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[JSP编程] JSP中param动作的实例详解

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  • TA的每日心情
    无聊
    2019-6-2 14:11
  • 签到天数: 4 天

    [LV.2]圆转纯熟

    发表于 2020-2-11 19:11:14 | 显示全部楼层 |阅读模式
    JSP中param动作的实例详解
    一 语法

    <jsp:param name="参数名" value="参数值">

    常常与<jsp:forward>一起使用,作为其子标签存在。

    二 代码

    1、login.jsp


    <%@ page language="java" import="java.util.*" contentType="text/html; charset=utf-8" %>
    <%
    String path = request.getContextPath();
    String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
    %>

    <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
    <html>
    <head>
      <base href="<%=basePath%>" rel="external nofollow" rel="external nofollow" rel="external nofollow" >
      
      <title>My JSP 'login.jsp' starting page</title>
      
        <meta http-equiv="pragma" content="no-cache">
        <meta http-equiv="cache-control" content="no-cache">
        <meta http-equiv="expires" content="0">  
        <meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
        <meta http-equiv="description" content="This is my page">
        <!--
        <link rel="stylesheet" type="text/css" href="styles.css" rel="external nofollow" rel="external nofollow" rel="external nofollow" >
        -->

    </head>

    <body>
      <h1>系统登录</h1>
      <hr>
      <form name="loginForm" action="dologin.jsp" method="post">
       <table>
        <tr>
         <td>用户名:</td>
         <td><input type="text" name="username"/></td>
        </tr>
        <tr>
         <td>密码:</td>
         <td><input type="password" name="password"/></td>
        </tr>
        <tr>
         <td colspan="2"><input type="submit" value="登录"/></td>
        </tr>
       </table>
      </form>
    </body>
    </html>
    2、dologin.jsp


    <%@ page language="java" import="java.util.*" contentType="text/html; charset=utf-8"%>
    <%
    String path = request.getContextPath();
    String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
    %>

    <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
    <html>
    <head>
      <base href="<%=basePath%>" rel="external nofollow" rel="external nofollow" rel="external nofollow" >
      
      <title>My JSP 'dologin.jsp' starting page</title>
      
        <meta http-equiv="pragma" content="no-cache">
        <meta http-equiv="cache-control" content="no-cache">
        <meta http-equiv="expires" content="0">  
        <meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
        <meta http-equiv="description" content="This is my page">
        <!--
        <link rel="stylesheet" type="text/css" href="styles.css" rel="external nofollow" rel="external nofollow" rel="external nofollow" >
        -->

    </head>

    <body>
      <jsp:forward page="user.jsp">
       <jsp:param value="[email protected]" name="email"/>
       <jsp:param value="888888" name="password"/>
      </jsp:forward>
    </body>
    </html>
    3、user.jsp


    <%@ page language="java" import="java.util.*" contentType="text/html; charset=utf-8"%>
    <%
    String path = request.getContextPath();
    String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
    %>

    <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
    <html>
    <head>
      <base href="<%=basePath%>" rel="external nofollow" rel="external nofollow" rel="external nofollow" >
      
      <title>My JSP 'user.jsp' starting page</title>
      
        <meta http-equiv="pragma" content="no-cache">
        <meta http-equiv="cache-control" content="no-cache">
        <meta http-equiv="expires" content="0">  
        <meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
        <meta http-equiv="description" content="This is my page">
        <!--
        <link rel="stylesheet" type="text/css" href="styles.css" rel="external nofollow" rel="external nofollow" rel="external nofollow" >
        -->

    </head>

    <body>
      <h1>用户资料</h1>
      <hr>
      <%
        request.setCharacterEncoding("utf-8");
        String username = "";
        String password = "";
        String email = "";
        if(request.getParameter("username")!=null)
        {
         username = request.getParameter("username");
        }
        if(request.getParameter("password")!=null)
        {
         password = request.getParameter("password");
        }
        if(request.getParameter("email")!=null)
        {
         email = request.getParameter("email");
        }
       
      %>
        用户名:<%=username %><br>
        密码:<%=password %><br>
        电子邮箱:<%=email %><br>
    </body>
    </html>

    三 运行结果

    JSP中param动作的实例详解-1.jpg

    如有疑问请留言或者到本站社区交流讨论,感谢阅读,希望能帮助到大家,谢谢大家对本站的支持!

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