.out.println("===============================");
// 删除列表指定的值 ，第二个参数为删除的个数（有重复时），后add进去的值先被删，类似于出栈
System.out.println("删除指定元素个数："+jedis.lrem("collections", 2, "HashMap"));
System.out.println("collections的内容："+jedis.lrange("collections", 0, -1));
System.out.println("删除下表0-3区间之外的元素："+jedis.ltrim("collections", 0, 3));
System.out.println("collections的内容："+jedis.lrange("collections", 0, -1));
System.out.println("collections列表出栈（左端）："+jedis.lpop("collections"));
System.out.println("collections的内容："+jedis.lrange("collections", 0, -1));
System.out.println("collections添加元素，从列表右端，与lpush相对应："+jedis.rpush("collections", "EnumMap"));
System.out.println("collections的内容："+jedis.lrange("collections", 0, -1));
System.out.println("collections列表出栈（右端）："+jedis.rpop("collections"));
System.out.println("collections的内容："+jedis.lrange("collections", 0, -1));
System.out.println("修改collections指定下标1的内容："+jedis.lset("collections", 1, "LinkedArrayList"));
System.out.println("collections的内容："+jedis.lrange("collections", 0, -1));
System.out.println("===============================");
System.out.println("collections的长度："+jedis.llen("collections"));
System.out.println("获取collections下标为2的元素："+jedis.lindex("collections", 2));
System.out.println("===============================");
jedis.lpush("sortedList", "3","6","2","0","7","4");
System.out.println("sortedList排序前："+jedis.lrange("sortedList", 0, -1));
System.out.println(jedis.sort("sortedList"));
System.out.println("sortedList排序后："+jedis.lrange("sortedList", 0, -1));
}
- set集合
/***
* set集合
*/
@Test
public void testSet() {
System.out.println("============向集合中添加元素============");
System.out.println(jedis.sadd("eleSet", "e1","e2","e4","e3","e0","e8","e7","e5"));
System.out.println(jedis.sadd("eleSet", "e6"));
System.out.println(jedis.sadd("eleSet", "e6")); // 返回0，集合中已经存在
System.out.println("eleSet的所有元素为："+jedis.smembers("eleSet"));
System.out.println("删除一个元素e0："+jedis.srem("eleSet", "e0"));
System.out.println("eleSet的所有元素为："+jedis.smembers("eleSet"));
System.out.println("删除两个元素e7和e6："+jedis.srem("eleSet", "e7","e6"));
System.out.println("eleSet的所有元素为："+jedis.smembers("eleSet"));
System.out.println("随机的移除集合中的一个元素："+jedis.spop("eleSet"));
System.out.println("随机的移除集合中的一个元素："+jedis.spop("eleSet"));
System.out.println("eleSet的所有元素为："+jedis.smembers("eleSet"));
System.out.println("eleSet中包含元素的个数："+jedis.scard("eleSet"));
System.out.println("e3是否在eleSet中："+jedis.sismember("eleSet", "e3"));
System.out.println("e1是否在eleSet中："+jedis.sismember("eleSet", "e1"));
System.out.println("e5是否在eleSet中："+jedis.sismember("eleSet", "e5"));
// 集群下并存会报错：redis.clients.jedis.exceptions.JedisClusterException: No way to dispatch this command to Redis Cluster because keys have different slots.
