SPRINGMVC3 interceptors, filtering Ajax requests, judging user logins, blocking rule settings

Web. XML settings: (/block all requests)

<servlet>    <Servlet-name>Dispatcher</Servlet-name>    <Servlet-class>Org.springframework.web.servlet.DispatcherServlet</Servlet-class>    <Init-param>        <Param-name>Contextconfiglocation</Param-name>        <Param-value>/web-inf/dispatcher.xml</Param-value>    </Init-param>    <Load-on-startup>1</Load-on-startup></servlet> <servlet-mapping>    <Servlet-name>Dispatcher</Servlet-name>    <!--All requests will be handled by Dispatcherservlet. -    <Url-pattern>/</Url-pattern></servlet-mapping> 

Spring MVC profile Interception rule settings (no matches will not be intercepted):

<!--Configure interceptors, multiple interceptors, sequential execution -      <mvc:interceptors>            <Mvc:interceptor>                <!--The URL path is matched, and if not configured or/**, all controllers will be blocked -              <mvc:mappingPath="/" />              <mvc:mappingPath= "/account/**" />  <!--Intercepting user Paths -            <mvc:mappingPath= "/image/**" />  <!--Chip Management Path -            <mvc:mappingPath= "/upload/**" />  <!--download path for blocking tablets -            <Beanclass= "Com.wzw.interceptor.LoginInterceptor"></Bean>    <!--Custom Interceptor Path -        </Mvc:interceptor>          <!--when multiple interceptors are set, the Prehandle method is called sequentially and then the Posthandle and Aftercompletion methods of each interceptor are called in reverse order -      </mvc:interceptors>  

Interceptor Code:

 PackageCom.wzw.interceptor;Importjavax.servlet.http.HttpServletRequest;ImportJavax.servlet.http.HttpServletResponse;ImportOrg.springframework.web.servlet.ModelAndView;ImportOrg.springframework.web.servlet.handler.HandlerInterceptorAdapter;ImportCom.wzw.entity.Account; Public classLogininterceptorextendshandlerinterceptoradapter{/*** Called before the business processor processes the request * if return false * Aftercompletion () from the current interceptor to execute all interceptors, then exit the Interceptor chain * if True       * Execute the next interceptor until all the interceptors have been executed * and then execute the intercepted controller * and then enter the Interceptor chain, * back from the last interceptor to perform all Posthandle () * Then go back from the last interceptor to execute all aftercompletion ()*/@Override Public BooleanPrehandle (httpservletrequest request, httpservletresponse response, Object handler)throwsException {String RequestUri= Request.getrequesturi ();//request full path, can be used to jump after loginString ContextPath = Request.getcontextpath ();//full path under ProjectString url = requesturi.substring (Contextpath.length ());//Request PageSystem.out.print ("Interception occurred ..."); System.out.println ("From:" +requesturi+ "Request"); Account User= (account) request.getsession (). getattribute (' account '); if(User = =NULL){//determine if the user exists, there is no return login interface, continue to intercept, exist through interception, release to the access page            /*** Intercept directory requests, whether for AJAX requests * Yes: no login required, direct access (because I am the Ajax login request for the home page) * No: Skip to login screen */            if(Request.getheader ("X-requested-with")! =NULL&& Request.getheader ("X-requested-with"). Equalsignorecase ("XMLHttpRequest"))){                 //if it is an AJAX request, the response header will have, X-requested-withSystem.out.print ("An AJAX request has occurred ..."); return true; //Response.setheader ("Sessionstatus", "timeout");//setting the session status in the response header}Else{System.out.print ("Back home ..."); Request.getrequestdispatcher ("/index.do"). Forward (request, response);//forward to login interface            }              return false; }Else              return true; }            /*** After the business processor processes the request execution, the actions performed before the view is generated * can include data in the Modelandview, such as the current time*/@Override Public voidPosthandle (httpservletrequest request, httpservletresponse response, Object handler, Mo Delandview Modelandview)throwsException {if(Modelandview! =NULL){//Join Current TimeModelandview.addobject ("var", "Test Posthandle"); }        }            /*** Called after dispatcherservlet complete processing of the request, can be used to clean up resources, etc. * * When an interceptor throws an exception, all interceptors are executed back from the current Interceptor Aftercompletion () */@Override Public voidaftercompletion (httpservletrequest request, httpservletresponse response, Object handler, Exception ex )                throwsException {}}

SPRINGMVC3 interceptors, filtering Ajax requests, judging user logins, blocking rule settings