java实现hbase表创建、数据插入、删除表

最新推荐文章于 2025-03-22 15:18:30 发布

zhuiwenwen

最新推荐文章于 2025-03-22 15:18:30 发布

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本文介绍如何使用Java实现HBase的基本操作，包括创建表、添加数据、显示数据及删除表，提供了完整的代码示例。

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近日查看了相关资料后，梳理了一下用java实现hbase的表创建、数据插入、删除表，代码如下：

1、需要的jar包：

commons-codec-1.4.jar

commons-logging-1.0.4.jar

hadoop-0.20.2-core.jar

hbase-0.20.6.jar

log4j-1.2.15.jar

zookeeper-3.2.2.jar

2、代码：

package org.myhbase;

import java.io.IOException;

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.KeyValue;
import org.apache.hadoop.hbase.client.HBaseAdmin;
import org.apache.hadoop.hbase.client.HTable;
import org.apache.hadoop.hbase.client.Result;
import org.apache.hadoop.hbase.client.ResultScanner;
import org.apache.hadoop.hbase.client.Scan;
import org.apache.hadoop.hbase.io.BatchUpdate;

public class HBaseBasic02 {
   static HBaseConfiguration hbaseConfig=null;
   static{
       Configuration config=new Configuration();
       config.set("hbase.zookeeper.quorum","192.168.10.149,192.168.10.44,192.168.10.49");
       config.set("hbase.zookeeper.property.clientPort", "2181");
       hbaseConfig=new HBaseConfiguration(config);
   }

   /**
   * 创建一张表
   * @throws IOException
   */
   public static void createTable(String tablename) throws IOException{
       HBaseAdmin admin = new HBaseAdmin(hbaseConfig);
       if(admin.tableExists(tablename)){
           System.out.println("table Exists!!!");
       }else{
           HTableDescriptor tableDesc = new HTableDescriptor(tablename);
           tableDesc.addFamily(new HColumnDescriptor("name:"));
           admin.createTable(tableDesc);
           System.out.println("create table ok.");
       }
   }

   /**
   * 删除一张表
   * @throws IOException
   */
   public static void dropTable(String tablename) throws IOException{
       HBaseAdmin admin = new HBaseAdmin(hbaseConfig);
       admin.disableTable(tablename);
       admin.deleteTable(tablename);
       System.out.println("drop table ok.");
   }


   /**
   * 添加一条数据
   * @throws IOException
   */
   public static void addData(String tablename) throws IOException{
       HTable table=new HTable(hbaseConfig,tablename);
       BatchUpdate update=new BatchUpdate("Huangyi");
       update.put("name:java","http://www.sun.com".getBytes());
       table.commit(update);
       System.out.println("add data ok.");
   }


   /**
   * 显示所有数据
   * @throws IOException
   */
   public static void getAllData(String tablename) throws IOException{
       HTable table=new HTable(hbaseConfig,tablename);
       Scan s=new Scan();
       ResultScanner rs=table.getScanner(s);
       for(Result r:rs){
           for(KeyValue kv:r.raw()){
               System.out.println("rowkey : "+new String(kv.getRow()));
               System.out.println(new String(kv.getColumn())+" = "+new String(kv.getValue()));
           }
       }
   }

   public static void main(String [] args) throws IOException{
           String tablename="table_1";
           HBaseBasic02.createTable(tablename);
           HBaseBasic02.addData(tablename);
           HBaseBasic02.getAllData(tablename);
           HBaseBasic02.dropTable(tablename);
   }


}

转自：http://blog.youkuaiyun.com/karen_wang/article/details/6283729