JSP中param动作的实例详解-巨人网络通讯

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