eclipse远程操作hbase

一、新建本地java工程

file->new->java project

 

二、添加jar包和配置文件

1、添加JAR包

　　右击Propertie在弹出的快捷菜单中选择Java Build Path对话框，在该对话框中单击Libraries选项卡，在该选项卡下单击

Add External JARs按钮，定位到$HBASE/lib目录下，并选取如下JAR包。

hadoop-core-1.0.0.jar

commons-loggings-version.jar

commons-cli-version.jar

commons-lang-version.jar

commons-configuration-version.jar

hbase-0.94.1.jar

zookeeper-3.4.3.jar

slf4j-api-1.5.8.jar

slf4j-log4j12-1.5.8.jar

log4j-1.2.16.jar

protobuf-java-2.4.1.jar

2、添加hbase-site.xml配置文件

　　在工程根目录下创建conf文件夹，将$HBASE_HOME/conf/目录中的hbase-site.xml文件复制到该文件夹中。通过右键

选择Propertie->Java Build Path->Libraries->Add Class Folder。

 

3、windows下开发HBase应用程序，HBase部署在linux环境中，在运行调试时可能会出现无法找到主机，类似异常信息如下：java.net.UnknownHostException: unknown host: master

解决办法如下：在C:\WINDOWS\system32\drivers\etc\hosts文件中添加如下信息

192.168.2.34 master

 

4、HBase Java API简单用例

package com.hbase.examples;

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.client.Delete;       
import org.apache.hadoop.hbase.client.Get;       
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.client.Put;       
import org.apache.hadoop.hbase.util.Bytes;  

public class HBaseTestCase {
    //声明静态配置    HBaseConfiguration
    static Configuration cfg = HBaseConfiguration.create();
    
    //创建一张表，通过HBaseAdmin HTableDescriptor来创建
    public static void creat(String tablename,String columnFamily) throws Exception{
        HBaseAdmin admin = new HBaseAdmin(cfg);
        if(admin.tableExists(tablename)){
            System.out.println("table Exists!");
            //System.exit(0);
        }else{
            HTableDescriptor tableDesc = new HTableDescriptor(tablename);
            tableDesc.addFamily(new HColumnDescriptor(columnFamily));
            admin.createTable(tableDesc);
            System.out.println("create table success!");
        }
    }
    
    //添加一条数据，通过HTable Put 为已经存在的表来添加数据
    public static void put(String tablename,String row,String columnFamily,String column,String data) throws Exception{
        HTable table = new HTable(cfg,tablename);
        Put p1 = new Put(Bytes.toBytes(row));
        p1.add(Bytes.toBytes(columnFamily),Bytes.toBytes(column),Bytes.toBytes(data));
        table.put(p1);
        System.out.println("put '"+row+"','"+columnFamily+":"+column+"','"+data+"'");
    }
    
    public static void get(String tablename,String row) throws IOException{
        HTable table = new HTable(cfg,tablename);
        Get g = new Get(Bytes.toBytes(row));
        Result result = table.get(g);
        System.out.println("Get: "+result);
    }
    
    //显示所有数据，通过HTable Scan来获取已有表的信息
    public static void scan(String tablename) throws Exception{
        HTable table = new HTable(cfg,tablename);
        Scan s = new Scan();
        ResultScanner rs = table.getScanner(s);
        for(Result r:rs){
            System.out.println("Scan: "+r);
        }
    }
    
    public static boolean delete(String tablename) throws IOException{
        HBaseAdmin admin = new HBaseAdmin(cfg);
        if(admin.tableExists(tablename)){
            try{
                admin.disableTable(tablename);
                admin.deleteTable(tablename);
            }catch(Exception ex){
                ex.printStackTrace();
                return false;
            }
        }
        return true;
    }
    
    public static void main(String [] args){
        String tablename="hbase_tb";
        String columnFamily="cf";
        
        try{
            HBaseTestCase.creat(tablename, columnFamily);
            HBaseTestCase.put(tablename, "row2", columnFamily, "cl1", "data");
            HBaseTestCase.get(tablename, "row1");
            HBaseTestCase.scan(tablename);
            if(true==HBaseTestCase.delete(tablename)) System.out.println("Delete table:"+tablename+"success!");
        }
        catch (Exception e){
            e.printStackTrace();
        }
    }
}

 

package com.hbase.examples;

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.KeyValue;       
import org.apache.hadoop.hbase.MasterNotRunningException;       
import org.apache.hadoop.hbase.ZooKeeperConnectionException;       
import org.apache.hadoop.hbase.client.Delete;       
import org.apache.hadoop.hbase.client.Get;       
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.client.Put;       
import org.apache.hadoop.hbase.util.Bytes;       
        
public class HBaseTest {         
           
    private static Configuration conf =null;    
     /**  
      * 初始化配置  
     */    
     static {    
         conf = HBaseConfiguration.create();    
     }    
         
