大数据之路Week10_day01 (练习：通过设计rowkey来实现查询需求）

1、准备数据

链接：https://pan.baidu.com/s/1fRECXp0oWM1xgxc0uoniAA
提取码：4k43 

2、需求如下

　　（1）查询出10条某个人的最近出现的位置信息

　　（2）查询出某个人在某一天在某个城市的所有位置信息

3、设计rowkey

　　手机号_（某一个大值 - 进入位置的开始时间）

　　因为Hbase的rowkey是以字典顺序来排序的，如果我们就直接将其存进去，是升序的，而要求是最新的位置信息，那么肯定是倒序的。

4、编写连接、创建表、插入数据、查询数据的代码

package com.wyh.parctise;

import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.hbase.Cell;
import org.apache.hadoop.hbase.CellUtil;
import org.apache.hadoop.hbase.HColumnDescriptor;
import org.apache.hadoop.hbase.HTableDescriptor;
import org.apache.hadoop.hbase.client.*;
import org.apache.hadoop.hbase.filter.*;
import org.apache.hadoop.hbase.util.Bytes;
import org.junit.After;
import org.junit.Before;
import org.junit.Test;

import java.io.BufferedReader;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;

public class dianxin_Demo1 {
    Configuration conf;
    HConnection conn;
    HBaseAdmin hBaseAdmin;

    @Before
    public void Cline(){
        try {
            conf = new Configuration();
            conf.set("hbase.zookeeper.quorum","master:2181,node1:2181,node2:2181");
            conn = HConnectionManager.createConnection(conf);
            hBaseAdmin = new HBaseAdmin(conf);
            System.out.println("建立连接成功。。"+conn);
        } catch (IOException e) {
            e.printStackTrace();
        }
    }


    /**
     * 创建表
     */
    @Test
    public void createTable(){
        try {
            //创建表
            HTableDescriptor dianxin_1 = new HTableDescriptor("dianxin_1");
            //设置表的列簇
            HColumnDescriptor info = new HColumnDescriptor("info");

            //将列簇加入到
            dianxin_1.addFamily(info);
            //通过Hmaster的对象进行创建表
            hBaseAdmin.createTable(dianxin_1);

            System.out.println(Bytes.toString(dianxin_1.getName())+"表 创建完毕。。");
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    /**
     * 往表中批量的插入数据
     */
    @Test
    public void putAllData(){
        //定义一个ArrayList集合存Put实例
        ArrayList<Put> puts = new ArrayList<>();
        try {
            //获取到表的实例
            HTableInterface dianxin_1 = conn.getTable("dianxin_1");
            //读取文件信息
            BufferedReader br = new BufferedReader(new FileReader("D:\\shujia\\shujia006\\hadoop\\src\\data\\dianxin_data"));
            String line;
            while ((line=br.readLine())!=null){
                //使用字符串的分割方法将其一行数据进行分割
                String[] split = line.split(",");
                if(!"\\N".equals(split[5])){
                    Long l = 20200000000000L-Long.parseLong(split[5]);
                    String startTime = String.valueOf(l);

                    //将开始位置和手机号拼接作为rowkey
                    String rowkey = split[0]+"_"+startTime;

                    String wg = split[1];
                    String cityID = split[2];
                    String qxID = split[3];
                    String stayTime = split[4];
                    String leaveTime = split[6];
                    String day = split[7];


                    //创建一个Put实例，将rowkey作为rowkey
                    Put put = new Put(rowkey.getBytes());

                    //将其他的字段作为列值加入
                    put.add("info".getBytes(),"wg".getBytes(),wg.getBytes());
                    put.add("info".getBytes(),"cityID".getBytes(),cityID.getBytes());
                    put.add("info".getBytes(),"qxID".getBytes(),qxID.getBytes());
                    put.add("info".getBytes(),"stayTime".getBytes(),stayTime.getBytes());
                    put.add("info".getBytes(),"leaveTime".getBytes(),leaveTime.getBytes());
                    put.add("info".getBytes(),"day".getBytes(),day.getBytes());