// Redis集群，从key1集合与key2集合并存、交集、差集，两个键经过crc16算法可能有不同的槽。
/*System.out.println("=================================");
System.out.println(jedis.sadd("eleSet1", "e1","e2","e4","e3","e0","e8","e7","e5"));
System.out.println(jedis.sadd("eleSet2", "e1","e2","e4","e3","e0","e8"));
System.out.println("将eleSet1中删除e1并存入eleSet3中："+jedis.smove("eleSet1", "eleSet3", "e1"));
System.out.println("将eleSet1中删除e2并存入eleSet3中："+jedis.smove("eleSet1", "eleSet3", "e2"));
System.out.println("eleSet1中的元素："+jedis.smembers("eleSet1"));
System.out.println("eleSet3中的元素："+jedis.smembers("eleSet3"));*/
/*System.out.println("============集合运算=================");
System.out.println("eleSet1中的元素："+jedis.smembers("eleSet1"));
System.out.println("eleSet2中的元素："+jedis.smembers("eleSet2"));
System.out.println("eleSet1和eleSet2的交集:"+jedis.sinter("eleSet1","eleSet2"));
System.out.println("eleSet1和eleSet2的并集:"+jedis.sunion("eleSet1","eleSet2"));
System.out.println("eleSet1和eleSet2的差集:"+jedis.sdiff("eleSet1","eleSet2"));*/
jedis.del("eleSet");
jedis.del("eleSet1");
jedis.del("eleSet2");
jedis.del("eleSet3");
}
- Hash散列
/***
* 散列
*/
@Test
public void testHash() {
Map<String,String> map = new HashMap<String,String>();
map.put("key1","value1");
map.put("key2","value2");
map.put("key3","value3");
map.put("key4","value4");
jedis.hmset("hash",map);
jedis.hset("hash", "key5", "value5");
System.out.println("散列hash的所有键值对为："+jedis.hgetAll("hash"));//return Map<String,String>
System.out.println("散列hash的所有键为："+jedis.hkeys("hash"));//return Set<String>
System.out.println("散列hash的所有值为："+jedis.hvals("hash"));//return List<String>
System.out.println("将key6保存的值加上一个整数，如果key6不存在则添加key6："+jedis.hincrBy("hash", "key6", 6));
System.out.println("散列hash的所有键值对为："+jedis.hgetAll("hash"));
System.out.println("将key6保存的值加上一个整数，如果key6不存在则添加key6："+jedis.hincrBy("hash", "key6", 3));
System.out.println("散列hash的所有键值对为："+jedis.hgetAll("hash"));
System.out.println("删除一个或者多个键值对："+jedis.hdel("hash", "key2"));
System.out.println("散列hash的所有键值对为："+jedis.hgetAll("hash"));
System.out.println("散列hash中键值对的个数："+jedis.hlen("hash"));
System.out.println("判断hash中是否存在key2："+jedis.hexists("hash","key2"));
System.out.println("判断hash中是否存在key3："+jedis.hexists("hash","key3"));
System.out.println("获取hash中的值："+jedis.hmget("hash","key3"));
System.out.println("获取hash中的值："+jedis.hmget("hash","key3","key4"));
}
- 有序集合
/**
* 有序集合
*/
@Test
public void testSortedSet() {
Map<String,Double> map = new HashMap<String,Double>();
map.put("key2",1.2);
map.put("key3",4.0);
map.put("key4",5.0);
map.put("key5",0.2);
// 将一个或多个 member 元素及其 score 值加入到有序集 key 当中，如果某个 member 已经是有序集的成员，那么更新这个 member 的 score 值
// score 值可以是整数值或双精度浮点数
System.out.println(jedis.zadd("zset", 3,"key1"));
System.out.println(jedis.zadd("zset",map));
System.out.println("zset中的所有元素："+jedis.zrange("zset", 0, -1));
System.out.println("zset中的所有元素："+jedis.zrangeWithScores("zset", 0, -1));
System.out.println("zset中的所有元素："+jedis.zrangeByScore("zset", 0,100));
System.out.println("zset中的所有元素："+jedis.zrangeByScoreWithScores("zset", 0,100));
System.out.println("zset中key2的分值："+jedis.zscore("zset", "key2"));
System.out.println("zset中key2的排名："+jedis.zrank("zset", "key2"));
