springmvc interceptors and concepts, configuration! ! !

For intercepting the request, and then filtered interception

 

Implement HandlerInterceptor Interface

Configuring interceptors

Package cn.zys.lanjieqi; 



Import the javax.servlet.http.HttpServletRequest;
 Import javax.servlet.http.HttpServletResponse; 

Import org.springframework.web.servlet.HandlerInterceptor;
 Import org.springframework.web.servlet.ModelAndView; 


public  class MyZhujieqi the implements HandlerInterceptor from {
     // performed prior to the request processing method
     // if true execute a return next interceptor
     // if false is returned to the next is not 
    @Override
     public  Boolean the preHandle (the HttpServletRequest request, Response the HttpServletResponse, Object Handler)
             throws Exception {
        // the TODO Auto-Generated Stub Method 
        System.out.println ( "pretreatment ~ ~" );
         return  to true ; 
    } 
    
    
    // performed after the request processing method 
    @Override
     public  void The postHandle (the HttpServletRequest Request, Response the HttpServletResponse, Object Handler, 
            ModelAndView ModelAndView) throws Exception {
         // the TODO Auto-Generated Stub Method 
        System.out.println ( "post-processing ~ ~" ); 
        HandlerInterceptor from. Super .postHandle (Request, Response, Handler, ModelAndView); 
    } 
    
    
    // perform post-processing DispatcherServlet - - suitable to do some cleanup work
    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex)
            throws Exception {
        // TODO Auto-generated method stub
        HandlerInterceptor.super.afterCompletion(request, response, handler, ex);
    }
    
}

 

 

Configuration mvc.xml

<! - configuration interceptor -> 
    < MVC: interceptors > 
    <! - the configuration of an interceptor -> 
        < : MVC Interceptor > 
        <! - / ** all sub-paths that path -> 
            < MVC: Mapping path = "/ **" /> 
            < the bean class = "cn.zys.lanjieqi.MyZhujieqi" > </ the bean > 
        </ MVC: Interceptor > 
    </ MVC: interceptors >