hbase学习笔记-----REST客户端

1. 启动REST服务

a.启动一个非守护进程模式的REST服务器(ctrl+c 终止)

bin/hbase rest start

b.启动守护进程模式的REST服务器

bin/hbase-daemon.sh start rest

默认启动的是8080端口(可以使用参数在启动时指定端口)，可以被访问。eg.  curl  http://<servername>:8080/

2.访问服务端的数据

3.使用Java API访问

 package rest;

 import org.apache.hadoop.conf.Configuration;
 import org.apache.hadoop.hbase.HBaseConfiguration;
 import org.apache.hadoop.hbase.client.Get;
 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.rest.client.Client;
 import org.apache.hadoop.hbase.rest.client.Cluster;
 import org.apache.hadoop.hbase.rest.client.RemoteHTable;
 import org.apache.hadoop.hbase.util.Bytes;
 import util.HBaseHelper;

 import java.io.IOException;

 /**
  * Created by root on 15-1-9.
  */
 public class RestExample {
     public static void main(String[] args) throws IOException {
         Configuration conf = HBaseConfiguration.create();

         HBaseHelper helper = HBaseHelper.getHelper(conf);
         helper.dropTable("testtable");
         helper.createTable("testtable", "colfam1");
         System.out.println("Adding rows to table...");
         helper.fillTable("testtable", 1, 10, 5, "colfam1");

         Cluster cluster=new Cluster();
         cluster.add("hadoop",8080);

         Client client=new Client(cluster);

         RemoteHTable table=new RemoteHTable(client,"testtable");

         Get get = new Get(Bytes.toBytes("row-30"));
         get.addColumn(Bytes.toBytes("colfam1"), Bytes.toBytes("col-3"));
         Result result1 = table.get(get);

         System.out.println("Get result1: " + result1);

         Scan scan = new Scan();
         scan.setStartRow(Bytes.toBytes("row-10"));
         scan.setStopRow(Bytes.toBytes("row-15"));
         scan.addColumn(Bytes.toBytes("colfam1"), Bytes.toBytes("col-5"));
         ResultScanner scanner = table.getScanner(scan);
         for (Result result2 : scanner) {
             System.out.println("Scan row[" + Bytes.toString(result2.getRow()) +
                     "]: " + result2);
         }

     }

 }