System.out.println("删除zset中的元素key3："+jedis.zrem("zset", "key3"));
System.out.println("zset中的所有元素："+jedis.zrange("zset", 0, -1));
System.out.println("zset中元素的个数："+jedis.zcard("zset"));
System.out.println("zset中分值在1-4之间的元素的个数："+jedis.zcount("zset", 1, 4));
System.out.println("key2的分值加上5："+jedis.zincrby("zset", 5, "key2"));
System.out.println("key3的分值加上4："+jedis.zincrby("zset", 4, "key3"));
System.out.println("zset中的所有元素："+jedis.zrange("zset", 0, -1));
}
- 排序
/**
* 排序
*/
@Test
public void testSort() {
jedis.lpush("collections", "ArrayList", "Vector", "Stack", "HashMap", "WeakHashMap", "LinkedHashMap");
System.out.println("collections的内容："+jedis.lrange("collections", 0, -1));
SortingParams sortingParameters = new SortingParams();
// 当数据集中保存的是字符串值时，你可以用 ALPHA,默认是升序
System.out.println("alpha排序方式：" + jedis.sort("collections",sortingParameters.alpha()));
System.out.println("===============================");
jedis.lpush("sortedList", "3","6","2","0","7","4");
System.out.println("sortedList排序前："+jedis.lrange("sortedList", 0, -1));
System.out.println("升序："+jedis.sort("sortedList", sortingParameters.asc()));
System.out.println("降序："+jedis.sort("sortedList", sortingParameters.desc()));
System.out.println("===============================");
// 集群下不支持分割表排序
/*jedis.lpush("userlist", "33");
jedis.lpush("userlist", "22");
jedis.lpush("userlist", "55");
jedis.lpush("userlist", "11");
jedis.hset("user:66", "name", "66");
jedis.hset("user:55", "name", "55");
jedis.hset("user:33", "name", "33");
jedis.hset("user:22", "name", "79");
jedis.hset("user:11", "name", "24");
jedis.hset("user:11", "add", "beijing");
jedis.hset("user:22", "add", "shanghai");
jedis.hset("user:33", "add", "guangzhou");
jedis.hset("user:55", "add", "chongqing");
jedis.hset("user:66", "add", "xi'an");
sortingParameters = new SortingParams();
// 符号 "->" 用于分割哈希表的键名(key name)和索引域(hash field)，格式为 "key->field"
sortingParameters.get("user:*->name");
sortingParameters.get("user:*->add");
System.out.println(jedis.sort("userlist",sortingParameters));*/
}
完整代码
package com.binghe.redis;
import org.junit.Test;
import redis.clients.jedis.HostAndPort;
import redis.clients.jedis.JedisCluster;
import redis.clients.jedis.JedisPoolConfig;
import redis.clients.jedis.SortingParams;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Map;
import java.util.Set;
import java.util.concurrent.TimeUnit;
/**
* 集群环境下Jedis操作
*/
public class Cluster {
private static JedisCluster jedis;
static {
// 添加集群的服务节点Set集合
Set<HostAndPort> hostAndPortsSet = new HashSet<HostAndPort>();
// 添加节点
hostAndPortsSet.add(new HostAndPort("192.168.175.100", 7777));
hostAndPortsSet.add(new HostAndPort("192.168.175.100", 8888));
hostAndPortsSet.add(new HostAndPort("192.168.175.101", 7777));
hostAndPortsSet.add(new HostAndPort("192.168.175.101", 8888));
hostAndPortsSet.add(new HostAndPort("192.168.175.102", 7777));
hostAndPortsSet.add(new HostAndPort("192.168.175.102", 8888));
// Jedis连接池配置
JedisPoolConfig jedisPoolConfig = new JedisPoolConfig();
// 最大空闲连接数, 默认8个
jedisPoolConfig.setMaxIdle(100);
// 最大连接数, 默认8个
jedisPoolConfig.setMaxTotal(500);
//最小空闲连接数, 默认0
jedisPoolConfig.setMinIdle(0);
