J2EE中使用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 init(FilterConfig filterConfig) throws ServletException
 {
  System.out.println("初始化");
 }

 public void doFilter(ServletRequest request, ServletResponse response,FilterChain chain) throws IOException, ServletException
 {
  // 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 destroy()
 {
  System.out.println("销毁");
 }
}

原帖地址：http://blog.csdn.net/qxs965266509/article/details/8848856