HBase2.4.8详细教程（三）Java操作HBase
作者：互联网
在idea中建立Maven Java项目。
在pom.xml中引入对应版本的HBase依赖：
<dependencies>
<!-- https://mvnrepository.com/artifact/org.apache.hbase/hbase-client -->
<dependency>
<groupId>org.apache.hbase</groupId>
<artifactId>hbase-client</artifactId>
<version>2.4.8</version>
</dependency>
<!-- https://mvnrepository.com/artifact/org.apache.hbase/hbase -->
<dependency>
<groupId>org.apache.hbase</groupId>
<artifactId>hbase</artifactId>
<version>2.4.8</version>
<type>pom</type>
</dependency>
</dependencies>
Java代码，详见代码及注释即可。
package com.alan;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.hbase.*;
import org.apache.hadoop.hbase.client.*;
import org.apache.hadoop.hbase.util.Bytes;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
public class TestHBase {
private static Configuration conf = HBaseConfiguration.create();
private static Admin admin;
private static Connection connection = null;
static {
//HBase Master地址，在hbase-site.xml中配置
conf.set("hbase.rootdir", "hdfs://hp301:9000/hbase");
//ZooKeeper三个服务器地址
conf.set("hbase.zookeeper.quorum", "hp301,hp302,hp303");
try {
connection = ConnectionFactory.createConnection(conf);
admin = connection.getAdmin();
} catch (IOException e) {
e.printStackTrace();
}
}
public static void main(String[] args) throws IOException {
TestHBase test = new TestHBase();
// test.createTable("java_test");//建表
//test.createTable2("java_test","f1","f2");//建表（制定行键）
//test.addData("java_test");//插入数据
//test.insertBatchData("test");//插入多个数据
//test.getData("java_test");//通过Get查找单行数据,注意列值的类型
test.scanAllData("java_test");//通过Scan方法扫描全表
// test.deleteData("java_test");//删除表数据
//test.deleteTable("java_test");//删除表
admin.close();
connection.close();
}
public void createTable2(String tableName, String... columnFamily) {
TableName tableNameObj = TableName.valueOf(tableName);
try {
if (admin.tableExists(tableNameObj)) {
System.out.println("Table: " + tableName + " already exists!");
} else {
HTableDescriptor tb = new HTableDescriptor(tableNameObj);
for (int i = 0; i < columnFamily.length; i++) {
HColumnDescriptor family = new HColumnDescriptor(columnFamily[i]);
tb.addFamily(family);
}
admin.createTable(tb);
System.out.println(tableName + "创建表成功");
}
} catch (IOException e) {
e.printStackTrace();
System.out.println(tableName + "创建表失败");
}
}
public void createTable(String tableName) throws IOException {
//通过管理员对象创建表
HTableDescriptor hTableDescriptor = new HTableDescriptor(TableName.valueOf(tableName));
//给表添加列族
HColumnDescriptor f1 = new HColumnDescriptor("f1");
HColumnDescriptor f2 = new HColumnDescriptor("f2");
//将两个列族设置到 创建的表中
hTableDescriptor.addFamily(f1);
hTableDescriptor.addFamily(f2);
//创建表
admin.createTable(hTableDescriptor);
//关闭连接
admin.close();
connection.close();
System.out.println("创建表成功");
}
public void addData(String tableName) throws IOException {
//获取表对象
Table myuser = connection.getTable(TableName.valueOf(tableName));
Put put = new Put("0001".getBytes());
put.addColumn("f1".getBytes(), "id".getBytes(), Bytes.toBytes(1));
put.addColumn("f1".getBytes(), "name".getBytes(), Bytes.toBytes("小明"));
put.addColumn("f1".getBytes(), "age".getBytes(), Bytes.toBytes(22));
put.addColumn("f2".getBytes(), "sex".getBytes(), Bytes.toBytes("男"));
put.addColumn("f2".getBytes(), "address".getBytes(), Bytes.toBytes("青岛"));
put.addColumn("f2".getBytes(), "phone".getBytes(), Bytes.toBytes("15900000001"));