// 获取连接时的最大等待毫秒数(如果设置为阻塞时BlockWhenExhausted),如果超时就抛异常, 小于零:阻塞不确定的时间, 默认-1
jedisPoolConfig.setMaxWaitMillis(2000); // 设置2秒
//对拿到的connection进行validateObject校验
jedisPoolConfig.setTestOnBorrow(true);
jedis = new JedisCluster(hostAndPortsSet, jedisPoolConfig);
}
/**
* 测试key:value数据
* 集群中flushDB、keys废弃
*/
@Test
public void testKey() throws InterruptedException {
//System.out.println("清空数据："+jedis.flushDB());
System.out.println("判断某个键是否存在："+jedis.exists("username"));
System.out.println("新增<'username','wukong'>的键值对："+jedis.set("username", "xiaohai"));
System.out.println("是否存在:"+jedis.exists("username"));
System.out.println("新增<'password','password'>的键值对："+jedis.set("password", "123456"));
//Set<String> keys = jedis.keys("*");
// System.out.println("系统中所有的键如下："+keys);
System.out.println("删除键password:"+jedis.del("password"));
System.out.println("判断键password是否存在："+jedis.exists("password"));
System.out.println("设置键username的过期时间为10s:"+jedis.expire("username", 10));
TimeUnit.SECONDS.sleep(2); // 线程睡眠2秒System.out.println("查看键username的剩余生存时间："+jedis.ttl("username"));
System.out.println("查看键username的剩余生存时间："+jedis.ttl("username"));
System.out.println("移除键username的生存时间："+jedis.persist("username"));
System.out.println("查看键username的剩余生存时间："+jedis.ttl("username"));
System.out.println("查看键username所存储的值的类型："+jedis.type("username"));
}
/***
* 字符串操作
* memcached和redis同样有append的操作，但是memcached有prepend的操作，redis中并没有。
* 集群中flushDB、keys、del(多个值)、mset(多个值)废弃
* @throws InterruptedException
*/
@Test
public void testString() throws InterruptedException {
//jedis.flushDB();
System.out.println("===========增加数据===========");
System.out.println(jedis.set("key1","value1"));
System.out.println(jedis.set("key2","value2"));
System.out.println(jedis.set("key3", "value3"));
System.out.println("删除键key2:"+jedis.del("key2"));
System.out.println("获取键key2:"+jedis.get("key2"));
System.out.println("修改key1:"+jedis.set("key1", "value1Changed"));
System.out.println("获取key1的值："+jedis.get("key1"));
System.out.println("在key3后面加入值："+jedis.append("key3", "End"));
System.out.println("key3的值："+jedis.get("key3"));
//命令的时候才会去连接连接，集群中连接是对一个节点连接，不能判断多个key经过crc16算法所对应的槽在一个节点上，不支持多key获取、删除
//System.out.println("增加多个键值对："+jedis.mset("key01","value01","key02","value02"));
//System.out.println("获取多个键值对："+jedis.mget("key01","key02","key03"));
//System.out.println("获取多个键值对："+jedis.mget("key01","key02","key03","key04"));
//System.out.println("删除多个键值对："+jedis.del(new String[]{"key01","key02"}));
//System.out.println("获取多个键值对："+jedis.mget("key01","key02","key03"));
//jedis.flushDB();
System.out.println("===========新增键值对防止覆盖原先值==============");
System.out.println(jedis.setnx("key1", "value1"));
System.out.println(jedis.setnx("key2", "value2"));
System.out.println(jedis.setnx("key2", "value2-new"));
System.out.println(jedis.get("key1"));
System.out.println(jedis.get("key2"));
System.out.println("===========新增键值对并设置有效时间=============");
System.out.println(jedis.setex("key3", 2, "value3"));
System.out.println(jedis.get("key3"));
TimeUnit.SECONDS.sleep(3);
System.out.println(jedis.get("key3"));
System.out.println("===========获取原值，更新为新值==========");//GETSET is an atomic set this value and return the old value command.
System.out.println(jedis.getSet("key2", "key2GetSet"));
System.out.println(jedis.get("key2"));
System.out.println("获得key2的值的字串："+jedis.getrange("key2", 2, 4)); // 相当截取字符串的第二个位置-第四个位置的字符串
}
/***
* 整数和浮点数
*/
@Test
public void testNumber() {
jedis.set("key1", "1");
jedis.set("key2", "2");
jedis.set("key3", "2.3");
System.out.println("key1的值："+jedis.get("key1"));
System.out.println("key2的值："+jedis.get("key2"));
System.out.println("key1的值加1："+jedis.incr("key1"));
System.out.println("获取key1的值："+jedis.get("key1"));
System.out.println("key2的值减1："+jedis.decr("key2"));
System.out.println("获取key2的值："+jedis.get("key2"));
System.out.println("将key1的值加上整数5："+jedis.incrBy("key1", 5));
System.out.println("获取key1的值："+jedis.get("key1"));
System.out.println("将key2的值减去整数5："+jedis.decrBy("key2", 5));
System.out.println("获取key2的值："+jedis.get("key2"));
System.out.println("key3的值："+jedis.get("key3"));
// 这里会报错，因为key3不是整数不能做计算:redis.clients.jedis.exceptions.JedisDataException: ERR value is not an integer or out of range
// System.out.println("key2的值减1："+jedis.decr("key3"));
}
/***
* 列表
*/
@Test
public void testList() {
System.out.println("===========添加一个list===========");
jedis.lpush("collections", "ArrayList", "Vector", "Stack", "HashMap", "WeakHashMap", "LinkedHashMap");
jedis.lpush("collections", "HashSet"); // 叠加
jedis.lpush("collections", "TreeSet"); // 叠加
jedis.lpush("collections", "TreeMap"); // 叠加
System.out.println("collections的内容："+jedis.lrange("collections", 0, -1));//-1代表倒数第一个元素，-2代表倒数第二个元素
System.out.println("collections区间0-3的元素："+jedis.lrange("collections",0,3)); // 前面4个值
System.out.println("===============================");
// 删除列表指定的值 ，第二个参数为删除的个数（有重复时），后add进去的值先被删，类似于出栈
System.out.println("删除指定元素个数："+jedis.lrem("collections", 2, "HashMap"));
System.out.println("collections的内容："+jedis.lrange("collections", 0, -1));
System.out.println("删除下表0-3区间之外的元素："+jedis.ltrim("collections", 0, 3));
System.out.println("collections的内容："+jedis.lrange("collections", 0, -1));
System.out.println("collections列表出栈（左端）："+jedis.lpop("collections"));
System.out.println("collections的内容："+jedis.lrange("collections", 0, -1));
System.out.println("collections添加元素，从列表右端，与lpush相对应："+jedis.rpush("collections", "EnumMap"));
System.out.println("collections的内容："+jedis.lrange("collections", 0, -1));
System.out.println("collections列表出栈（右端）："+jedis.rpop("collections"));
System.out.println("collections的内容："+jedis.lrange("collections", 0, -1));
System.out.println("修改collections指定下标1的内容："+jedis.lset("collections", 1, "LinkedArrayList"));
System.out.println("collections的内容："+jedis.lrange("collections", 0, -1));
System.out.println("===============================");
System.out.println("collections的长度："+jedis.llen("collections"));
System.out.println("获取collections下标为2的元素："+jedis.lindex("collections", 2));
System.out.println("===============================");
jedis.lpush("sortedList", "3","6","2","0","7","4");
System.out.println("sortedList排序前："+jedis.lrange("sortedList", 0, -1));
System.out.println(jedis.sort("sortedList"));
System.out.println("sortedList排序后："+jedis.lrange("sortedList", 0, -1));
}
/***
* set集合
*/
@Test
public void testSet() {
System.out.println("============向集合中添加元素============");
System.out.println(jedis.sadd("eleSet", "e1","e2","e4","e3","e0","e8","e7","e5"));
System.out.println(jedis.sadd("eleSet", "e6"));
System.out.println(jedis.sadd("eleSet", "e6")); // 返回0，集合中已经存在
System.out.println("eleSet的所有元素为："+jedis.smembers("eleSet"));
System.out.println("删除一个元素e0："+jedis.srem("eleSet", "e0"));
System.out.println("eleSet的所有元素为："+jedis.smembers("eleSet"));
System.out.println("删除两个元素e7和e6："+jedis.srem("eleSet", "e7","e6"));
System.out.println("eleSet的所有元素为："+jedis.smembers("eleSet"));
System.out.println("随机的移除集合中的一个元素："+jedis.spop("eleSet"));
System.out.println("随机的移除集合中的一个元素："+jedis.spop("eleSet"));
System.out.println("eleSet的所有元素为："+jedis.smembers("eleSet"));
System.out.println("eleSet中包含元素的个数："+jedis.scard("eleSet"));
System.out.println("e3是否在eleSet中："+jedis.sismember("eleSet", "e3"));
System.out.println("e1是否在eleSet中："+jedis.sismember("eleSet", "e1"));
System.out.println("e5是否在eleSet中："+jedis.sismember("eleSet", "e5"));
// 集群下并存会报错：redis.clients.jedis.exceptions.JedisClusterException: No way to dispatch this command to Redis Cluster because keys have different slots.
