考虑到Java代码一般就是查询hbase存储的hadoop运算的结果数据，下面记录下查询的简单范例代码

package com.lvmama.crm.web.controller.csVipManager;

import org.apache.hadoop.conf.Configuration;

import org.apache.hadoop.hbase.HBaseConfiguration;

import org.apache.hadoop.hbase.KeyValue;

import org.apache.hadoop.hbase.client.*;

import org.apache.hadoop.hbase.util.Bytes;

import org.junit.Before;

import org.junit.Test;

import java.io.IOException;

/**

* Created by zoubin on 2017-5-22.

*/

public class HbaseTest {

private Configuration configuration;

@Before

public void setUp(){

configuration = HBaseConfiguration.create();

configuration.set("hbase.zookeeper.quorum", "node3,node4,node5");//通过zookeeper关联上hbase

}

/**

* 根据rowkey查找数据

* @throws IOException

*/

@Test

public void getResult() throws IOException {

Get get = new Get(Bytes.toBytes("row1"));

HTable table = new HTable(configuration,Bytes.toBytes("test"));

Result result = table.get(get);

for(KeyValue keyValue: result.list()){

System.out.println("family :" + Bytes.toString(keyValue.getFamily()));//列簇名

System.out.println("qualifier :"+ Bytes.toString(keyValue.getQualifier()));//列名

System.out.println("value :"+Bytes.toString(keyValue.getValue()));//列对应的值

System.out.println("timestamp :" +keyValue.getTimestamp());//数据最后更新时间

System.out.println("---------------------------------");

}

}

/**

* 查询指定rowkey范围的数据

* @throws IOException

*/

@Test

public void getResults() throws IOException {

Scan scan = new Scan();

scan.setStartRow(Bytes.toBytes("row2"));

scan.setStopRow(Bytes.toBytes("row4"));//实验发现范围取[row2,row4),左闭右开

ResultScanner rs = null;

HTable table = new HTable(configuration, Bytes.toBytes("test"));

rs = table.getScanner(scan);

for(Result r : rs){

for (KeyValue kv : r.list()){

System.out.println("row:" + Bytes.toString(kv.getRow()));

System.out.println("family:"+ Bytes.toString(kv.getFamily()));

System.out.println("qualifier:"+ Bytes.toString(kv.getQualifier()));

System.out.println("value:" + Bytes.toString(kv.getValue()));

System.out.println("timestamp:" + kv.getTimestamp());

System.out.println("-------------------------------------------");

}

}

}

}