    /**    
     * 创建一张表    
     */      
    public static void creatTable(String tableName, String[] familys) throws Exception {       
        HBaseAdmin admin = new HBaseAdmin(conf);       
        if (admin.tableExists(tableName)) {       
            System.out.println("table already exists!");       
        } else {       
            HTableDescriptor tableDesc = new HTableDescriptor(tableName);       
            for(int i=0; i<familys.length; i++){       
                tableDesc.addFamily(new HColumnDescriptor(familys[i]));       
            }       
            admin.createTable(tableDesc);       
            System.out.println("create table " + tableName + " ok.");       
        }        
    }       
           
    /**    
     * 删除表    
     */      
    public static void deleteTable(String tableName) throws Exception {       
       try {       
           HBaseAdmin admin = new HBaseAdmin(conf);       
           admin.disableTable(tableName);       
           admin.deleteTable(tableName);       
           System.out.println("delete table " + tableName + " ok.");       
       } catch (MasterNotRunningException e) {       
           e.printStackTrace();       
       } catch (ZooKeeperConnectionException e) {       
           e.printStackTrace();       
       }       
    }       
            
    /**    
     * 插入一行记录    
     */      
    public static void addRecord (String tableName, String rowKey, String family, String qualifier, String value)       
            throws Exception{       
        try {       
            HTable table = new HTable(conf, tableName);       
            Put put = new Put(Bytes.toBytes(rowKey));       
            put.add(Bytes.toBytes(family),Bytes.toBytes(qualifier),Bytes.toBytes(value));       
            table.put(put);       
            System.out.println("insert recored " + rowKey + " to table " + tableName +" ok.");       
        } catch (IOException e) {       
            e.printStackTrace();       
        }       
    }       
        
    /**    
     * 删除一行记录    
     */      
    public static void delRecord (String tableName, String rowKey) throws IOException{       
        HTable table = new HTable(conf, tableName);       
        List list = new ArrayList();       
        Delete del = new Delete(rowKey.getBytes());       
        list.add(del);       
        table.delete(list);       
        System.out.println("del recored " + rowKey + " ok.");       
    }       
            
    /**    
     * 查找一行记录    
     */      
    public static void getOneRecord (String tableName, String rowKey) throws IOException{       
        HTable table = new HTable(conf, tableName);       
        Get get = new Get(rowKey.getBytes());       
        Result rs = table.get(get);       
        for(KeyValue kv : rs.raw()){       
            System.out.print(new String(kv.getRow()) + " " );       
            System.out.print(new String(kv.getFamily()) + ":" );       
            System.out.print(new String(kv.getQualifier()) + " " );       
            System.out.print(kv.getTimestamp() + " " );       
            System.out.println(new String(kv.getValue()));       
        }       
    }       
            
    /**    
     * 显示所有数据    
     */      
    public static void getAllRecord (String tableName) {       
        try{       
             HTable table = new HTable(conf, tableName);       
             Scan s = new Scan();       
             ResultScanner ss = table.getScanner(s);       
             for(Result r:ss){       
                 for(KeyValue kv : r.raw()){       
                    System.out.print(new String(kv.getRow()) + " ");       
                    System.out.print(new String(kv.getFamily()) + ":");       
                    System.out.print(new String(kv.getQualifier()) + " ");       
                    System.out.print(kv.getTimestamp() + " ");       
                    System.out.println(new String(kv.getValue()));       
                 }       
             }       
        } catch (IOException e){       
            e.printStackTrace();       
        }       
    }       
           
    public static void  main (String [] agrs) {       
        try {       
            String tablename = "scores";       
            String[] familys = {"grade", "course"};       
            HBaseTest.creatTable(tablename, familys);       
                    
            //add record zkb       
            HBaseTest.addRecord(tablename,"zkb","grade","","5");       
            HBaseTest.addRecord(tablename,"zkb","course","","90");       
            HBaseTest.addRecord(tablename,"zkb","course","math","97");       
            HBaseTest.addRecord(tablename,"zkb","course","art","87");       
            //add record  baoniu       
            HBaseTest.addRecord(tablename,"baoniu","grade","","4");       
            HBaseTest.addRecord(tablename,"baoniu","course","math","99");       
                    
            System.out.println("===========get one record========");       
            HBaseTest.getOneRecord(tablename, "zkb");       
                    
            System.out.println("===========show all record========");       
            HBaseTest.getAllRecord(tablename);       
                    
            System.out.println("===========del one record========");       
            HBaseTest.delRecord(tablename, "baoniu");       
            HBaseTest.getAllRecord(tablename);       
                    
            System.out.println("===========show all record========");       
            HBaseTest.getAllRecord(tablename);       
        } catch (Exception e) {       
            e.printStackTrace();       
        }       
    }       
}