禁用缓存的过滤器Filter

package com.atguigu.javaweb.cache;

import java.io.IOException;

import javax.servlet.FilterChain;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import com.atguigu.javaweb.HttpFilter;

public class NoCacheFilter extends HttpFilter {

    @Override
    public void doFilter(HttpServletRequest request,
            HttpServletResponse response, FilterChain filterChain)
            throws IOException, ServletException {
        
        System.out.println("cacheFilter's doFilter..");
        //主要是这三个方法：
        response.setDateHeader("Expires",-1);
        response.setHeader("Cache-Control","no-cache");
        response.setHeader("Pragma","no-cache");
        
        filterChain.doFilter(request, response);
    }

    

}