让jsp页面不被浏览器缓存

后果：使得点击阅读器后退，阅读器从缓存中找不到页面， 从而会重新要求服务器。
过滤器：

package 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.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class NoCacheFilter implements Filter {


    public void doFilter(ServletRequest req, ServletResponse resp,
            FilterChain chain) throws IOException, ServletException {
        //把ServletRequest强转成HttpServletRequest
        HttpServletRequest request = (HttpServletRequest) req;
        //把ServletResponse强转成HttpServletResponse
        HttpServletResponse response = (HttpServletResponse) resp;
        //制止阅读器缓存所有动态页面
        response.setDateHeader("Expires", -1);
        response.setHeader("Cache-Control", "no-store");
        response.setHeader("Pragma", "no-cache");
        chain.doFilter(request, response);
    }

    public void init(FilterConfig filterConfig) throws ServletException {

    }
    
    public void destroy() {
        
    }
}

packa