java 连接hbase

Posted 2022-03-11

package com.weshare.bigdata;

import org.apache.hadoop.hbase.Cell;
import org.apache.hadoop.hbase.HBaseConfiguration;
import org.apache.hadoop.hbase.TableName;
import org.apache.hadoop.hbase.client.*;
import org.apache.hadoop.hbase.util.Bytes;

public class hbaseLink
static org.apache.hadoop.conf.Configuration configuration=null;
private org.apache.hadoop.hbase.client.Connection connection=null;
private Table table=null;

public void init() throws Exception
    configuration=HBaseConfiguration.create();
    configuration.set("hbase.zookeeper.quorum", "服务器地址");
    configuration.set("hbase.zookeeper.property.clientPort", "服务器端口");// zookeeper端口
    connection=ConnectionFactory.createConnection(configuration);

// try
// table = connection.getTable(TableName.valueOf("hbase表名"));
// ResultScanner rs = table.getScanner(new Scan());
// int num=0;
// for (Result r : rs)
// Byte b= r.getRow(scan);
// System.out.println("获得到rowkey:" + new String(r.getRow()));
// num++;
//
// System.out.print(num);
// catch(Exception e)
// e.printStackTrace();
//

public void queryall(String tableName) throws Exception
table = connection.getTable(TableName.valueOf(tableName));
ResultScanner rs = table.getScanner(new Scan());
int num=0;
for (Result r : rs)
//System.out.println("获得到rowkey:" + new String(r.getRow()));
num++;

        
        System.out.print(num);

public void checkColName(String tableName,String rowkey,String exceptedColName) throws Exception
    table = connection.getTable(TableName.valueOf(tableName));//建立hbase表链接
    Get scan = new Get(rowkey.getBytes());//获取rokey，将其转义成byte字节
    Result r=table.get(scan);//使用转义的rowkey查询表，将其查询结果返回给Result
    System.out.println("1");
    if(r.rawCells().equals("")||r.rawCells()==null||r.rawCells().length==0)
        System.out.println("3");
    
    for (Cell keyValue : r.rawCells()) 
        System.out.println("2");
        String colName = Bytes.toString(keyValue.getQualifierArray(),keyValue.getQualifierOffset(),keyValue.getQualifierLength());
        if(!colName.equals(exceptedColName))
            System.out.println("校验成功,不存在colName："+exceptedColName+",实际colName:" + colName);
        else if(colName.isEmpty())
            System.out.println("校验成功，查询无colName");
        else
            System.out.println("校验失败");
        
        System.out.println("12:"+keyValue.getFamilyLength());

    

// Get coln=scan.addFamily(rowkey.getBytes());
// NavigableMap nm=scan.getFamilyMap(rowkey.getBytes());
// System.out.println(coln.toString());

public static void main(String[] args) throws Exception
    hbaseLink hl=new hbaseLink();
    hl.init();
    hl.queryall("tablename");

// hl.checkColName("table","rowkey","column");