通过java启用浏览器缓存

发布于 2024-07-26 02:29:56 字数 1422 浏览 5 评论 0原文

美好的一天，

我正在使用 CacheFilter 过滤到我的服务器的某个路径（它将图像流输出到响应流）。我在 web.xml 中对其进行了如下配置：

<filter>
    <filter-name>imagesCache</filter-name>
    <filter-class>com.samaxes.cachefilter.presentation.CacheFilter</filter-class>
    <init-param>
        <param-name>privacy</param-name>
        <param-value>public</param-value>
    </init-param>
    <init-param>
        <param-name>expirationTime</param-name>
        <param-value>2592000</param-value>
    </init-param>
</filter>

...
<filter-mapping>
    <filter-name>imagesCache</filter-name>
    <url-pattern>/my/path/*</url-pattern>
</filter-mapping>

使用我的 Firefox，如果我通过地址栏访问我的 url，它会第一次访问服务器，但在后续调用期间使用缓存。但是，如果网址位于我的页面内（即），它似乎总是会访问服务器。

[编辑] 经过几次测试后，通过地址栏访问我的图像并不总是有效。但缓存似乎确实比 . 至于是否真的，我不确定。

附加信息：我的路径类似于 /my/path?then=some&query=strings。请注意，它没有扩展名（即 gif、png、jpeg ），但它的 mimetype 设置正确（ image/gif、image/png、image/jpeg ）。我不确定缺少扩展名或查询字符串的存在是否有任何影响。（另外，还有一点。虽然我的 url 有查询字符串，但我在测试中一遍又一遍地使用相同的 uri + 查询字符串）。

有什么想法吗？

谢谢

原文

Good day,

I am using CacheFilter to filter a certain path to my server (which outputs an image stream to the response stream). And I've configured it in my web.xml as follows:

<filter>
    <filter-name>imagesCache</filter-name>
    <filter-class>com.samaxes.cachefilter.presentation.CacheFilter</filter-class>
    <init-param>
        <param-name>privacy</param-name>
        <param-value>public</param-value>
    </init-param>
    <init-param>
        <param-name>expirationTime</param-name>
        <param-value>2592000</param-value>
    </init-param>
</filter>

...
<filter-mapping>
    <filter-name>imagesCache</filter-name>
    <url-pattern>/my/path/*</url-pattern>
</filter-mapping>

Using my firefox, if I access my url via the address bar, it hits the server the first time but uses the cache during succeeding calls. However, if the url is inside my page ( i.e. <img src="..."/> ), it seems to hit the server all the time.

[EDIT] After a few more testing, accessing my image via the address bar does not work all the time. But caching does seem to work more often with it than . As to whether it really, I am not sure.

Additional Info:
my path is something like /my/path?then=some&query=strings. Notice that it doesn't have an extension (i.e. gif, png, jpeg ) but it's mimetype is set properly ( image/gif, image/png, image/jpeg ). I am not sure if the lack of extension or the presence of the query strings have any impact. (Also, another note. though my url have query strings, I am using the same uri + query string over and over again with my tests).

Any ideas why?

Thanks

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