Servlet Filter 中init和destroy问题

测试源码如下：

 package com.FilterTest.Filter;

 import java.io.IOException;

 import javax.servlet.Filter;
 import javax.servlet.FilterChain;
 import javax.servlet.FilterConfig;
 import javax.servlet.ServletException;
 import javax.servlet.ServletRequest;
 import javax.servlet.ServletResponse;

 public class TestFilter implements Filter {

     @Override
     public void init(FilterConfig filterConfig) throws ServletException {
         print("init");
     }

     @Override
     public void doFilter(ServletRequest request, ServletResponse response,
             FilterChain chain) throws IOException, ServletException {
         print("do filter");
         chain.doFilter(request, response);
         print("do filter End!");
     }

     @Override
     public void destroy() {
         print("destory!");
     }

     void print(String info){
         System.out.println(info+" Thread Name:"+Thread.currentThread().getName());
     }
 }

访问首页后调试控制台输出：

init 和destroy在服务重启的时候执行，且只有一次：

访问主页后：

do filter Thread Name:http-nio-8081-exec-11
Second Filter----do Filter http-nio-8081-exec-11
Second Filter----do Filter End! http-nio-8081-exec-11
do filter End! Thread Name:http-nio-8081-exec-11
do filter Thread Name:http-nio-8081-exec-12
Second Filter----do Filter http-nio-8081-exec-12
Pages Filter----do Filter http-nio-8081-exec-12
Pages Filter----do Filter End! http-nio-8081-exec-12
Second Filter----do Filter End! http-nio-8081-exec-12
do filter End! Thread Name:http-nio-8081-exec-12

Filter是根据配置前后然后根据Servlet域大小来先后执行！