JSP中param动作的实例详解

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="admin@123.net" 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

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