使用java操作hbase（单节点）

1.在运行java代码之前，一定要先启动Hbase,很重要！！
   cd /home/cx/itcast/hbase-1.2.6/bin
   ./start-hbase.sh
2.新建一个java项目，导入相关的jar包，放在lib目录下，并右键build path将它们添加到referenced libraries
3.在项目下新建conf文件夹，将Hbase的配置文件hbase-site.xml复制到该目录，然后选择项目属性，在Libraies->add class
  folder，将conf目录选上。（这一步代替了集群情况下，java连接zookeeper的操作）
  hbase-site.xml配置如下：

 <configuration>  
  <property>  
   <name>hbase.rootdir</name>  
   <value>file:///home/cx/myhbase1/</value>  
  </property>  
  <property>  
    <name>hbase.zookeeper.property.dataDir</name>  
    <value>/home/bigfish/myhbase1/zookeeper</value>  
  </property>  
  </configuration>  

4.java代码如下：

package com.cx;

import java.io.IOException;
import java.util.ArrayList;
import java.util.List;

import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.hbase.HBaseConfiguration;
import org.apache.hadoop.hbase.HColumnDescriptor;
import org.apache.hadoop.hbase.HTableDescriptor;
import org.apache.hadoop.hbase.MasterNotRunningException;
import org.apache.hadoop.hbase.TableName;
import org.apache.hadoop.hbase.ZooKeeperConnectionException;
import org.apache.hadoop.hbase.client.*;
import org.apache.hadoop.hbase.util.Bytes;



public class Hbase1 {
    static private Configuration conf=HBaseConfiguration.create();;
    //------------------创建表操作 -------------------------------------
    public static void createTable(String tableName,String[] cfs) throws Exception {
        HBaseAdmin admin=new HBaseAdmin(conf);
        if(admin.tableExists(tableName)) {
            System.out.println("表已经存在");
        }else {
            //指定表名
            HTableDescriptor htd=new HTableDescriptor(TableName.valueOf(tableName));
            //添加列族
            for(int i=0;i<cfs.length;i++) {
                htd.addFamily(new HColumnDescriptor(cfs[i]));
            }
            //创建表
            admin.createTable(htd);
            System.out.println("表创建成功！");
        }
        admin.close(); 
    }
    //----------------------一次插入一条数据----------------------------------
    public static  void put
    (String tableName,String row,String columnFamily,String column,String data) throws Exception{
        //得到一个表对象
        HTable table =new HTable(conf, tableName);
        //得到一个Put对象
        //将字符串转换为字符数组
        Put put=new Put(Bytes.toBytes(row));
        put.add(Bytes.toBytes(columnFamily), Bytes.toBytes(column), Bytes.toBytes(data));
        //在表中放入put对象   
        table.put(put);
        System.out.println("插入数据成功!");
        table.close();
    }
//    //----------------------一次插入海量数据(1oow)--------------------------
//    public static  void putAll(String tableName) throws Exception{
//        HTable table =new HTable(conf, tableName);
//        //得到list对象//得到list对象
//
//        List<Put> puts=new ArrayList<Put>(10000);
//        for(int i=1;i<=1000000;i++) {
//               Put put =new Put(Bytes.toBytes("rk"+i));
//               put.add(Bytes.toBytes("info"), Bytes.toBytes("money"), Bytes.toBytes(""+i));
//               puts.add(put);
//               //每隔1w条放一次
//               if(i%10000==0){
//                   table.put(puts);
//                   puts=new ArrayList<Put>(10000);//相当于清空
//               }
//        }
//        table.put(puts);
//        table.close();
//    }
    //------------------查询一个---------------------------
        public static void get(String tableName,String row) throws IOException{
            HTable table =new HTable(conf, tableName);
            Get get =new Get(Bytes.toBytes(row));
            //传get对象
            //返回result对象
            Result result=table.get(get);
            String r=Bytes.toString(result.getValue(Bytes.toBytes("info"), Bytes.toBytes("name")));
            System.out.println("get="+r);
            table.close();
        }
  //---------------------查询多个-------------------------------
        public static void scan(String tablename) throws Exception{  
                 HTable table = new HTable(conf, tablename);  
                 Scan scan = new Scan();  
                 ResultScanner rs = table.getScanner(scan);  
                 for(Result result:rs){  
                     String r=Bytes.toString(result.getValue(Bytes.toBytes("info"),Bytes.toBytes("name")));
                     System.out.println("Scan:"+r);  
                  } 
                 table.close();
                }
  //----------------------更新（put将老版本覆盖，查询最新的）-----------------
 
        
 //-------------------------删除--------------------------------------
        public static void del(String tableName) throws IOException{
             HTable table =new HTable(conf, tableName);
            //创建delete对象
             Delete delete = new Delete(Bytes.toBytes("rk0003"));
             table.delete(delete);
             System.out.println("删除成功!");
             table.close();
        }
    
    public static void main(String args[]) throws Exception  
    {   
          
        String tableName="people";  
        String columnFamilys[]={"info","data"};  
        Hbase1.createTable(tableName, columnFamilys);  
        Hbase1.put(tableName,"rk0001" , "info", "name", "cx");
        Hbase1.put(tableName,"rk0002" , "info", "name", "zhangsan");
        Hbase1.put(tableName,"rk0001" , "info", "age", "20");
        Hbase1.put(tableName,"rk0001" , "info", "sex", "male");
        Hbase1.put(tableName,"rk0001" , "info", "height", "1.75");
        Hbase1.put(tableName,"rk0002" , "info", "age", "22");
        Hbase1.put(tableName,"rk0001" , "data", "sal", "10000");
        Hbase1.put(tableName,"rk0003" , "info", "age", "25");
       // Hbase1.putAll(tableName);
        Hbase1.get(tableName,"rk0001");
        Hbase1.scan(tableName);  
        Hbase1.del(tableName);  
    }  
    
}

5.运行无错误

6.在命令行中查询表是否建立成功