吴超老师课程--HBASE的Java_API

public static void main(String[] args) throws IOException {
    String tableName="hbase_tb";
    String columnFamily="cf";

    HBaseTestCase.create(tableName, columnFamily);
    HBaseTestCase.put(tableName, "row1", columnFamily, "cl1", "data");
    HBaseTestCase.get(tableName, "row1");
    HBaseTestCase.scan(tableName);
    HBaseTestCase.delete(tableName);
}

 //hbase操作必备
     private static Configuration getConfiguration() {
         Configuration conf = HBaseConfiguration.create();
         conf.set("hbase.rootdir", "hdfs://hadoop:9000/hbase");
         //使用eclipse时必须添加这个，否则无法定位
         conf.set("hbase.zookeeper.quorum", "hadoop");
         return conf;
     }

 //创建一张表
 public static void create(String tableName, String columnFamily) throws IOException{
     HBaseAdmin admin = new HBaseAdmin(getConfiguration());
     if (admin.tableExists(tableName)) {
         System.out.println("table exists!");
     }else{
         HTableDescriptor tableDesc = new HTableDescriptor(tableName);
         tableDesc.addFamily(new HColumnDescriptor(columnFamily));
         admin.createTable(tableDesc);
         System.out.println("create table success!");
     }
 }

 //添加一条记录
 public static void put(String tableName, String row, String columnFamily, String column, String data) throws IOException{
     HTable table = new HTable(getConfiguration(), tableName);
     Put p1 = new Put(Bytes.toBytes(row));
     p1.add(Bytes.toBytes(columnFamily), Bytes.toBytes(column),     Bytes.toBytes(data));
     table.put(p1);
     System.out.println("put'"+row+"',"+columnFamily+":"+column+"','"+data+"'");
 }

 //读取一条记录
 public static void get(String tableName, String row) throws IOException{
     HTable table = new HTable(getConfiguration(), tableName);
     Get get = new Get(Bytes.toBytes(row));
     Result result = table.get(get);
     System.out.println("Get: "+result);
 }

 //显示所有数据
 public static void scan(String tableName) throws IOException{
     HTable table = new HTable(getConfiguration(), tableName);
     Scan scan = new Scan();
     ResultScanner scanner = table.getScanner(scan);
     for (Result result : scanner) {
         System.out.println("Scan: "+result);
     }
 }

 //删除表
 public static void delete(String tableName) throws IOException{
     HBaseAdmin admin = new HBaseAdmin(getConfiguration());
     if(admin.tableExists(tableName)){
         try {
           admin.disableTable(tableName);
           admin.deleteTable(tableName);
         } catch (IOException e) {
           e.printStackTrace();
           System.out.println("Delete "+tableName+" 失败");
         }
     }
     System.out.println("Delete "+tableName+" 成功");
 }