// Redis集群，从key1集合与key2集合并存、交集、差集，两个键经过crc16算法可能有不同的槽。
/*System.out.println("=================================");
System.out.println(jedis.sadd("eleSet1", "e1","e2","e4","e3","e0","e8","e7","e5"));
System.out.println(jedis.sadd("eleSet2", "e1","e2","e4","e3","e0","e8"));
System.out.println("将eleSet1中删除e1并存入eleSet3中："+jedis.smove("eleSet1", "eleSet3", "e1"));
System.out.println("将eleSet1中删除e2并存入eleSet3中："+jedis.smove("eleSet1", "eleSet3", "e2"));
System.out.println("eleSet1中的元素："+jedis.smembers("eleSet1"));
System.out.println("eleSet3中的元素："+jedis.smembers("eleSet3"));*/
/*System.out.println("============集合运算=================");
System.out.println("eleSet1中的元素："+jedis.smembers("eleSet1"));
System.out.println("eleSet2中的元素："+jedis.smembers("eleSet2"));
System.out.println("eleSet1和eleSet2的交集:"+jedis.sinter("eleSet1","eleSet2"));
System.out.println("eleSet1和eleSet2的并集:"+jedis.sunion("eleSet1","eleSet2"));
System.out.println("eleSet1和eleSet2的差集:"+jedis.sdiff("eleSet1","eleSet2"));*/
jedis.del("eleSet");
jedis.del("eleSet1");
jedis.del("eleSet2");
jedis.del("eleSet3");
}
/***
* 散列
*/
@Test
public void testHash() {
Map<String,String> map = new HashMap<String,String>();
map.put("key1","value1");
map.put("key2","value2");
map.put("key3","value3");
map.put("key4","value4");
jedis.hmset("hash",map);
jedis.hset("hash", "key5", "value5");
System.out.println("散列hash的所有键值对为："+jedis.hgetAll("hash"));//return Map<String,String>
System.out.println("散列hash的所有键为："+jedis.hkeys("hash"));//return Set<String>
System.out.println("散列hash的所有值为："+jedis.hvals("hash"));//return List<String>
System.out.println("将key6保存的值加上一个整数，如果key6不存在则添加key6："+jedis.hincrBy("hash", "key6", 6));
System.out.println("散列hash的所有键值对为："+jedis.hgetAll("hash"));
System.out.println("将key6保存的值加上一个整数，如果key6不存在则添加key6："+jedis.hincrBy("hash", "key6", 3));
System.out.println("散列hash的所有键值对为："+jedis.hgetAll("hash"));
System.out.println("删除一个或者多个键值对："+jedis.hdel("hash", "key2"));
System.out.println("散列hash的所有键值对为："+jedis.hgetAll("hash"));
System.out.println("散列hash中键值对的个数："+jedis.hlen("hash"));
System.out.println("判断hash中是否存在key2："+jedis.hexists("hash","key2"));
System.out.println("判断hash中是否存在key3："+jedis.hexists("hash","key3"));
System.out.println("获取hash中的值："+jedis.hmget("hash","key3"));
System.out.println("获取hash中的值："+jedis.hmget("hash","key3","key4"));
}
/**
* 有序集合
*/
@Test
public void testSortedSet() {
Map<String,Double> map = new HashMap<String,Double>();
map.put("key2",1.2);
map.put("key3",4.0);
map.put("key4",5.0);
map.put("key5",0.2);
// 将一个或多个 member 元素及其 score 值加入到有序集 key 当中，如果某个 member 已经是有序集的成员，那么更新这个 member 的 score 值
// score 值可以是整数值或双精度浮点数
System.out.println(jedis.zadd("zset", 3,"key1"));
