Java小程序不缓存 [英] Java Applet not caching

问题描述

我有一个Java小程序的问题我已经部署了拒绝在JVM的粘性缓存到缓存（或浏览器）。对于每一个用户加载页面此applet是，在JVM重新下载​​从导致长时间的延迟，服务器jar文件的时间有些道理的。

正在通过互联网访问包含applet的网页，所以根据的 我使用Sun公司的Java小程序文件的＆LT;小程序＆GT; 标签，而不是＆LT;对象＆gt; 或＆LT;嵌入方式＆gt; 标签

任何帮助调试或识别问题会大大AP preciated。

下面是我使用的是全小程序标记：

 ＆LT;小程序ALT =扫描小程序加载失败档案=scanning.jar
        code =scanning.scanlet.classcodeBase类=/ JAVA /codeTYPE =应用程序/ JAVA
        高度=30MAYSCRIPT =真NAME =scanletWIDTH =200＆GT;
    ＆LT; PARAM NAME =域值=192.168.12.23/＆GT;
    ＆LT; PARAM NAME =publishNameVALUE =scan_attachment/＆GT;
    ＆LT; PARAM NAME =publishURLVALUE =htt​​p://192.168.12.23/draft/update/52/＆GT;
    ＆LT; PARAM NAME =curURLVALUE =htt​​p://192.168.12.23/draft/edit/52/＆GT;您的浏览器无法处理在Java和放大器; LT; APPLET＆放大器; GT;标签需要显示该applet
＆LT; BR /＆GT;
一个解决办法是下载一个更好的网页浏览器一样
＆LT; A HREF =htt​​p://www.mozilla.com/firefox＆GT; Mozilla的Firefox＆LT; / A＆GT;＆LT; /小程序＆GT;
 

解决方案

我有同样的问题，发现需要应用服务器端的把戏。如此看来，如果他们的MIME类型是不正确的罐子不缓存。使用应用程序/ Java的存档MIME类型，请检查您的服务器的回复。

我发现的另一个问题是与特定罐子。我的归档参数已上市多罐，但只有少数被缓存。我发现，高达一个特定的地方缓存的所有罐子，所有剩余的罐子并没有缓存的。
当装载的小程序，我$ P $在其Java控制台pssed5，刚刚过去的缓存罐子后发现，这条消息：缓存：进入签约罐子从失踪。我仍然不知道什么是错的这个文件，但是我感动的是罐子在归档参数列表的末尾。此固定的问题。

I'm having a problem with a Java applet I've deployed that is refusing to be cached in the jvm's "sticky" cache (or by the browser). For some reason every time a user loads the page this applet is on, the jvm re-downloads the jar file from the server which causes a long delay.

The webpage containing the applet is being accessed via the internet, so according to Sun's Java applet documentation I'm using an <applet> tag rather than an <object> or <embed> tag.

Any help debugging or identifying the problem would be much appreciated.

Below is the full applet tag I'm using:

<applet alt="Scanning Applet failed to load" archive="scanning.jar"
        code="scanning.scanlet.class" codebase="/java/" codetype="application/java"
        height="30" mayscript="True" name="scanlet" width="200">
    <param name="domain" value="192.168.12.23" />
    <param name="publishName" value="scan_attachment" />
    <param name="publishURL" value="http://192.168.12.23/draft/update/52" />
    <param name="curURL" value="http://192.168.12.23/draft/edit/52" />

Your browser is unable to process the Java &lt;APPLET&gt; tag needed to display this applet
<br />
One solution would be to download a better web browser like
<a href="http://www.mozilla.com/firefox">Mozilla's Firefox</a>

</applet>

解决方案

I had the very same problem and found a trick that need to be applied server side. It seems that jars aren't cached if their mime type is incorrect. Please check your server reply using the application/java-archive mime type.

Another problem I found is related to a specific jar. My archive parameter was listing many jars, but only a few were cached. I found that all jars upto a specific one where cached, all remaining jars weren't cached at all. While loading applet, I pressed "5" in its java console and found this message just after the last cached jar: cache: signed entry missing from jar . I still don't know what is wrong with this file, but I moved that jar at the end of the archive parameter list. This "fixed" the problem.

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