版本号：struts2.1.6
这种情况下实现功能：用户需要指定username登陆，进入相应的页面运行成功登陆作战，否则，它返回到着陆的登录页面，当直接进入操作页面（登陆访问页面后的能力）如果不同意，必须返回到登陆页面。
码，如以下：
一、页面
login.jsp
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title>yuewei‘Login</title>
<!--
<link rel="stylesheet" type="text/css" href="styles.css" mce_href="styles.css">
-->
</head>
<body>
<form action="login.action" method="post">
User:<input type="text" name="username"><br>
Passoword:<input type="password" name="password"><br>
<input type="submit" value="submit">
</form>
</body>
</html>
welcome.jsp
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title> yuewei‘s Welcome</title>
<!--
<link rel="stylesheet" type="text/css" href="styles.css" mce_href="styles.css">
-->
</head>
<body>
<h1>登录成功后显示此页面</h1>
<a href="show.action" mce_href="show.action">show</a>
</body>
</html>
show.jsp
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title>yuewei‘s Show</title>
<!--
<link rel="stylesheet" type="text/css" href="styles.css" mce_href="styles.css">
-->
</head>
<body>
Show This Page
登录后运行此页面<br>
</body>
</html>
二、Action
LoginFormAction
package com.ywjava.action;
import com.opensymphony.xwork2.ActionSupport;
public class LoginFormAction extends ActionSupport {
public String exexcute() {
return "success";
}
}
LoginAction
package com.ywjava.action;
import com.opensymphony.xwork2.ActionContext;
import com.opensymphony.xwork2.ActionSupport;
import com.ywjava.utils.Constants;
public class LoginAction extends ActionSupport{
private String username;
private String password;
public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password;
}
public String getUsername() {
return username;
}
public void setUsername(String username) {
this.username = username;
}
private boolean isInvalid(String value) {
return (value == null || value.length() == 0);
}
public String execute(){
System.out.println(username);
System.out.println(password);
if (isInvalid(getUsername()))
return INPUT;
if (isInvalid(getPassword()))
return INPUT;
if(this.getUsername().equals("yuewei")&& this.getPassword().equals("yuewei")){
ActionContext.getContext().getSession().put(Constants.USER_SESSION,getUsername());
ActionContext.getContext().getSession().put(Constants.PASS,getPassword());
return "success";
}
return "error";
}
}
ShowAction
package com.ywjava.action;
import com.opensymphony.xwork2.ActionSupport;
public class ShowAction extends ActionSupport {
public String execute() {
return "success";
}
}
三、拦截器
package com.ywjava.interceptot;
import java.util.Map;
import com.opensymphony.xwork2.Action;
import com.opensymphony.xwork2.ActionContext;
import com.opensymphony.xwork2.ActionInvocation;
import com.opensymphony.xwork2.interceptor.AbstractInterceptor;
import com.ywjava.utils.Constants;
public class LoginInterceptor extends AbstractInterceptor {
@Override
public String intercept(ActionInvocation invocation) throws Exception {
// 取得请求相关的ActionContext实例
ActionContext ctx = invocation.getInvocationContext();
Map session = ctx.getSession();
String user = (String) session.get(Constants.USER_SESSION);
// 假设没有登陆，或者登陆全部的username不是yuewei，都返回又一次登陆
if (user != null && user.equals("yuewei")) {
System.out.println("test");
return invocation.invoke();
}
ctx.put("tip", "你还没有登录");
return Action.LOGIN;
}
}
四 struts.xml
<?xml version="1.0" encoding="UTF-8"?
>
<!DOCTYPE struts PUBLIC
"-//Apache Software Foundation//DTD Struts Configuration 2.1//EN"
"http://struts.apache.org/dtds/struts-2.1.dtd">
<struts>
<package name="authority" extends="struts-default">
<!-- 定义一个拦截器 -->
<interceptors>
<interceptor name="authority"
class="com.ywjava.interceptot.LoginInterceptor">
</interceptor>
<!-- 拦截器栈 -->
<interceptor-stack name="mydefault">
<interceptor-ref name="defaultStack" />
<interceptor-ref name="authority" />
</interceptor-stack>
</interceptors>
<!-- 定义全局Result -->
<global-results>
<!-- 当返回login视图名时，转入/login.jsp页面 -->
<result name="login">/login.jsp</result>
</global-results>
<action name="loginform"
class="com.ywjava.action.LoginFormAction">
<result name="success">/login.jsp</result>
</action>
<action name="login" class="com.ywjava.action.LoginAction">
<result name="success">/welcome.jsp</result>
<result name="error">/login.jsp</result>
<result name="input">/login.jsp</result>
</action>
<action name="show" class="com.ywjava.action.ShowAction">
<result name="success">/show.jsp</result>
<!-- 使用这个拦截 -->
<interceptor-ref name="mydefault" />
</action>
</package>
</struts>