多個Filter的執行具體情況

今天無意間看到一個博友寫了filter執行情況。 我覺得他這個圖畫得很好。經過修改，就在此收藏一下吧。為了以後方便查閱。

[img]/upload/attachment/98065/55bb5861-f89b-33d1-b389-880479187d49.jpg[/img]

public class TestFilter implements Filter {  

    public void doFilter(ServletRequest request, ServletResponse response, 
      FilterChain chain) throws IOException, ServletException {  
        //Code1 begin
        System.out.println("before invoke Filter's chain.doFilter() ..");  
        //Code1 end

        chain.doFilter(request, response);  

        //Code2 begin
        System.out.println("after invoke Filter's chain.doFilter() ..");  
        //Code2 end
    }

    public void init(FilterConfig filterConfig) throws ServletException {  
         System.out.println("Filter init()...");  
    }  
    public void destroy() {  

    }

}