                    //将这个Put加入到puts集合中去
                    puts.add(put);
                }

            }

            //将这个Put集合进行添加
            dianxin_1.put(puts);
            System.out.println(br.getClass().getName()+"文件数据加载完毕。。。");

            //关闭输入流
            br.close();
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }

    }


    /**
     * 读取一条数据
     */
    @Test
    public void getData(){
        try {
            //获取到表的实例
            HTableInterface dianxin_1 = conn.getTable("dianxin_1");
            //创建get实例 提供一个行键
            Long i = 20200000000000L - 20180503190539L;
            String s1 = "D55433A437AEC8D8D3DB2BCA56E9E64392A9D93C_"+i;
            Get get = new Get(s1.getBytes());

            //通过调用get()方法来过去数据
            Result result = dianxin_1.get(get);

            /**
             * 第一种方式，已知列
             */
            //调用getrow获取二进制数组结果，再用Bytes工具类的toString()方法转换为字符串
            String id = Bytes.toString(result.getRow());
            String[] split = id.split("_");
            String pthone = split[0];
            String startTime = split[1];
            Long newstartTime = 20200000000000L-Long.parseLong(startTime);

            //调用返回结果的getValue()方法获取到每个字段值
            String wg = Bytes.toString(result.getValue("info".getBytes(), "wg".getBytes()));
            String cityID = Bytes.toString(result.getValue("info".getBytes(), "cityID".getBytes()));
            String qxID = Bytes.toString(result.getValue("info".getBytes(), "qxID".getBytes()));
            String stayTime = Bytes.toString(result.getValue("info".getBytes(), "stayTime".getBytes()));
            String leaveTime = Bytes.toString(result.getValue("info".getBytes(), "leaveTime".getBytes()));
            String day = Bytes.toString(result.getValue("info".getBytes(), "day".getBytes()));

            //输出到控制台
            System.out.println(pthone+"\t"+wg+"\t"+cityID+"\t"+qxID+"\t"+stayTime+"\t"+newstartTime+"\t"+leaveTime+"\t"+day);

            /**
             * 第二种方式，未知列
             *
             * @deprecated as of 0.96, use {@link CellUtil#cloneValue(Cell)}
             */
            List<Cell> cells = result.listCells();
            String id1 = Bytes.toString(result.getRow());
            String[] split1 = id1.split("_");
            String pthone1 = split1[0];
            String startTime1 = split1[1];

            System.out.print(pthone1+"\t"+startTime1+"\t");
            for (Cell cell : cells) {
                String s = Bytes.toString(CellUtil.cloneValue(cell));
                System.out.print(s);
                System.out.print("\t");
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    /**
     * 读取某个人的最新10条位置信息
     */
    @Test
    public void scanData(){
        try {
            //获取到表的实例
            HTableInterface dianxin_1 = conn.getTable("dianxin_1");
            //创建scan实例
            Scan scan = new Scan();

            //创建比较器 二进制前缀比较器
            BinaryPrefixComparator binaryPrefixComparator1 = new BinaryPrefixComparator("47BE1E866CFC071DB19D5E1C056BE28AE24C16E7".getBytes());
            RowFilter rowFilter = new RowFilter(CompareFilter.CompareOp.EQUAL, binaryPrefixComparator1);


            //创建一个过滤器集合
            FilterList filterList = new FilterList();
            //将多个过滤器加进去
            filterList.addFilter(rowFilter);

            //添加过滤器
            scan.setFilter(filterList);

            //获取到scan结果集
            ResultScanner scanner = dianxin_1.getScanner(scan);

            int count=0;
            //遍历这个结果集
            Result result;
            while ((result=scanner.next())!=null){
               print(result);
               count = count+1;
               if(count==10){
                   break;
               }
            }
        } catch (IOException e) {
            e.printStackTrace();
        }