System.out.println(jedis.zadd("zset",map));
System.out.println("zset中的所有元素："+jedis.zrange("zset", 0, -1));
System.out.println("zset中的所有元素："+jedis.zrangeWithScores("zset", 0, -1));
System.out.println("zset中的所有元素："+jedis.zrangeByScore("zset", 0,100));
System.out.println("zset中的所有元素："+jedis.zrangeByScoreWithScores("zset", 0,100));
System.out.println("zset中key2的分值："+jedis.zscore("zset", "key2"));
System.out.println("zset中key2的排名："+jedis.zrank("zset", "key2"));
System.out.println("删除zset中的元素key3："+jedis.zrem("zset", "key3"));
System.out.println("zset中的所有元素："+jedis.zrange("zset", 0, -1));
System.out.println("zset中元素的个数："+jedis.zcard("zset"));
System.out.println("zset中分值在1-4之间的元素的个数："+jedis.zcount("zset", 1, 4));
System.out.println("key2的分值加上5："+jedis.zincrby("zset", 5, "key2"));
System.out.println("key3的分值加上4："+jedis.zincrby("zset", 4, "key3"));
System.out.println("zset中的所有元素："+jedis.zrange("zset", 0, -1));
}
/**
* 排序
*/
@Test
public void testSort() {
jedis.lpush("collections", "ArrayList", "Vector", "Stack", "HashMap", "WeakHashMap", "LinkedHashMap");
System.out.println("collections的内容："+jedis.lrange("collections", 0, -1));
SortingParams sortingParameters = new SortingParams();
// 当数据集中保存的是字符串值时，你可以用 ALPHA,默认是升序
System.out.println("alpha排序方式：" + jedis.sort("collections",sortingParameters.alpha()));
System.out.println("===============================");
jedis.lpush("sortedList", "3","6","2","0","7","4");
System.out.println("sortedList排序前："+jedis.lrange("sortedList", 0, -1));
System.out.println("升序："+jedis.sort("sortedList", sortingParameters.asc()));
System.out.println("降序："+jedis.sort("sortedList", sortingParameters.desc()));
System.out.println("===============================");
// 集群下不支持分割表排序
/*jedis.lpush("userlist", "33");
jedis.lpush("userlist", "22");
jedis.lpush("userlist", "55");
jedis.lpush("userlist", "11");
jedis.hset("user:66", "name", "66");
jedis.hset("user:55", "name", "55");
jedis.hset("user:33", "name", "33");
jedis.hset("user:22", "name", "79");
jedis.hset("user:11", "name", "24");
jedis.hset("user:11", "add", "beijing");
jedis.hset("user:22", "add", "shanghai");
jedis.hset("user:33", "add", "guangzhou");
jedis.hset("user:55", "add", "chongqing");
jedis.hset("user:66", "add", "xi'an");
sortingParameters = new SortingParams();
// 符号 "->" 用于分割哈希表的键名(key name)和索引域(hash field)，格式为 "key->field"
sortingParameters.get("user:*->name");
sortingParameters.get("user:*->add");
System.out.println(jedis.sort("userlist",sortingParameters));*/
}
}
小伙伴们记得点赞、收藏、评论、分享呀~~
好了，今天就到这儿吧，我是冰河，大家有啥问题可以在下方留言，一起交流技术，一起进阶，一起进大厂~~
标签：key2,数据类型,Redis,System,jedis,超强,println,collections,out 来源： https://blog.csdn.net/l1028386804/article/details/116942916