public static void close(Connection conn,Statement statement,ResultSet reSet){
		
		if(reSet!=null){
			try {
				reSet.close();
			} catch (Exception e) {
				e.printStackTrace();
			}finally{
				/* 手动将其引用指向null,java的内存清理机制最终会对其清除 */
				reSet = null;
			}
		}
		
		if(statement!=null){
			try {
				statement.close();
			} catch (Exception e) {
				e.printStackTrace();
			}finally{
				/* 手动将其引用指向null,java的内存清理机制最终会对其清除 */
				statement = null;
			}
		}
		
		if(conn!=null){
			try {
				conn.close();
			} catch (Exception e) {
				e.printStackTrace();
			}finally{
				/* 手动将其引用指向null,java的内存清理机制最终会对其清除 */
				conn = null;
			}
		}
		
	}