Hbase的java API

HbaseApi.java

package com.carssun.hbase.api;

import java.util.ArrayList;
import java.util.List;

import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.hbase.Cell;
import org.apache.hadoop.hbase.HBaseConfiguration;
import org.apache.hadoop.hbase.HColumnDescriptor;
import org.apache.hadoop.hbase.HTableDescriptor;
import org.apache.hadoop.hbase.TableName;
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.client.Delete;
import org.apache.hadoop.hbase.client.Get;
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.client.Table;
import org.junit.Before;
import org.junit.Test;

import com.carssun.printUtil.HBasePrintUtil;


public class HbaseApi {
	private static final String ZK_CONNECT_KEY="hbase.zookeeper.quorum";
	private static final String ZK_CONNECT_VALUE="hadoop02:2199,hadoop03:2199,hadoop04:2199,hadoop05:2199";
	
	private static Table hTable=null;
	public static void main(String[] args) {
		
	}
	private static Connection conn=null;
	private static Admin admin=null;
	@Before
	public void init() throws Exception {
		Configuration conf=HBaseConfiguration.create();
		conf.set(ZK_CONNECT_KEY, ZK_CONNECT_VALUE);
		//獲取連接
		conn=ConnectionFactory.createConnection(conf);
		admin=conn.getAdmin();
		TableName tn=TableName.valueOf("Hbase1");//需要進行增刪操作的表
		hTable=conn.getTable(tn);
	}
	
	@Test
	public void createTable() throws Exception {
		TableName tn=TableName.valueOf("Hbase1");
		HTableDescriptor htd=new HTableDescriptor(tn);
		
		String familyName="base_info";
		HColumnDescriptor family=new HColumnDescriptor(familyName);
		htd.addFamily(family);
		admin.createTable(htd);
		//判斷是否創建成功
		if(admin.tableExists(tn)){
			System.out.println("創建陳功");
		}
		else{
			System.out.println("創建失敗");
		}
	}
	//列舉表的名字和簇名
	@Test
	public void listTable() throws Exception {
		HTableDescriptor[] listTables = admin.listTables();
		for(HTableDescriptor htd:listTables){
			HColumnDescriptor[] families = htd.getColumnFamilies();
			for(HColumnDescriptor hc:families){
				System.out.println(htd.getTableName()+"\t"+new String(hc.getName()));
			}
		}
	}
	//刪除表需要先把表diasable
	@Test
	public void  deleteTable() throws Exception {
		TableName tb=TableName.valueOf("Hbase1");
		//判斷是否是disable狀態
		boolean tableEnabled = admin.isTableEnabled(tb);
		//
		if(tableEnabled){
			admin.disableTable(tb);
		}
		admin.deleteTable(tb);
		if(admin.tableExists(tb)){
			System.out.println("刪除失敗");
		}
		else{
			System.out.println("刪除成功");
		}
	}
	
	/**插入數據 表示往某張表中插入數據
	 * 需要一個表對象
	 * @throws Exception 
	 * 
	 * */
	//批量添加
	@Test
	public void putData() throws Exception{
		Put put=new Put("rk03".getBytes());
		byte[] family="base_info".getBytes();//簇
		byte[] qualifier="qualifier".getBytes();
		byte[] value="yy".getBytes();
		put.addColumn(family, qualifier, value);
		
		Put put1=new Put("rk02".getBytes());
		byte[] family1="base_info".getBytes();//簇
		byte[] qualifier1="xxx".getBytes();
		byte[] value1="yy".getBytes();
		put1.addColumn(family1, qualifier1, value1);
		
		Put put2=new Put("rk01".getBytes());
		byte[] family2="base_info".getBytes();//簇
		byte[] qualifier2="jajaja".getBytes();
		byte[] value2="asdsa".getBytes();
		put2.addColumn(family2, qualifier2, value2);
		