    }


    /**
     * 读取某一天，某个人在某个城市的所有位置信息
     */
    @Test
    public void scanData1(){
        try {
            //获取到表的实例
            HTableInterface dianxin_1 = conn.getTable("dianxin_1");
            //创建scan实例
            Scan scan = new Scan();

            //创建比较器 二进制前缀比较器
            BinaryPrefixComparator binaryPrefixComparator1 = new BinaryPrefixComparator("47BE1E866CFC071DB19D5E1C056BE28AE24C16E7".getBytes());
            RowFilter rowFilter = new RowFilter(CompareFilter.CompareOp.EQUAL, binaryPrefixComparator1);

            //包含比较器
            SubstringComparator substringComparator = new SubstringComparator("20180503");

            //创建一个过滤器 列值过滤器
            SingleColumnValueFilter singleColumnValueFilter1 = new SingleColumnValueFilter("info".getBytes(), "day".getBytes(),
                    CompareFilter.CompareOp.EQUAL, substringComparator);

            //包含比较器
            SubstringComparator substringComparator1 = new SubstringComparator("83401");

            //创建一个过滤器 列值过滤器
            SingleColumnValueFilter singleColumnValueFilter2 = new SingleColumnValueFilter("info".getBytes(), "cityID".getBytes(),
                    CompareFilter.CompareOp.EQUAL, substringComparator1);


            //创建一个过滤器集合
            FilterList filterList = new FilterList();
            //将多个过滤器加进去
            filterList.addFilter(rowFilter);
            filterList.addFilter(singleColumnValueFilter2);
            filterList.addFilter(singleColumnValueFilter1);

            //添加过滤器
            scan.setFilter(filterList);

            //获取到scan结果集
            ResultScanner scanner = dianxin_1.getScanner(scan);

            //遍历这个结果集
            Result result;
            while ((result=scanner.next())!=null){
                print(result);
            }
            scanner.close();
        } catch (IOException e) {
            e.printStackTrace();
        }


    }




    /**
     * 关闭Hbase的连接
     */
    @After
    public void close(){
        /**
         * 关闭hBaseAdmin
         */
        for (int i = 0;i<5;i++){
            System.out.println();
        }

        if(hBaseAdmin!=null){
            try {
                hBaseAdmin.close();
                System.out.println("hBaseAdmin连接已经关闭。。");
            } catch (IOException e) {
                e.printStackTrace();
            }
        }

        /**
         * 关闭connection
         */
        if(conn!=null){
            try {
                conn.close();
                System.out.println("connection连接已经关闭。。");
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }


    public static void print(Result result){
        String id = Bytes.toString(result.getRow());
        String[] split = id.split("_");
        String pthone = split[0];
        String startTime = split[1];
        Long newstartTime = 20200000000000L-Long.parseLong(startTime);

        //调用返回结果的getValue()方法获取到每个字段值
        String wg = Bytes.toString(result.getValue("info".getBytes(), "wg".getBytes()));
        String cityID = Bytes.toString(result.getValue("info".getBytes(), "cityID".getBytes()));
        String qxID = Bytes.toString(result.getValue("info".getBytes(), "qxID".getBytes()));
        String stayTime = Bytes.toString(result.getValue("info".getBytes(), "stayTime".getBytes()));
        String leaveTime = Bytes.toString(result.getValue("info".getBytes(), "leaveTime".getBytes()));
        String day = Bytes.toString(result.getValue("info".getBytes(), "day".getBytes()));

        //输出到控制台
        System.out.println(pthone+"\t"+wg+"\t"+cityID+"\t"+qxID+"\t"+stayTime+"\t"+newstartTime+"\t"+leaveTime+"\t"+day);
    }
}

标签：info,Week10,String,import,day01,dianxin,rowkey,new,getBytes
来源： https://www.cnblogs.com/wyh-study/p/12168968.html