Filter指定浏览器来缓存或不缓存服务器数据

转载：

http://elan1986.iteye.com/blog/1409504

Filter指定浏览器来缓存或不缓存服务器数据

博客分类： 
• 后台

responseheaderfilterjavacache

import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;
import java.util.*;
public class ResponseHeaderFilter implements Filter {
  FilterConfig fc;
  public void doFilter(ServletRequest req, ServletResponse res,
                      FilterChain chain) throws IOException,ServletException {
     HttpServletResponse response = (HttpServletResponse) res;
     for (Enumeration e=fc.getInitParameterNames(); e.hasMoreElements();) {
        String headerName = (String)e.nextElement();
        response.addHeader(headerName, fc.getInitParameter(headerName));
     }
    chain.doFilter(req, response);
  }

  public void init(FilterConfig filterConfig) {
    this.fc = filterConfig;
  }

  public void destroy() {
    this.fc = null;
  }
}

缓存 

<filter>
   <filter-name>ResponseHeaderFilter</filter-name>
   <filter-class>com.jspbook.ResponseHeaderFilter</filter-class>
   <init-param>
     <param-name>Cache-Control</param-name>
     <param-value>max-age=3600</param-value>
   </init-param>
 </filter>
 <filter-mapping>
   <filter-name>ResponseHeaderFilter</filter-name>
   <url-pattern>/logo.png</url-pattern>
 </filter-mapping>

不缓存 

<filter>
  <filter-name>ResponseHeaderFilter</filter-name>
  <filter-class>com.jspbook.ResponseHeaderFilter</filter-class>
  <init-param>
    <param-name>Cache-Control</param-name>
    <param-value>private,no-cache,no-store</param-value>
   </init-param>
</filter>