cachecontrolfilter.java

oa办公系统

/**
 * FileName:CacheControlFilter.java,v 1.0 created in 2008-11-6 上午11:04:01
 * Created by sean
 * Copyright (c) 2008 wanczy
 * All Rights Reserved.
 */
package cn.jx.ecjtu.oa.common.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;

/**
 * 处理客户端浏览器不要缓存页面信息。
 * @author sean
 * @version $Revision: 1.1 $
 * @since 1.0
 */
public class CacheControlFilter implements Filter {

	/* (non-Javadoc)
	 * @see javax.servlet.Filter#destroy()
	 */
	public void destroy() {
		// TODO Auto-generated method stub

	}

	/* (non-Javadoc)
	 * @see javax.servlet.Filter#doFilter(javax.servlet.ServletRequest, javax.servlet.ServletResponse, javax.servlet.FilterChain)
	 */
	public void doFilter(ServletRequest request, ServletResponse response,
			FilterChain chain) throws IOException, ServletException {
		HttpServletResponse resp=(HttpServletResponse)response;
		/*
		 * 设置缓存控制的响应头，使浏览器不缓存当前界面。
		 */
		resp.setHeader("pragma", "no-cache");
		resp.setHeader("cache-control", "no-cache");
		resp.setHeader("expires", "0");
		chain.doFilter(request, response);//将请求处理传递给下一环节

	}

	/* (non-Javadoc)
	 * @see javax.servlet.Filter#init(javax.servlet.FilterConfig)
	 */
	public void init(FilterConfig config) throws ServletException {
		// TODO Auto-generated method stub

	}

}