我設置緩存選項爲我的圖像時,struts2有奇怪的丟棄行爲。Struts 2丟棄緩存標題
我試圖把圖片從數據庫將在客戶端緩存 要渲染的圖像我使用(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),其中特殊結果類型呈現如下:
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,當圖像嵌入到網頁它總是重載(螢火蟲顯示代碼200),和沒有到期,也沒有最大年齡在頭部
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
介紹我不知道它爲什麼dissapered,可在網址的問題?它是帶參數的形式:
http://localhost:9090/web/_srv/teamcolor?loginId=3
不幸的是結果是相同的 - 這意味着攔截器和結果類型都不會影響頭。它由支柱攜帶 – Dewfy 2010-05-25 14:44:02