package demo;

 

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;

import javax.servlet.http.HttpServletRequest;

 

public class HelloFilter implements Filter {

 

        @Override

        public void init(FilterConfig arg0) throws ServletException {

                System.out.println("Filter 初始化");

        }

 

        @Override

        public void doFilter(ServletRequest req, ServletResponse res,

                        FilterChain chain) throws IOException, ServletException {

                HttpServletRequest request = (HttpServletRequest)req;

                System.out.println("拦截 URI="+request.getRequestURI());

                chain.doFilter(req, res);

        }

 

        @Override

        public void destroy() {

                System.out.println("Filter 结束");

        }