我设置缓存选项为我的图像时,struts2有奇怪的丢弃行为。Struts 2丢弃缓存标题
我试图把图片从数据库将在客户端缓存 要渲染的图像我使用(http://struts.apache.org/2.x/docs/how-can-we-display-dynamic-or-static-images-that-can-be-provided-as-an-array-of-bytes.html),其中特殊结果类型呈现如下:
public void execute(ActionInvocation invocation) throws Exception {
...//some preparation
HttpServletResponse response = ServletActionContext.getResponse();
HttpServletRequest request = ServletActionContext.getRequest();
ServletOutputStream os = response.getOutputStream();
try
{
byte[] imageBytes = action.getImage();
response.setContentType("image/gif");
response.setContentLength(imageBytes.length);
//I want cache up to 10 min
Date future = new Date(((new Date()).getTime() + 1000 * 10*60l));
;
response.addDateHeader("Expires", future.getTime());
response.setHeader("Cache-Control", "max-age=" + 10*60 + "");
response.addHeader("cache-Control", "public");
response.setHeader("ETag", request.getRequestURI());
os.write(imageBytes);
}
catch(Exception e)
{
response.sendError(HttpServletResponse.SC_NOT_FOUND);
}
os.flush();
os.close();
}
但是,当图像嵌入到网页它总是重载(萤火虫显示代码200),和没有到期,也没有最大年龄在头部
Host localhost:9090
Accept image/png,image/*;q=0.8,*/*;q=0.5
Accept-Language en-us,en;q=0.5
Accept-Encoding gzip,deflate
Accept-Charset ISO-8859-1,utf-8;q=0.7,*;q=0.7
Keep-Alive 300
Connection keep-alive
Referer http://localhost:9090/web/result?matchId=1
Cookie JSESSIONID=4156BEED69CAB0B84D950932AB9EA1AC;
If-None-Match /web/_srv/teamcolor
Cache-Control max-age=0
介绍我不知道它为什么dissapered,可在网址的问题?它是带参数的形式:
http://localhost:9090/web/_srv/teamcolor?loginId=3
不幸的是结果是相同的 - 这意味着拦截器和结果类型都不会影响头。它由支柱携带 – Dewfy 2010-05-25 14:44:02