標籤：jsp javabean 範圍範圍
package com.po;public class Users {private String username;private String password;public Users(){}public String getUsername() {return username;}public void setUsername(String username) {this.username = username;}public String getPassword() {return password;}public void setPassword(String password) {this.password = password;}}
<%@ page language="java" import="java.util.*" contentType="text/html; charset=utf-8"%><%@ page import="com.po.Users" %><%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%>"> <title>My JSP 'index.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">--> </head> <body> <h1>普通方式使用JavaBean</h1> <hr> <% Users user = new Users(); user.setName("admin"); user.setPassword("123456"); %> <%=user.getName() %> </body></html>
//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%>"> <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">--> </head> <body> <form action="dologin.jsp" name="loginForm" method="post"> <table> <tr> <td>使用者名稱：</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" align="center"><input type="submit" value="登陸"/></td> </tr> </table> </form> </body></html>
//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%>"> <title>My JSP 'index.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">--> </head> <body> <h1>useBean標籤使用JavaBean</h1> <hr> <%-- --%> <jsp:useBean id="myUser" class="com.po.Users" scope="page"></jsp:useBean> <%-- <jsp:setProperty property="*" name="myUser"/> --%> <%-- <jsp:setProperty property="password" name="myUser"/> --%> <%-- <jsp:setProperty property="username" name="myUser" value="bluze"/> <jsp:setProperty property="password" name="myUser" value="世界"/> --%> <jsp:setProperty property="username" name="myUser"/> <jsp:setProperty property="password" name="myUser"/> <%--使用傳統運算式的方法擷取使用者名稱和密碼 --%> <%-- <%=myUser.getUsername() %> <%=myUser.getPassword() %> --%> 使用者名稱：<jsp:getProperty property="username" name="myUser"/><br/> 密碼：<jsp:getProperty property="password" name="myUser"/><br/> <a href="testScope.jsp">測試範圍</a> <% request.getRequestDispatcher("testScope.jsp").forward(request, response); %> </body></html>
//testScope.jsp<%@ page language="java" import="java.util.*" contentType="text/html; charset=utf-8"%><%@ page import="com.po.Users" %><%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%>"> <title>My JSP 'testScope.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">--> </head> <body> <%-- <jsp:useBean id="myUser" class="com.po.Users" scope="application"></jsp:useBean> <%=((Users)application.getAttribute("myUser")).getUsername() %> <%=((Users)application.getAttribute("myUser")).getPassword() %> --%> <%-- <jsp:useBean id="myUser" class="com.po.Users" scope="session"></jsp:useBean> <%=((Users)session.getAttribute("myUser")).getUsername() %> <%=((Users)session.getAttribute("myUser")).getPassword() %> --%> <%-- <jsp:useBean id="myUser" class="com.po.Users" scope="request"></jsp:useBean> <%=((Users)request.getAttribute("myUser")).getUsername() %> <%=((Users)request.getAttribute("myUser")).getPassword() %> --%> <jsp:useBean id="myUser" class="com.po.Users" scope="page"></jsp:useBean> <% String username = ""; String password = ""; if(request.getAttribute("myUser")!=null){ username = ((Users)request.getAttribute("myUser")).getUsername(); password = ((Users)request.getAttribute("myUser")).getPassword(); } %> 使用者名稱：<%=username %> 密碼：<%=password %> </body></html>
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