有哪些优点/注释（非编译器）的缺点相比，XML配置文件 [英] What are the Pros/Cons of Annotations (non-compiler) compared to xml config files

问题描述

当我看着像Hibernate，JPA或Spring的Java框架，我通常让我的配置通过XML文件或者直接把批注在我的课的可能性。

When I look at Java frameworks like Hibernate, JPA, or Spring, I usually have the possibility to make my configuration via an xml-file or put annotations directly in my classes.

我cosistently问自己，我应该去什么样的方式。

I am cosistently asking myself what way should I go.

当我使用注解，我有类和它的配置在一起，但与XML，我得到我的系统的一个更大的图片，因为我可以看到所有类的配置。

When I use annotations, I have the class and its configuration together but with an xml I get a bigger picture of my system because I can see all class-configurations.

注解也被编译在某些方面我想，这应该是比解析XML更快，但另一方面，如果我想改变我的配置我不得不重新编译它，而不是只是改变了xml文件（这可能成为客户端的生产环境）更加得心应手。

Annotations also get compiled in some way I guess and it should be quicker than parsing the xml, but on the other hand, if I want to change my configuration I have to recompile it instead of just changing the xml file (which might become even more handy for production environments on customer side).

所以，看我点的时候，我倾向于去了XML的方式。但在平时使用注解。论坛或教程看时

So, when looking at my points, I tend to go the xml-way. But when looking at forums or tutorials usually annotations are used.

你有什么利弊？

推荐答案

一个好的经验法则：任何你可以看到自己想要更改，恕不一个完整的重新部署（例如，调整性能参数）应该去的东西软配置如XML文件。什么是现实永远不会改变 - 或者只是在排序，在那里你会也不得不改变code的情况 - 可以合理地在注释

A good rule of thumb: anything you can see yourself wanting to change without a full redeploy (e.g. tweaking performance parameters) should really go in something "soft-configurable" such as an XML file. Anything which is never realistically going to change - or only in the sort of situation where you'll be having to change the code anyway - can reasonably be in an annotation.

忽略的注释和XML之间的性能差异的任何想法 - 除非你的配置是绝对的大规模的区别将是微不足道的。

Ignore any ideas of performance differences between annotations and XML - unless your configuration is absolutely massive the difference will be insignificant.

这是灵活性和可读性集中注意力。

Concentrate on flexibility and readability.

这篇关于有哪些优点/注释（非编译器）的缺点相比，XML配置文件的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！