Connection con=new GetConn().getCon();
        String sql="insert into user(name,sex) values('abcdd',2)";
         String sql2="select  @@IDENTITY   AS   'Identity '";
        try {
  PreparedStatement ps= con.prepareStatement(sql);
  PreparedStatement ps2= con.prepareStatement(sql2);
  ps.execute();
  ResultSet rs=ps2.executeQuery();
  if(rs.next()){
   System.out.println(rs.getString(1));
  }