blocks|key|976720|text|我不是一个Play开发人员，但是Struts2也能够做到这一点，但是通过struts2-spring-plugin。因为类重载是由Spring提供的，所以任何项目都可以使用这个spring特性。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|976721|http://struts.apache.org/2.2.1/docs/spring-plugin.html在页面中搜索“类重新加载”。|offset|length|976722|entityMap|0|LINK|mutability|MUTABLE|url|http://struts.apache.org/2.2.1/docs/spring-plugin.html^0|0|0|1I|0|0^^$0|@$1|2|3|4|5|6|7|N|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|O|8|@]|9|@$D|P|E|Q|1|R]]|A|$]]|$1|F|3|-4|5|6|7|S|8|@]|9|@]|A|$]]]|G|$H|$5|I|J|K|A|$L|M]]]]

I'm not a Play developer however Struts2 is also capable of this but though the struts2-spring-plugin. Since the class reloading is provided by Spring it might be possible to use this spring feature by any project.

<a href="http://struts.apache.org/2.2.1/docs/spring-plugin.html" rel="nofollow">http://struts.apache.org/2.2.1/docs/spring-plugin.html</a>
Search the page for "Class Reloading".

blocks|key|976776|text|他们这样做的方式是使用一个自定义的类加载器来检测对源文件的更改，使用Eclipse+Java+Compiler编译这些文件，然后热插拔JVM中的适当类。如果你正在寻找类似的东西，请查看ZeroTurnaround的JRebel它不是免费的，但当你需要重新部署大型项目时，节省时间是非常值得的。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|976777|entityMap|0|LINK|mutability|MUTABLE|url|http://www.zeroturnaround.com/jrebel/^0|2Z|6|0|0^^$0|@$1|2|3|4|5|6|7|L|8|@]|9|@$A|M|B|N|1|O]]|C|$]]|$1|D|3|-4|5|6|7|P|8|@]|9|@]|C|$]]]|E|$F|$5|G|H|I|C|$J|K]]]]

The way they do it is by using a custom classloader that will detect changes to source files, use the Eclipse Java Compiler to compile the files and then hot swap the appropriate classes in the JVM. If you are looking for something similar, checkout ZeroTurnaround's <a href="http://www.zeroturnaround.com/jrebel/" rel="nofollow">JRebel</a>
it is not free, but well worth the time savings when you need to redeploy a large project.

blocks|key|976830|text|JDT+--+Play！使用Eclipse+JDT动态编译和装入类。与在Eclipse中编写代码的方式非常相似，只要键入不需要的内容，就会立即看到错误或警告消息。请参见ApplicationCompiler类。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|976831|您可能还想研究一下JDT。|976832|entityMap|0|LINK|mutability|MUTABLE|url|http://www.playframework.org/documentation/api/1.1.1/play/classloading/ApplicationCompiler.html|1|http://www.eclipse.org/jdt/overview.php^0|2C|J|0|0|9|3|1|0^^$0|@$1|2|3|4|5|6|7|P|8|@]|9|@$A|Q|B|R|1|S]]|C|$]]|$1|D|3|E|5|6|7|T|8|@]|9|@$A|U|B|V|1|W]]|C|$]]|$1|F|3|-4|5|6|7|X|8|@]|9|@]|C|$]]]|G|$H|$5|I|J|K|C|$L|M]]|N|$5|I|J|K|C|$L|O]]]]

JDT -- Play! uses Eclipse JDT to compile and load classes dynamically. Much the same way you code in Eclipse and you see an error or warning messages as soon as you type in something not desirable. See <a href="http://www.playframework.org/documentation/api/1.1.1/play/classloading/ApplicationCompiler.html" rel="nofollow">ApplicationCompiler</a> class.

You may also want to look into <a href="http://www.eclipse.org/jdt/overview.php" rel="nofollow">JDT</a>.

blocks|key|761338|text|Play使用Eclipse编译器在运行时编译代码。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|761339|看一下下面的类，Play使用它在运行时执行必要的编译。|761340|https://github.com/playframework/play/blob/master/framework/src/play/classloading/ApplicationCompiler.java|offset|length|761341|entityMap|0|LINK|mutability|MUTABLE|url^0|0|0|0|2Y|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|P|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|Q|8|@]|9|@$F|R|G|S|1|T]]|A|$]]|$1|H|3|-4|5|6|7|U|8|@]|9|@]|A|$]]]|I|$J|$5|K|L|M|A|$N|E]]]]

Play uses the Eclipse compiler to compile code at run-time.

Take a look at the following class, that is used by Play to perform the necessary compilation at run time.

<a href="https://github.com/playframework/play/blob/master/framework/src/play/classloading/ApplicationCompiler.java" rel="nofollow">https://github.com/playframework/play/blob/master/framework/src/play/classloading/ApplicationCompiler.java</a>

After looking at the Play! framework I find it really productive that the development server that it comes with automatically is able to compile .java files and show the changes, immediately. There's no hot deployer scanner that runs every tot seconds or so. The compilation happens when you hit refresh and it's extremely faster than my incremental <code>mvn package</code>. How do they do this?

I would like to know, well because I'm interested in knowing, but also because I don't want to use the entire Play! framework for my small project. I'm only interested in their development compilation process because I would like to adopt it :).

Any ideas?

Play! Java web framework. How does their development server compile automatically?

服务器

编译器

Eclipse

Java

看了这出戏之后！框架我发现它自动附带的开发服务器能够编译.java文件并立即显示更改，这真的很有效率。没有热部署扫描程序会每隔几秒左右运行一次。当你点击刷新时，编译就会发生，而且它比我的增量mvn package要快得多。他们如何做到这一点？我想知道，因为我对知道很感兴趣，但也因为我不想使用整个剧本！我的小项目的框架。...

问玩!Java web框架。他们的开发服务器是如何自动编译的？
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