jsp---预处理语句对象PreparedStatement(8)

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                rs = pstmt.executeQuery();
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                while(rs.next()){
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                    int userid = rs.getInt(1);
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                    String username = rs.getString(2);
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                    String userpassword = rs.getString(3);
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                    out.println("用户的ID："+userid+"用户名："+username+"用户的密码："+userpassword+"<br />");
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                }
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            }catch(SQLException e){
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                out.println("添加用户信息失败");
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            }
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            try{
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                if(pstmt != null){
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                    pstmt.close();
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                    conn = null;
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                }
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                if(conn != null){
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                    conn.close();
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                    conn = null;
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                }
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            }catch(Exception e){
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