JSP中param动作的实例详解

作者：袖梨 2023-09-06

这篇文章主要介绍了JSP中param动作的实例详解的相关资料,希望通过本文能帮助到大家，需要的朋友可以参考下

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