在JSP中添加Expires或Cache-Control标头 [英] Add an Expires or a Cache-Control header in JSP

问题描述

如何在JSP中添加 Expires 或 Cache-Control 标头？我想在包含页面中为我的静态组件添加远期到期日期，例如图像，CSS和JavaScript文件。

How do you add an Expires or a Cache-Control header in JSP? I want to add a far-future expiration date in an include page for my static components such as images, CSS and JavaScript files.

推荐答案

要禁用JSP页面的浏览器缓存，请创建一个过滤器，它映射在 url-pattern *。jsp 并且基本上在 doFilter（）方法中执行以下操作：

To disable browser cache for JSP pages, create a Filter which is mapped on an url-pattern of *.jsp and does basically the following in the doFilter() method:

HttpServletResponse httpResponse = (HttpServletResponse) response;
httpResponse.setHeader("Cache-Control", "no-cache, no-store, must-revalidate"); // HTTP 1.1
httpResponse.setHeader("Pragma", "no-cache"); // HTTP 1.0
httpResponse.setDateHeader("Expires", 0); // Proxies.

这样你就不需要在所有JSP页面上对它进行复制，并用来混淆它们scriptlets 。

This way you don't need to copypaste this over all JSP pages and clutter them with scriptlets.

要为CSS和JS等静态组件启用浏览器缓存，请将它们全部放在像 / static <这样的公共文件夹中/ code>或 / resources 并创建一个过滤器，它映射在上url-pattern of / static / * 或 / resources / * 基本上是在 doFilter（）方法中跟随：

To enable browser cache for static components like CSS and JS, put them all in a common folder like /static or /resources and create a Filter which is mapped on an url-pattern of /static/* or /resources/* and does basically the following in the doFilter() method:

httpResponse.setDateHeader("Expires", System.currentTimeMillis() + 604800000L); // 1 week in future.

参见：

• 确保所有浏览器都不会缓存网页。


• Web应用程序性能提示和技巧。

• Making sure a web page is not cached, across all browsers.
• Webapplication performance tips and tricks.

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