put.addColumn("f2".getBytes(), "say".getBytes(), Bytes.toBytes("你好"));
myuser.put(put);
//关闭表
myuser.close();
System.out.println("插入数据成功");
}
public void insertBatchData(String tableName) throws IOException {
//获取表
Table myuser = connection.getTable(TableName.valueOf(tableName));
//创建put对象，并指定rowkey
Put put = new Put("0002".getBytes());
put.addColumn("f1".getBytes(), "id".getBytes(), Bytes.toBytes(1));
put.addColumn("f1".getBytes(), "name".getBytes(), Bytes.toBytes("小红"));
put.addColumn("f1".getBytes(), "age".getBytes(), Bytes.toBytes(21));
put.addColumn("f2".getBytes(), "sex".getBytes(), Bytes.toBytes("女"));
put.addColumn("f2".getBytes(), "address".getBytes(), Bytes.toBytes("济南"));
put.addColumn("f2".getBytes(), "phone".getBytes(), Bytes.toBytes("15900000002"));
put.addColumn("f2".getBytes(), "say".getBytes(), Bytes.toBytes("Hello！"));
Put put2 = new Put("0003".getBytes());
put2.addColumn("f1".getBytes(), "id".getBytes(), Bytes.toBytes(2));
put2.addColumn("f1".getBytes(), "name".getBytes(), Bytes.toBytes("小强"));
put2.addColumn("f1".getBytes(), "age".getBytes(), Bytes.toBytes(22));
put2.addColumn("f2".getBytes(), "sex".getBytes(), Bytes.toBytes("男"));
put2.addColumn("f2".getBytes(), "address".getBytes(), Bytes.toBytes("北京"));
put2.addColumn("f2".getBytes(), "phone".getBytes(), Bytes.toBytes("15900000003"));
put2.addColumn("f2".getBytes(), "say".getBytes(), Bytes.toBytes("俺北京……"));
Put put3 = new Put("0004".getBytes());
put3.addColumn("f1".getBytes(), "id".getBytes(), Bytes.toBytes(4));
put3.addColumn("f1".getBytes(), "name".getBytes(), Bytes.toBytes("小花"));
put3.addColumn("f1".getBytes(), "age".getBytes(), Bytes.toBytes(23));
put3.addColumn("f2".getBytes(), "sex".getBytes(), Bytes.toBytes("女"));
put3.addColumn("f2".getBytes(), "address".getBytes(), Bytes.toBytes("重庆"));
put3.addColumn("f2".getBytes(), "phone".getBytes(), Bytes.toBytes("15900000004"));
put3.addColumn("f2".getBytes(), "say".getBytes(), Bytes.toBytes("要得"));
Put put4 = new Put("0005".getBytes());
put4.addColumn("f1".getBytes(), "id".getBytes(), Bytes.toBytes(5));
put4.addColumn("f1".getBytes(), "name".getBytes(), Bytes.toBytes("小杰"));
put4.addColumn("f1".getBytes(), "age".getBytes(), Bytes.toBytes(24));
put4.addColumn("f2".getBytes(), "sex".getBytes(), Bytes.toBytes("男"));
put4.addColumn("f2".getBytes(), "address".getBytes(), Bytes.toBytes("上海"));
put4.addColumn("f2".getBytes(), "phone".getBytes(), Bytes.toBytes("15900000005"));
put4.addColumn("f2".getBytes(), "say".getBytes(), Bytes.toBytes("阿拉桑海人"));
Put put5 = new Put("0006".getBytes());
put5.addColumn("f1".getBytes(), "id".getBytes(), Bytes.toBytes(6));
put5.addColumn("f1".getBytes(), "name".getBytes(), Bytes.toBytes("小雨"));
put5.addColumn("f1".getBytes(), "age".getBytes(), Bytes.toBytes(22));
put5.addColumn("f2".getBytes(), "sex".getBytes(), Bytes.toBytes("女"));
put5.addColumn("f2".getBytes(), "address".getBytes(), Bytes.toBytes("广东"));
put5.addColumn("f2".getBytes(), "phone".getBytes(), Bytes.toBytes("15900000006"));
put5.addColumn("f2".getBytes(), "say".getBytes(), Bytes.toBytes("洒洒水"));
Put put6 = new Put("0007".getBytes());
put6.addColumn("f1".getBytes(), "id".getBytes(), Bytes.toBytes(7));
put6.addColumn("f1".getBytes(), "name".getBytes(), Bytes.toBytes("小瓜"));
put6.addColumn("f1".getBytes(), "age".getBytes(), Bytes.toBytes(22));
put6.addColumn("f2".getBytes(), "sex".getBytes(), Bytes.toBytes("男"));
