Struts2自定义拦截器实例—Session超时的处理

版本:struts2.1.6

实例功能：当用户登陆后，session超时后则返回到登陆页面重新登陆。

为了更好的实现此功能我们先将session失效时间设置的小点，这里我们设置成1分钟

修改web.xml

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1. ?<session-config>??<session-timeout>1</session-timeout>??
2. </session-config>??

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此实例用到的jsp页面及登陆所涉及到的相关代码请参考：

Struts2自定义拦截器实例—登陆权限验证

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实现自定义拦截器类

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1. package?com.ywjava.interceptor;????
2. import?java.util.Map;????
3. import?com.opensymphony.xwork2.Action;??import?com.opensymphony.xwork2.ActionContext;??
4. import?com.opensymphony.xwork2.ActionInvocation;??import?com.opensymphony.xwork2.interceptor.AbstractInterceptor;??
5. import?com.ywjava.action.LoginAction;??import?com.ywjava.utils.Constants;??
6. ??public?class?SessionIterceptor?extends?AbstractInterceptor?{??
7. ??????@Override??
8. ????public?String?intercept(ActionInvocation?actionInvocation)?throws?Exception?{??????????ActionContext?ctx?=?ActionContext.getContext();??
9. ????????Map?session?=?ctx.getSession();??????????Action?action?=?(Action)?actionInvocation.getAction();??
10. ????????if?(action?instanceof?LoginAction)?{??????????????return?actionInvocation.invoke();??
11. ????????}??????????String?userName?=?(String)?session.get(Constants.USER_SESSION);??
12. ????????if?(userName?==?null)?{??????????????return?Action.LOGIN;??
13. ????????}?else?{??????????????return?actionInvocation.invoke();??
14. ????????}??????}??
15. ??}??

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struts.xml中定义并使用此拦截器

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1. <?xml?version="1.0"?encoding="UTF-8"?>??<!DOCTYPE?struts?PUBLIC??
2. ????"-//Apache?Software?Foundation//DTD?Struts?Configuration?2.1//EN"??????"http://struts.apache.org/dtds/struts-2.1.dtd">??
3. <struts>??????<package?name="authority"?extends="struts-default">??
4. ??????????????<!--?定义一个拦截器?-->??
5. ????????<interceptors>??????????????<interceptor?name="authority"??
6. ????????????????class="com.ywjava.interceptor.LoginInterceptor">??????????????</interceptor>??
7. ????????????<interceptor?name="sessionout"???????????????class="com.ywjava.interceptor.SessionIterceptor"></interceptor>??
8. ????????????<!--?拦截器栈?-->??????????????<interceptor-stack?name="mydefault">??
9. ????????????????<interceptor-ref?name="defaultStack"?/>??????????????????<interceptor-ref?name="authority"?/>??
10. ????????????????<interceptor-ref?name="sessionout"/>??????????????</interceptor-stack>??
11. ????????</interceptors>????
12. ????????<!--?定义全局Result?-->??????????<global-results>??
13. ????????????<!--?当返回login视图名时，转入/login.jsp页面?-->??????????????<result?name="login">/login.jsp</result>??
14. ????????</global-results>????
15. ????????<action?name="loginform"??????????????class="com.ywjava.action.LoginFormAction">??
16. ????????????<result?name="success">/login.jsp</result>??????????</action>??
17. ??????????????????<action?name="login"?class="com.ywjava.action.LoginAction">??
18. ????????????<result?name="success">/welcome.jsp</result>??????????????<result?name="error">/login.jsp</result>??
19. ????????????<result?name="input">/login.jsp</result>??????????</action>??
20. ??????????<action?name="show"?class="com.ywjava.action.ShowAction">??
21. ????????????<result?name="success">/show.jsp</result>??????????????<!--?使用此拦截器?-->??
22. ????????????<interceptor-ref?name="mydefault"?/>??????????</action>??
23. ??????????????</package>??
24. </struts>??

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当我们登陆后一分钟不做任何操作刷新后则会跳转到登陆页面