Windows 下Eclipse Java访问Linux下的Hbase过程

转：https://blog.csdn.net/kkdelta/article/details/20457319

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：

 

hbase.zookeeper.quorum 

hadoopsrv 

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;

import org.apache.hadoop.hbase.HBaseConfiguration;                                                                                                                            import org.apache.hadoop.hbase.HTableDescriptor;                                                                                                                                          import org.apache.hadoop.hbase.HColumnDescriptor;

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 tables = null; if (admin != null) { try { HTableDescriptor[] allTable = admin.listTables(); if (allTable.length > 0) tables = new ArrayList(); 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(); } }}