Struts2自定义拦截器

 1 public class LoginInterceptor extends AbstractInterceptor
 2 {
 3 
 4     @Override
 5     public String intercept(ActionInvocation ai) throws Exception
 6     {
 7         // TODO Auto-generated method stub
 8         System.out.println("--------------intercept");
 9         String methodName = ai.getProxy().getMethod(); //获得被拦截的方法名字
10         System.out.println("=============" + methodName);
11         if (methodName.equals("userLogin"))
12         {
13             return ai.invoke();//放行：继续向下执行
14         }
15         //获得登陆成功之后，会话对象封装的数据
16         Object obj = ai.getInvocationContext().getSession().get("user");
17         if (obj == null)
18         {
19             return Action.LOGIN;  //跳转到登陆页面
20         } else
21         {
22             return ai.invoke();//放行：继续向下执行
23         }
24     }
25 }

 1 <?xml version="1.0" encoding="UTF-8"?>
 2  <!DOCTYPE struts PUBLIC
 3     "-//Apache Software Foundation//DTD Struts Configuration 2.3//EN"
 4     "http://struts.apache.org/dtds/struts-2.3.dtd">
 5 <struts>
 6     <package name="user" namespace="/" extends="struts-default">
 7         <interceptors>
 8             <!-- 声明自定义拦截器 -->
 9             <interceptor name="loginInterceptor" class="com.bjsxt.util.LoginInterceptor"></interceptor>[A2] 
10             <!-- 自定义拦截器栈 -->
11             <interceptor-stack name="mystack">
12                 <interceptor-ref name="defaultStack"></interceptor-ref>
13                 <interceptor-ref name="loginInterceptor"></interceptor-ref>
14             </interceptor-stack>
15         </interceptors>
16     
17         <!-- 全局的跳转结果 -->
18         <global-results>
19             <result name="login">WEB-INF/jsp/login.jsp</result>
20         </global-results>
21     
22         <action name="userAction_*" class="com.bjsxt.action.UserAction"
23                 method="{1}">
24             <!-- 引用自定义拦截器栈 -->
25             <interceptor-ref name="mystack"></interceptor-ref>
26             <result name="input">/index.jsp</result>
27             <result>/index.jsp</result>
28             <result name="show">WEB-INF/jsp/show.jsp</result>
29         </action>
30         <action name="defAction">
31             <result>WEB-INF/jsp/show.jsp</result>
32             <!-- 引用自定义拦截器栈 -->
33             <interceptor-ref name="mystack"></interceptor-ref>
34         </action>
35     </package>
36 </struts>