put6.addColumn("f2".getBytes(), "address".getBytes(), Bytes.toBytes("江苏"));
put6.addColumn("f2".getBytes(), "phone".getBytes(), Bytes.toBytes("15900000007"));
put6.addColumn("f2".getBytes(), "say".getBytes(), Bytes.toBytes("我是苏南的"));
List<Put> listPut = new ArrayList<Put>();
listPut.add(put);
listPut.add(put2);
listPut.add(put3);
listPut.add(put4);
listPut.add(put5);
listPut.add(put6);
myuser.put(listPut);
myuser.close();
System.out.println("插入多个数据成功");
}
public void getData(String tableName) throws IOException {
//获取表对象
Table myuser = connection.getTable(TableName.valueOf(tableName));
Get get = new Get("0005".getBytes());
get.addColumn("f2".getBytes(), "address".getBytes());//列族；列名
//获取返回结果
Result result = myuser.get(get);
List<Cell> cells = result.listCells();
for (Cell cell : cells) {
//获取列族的名称
String familyName = Bytes.toString(cell.getFamilyArray(), cell.getFamilyOffset(), cell.getFamilyLength());
//获取列的名称
String columnName = Bytes.toString(cell.getQualifierArray(), cell.getQualifierOffset(), cell.getQualifierLength());
if (familyName.equals("f1") && columnName.equals("id") || columnName.equals("age")) {
int value = Bytes.toInt(cell.getValueArray(), cell.getValueOffset(), cell.getValueLength());
System.out.println("列族名： " + familyName + " ,列名： " + columnName + " ,列值：" + value);
} else {
String value = Bytes.toString(cell.getValueArray(), cell.getValueOffset(), cell.getValueLength());
System.out.println("列族名： " + familyName + " ,列名： " + columnName + " ,列值：" + value);
}
}
//关闭表
myuser.close();
}
public void scanAllData(String tableName) throws IOException {
//获取表对象
Table myuser = connection.getTable(TableName.valueOf(tableName));
Scan scan = new Scan();
//设置起始和结束的rowkey,扫描结果是：[)类型
scan.setStartRow("0001".getBytes());
scan.setStopRow("0008".getBytes());
ResultScanner scanner = myuser.getScanner(scan);
for (Result result : scanner) {
List<Cell> cells = result.listCells();
for (Cell cell : cells) {
String rowkey = Bytes.toString(cell.getRowArray(), cell.getRowOffset(), cell.getRowLength());
//获取列族的名称
String familyName = Bytes.toString(cell.getFamilyArray(), cell.getFamilyOffset(), cell.getFamilyLength());
//获取列的名称
String columnName = Bytes.toString(cell.getQualifierArray(), cell.getQualifierOffset(), cell.getQualifierLength());
if (familyName.equals("f1") && columnName.equals("id") || columnName.equals("age")) {
int value = Bytes.toInt(cell.getValueArray(), cell.getValueOffset(), cell.getValueLength());
System.out.println("列族名： " + familyName + " ,列名： " + columnName + " ,列值：" + value);
} else {
String value = Bytes.toString(cell.getValueArray(), cell.getValueOffset(), cell.getValueLength());
System.out.println("列族名： " + familyName + " ,列名： " + columnName + " ,列值：" + value);
}
}
}
//获取返回结果
myuser.close();
}
public void deleteData(String talbeName) throws IOException {
//获取表对象
Table myuser = connection.getTable(TableName.valueOf(talbeName));
Delete delete = new Delete("0001".getBytes());
myuser.delete(delete);
myuser.close();
System.out.println("删除成功");
}
public void deleteTable(String tableName) throws IOException {
//获取管理员对象
Admin admin = connection.getAdmin();
//禁用表
admin.disableTable(TableName.valueOf(tableName));
//删除表
admin.deleteTable(TableName.valueOf(tableName));
System.out.println("删除表成功");
}
}
运行查询代码，控制台中输出：
标签：f2,Java,Bytes,getBytes,cell,HBase2.4,toBytes,HBase,addColumn 来源： https://blog.csdn.net/GodBlessYouAndMe/article/details/121923142