Question

我有一个使用GWT & SmartGWT开发的应用程序。目前主机页面已缓存在浏览器中，我不想这样做。我想阻止主页（html页面）不要在浏览器中缓存。我尝试添加一些标签

 <meta http-equiv="Cache-Control" content="no-cache, no-store, must-revalidate"/>
 <meta http-equiv="Pragma" content="no-cache"/>
 <meta http-equiv="Expires" content="0"/>

如何实现这一点。任何想法？

Answer 1

试试这个：

<meta http-equiv="cache-control" content="max-age=0" />
<meta http-equiv="cache-control" content="no-cache" />
<meta http-equiv="expires" content="0" />
<meta http-equiv="expires" content="Tue, 01 Jan 1980 1:00:00 GMT" />
<meta http-equiv="pragma" content="no-cache" />

Answer 2

您确定，缓存的“主页”存在问题，而不是缓存的javascript？

如果html页面确实存在问题，您可以在Web服务器中添加必要的标题。

如果使用“ nochache ”名称缓存javascript文件时出现问题，标准解决方案是在web.xml中添加过滤器。

Answer 3

下面是Filter类，以防止从GWT编译器缓存 nochache 文件。将index.html添加到if语句并在web.xml中激活Filter

import java.io.IOException;
import java.util.Date;

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;

/**
 * {@link Filter} to add cache control headers for GWT generated files to ensure
 * that the correct files get cached.
 * 
 * @author See Wah Cheng
 * @created 24 Feb 2009
 */
public class GWTCacheControlFilter implements Filter {

 public void destroy() {
 }

 public void init(FilterConfig config) throws ServletException {
 }

 public void doFilter(ServletRequest request, ServletResponse response, FilterChain filterChain) throws IOException,
   ServletException {

  HttpServletRequest httpRequest = (HttpServletRequest) request;
  String requestURI = httpRequest.getRequestURI();

  if (requestURI.contains(".nocache.")) {
   Date now = new Date();
   HttpServletResponse httpResponse = (HttpServletResponse) response;
   httpResponse.setDateHeader("Date", now.getTime());
   // one day old
   httpResponse.setDateHeader("Expires", now.getTime() - 86400000L);
   httpResponse.setHeader("Pragma", "no-cache");
   httpResponse.setHeader("Cache-control", "no-cache, no-store, must-revalidate");
  }

  filterChain.doFilter(request, response);
 }

如何防止在GWT应用程序中缓存HTML页面

3 个答案: