禁用浏览器缓存的过滤器

代码如下：

过滤器代码

package filter;
public class NoCacheFilter implements Filter {

@Override
public void init(FilterConfig filterConfig) throws ServletException {}

@Override
public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain)
throws IOException, ServletException {
HttpServletRequest httpServletRequest = (HttpServletRequest) request;
HttpServletResponse httpServletResponse = (HttpServletResponse) response;
httpServletResponse.setDateHeader("Expires", -1);
httpServletResponse.setHeader("Cache-Control", "no-cache");
httpServletResponse.setHeader("Pragma", "no-cache");
chain.doFilter(httpServletRequest, httpServletResponse);

}

@Override
public void destroy() {}

}

在web.xml中配置

<filter>
<filter-name>noCacheFilter</filter-name>
<filter-class>filter.NoCacheFilter</filter-class>
</filter>
<filter-mapping>
<filter-name>noCacheFilter</filter-name>
<url-pattern>要过滤的页面</url-pattern>
</filter-mapping>

　　下面三行代码都可以禁止浏览器缓存当前页面，但是并不是所有的浏览器都能完全支持其中的三个响应头， 因此最好是同时使用这三行代码。

httpServletResponse.setDateHeader("Expires", -1);
httpServletResponse.setHeader("Cache-Control", "no-cache");
httpServletResponse.setHeader("Pragma", "no-cache");