Hadoop应用实验： HBase Java API使用

// 创建主程序类 public class HBaseDemo {     HBaseAdmin hba = null;     HTable htable = null;     String tableName = "phone";          // 连接函数，连接HBase，待进行后续操作     @Before     public void conn() throws MasterNotRunningException, ZooKeeperConnectionException, IOException{         Configuration conf = new Configuration();         conf.set("hbase.zookeeper.quorum", "node02,node03,node04");         hba = new HBaseAdmin(conf);         htable = new HTable(conf, tableName);     }          // 创建表函数     @Test     public void createTable() throws IOException{         if (hba.tableExists(tableName)){            hba.disableTable(tableName);            hba.deleteTable(tableName);         }                 HTableDescriptor desc = new HTableDescriptor(tableName.valueOf(tableName));         HColumnDescriptor cf = new HColumnDescriptor("cf");         cf.setBlockCacheEnabled(true);         cf.setInMemory(true);         desc.addFamily(cf);         hba.createTable(desc);     }          // 插入数据     @Test     public void insertDB() throws RetriesExhaustedWithDetailsException, InterruptedIOException{         byte[] rk = "111".getBytes();         Put put = new Put(rk);         put.add("cf".getBytes(), "name".getBytes(), "zhangsan".getBytes());         put.add("cf".getBytes(), "age".getBytes(), "10".getBytes());         put.add("cf".getBytes(), "sex".getBytes(), "m".getBytes());         htable.put(put);     }          // 获取数据     @Test     public void getDB() throws IOException{         Get get = new Get("111".getBytes());         get.addColumn("cf".getBytes(), "name".getBytes());         get.addColumn("cf".getBytes(), "age".getBytes());         Result result = htable.get(get);         Cell cellName = result.getColumnLatestCell("cf".getBytes(), "name".getBytes());         Cell cellAge = result.getColumnLatestCell("cf".getBytes(), "age".getBytes());         byte[] name = CellUtil.cloneValue(cellName);         byte[] age = CellUtil.cloneValue(cellAge);         System.out.println("姓名：" + new String(name));         System.out.println("年龄：" + new String(age));     }          // 查询表中所有数据     @Test     public void scanDB() throws IOException     {         Scan scan = new Scan();         ResultScanner result = htable.getScanner(scan);         Iterator<Result> iterator = result.iterator();         while(iterator.hasNext())         {            Result rs = iterator.next();            Cell cellName = rs.getColumnLatestCell("cf".getBytes(), "name".getBytes());            Cell cellAge = rs.getColumnLatestCell("cf".getBytes(), "age".getBytes());            Cell cellSex = rs.getColumnLatestCell("cf".getBytes(), "sex".getBytes());                       System.out.println(new String(CellUtil.cloneValue(cellName)));            System.out.println(new String(CellUtil.cloneValue(cellAge)));            System.out.println(new String(CellUtil.cloneValue(cellSex)));         }     }         //关闭HBase连接     @After     public void close(){         if (null != hba){            try{                hba.close();            }catch(IOException ex){                ex.printStackTrace();            }         }                 if (null != htable){            try{                htable.close();            }catch(IOException ex)            {                ex.printStackTrace();            }         }     } }