Servlet Filter 中init和destroy问题

测试源码如下：

 1 package com.FilterTest.Filter;
 2
 3 import java.io.IOException;
 4
 5 import javax.servlet.Filter;
 6 import javax.servlet.FilterChain;
 7 import javax.servlet.FilterConfig;
 8 import javax.servlet.ServletException;
 9 import javax.servlet.ServletRequest;
10 import javax.servlet.ServletResponse;
11
12 public class TestFilter implements Filter {
13
14     @Override
15     public void init(FilterConfig filterConfig) throws ServletException {
16         print("init");
17     }
18
19     @Override
20     public void doFilter(ServletRequest request, ServletResponse response,
21             FilterChain chain) throws IOException, ServletException {
22         print("do filter");
23         chain.doFilter(request, response);
24         print("do filter End!");
25     }
26
27     @Override
28     public void destroy() {
29         print("destory!");
30     }
31
32     void print(String info){
33         System.out.println(info+" Thread Name:"+Thread.currentThread().getName());
34     }
35 }

访问首页后调试控制台输出：

未有init初始化和destroy销毁操作，暂时无解。