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JSP中param動作的實例詳解

jsp中param動作的實例詳解

一 語法

<jsp:param name="參數(shù)名" value="參數(shù)值">

常常與<jsp:forward>一起使用，作為其子標(biāo)簽存在。 

二 代碼

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>系統(tǒng)登錄</h1>
  <hr>
  <form name="loginform" action="dologin.jsp" method="post">
   <table>
    <tr>
     <td>用戶名：</td>
     <td><input type="text" name="username"/></td>
    </tr>
    <tr>
     <td>密碼：</td>
     <td><input type="password" name="password"/></td>
    </tr>
    <tr>
     <td colspan="2"><input type="submit" value="登錄"/></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>用戶資料</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");
    }
   
  %>
    用戶名：<%=username %><br>
    密碼：<%=password %><br>
    電子郵箱：<%=email %><br>
 </body>
</html>

三 運行結(jié)果

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