filter filter implements verification jump_return verification result

1. Requirement Background

You need to intercept a request url to simulate whether you can enter a certain interface. If the interception needs to return false data, don't ask me why I don't use the intercept interceptor.

2. web.xml

<filter>    
    <filter-name>restfulFilter</filter-name>    
    <filter-class>com.jeenotes.utils.filter.RestfulFilter</filter-class> 过滤器路径   
</filter>    

< filter-mapping >     
    < filter-name > restfulFilter </ filter-name >     
    < url-pattern > /aaa/* </ url-pattern >   aaa represents the intercepted url, if you want to intercept all, just /*.   
</ filter-mapping > 

 

3. Custom Filter

 public class RestfulFilter implements Filter { 

 private AAAService aaaService;
     @Override public void init(FilterConfig filterConfig) throws ServletException { }
 @Override public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
        
　　　　 //Because the filter priority is high, the direct @Autowired introduction of service does not exist 
 //The following is HttpServletRequest req = (HttpServletRequest)request; HttpServletResponse resp = (HttpServletResponse)response; ServletContext sc = req.getSession().getServletContext(); 
 //The following is the process of creating service XmlWebApplicationContext cxt = (XmlWebApplicationContext)WebApplicationContextUtils.getWebApplicationContext(sc); //aaaServiceImpl is the aaaService implementation class if(cxt != null && cxt.getBean("aaaServiceImpl") != null && aaaService == null) aaaService = (AAAService) cxt.getBean("aaaServiceImpl");
 // here is the logic
         if(success){ chain.doFilter(request, response); //Enter the requested url }else{ req.getRequestDispatcher("/xxx url").forward(request,response);//Jump to the url specified by yourself }
         }
 @Override public void destroy() { }
     }

/xxx url to jump to

@RequestMapping(value = "/getEntranceStatus", method = RequestMethod.GET, produces = "text/html;charset=UTF-8")
    public String getEntranceStatus(HttpServletRequest request){
    
       // here is to return a false
        
  }