HBase JavaAPI操作示例

package testHBase;

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.Get;
import org.apache.hadoop.hbase.client.HBaseAdmin;
import org.apache.hadoop.hbase.client.HTable;
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.util.Bytes;

public class TestHBase {
	static Configuration cfg = HBaseConfiguration.create();  //得到配置对象
	public static void create(String tableName ,String columnFamily) throws Exception{
		HBaseAdmin admin = new HBaseAdmin(cfg);  //得到HBaseAdmin对象，用于操作HBase
		if(admin.tableExists(tableName)){
			System.out.println("Table" + tableName + " Exists!");
			System.exit(0);
		}
		else{
			HTableDescriptor tableDesc = new HTableDescriptor(tableName); //得到表描述对象  创建表时用到
			tableDesc.addFamily(new HColumnDescriptor(columnFamily)); //HColumnDescriptor 列族描述对象
			admin.createTable(tableDesc);  //创建表
			System.out.println("Table " + tableName + " Success!");
		}
	}

	static void put(String tableName,String row,String columnFamily,String column,String data) throws Exception{
		HTable table = new HTable(cfg,tableName);  //得到表对象
		Put put = new Put(Bytes.toBytes(row));		//插入数据
		put.add(Bytes.toBytes(columnFamily), Bytes.toBytes(column),Bytes.toBytes(data));
		table.put(put);
		System.out.println("put " + row +"," + "columnFamily:" + column + "," + data);

	}

	static void get(String tableName,String row) throws Exception{
		HTable table = new HTable(cfg,tableName);
		Get get = new Get(Bytes.toBytes(row));//获取行数据
		Result result = table.get(get);
		System.out.println("Get: " + result);
	}

	static void scan(String tableName) throws Exception{
		HTable table = new HTable(cfg,tableName);
		Scan scan = new Scan(Bytes.toBytes(tableName)); ///扫描全表
		ResultScanner rs = table.getScanner(scan);
		for(Result r : rs){
			System.out.println("Scan: " + r);
		}
	}

	static boolean delete(String tableName) throws Exception{
		HBaseAdmin admin = new HBaseAdmin(cfg);
		if(admin.tableExists(tableName)){
			admin.disableTable(tableName);  //先disable
			System.out.println("Disable Table " + tableName + " Success!");
			admin.deleteTable(tableName); //再删除
			System.out.println("Delete Table " + tableName + " Success!");
		}
		return true;

	}

	public static void main(String[] args) throws Exception {
		cfg.set("hbase.master", "hadoop:60000");
		cfg.set("hbase.rootdir", "hdfs://hadoop:9000/hbase");
		cfg.set("hbase.zookeeper.quorum", "hadoop");

		String tableName = "hbase_test";
		String columnFamily = "cf";
		create(tableName, columnFamily);
		put(tableName,"row1",columnFamily,"c1","data");
		scan(tableName);
		get(tableName,"row1");
		delete(tableName);

	}
}