Vaadin AbstractJavaScriptComponent：阻止浏览器javascript缓存 [英] Vaadin AbstractJavaScriptComponent: prevent browser javascript caching

问题描述

我的vaadin应用程序中有一个自定义javascript组件，扩展了 AbstractJavaScriptComponent 。

I have a custom javascript component in my vaadin application which extends AbstractJavaScriptComponent.

@JavaScript({"javaScriptConnector.js", "MyComp.js", "MyCompHtml.js"})
public class MyComp extends AbstractJavaScriptComponent {
.....
.....
}

每当我更改为 MyComp.js ，我需要清除浏览器缓存以查看更改。当我开发应用程序时，这是可以的，但是一旦应用程序上线，我无法要求我的用户清除缓存。

Whenever I do a change to MyComp.js, I need to clear my browser cache to see the change. This is ok when I develop the app, but I cannot ask my users to clear cache once the app goes live.

有没有办法防止浏览器缓存 MyComp.js ？我知道你在javascript中附加查询字符串的技巧（例如： MyComp.js？v = 1 ）但我不知道如何做到这一点vaadin AbstractJavaScriptComponent 。

Is there a way to prevent browser caching of MyComp.js? I am aware of the trick where you append a query string to the javascript (eg: MyComp.js?v=1) but I have no Idea how I can do that to the vaadin AbstractJavaScriptComponent.

推荐答案

我已经通过利用 resourceCacheTime Vaadin servlet配置的参数：

I have overcome this by utilising the resourceCacheTime parameter of the Vaadin servlet configuration:

@VaadinServletConfiguration（ui = MyUI.class， resourceCacheTime = 0）

请参阅 DefaultDeploymentConfiguration.class 关于默认值。

将此值设置为 0 添加以下响应标头：

Setting this value to 0 adds the following response header:

cache-control：public，max-age = 0，must-revalidate

指示缓存每次都重新验证此资源。

instructing caches to revalidate this resource every time.

com.vaadin.server.communication.PublishedFileHandler .handleRequest 是创建发布文件响应的位置。这里的问题是，这是所有已发布资源的全局设置，因此自定义此选项的唯一方法是创建已发布的文件处理程序。

com.vaadin.server.communication.PublishedFileHandler.handleRequest is where the published file response is created. The issue here is that this is a global setting for all published resources and so the only way to customise this would be to create your published file handler.

也许Vaadin会考虑在@Javascript / @ StyleSheet批注中添加另一个选项，以实现更具体的资源缓存时间。

Maybe Vaadin would consider adding another option to the @Javascript/@StyleSheet annotation to achieve a more specific resource cache time.

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