Question

我使用jsp进行简单的登录页面

我的问题是getParameter始终为null

这是我的mainpage.jsp代码

<form action = "LoginProcess.jsp" method = "post">  
    <table align="center">
    <tr>
    <td><label for="userid">ID : </label></td>
    <td><input type="text" name="userid" id="userid"></td>
    </tr>
    <tr>
    <td><label for="userpw">PW : </label></td>
    <td><input type="password" name="userpw" id="userpw"></td>
    </tr>
    <tr>
    <td colspan="2" align="center">
    <input type="hidden" name="status">
    <input type="button" name="join" class="loingbtn" value="">
    <input type="button" name="find" class="loingbtn" value="">
    <input type="button" name="booking" class="loingbtn" value="">
    <input type="button" name="msg" class="loingbtn" value="">
    <input type="submit" name="login" class="loginbtn" value="">
</form>

这是loginprocess.jsp

<body>
    <jsp:useBean id = "brd" class = "mainpage.LoginUser" scope="page"/>
    <jsp:useBean id = "brddb" class = "mainpage.UserDB" scope="page"/>
    <%          
        String id = request.getParameter("userid");
        String passwd = request.getParameter("userpw");
        if ((brddb.isLogin(id, passwd))) {  
    %>
    <script>
        alert("Success");
    </script>
    <%
        }else{
            %>
            <script>
            alert("Fail");
            self.close();
            </script>
            <%
        }
%>

这两个变量是alaway null

String id = request.getParameter("userid");
String passwd = request.getParameter("userpw");

我能做什么

Answer 1

检查这两个类是否

    <jsp:useBean id = "brd" class = "mainpage.LoginUser" scope="page"/>
    <jsp:useBean id = "brddb" class = "mainpage.UserDB" scope="page"/>

您将id和psswd设置为null。

这可能是你获得null的唯一原因。

JSP Login getParameter返回null

1 个答案: