HBase的简单java操作

Posted 2020-08-01 One-Way

官方文档：http://hbase.apache.org/book.html

 

java简单操作hbase的表

 

  1 import org.apache.hadoop.conf.Configuration;
  2 import org.apache.hadoop.hbase.*;
  3 import org.apache.hadoop.hbase.client.*;
  4 import org.apache.hadoop.hbase.filter.CompareFilter;
  5 import org.apache.hadoop.hbase.filter.FilterList;
  6 import org.apache.hadoop.hbase.filter.SingleColumnValueFilter;
  7 import org.junit.Before;
  8 import org.junit.Test;
  9 
 10 import java.io.IOException;
 11 import java.util.ArrayList;
 12 import java.util.Iterator;
 13 import java.util.Random;
 14 
 15 /**
 16  * Created by Edward on 2016/6/19.
 17  */
 18 public class TestHbase {
 19 
 20     public static Configuration conf = null;
 21     public static TableName table = TableName.valueOf("phone");
 22     public static Random random = new Random();
 23 
 24     @Before
 25     public void setup()
 26     {
 27         //通过zookeeper集群，访问hbase
 28         conf = HBaseConfiguration.create();
 29         conf.set("hbase.zookeeper.quorum", "node1,node2,node3");
 30         System.out.println("setup");
 31     }
 32 
 33     @Test
 34     public void createTable() throws IOException {
 35         HBaseAdmin hBaseAdmin = new HBaseAdmin(conf);
 36        if(hBaseAdmin.tableExists(table)) {
 37             hBaseAdmin.disableTable(table);
 38             hBaseAdmin.deleteTable(table);
 39         }
 40         //表
 41         HTableDescriptor hTableDescriptor = new HTableDescriptor(table);
 42         //列族 cf1
 43         HColumnDescriptor hColumnDescriptor = new HColumnDescriptor("cf1");
 44         hColumnDescriptor.setBlockCacheEnabled(true);
 45         hColumnDescriptor.setBlocksize(128000);
 46         hColumnDescriptor.setMaxVersions(10);
 47         //表增加列族
 48         hTableDescriptor.addFamily(hColumnDescriptor);
 49         hBaseAdmin.createTable(hTableDescriptor);
 50     }
 51 
 52 
 53     @Test
 54     /**
 55      * 插入数据
 56      */
 57     public void insert() throws IOException {
 58 
 59         //创建htable对象
 60         HTable hTable = new HTable(conf, this.table);
 61         ArrayList<Put> list = new ArrayList<Put>();
 62 
 63         for(int i = 0; i<1000; i++)
 64         {
 65             //row_key
 66             Put put = new Put(String.valueOf(i).getBytes());
 67             //column,value
 68             put.add("cf1".getBytes(),"name".getBytes(),"ls".getBytes());
 69             put.add("cf1".getBytes(),"age".getBytes(), String.valueOf(i%100).getBytes());
 70             //把每个put对象放到列表中
 71             list.add(put);
 72         }
 73         //把信息放到表中
 74         hTable.put(list);
 75     }
 76 
 77 
 78     @Test
 79     /**
 80      * 查询
 81      */
 82     public void search() throws IOException
 83     {
 84 
 85         HTable hTable = new HTable(conf, this.table);
 86         // 创建row_key对应的get对象
 87         Get get = new Get("123".getBytes());
 88         // 获取get结果
 89         Result result = hTable.get(get);
 90         //获取 column latest cell
 91         Cell columnLatestCell = result.getColumnLatestCell("cf1".getBytes(), "name".getBytes());
 92         //使用 CellUtil 获取值
 93         byte[] bytes = CellUtil.cloneValue(columnLatestCell);
 94         System.out.println(new String(bytes));
 95     }
 96 
 97 
 98     @Test
 99     /**
100      *  通过scan方法获取数据
101      * **/
102     public void search1() throws IOException
103     {
104         HTable hTable = new HTable(conf, this.table);
105         //设置scan范围
106         Scan scan = new Scan("400".getBytes(),"450".getBytes());
107         //通过scan得到result scanner
108         ResultScanner scanner = hTable.getScanner(scan);
109         //使用迭代器
110         Iterator<Result> iterator = scanner.iterator();
111 
112         while(iterator.hasNext())
113         {
114             Result result= iterator.next();
115             Cell columnLatestCell = result.getColumnLatestCell("cf1".getBytes(), "age".getBytes());
116             //获取列族中列对应的值
117             byte[] bytes = CellUtil.cloneValue(columnLatestCell);
118             //获取row_key
119             byte[] bytes1 = CellUtil.cloneRow(columnLatestCell);
120             System.out.println(new String(bytes)+" "+new String(bytes1));
121         }
122     }
123 }