Java乔晓松-使用Filter过滤器清除网页缓存

package www.csdn.dbshop.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;import javax.servlet.http.HttpServletResponse;public class CacheFilter implements Filter {public void destroy() {System.out.println("缓存Filter------销毁操作");}public void doFilter(ServletRequest request, ServletResponse response,FilterChain chain) throws IOException, ServletException {System.out.println("清除缓存................");//response对象HttpServletResponse res = (HttpServletResponse) response;// 设定网页的到期时间，一旦过期则必须到服务器上重新调用res.setDateHeader("Expires", -1);// Cache-Control 指定请求和响应应遵循的缓存机制 no-cache指示请求或响应消息是不能缓存的res.setHeader("Cache-Control", "no-cache");// 用于设定禁止浏览器从本地缓存中调用页面内容，设定后一旦离开页面就无法从Cache中再调出res.setHeader("Pragma", "no-cache");// 放行chain.doFilter(request, res);}public void init(FilterConfig filterConfig) throws ServletException {System.out.println("初始化数据-----缓存清除");}}