如何定义< welcome-file-list>和< error-page>在servlet 3.0的web.xml中？ [英] How to define <welcome-file-list> and <error-page> in servlet 3.0's web.xml-less?

问题描述

我有现有的web-app，我想将其转换为web.xml-less servlet 3.0。我已经设法使它工作，但是web.xml中有2个标签，我仍然不知道web.xml-less环境中的等效代码。

I have existing web-app which I want to convert into web.xml-less of servlet's 3.0. I've managed to make it working, however there are 2 tags in web.xml which I still don't know the equivalent code in web.xml-less environment.

<welcome-file-list>
    <welcome-file>/index.jsp</welcome-file>
</welcome-file-list>

<error-page>
    <error-code>404</error-code>
    <location>/pageNotFound</location>
</error-page>

感谢任何帮助

推荐答案

在Servlets 3.0中，在很多情况下你不需要web.xml，但是，有时它是必需的或者只是有用的。您的案例只是其中之一 - 没有特殊的注释来定义欢迎文件列表或错误页面。

In Servlets 3.0 you don't need a web.xml for many cases, however, sometimes it's required or just useful. Your case is just one of them - there is no special annotations to define welcome-file list or error-pages.

另一件事是 - 你真的想拥有它们吗？硬编码？基于注释/程序的配置和XML中的声明性配置有一些有效的用例。转移到Servlets 3.0并不一定意味着不惜一切代价摆脱web.xml。

Another thing is - would you really like to have them hardcoded? There are some valid use-cases for annotation / programmatic based configuration and for declarative configuration in XML. Moving to Servlets 3.0 doesn't necessarily means getting rid of web.xml at all cost.

我会发现你发布的条目是XML中更好的配置示例。首先 - 它们可以从部署更改为部署，其次 - 它们会影响整个应用程序，而不会影响任何特定的Servlet。

I would find the entries you posted a better example of configuration in XML. Firstly - they can be changed from deployment to deployment and secondly - they affect whole application and not any particular Servlet.

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