JSP页面已缓存，无法更改，tomcat [英] JSP page is cached, can not change it, tomcat

问题描述

我有一个Java服务器，当我在JSP代码中进行更改时，又从浏览器再次调用该页面，则未显示我的更改，该服务器返回了旧的JSP.

I have a java server, when I change something within the JSP code, and I call the page again from the browser, my changes are not shown, the server returns the old JSP.

有人知道为什么吗?

推荐答案

《 Jasper操作方法》 在conf/web.xml中告诉您，对于您的org.apache.jasper.servlet.JspServlet，您需要:

The Jasper How-to tells that in conf/web.xml, for your org.apache.jasper.servlet.JspServlet you need:

• development-Jasper是否在开发模式下使用?如果为true，则可以通过ModifyTestInterval参数指定检查JSP的频率.true或false，默认为true.
• checkInterval-如果development为false并且checkInterval大于零，则启用后台编译. checkInterval是两次检查是否需要重新编译JSP页面(及其相关文件)之间的时间(以秒为单位).默认值为0秒.

• development - Is Jasper used in development mode? If true, the frequency at which JSPs are checked for modification may be specified via the modificationTestInterval parameter.true or false, default true.
• checkInterval - If development is false and checkInterval is greater than zero, background compiles are enabled. checkInterval is the time in seconds between checks to see if a JSP page (and its dependent files) needs to be recompiled. Default 0 seconds.

<Context>元素具有以下属性:

The <Context> element has the following properties:

• reloadable-如果要除jsp文件之外还热部署类和库，则设置为true
• antiResourceLocking-应该为假

• reloadable - set to true if you want hot-deployment of classes and libs in addition to jsp files
• antiResourceLocking - should be false

以上所有都是关于服务器的.客户端缓存是您可能看不到较新版本的页面的另一个原因.只需按CTRL + R/CTRL + F5通常就足够了.

All the above was about the server. Client-side caching is another reason why you may not see newer version of pages. Simply hitting CTRL+R / CTRL + F5 often suffices.

决定缓存策略是不同的，也是一个不同的主题-您将告诉浏览器缓存哪些资源以及持续多长时间.最好将缓存标头-Expires和Cache-Control(和Pragma)放在应用程序中的公共位置，以便可以快速更改它.

Deciding your cache strategy is something different, and a different topic - what resources would you tell the browser to cache, and for how long. Preferably you should put the cache headers - Expires and Cache-Control (and Pragma) in a common location in your application, where you can change it quickly.

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