2-1-6

本文主要是介绍2-1-6，对大家解决编程问题具有一定的参考价值，需要的程序猿们随着小编来一起学习吧！

package task;

import java.io.File;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import java.util.Scanner;

import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.hbase.Cell;
import org.apache.hadoop.hbase.CellUtil;
import org.apache.hadoop.hbase.HBaseConfiguration;
import org.apache.hadoop.hbase.HColumnDescriptor;
import org.apache.hadoop.hbase.HTableDescriptor;
import org.apache.hadoop.hbase.MasterNotRunningException;
import org.apache.hadoop.hbase.TableName;
import org.apache.hadoop.hbase.ZooKeeperConnectionException;
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.HBaseAdmin;
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.apache.hadoop.hbase.util.Bytes;

public class DataStorage_Hbase {
    //1、导入数据源
    private static String file = "resource\\gdp数据.txt";
    
    //数据库资源参数
    private static String name = "hbase.zookeeper.quorum";
    private static String value = "192.168.157.201";    
    private static byte[] tableName = Bytes.toBytes("bigdata6");
    private static byte[]  family = Bytes.toBytes("gdp");
    
    //2、数据库连接
    public static Connection getConnection() throws IOException {
        Configuration conf=HBaseConfiguration.create();
        conf.set(name, value); //设置HBase链接的配置参数
        Connection conn=ConnectionFactory.createConnection(conf);
        return conn;
    }
    
    //3、建表
    public static void createTable() throws Exception{
        Connection conn=getConnection(); //创建链接
        //表描述对象,表名bigdata
        HTableDescriptor htd=new HTableDescriptor(TableName.valueOf(tableName));
        //列描述对象
        HColumnDescriptor hcd=new HColumnDescriptor(family);
        htd.addFamily(hcd);
        Admin admin=conn.getAdmin();//管理者，负责建表、删表、禁用表等
        if(admin.tableExists(TableName.valueOf(tableName))) {
            admin.disableTable(TableName.valueOf(tableName));
            admin.deleteTable(TableName.valueOf(tableName));
        }
        admin.createTable(htd);
        admin.close();
        conn.close();
    }
    
    
    //4、批量插入数据
    public static void putData(ArrayList<String []> list) throws Exception {
        Connection conn=getConnection();
        Table table=conn.getTable(TableName.valueOf(tableName)); //创建表对象
        ArrayList<Put> puts=new ArrayList<Put>();//批量插入操作的put对象
        for(String[] line:list) {  //遍历list中的32行数据
            Put put=new Put(Bytes.toBytes(line[0]));//参数为行键，使用数据源的第一列作为行键
            put.addColumn(family,Bytes.toBytes("gj"),Bytes.toBytes(line[1]));
            put.addColumn(family,Bytes.toBytes("dq"),Bytes.toBytes(line[2]));
            put.addColumn(family,Bytes.toBytes("gdp"),Bytes.toBytes(line[3]));
            put.addColumn(family,Bytes.toBytes("bfb"),Bytes.toBytes(line[1]));
            puts.add(put);
        }
        table.put(puts);//批量插入32行数据
        table.close();
        conn.close();
    }
    
    //5、查询数据
    public static void scanData() throws IOException {
        Connection conn=getConnection();
        Scan scan=new Scan();
        Table table=conn.getTable(TableName.valueOf(tableName));
        ResultScanner rs=table.getScanner(scan);//扫描器
        for(Result result:rs) { //每行是一个result,由rowkey和cells组成
            String rowkey = Bytes.toString(result.getRow());//获取行键
            System.out.println("行键:"+rowkey);
            List<Cell> Cells=result.listCells(); //获取cells,即除行键外的其他列数据
            for(Cell cell:Cells) {
                String family = Bytes.toString(CellUtil.cloneFamily(cell));
                String qualifier = Bytes.toString(CellUtil.cloneQualifier(cell));
                String value = Bytes.toString(CellUtil.cloneValue(cell));
                System.out.println("值："+family+"_"+qualifier+":"+value);
            }
            
        }
        rs.close();
        table.close();
        conn.close();
    }
    
    //读取数据
    public static ArrayList<String []> readData() throws IOException {
        ArrayList<String[]> list = new ArrayList<String[]>();
        Scanner in = new Scanner(new File(file));
        while(in.hasNext()) {
            String read = in.nextLine();
            if(read!=null&&!read.equals(null)) {
                String[] line = read.split("\t");
                for(String str : line) {
                    System.out.println(str+",");
                }
                list.add(line);
            }
        }
        in.close();
        return list;
    }
    
    public static void main(String[] args) throws Exception {
        createTable();
        ArrayList<String[]> list = readData();
        putData(list);
        scanData();
    }

}

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