hbase1.2.4 java_HBase1.2.4使用JavaAPI创建和删除Table示例程序

刚开始接触Java API操作HBase，碰到了zookeeper，hbase的配置问题，后来报错：HMaser is not running的错误，最后从HBase官网找了一段Java操作HBase的Demo，稍微改动一下，运行成功了！直接上代码：

import org.apache.hadoop.conf.Configuration;

import org.apache.hadoop.hbase.*;

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

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

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

import org.apache.hadoop.hbase.io.compress.Compression.Algorithm;

import java.io.IOException;

/**

* Created by SunYanbo on 2016/11/10.

*/

public class HBaseOper {

private static final String TABLE_NAME = "myuser";

private static final String CF_DEFAULT = "info";

public static void createOrOverwrite(Admin admin, HTableDescriptor table) throws IOException {

TableName tableName = table.getTableName();

if(admin.isTableDisabled(tableName)){

//如果表不可用，先置为可用

admin.enableTable(tableName);

}

if (admin.tableExists(tableName)) {

admin.disableTable(tableName);

System.out.print("Table exists, delete it first... ");

admin.deleteTable(tableName);

System.out.print("Table deleted, Done. ");

}

admin.createTable(table);

}

public static void createSchemaTables(Configuration config) throws IOException {

try {

Connection connection = ConnectionFactory.createConnection(config);

Admin admin = connection.getAdmin();

HTableDescriptor table = new HTableDescriptor(TableName.valueOf(TABLE_NAME));

table.addFamily(new HColumnDescriptor(CF_DEFAULT).setCompressionType(Algorithm.NONE));

System.out.print("Creating table. ");

createOrOverwrite(admin, table);

System.out.println(" Done.");

}catch (Exception e){

System.out.println("Creating table failure：" + e.getMessage());

System.out.println("Creating table failure：" + e.getStackTrace());

System.out.println("Creating table failure：" + e.getCause());

}

}

public static void modifySchema (Configuration config) throws IOException {

try{

Connection connection = ConnectionFactory.createConnection(config);

Admin admin = connection.getAdmin();

TableName tableName = TableName.valueOf(TABLE_NAME);

if (!admin.tableExists(tableName)) {

System.out.println("Table does not exist.");

System.exit(-1);

}

HTableDescriptor table = admin.getTableDescriptor(tableName);

// Update existing table

HColumnDescriptor newColumn = new HColumnDescriptor("name");

newColumn.setCompactionCompressionType(Algorithm.GZ);

newColumn.setMaxVersions(HConstants.ALL_VERSIONS);

admin.addColumn(tableName, newColumn);

// Update existing column family

HColumnDescriptor existingColumn = new HColumnDescriptor(CF_DEFAULT);

existingColumn.setCompactionCompressionType(Algorithm.GZ);

existingColumn.setMaxVersions(HConstants.ALL_VERSIONS);

table.modifyFamily(existingColumn);

admin.modifyTable(tableName, table);

// Disable an existing table

admin.disableTable(tableName);

// Delete an existing column family

admin.deleteColumn(tableName, CF_DEFAULT.getBytes("UTF-8"));

// Delete a table (Need to be disabled first)

admin.deleteTable(tableName);

}catch (Exception e){

System.out.println("modifySchema failure：" + e.getMessage());

System.out.println("modifySchema failure：" + e.getStackTrace());

System.out.println("modifySchema failure：" + e.getCause());

}

}

public static void main(String[] args) throws IOException {

Configuration config = HBaseConfiguration.create();

/*

* 默认会从项目编译后的calss文件的根目录寻找文件，可以不指定

* 添加资源文件有以下几种方式：

* */

/**

* config.addResource(input);

*/

//InputStream input = HBaseOper.class.getResourceAsStream("/core-site.xml");

//config.addResource(input);

/**

* 官网给出的例子程序使用的是这种方法

* config.addResource(Path);

* Path可以为绝对路径，例如：D:\Program Files\hbase\conf\hbase-site.xml

*/

//Add any necessary configuration files (hbase-site.xml, core-site.xml)

//config.addResource(new Path("D:\Program Files\hbase\conf\hbase-site.xml"));

//config.addResource(new Path("D:\Program Files\hadoop\etc\hadoop\core-site.xml"));

createSchemaTables(config);

//modifySchema(config);

}

}