jdbc得到插入数据的id

//得到插入数据的id(statement还有很多关键字需要研究)
 public void getLastID(){
  try{
  Connection conn = null;
  PreparedStatement pstmt = null;
  ResultSet rs = null;
  String sql="insert into user(name,pwd) values(?,?)";
  pstmt = conn.prepareStatement(sql,java.sql.Statement.RETURN_GENERATED_KEYS);
  pstmt.executeUpdate();
  rs = pstmt.getGeneratedKeys();
  if(rs.next()){
   int id= rs.getInt(1);
  }
  }catch(Exception e){}
  
  }