在Eclipse中运行JAVA代码远程操作HBase的示例

在Eclipse中运行JAVA代码远程操作HBase的示例

分类： 大数据 2014-03-04 13:47 3762人阅读 评论(2) 收藏 举报

下面是一个在Windows的Eclipse中通过JAVA操作一个Linux上运行的hbase的示例。
Hbase的配置需要注意下面一些要点:
1，服务器端用主机名配置hadoop和hbase，不要用IP
比如如下：
<property>  
 <name>hbase.zookeeper.quorum</name>  
 <value>hadoopsrv</value>  
</property>
2，hbase运行的机器上的机器名不能叫localhost
改/etc/sysconfig/network中的HOSTNAME
比如:
HOSTNAME=hadoopsrv
3，修改eclipse运行的windows客户端的C:\Windows\System32\drivers\etc\hosts文件.
对应到hbase运行服务器的ip,比如:
192.168.2.6 hadoopsrv
JAVA代码如下

package org.apache.hadoop.hbase;

import java.io.IOException;

import java.util.ArrayList;

import java.util.List;

import org.apache.hadoop.conf.Configuration;

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.HTablePool;

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

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

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

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

public class HbaseTest {

private HBaseAdmin admin = null;

// 定义配置对象HBaseConfiguration

private HBaseConfiguration cfg = null;

public HbaseTest() throws Exception {

Configuration HBASE_CONFIG = new Configuration();

HBASE_CONFIG.set("hbase.zookeeper.quorum", "192.168.2.6");

HBASE_CONFIG.set("hbase.zookeeper.property.clientPort", "2181");

cfg = new HBaseConfiguration(HBASE_CONFIG);

admin = new HBaseAdmin(cfg);

}

// 创建一张表，指定表名，列族

public void createTable(String tableName, String columnFarily)

throws Exception {

if (admin.tableExists(tableName)) {

System.out.println(tableName + "存在！");

System.exit(0);

} else {

HTableDescriptor tableDesc = new HTableDescriptor(tableName);

tableDesc.addFamily(new HColumnDescriptor(columnFarily));

admin.createTable(tableDesc);

System.out.println("创建表成功！");

}

}

// Hbase获取所有的表信息

public List getAllTables() {

List<String> tables = null;

if (admin != null) {

try {

HTableDescriptor[] allTable = admin.listTables();

if (allTable.length > 0)

tables = new ArrayList<String>();

for (HTableDescriptor hTableDescriptor : allTable) {

tables.add(hTableDescriptor.getNameAsString());

System.out.println(hTableDescriptor.getNameAsString());

}

} catch (IOException e) {

e.printStackTrace();

}

}

return tables;

}

// Hbase中往某个表中添加一条记录

public boolean addOneRecord(String table, String key, String family,

String col, byte[] dataIn) {

HTablePool tp = new HTablePool(cfg, 1000);

HTable tb = (HTable) tp.getTable(table);

Put put = new Put(key.getBytes());

put.add(family.getBytes(), col.getBytes(), dataIn);

try {

tb.put(put);

System.out.println("插入数据条" + key + "成功！！！");

return true;

} catch (IOException e) {

System.out.println("插入数据条" + key + "失败！！！");

return false;

}

}

// Hbase表中记录信息的查询

public void getValueFromKey(String table, String key) {

HTablePool tp = new HTablePool(cfg, 1000);

HTable tb = (HTable) tp.getTable(table);

Get get = new Get(key.getBytes());

try {

Result rs = tb.get(get);

if (rs.raw().length == 0) {

System.out.println("不存在关键字为" + key + "的行！!");

} else {

for (KeyValue kv : rs.raw()) {

System.out.println(new String(kv.getKey()) + " "

+ new String(kv.getValue()));

}

}

} catch (IOException e) {

e.printStackTrace();

}

}

// 显示所有数据，通过HTable Scan类获取已有表的信息

public void getAllData(String tableName) throws Exception {

HTable table = new HTable(cfg, tableName);

Scan scan = new Scan();

ResultScanner rs = table.getScanner(scan);

for (Result r : rs) {

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

System.out.println(new String(kv.getKey())

+ new String(kv.getValue()));

}

}

}

// Hbase表中记录信息的删除

public boolean deleteRecord(String table, String key) {

HTablePool tp = new HTablePool(cfg, 1000);

HTable tb = (HTable) tp.getTable(table);

Delete de = new Delete(key.getBytes());

try {

tb.delete(de);

return true;

} catch (IOException e) {

System.out.println("删除记录" + key + "异常！！！");

return false;

}

}

// Hbase中表的删除

public boolean deleteTable(String table) {

try {

if (admin.tableExists(table)) {

admin.disableTable(table);

admin.deleteTable(table);

System.out.println("删除表" + table + "!!!");

}

return true;

} catch (IOException e) {

System.out.println("删除表" + table + "异常!!!");

return false;

}

}

// 测试函数

public static void main(String[] args) {

try {

HbaseTest hbase = new HbaseTest();

// hbase.createTable("student", "fam1");

// hbase.getAllTables();

// hbase.addOneRecord("student","id1","fam1","name","Jack".getBytes());

// hbase.addOneRecord("student","id1","fam1","address","HZ".getBytes());

// hbase.getValueFromKey("student","id1");

// hbase.getAllData("student");

//hbase.deleteRecord("student", "id1");

hbase.deleteTable("student");

} catch (Exception e) {

e.printStackTrace();

}

}

}