图示：
配置 web.xml
<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.5" xmlns="http://java.sun.com/xml/ns/javaee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee
http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">
<display-name></display-name>
<filter>
<filter-name>struts2</filter-name>
<filter-class>org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter</filter-class>
</filter>
<filter-mapping>
<filter-name>struts2</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
<welcome-file-list>
<welcome-file>index.jsp</welcome-file>
</welcome-file-list>
</web-app>
实体类 User
package entity;
public class User {
private String username;
private String password;
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;
}
public String say(){
return "这是一个方法";
}
}
LoginAction Action类
package action;
import java.util.Map;
import com.opensymphony.xwork2.Action;
import com.opensymphony.xwork2.ActionContext;
import entity.User;
public class LoginAction implements Action {
private User user;
private String message;
public String getMessage() {
return message;
}
public void setMessage(String message) {
this.message = message;
}
public User getUser() {
return user;
}
public void setUser(User user) {
this.user = user;
}
public String execute() throws Exception {
//判断账号密码是否正确
if("admin".equals(user.getUsername())&&"admin".equals(user.getPassword())){
//session
Map<String, Object> session = ActionContext.getContext().getSession();
session.put("USER1", user);
//request
Map<String, Object> request = (Map<String, Object>)ActionContext.getContext().get("request");
request.put("USER2", user);
//application
Map<String, Object> application = ActionContext.getContext().getApplication();
application.put("USER3", user.getUsername());
//返回成功
return SUCCESS;
}else{
this.message = "用户名或者密码错误";
//返回重新输入
return INPUT;
}
}
}
配置 struts.xml
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE struts PUBLIC
"-//Apache Software Foundation//DTD Struts Configuration 2.3//EN"
"http://struts.apache.org/dtds/struts-2.3.dtd">
<struts>
<package name="default" namespace="/" extends="struts-default">
<action name="login" class="action.LoginAction" >
<result name="success" >welcome.jsp</result>
<result name="input" >login.jsp</result>
</action>
</package>
</struts>
login.jsp 页面
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%@taglib prefix="s" uri="/struts-tags"%>
<%
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>这是登陆页面</title>
</head>
<body>
<form action="login.action">
用户名：<input type="text" name="user.username" /><br /> 密码：<input
type="text" name="user.password" /><br /> <input type="submit"
value="提交">
</form>
<h4>${message }</h4>
<hr />
<s:form action="login">
<s:textfield label="用户名" name="user.username"></s:textfield>
<s:password label="密码" name="user.password"></s:password>
<s:submit value="提交"></s:submit>
</s:form>
<h4>
<s:property value="message" />
</h4>
</body>
</html>
welcome.jsp 页面
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%@taglib prefix="s" uri="/struts-tags"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme() + "://"
+ request.getServerName() + ":" + request.getServerPort()
+ path + "/";
%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<base href="<%=basePath%>">
<title>这是欢迎页面</title>
</head>
<body>
<s:debug></s:debug>
<h4>This is welcome Page</h4>
<h4>传统方式拿出来的值</h4>
<h4>${sessionScope.USER1.username }（从 session 拿出来）</h4>
<h4>${requestScope.USER2 }（从 request 拿出来）</h4>
<h4>${applicationScope.USER3 }（从 application 拿出来）</h4>
<hr />
<h4>Struts2 Tag</h4>
<h4>
<s:property value="#session.USER1.username" />
（从 session 拿出来,PS可以通过对象拿属性）
</h4>
<h4>
<s:property value="#request.USER2.say()" />
（从 request 拿出来，PS可以通过对象拿方法）
</h4>
<h4>
<s:property value="#application.USER3" />
（从 application 拿出来，PS可以直接取到对象）
</h4>
</body>
</html>
效果图：