		Put put3=new Put("rk01".getBytes());
		byte[] family3="base_info".getBytes();//簇
		byte[] qualifier3="jajaja44".getBytes();
		byte[] value3="asdsa".getBytes();
		put3.addColumn(family3, qualifier3, value3);
		
		Put put4=new Put("rk01".getBytes());
		byte[] family4="base_info".getBytes();//簇
		byte[] qualifier4="jajaja1".getBytes();
		byte[] value4="asdsa".getBytes();
		put4.addColumn(family4, qualifier4, value4);
		
		Put put5=new Put("rk01".getBytes());
		byte[] family5="base_info".getBytes();//簇
		byte[] qualifier5="jajaja2".getBytes();
		byte[] value5="asdsa".getBytes();
		put5.addColumn(family5, qualifier5, value5);
		
		List<Put> puts=new ArrayList<>();
		puts.add(put);
		puts.add(put1);
		puts.add(put2);
		puts.add(put3);
		puts.add(put4);
		puts.add(put5);
		puts.add(put1);
		hTable.put(puts);
	}
	
	@Test
	public void delete() throws Exception{
		Delete delete=new Delete("rk02".getBytes());//整個rowkey刪掉
		delete.addColumn("base_info".getBytes(),"xxx".getBytes());
		hTable.delete(delete);
	}
	
	@Test
	public void getData() throws Exception{
		
		Get get=new Get("rk03".getBytes());
		Result result = hTable.get(get);
		List<Cell> listCells = result.listCells();
		//下面是hbaseAPI的原生方法
		/*for(Cell c:listCells){
			String family=Bytes.toString(c.getFamily());
			String qualify=Bytes.toString(c.getQualifier());
			String value=Bytes.toString(c.getValue());
			long timestamp=c.getTimestamp();
			System.out.println(family+' '+qualify+" "+value+" "+timestamp);
		}*/
		//使用老師封裝好的方法打印
		HBasePrintUtil.printResult(result);
	}
	
	@Test
	public void getResultScanner() throws Exception{
		Scan scan=new Scan();
		//scan.addColumn("base_info".getBytes(), "xxx".getBytes());
		
		//scan.addColumn("base_info".getBytes(), "jajaja".getBytes());
		byte[] startRow="rk01".getBytes();
		scan.setStartRow(startRow);
		byte[] stopRow="rk03".getBytes();
		scan.setStopRow(stopRow);
		ResultScanner scanner=hTable.getScanner(scan);
		HBasePrintUtil.printResultScanner(scanner);
	}
}

接下來是封裝好的打印數據的方法，無論是resultScanner還是Result還是Cell最後都轉換成Cell對象輸出

HbasePrintUtil.hava

package com.carssun.printUtil;

import java.util.List;

import org.apache.hadoop.hbase.Cell;
import org.apache.hadoop.hbase.KeyValue;
import org.apache.hadoop.hbase.client.Result;
import org.apache.hadoop.hbase.client.ResultScanner;
import org.apache.hadoop.hbase.util.Bytes;

public class HBasePrintUtil {

	public static void printResultScanner(ResultScanner resultScann) {
		for (Result result : resultScann) {
			printResult(result);
		}
	}

	public static void printResult(Result result) {
		List<Cell> cells = result.listCells();
		for (int i = 0; i < cells.size(); i++) {
			Cell cell = cells.get(i);
			printCell(cell);
		}
	}

	public static void printCell(Cell cell) {
		System.out.println(Bytes.toString(cell.getRow()) + "\t" + Bytes.toString(cell.getFamily()) + "\t" + Bytes.toString(cell.getQualifier())
				+ "\t" + Bytes.toString(cell.getValue()) + "\t" + cell.getTimestamp());
	}

	public static void printKeyValye(KeyValue kv) {
		System.out.println(Bytes.toString(kv.getRow()) + "\t" + Bytes.toString(kv.getFamily()) + "\t" + Bytes.toString(kv.getQualifier()) + "\t"
				+ Bytes.toString(kv.getValue()) + "\t" + kv.getTimestamp());
	}
	
}