blocks|key|1609669|text|Eclipse编译器只有1.6MB，无需Eclipse就可以工作。你可以下载它这里。此外，它似乎实现了JavaCompiler+API。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|1609670|它是在Eclipse公共许可证下获得许可的，因此将它包含在您自己的应用程序中应该没有问题。|1609671|entityMap|0|LINK|mutability|MUTABLE|url|http://www.eclipse.org/downloads/download.php?file=/eclipse/downloads/drops/R-3.6-201006080911/ecj-3.6.jar^0|13|2|0|0|0^^$0|@$1|2|3|4|5|6|7|N|8|@]|9|@$A|O|B|P|1|Q]]|C|$]]|$1|D|3|E|5|6|7|R|8|@]|9|@]|C|$]]|$1|F|3|-4|5|6|7|S|8|@]|9|@]|C|$]]]|G|$H|$5|I|J|K|C|$L|M]]]]

The Eclipse compiler is only 1.6 MB and should work without Eclipse. You can download it <a href="http://www.eclipse.org/downloads/download.php?file=/eclipse/downloads/drops/R-3.6-201006080911/ecj-3.6.jar" rel="nofollow noreferrer">here</a>. Also it looks like it implements the JavaCompiler API.
It is licensed under the Eclipse public license so including it in your own application should be no problem.

blocks|key|412406|text|我认为分裂tools.jar是不可能的，也不应该包括tools.jar。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|412407|检查http://forums.sun.com/thread.jspa?threadID=5161541|offset|length|412408|您可以查找一些第三方Java编译器，并将您的代码更改为使用它。|412409|GCJ是gcc的一部分，它编译了C、Fortran、Pascal和Java以外的其他编程语言。它还可以使用gcc的后端生成本机代码。Java|unordered-list-item|412410|ECJ，，是Eclipse使用的开源增量编译器。|412411|http://en.wikipedia.org/wiki/Jikes+(这个版本不支持Java6，对Java5的支持也有限)|412412|但我不知道用这些来编译的确切代码。|412413|entityMap|0|LINK|mutability|MUTABLE|url|http://forums.sun.com/thread.jspa?threadID=5161541|1|http://en.wikipedia.org/wiki/GNU_Compiler_for_Java|2|http://en.wikipedia.org/wiki/Jikes^0|0|2|1E|0|0|0|1U|4|1|0|0|0|Y|2|0|0^^$0|@$1|2|3|4|5|6|7|12|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|13|8|@]|9|@$D|14|E|15|1|16]]|A|$]]|$1|F|3|G|5|6|7|17|8|@]|9|@]|A|$]]|$1|H|3|I|5|J|7|18|8|@]|9|@$D|19|E|1A|1|1B]]|A|$]]|$1|K|3|L|5|J|7|1C|8|@]|9|@]|A|$]]|$1|M|3|N|5|J|7|1D|8|@]|9|@$D|1E|E|1F|1|1G]]|A|$]]|$1|O|3|P|5|6|7|1H|8|@]|9|@]|A|$]]|$1|Q|3|-4|5|6|7|1I|8|@]|9|@]|A|$]]]|R|$S|$5|T|U|V|A|$W|X]]|Y|$5|T|U|V|A|$W|Z]]|10|$5|T|U|V|A|$W|11]]]]

I don't think it would be possible to breakup tools.jar, And also it should not be legal to include tools.jar.

Check <a href="http://forums.sun.com/thread.jspa?threadID=5161541" rel="nofollow noreferrer">http://forums.sun.com/thread.jspa?threadID=5161541</a>

You could look for some 3rd party Java Compiler and change your code to use same.

<ul>
<li>GCJ, a part of gcc which compiles C,
Fortran, Pascal and other programming
languages besides Java. It can also
generate native code using the
back-end of gcc. 
<a href="http://en.wikipedia.org/wiki/GNU_Compiler_for_Java" rel="nofollow noreferrer">http://en.wikipedia.org/wiki/GNU_Compiler_for_Java</a></li>
<li>ECJ, the Eclipse Compiler for Java,
is an open source incremental
compiler used by the Eclipse JDT.</li>
<li><a href="http://en.wikipedia.org/wiki/Jikes" rel="nofollow noreferrer">http://en.wikipedia.org/wiki/Jikes</a>
(This one doesn't support Java 6 and
limited support for Java5)</li>
</ul>

But I don't know exact code for compiling using these.

blocks|key|412516|text|我不会在运行时编译代码，而是用脚本语言重写代码并使用脚本框架。因此，jdk没有必要，也没有任何法律问题需要解决。然后，您还可以使用多种语言，如贝贝、JavaScript或jython。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|412517|entityMap|0|LINK|mutability|MUTABLE|url|https://scripting.dev.java.net/|1|http://www.beanshell.org/|2|http://www.mozilla.org/rhino/|3|http://www.jython.org/^0|Q|4|0|1Z|2|1|22|A|2|2D|6|3|0^^$0|@$1|2|3|4|5|6|7|R|8|@]|9|@$A|S|B|T|1|U]|$A|V|B|W|1|X]|$A|Y|B|Z|1|10]|$A|11|B|12|1|13]]|C|$]]|$1|D|3|-4|5|6|7|14|8|@]|9|@]|C|$]]]|E|$F|$5|G|H|I|C|$J|K]]|L|$5|G|H|I|C|$J|M]]|N|$5|G|H|I|C|$J|O]]|P|$5|G|H|I|C|$J|Q]]]]

Instead of compiling code at runtime, I would rewrite the code in a scripting language and use the <a href="https://scripting.dev.java.net/" rel="nofollow noreferrer">scripting framework</a>. There's no need then for the jdk and there are no legal issues to get around. Then you also have many choices of languages to use such as <a href="http://www.beanshell.org/" rel="nofollow noreferrer">Beanshell</a>, <a href="http://www.mozilla.org/rhino/" rel="nofollow noreferrer">JavaScript</a>, or <a href="http://www.jython.org/" rel="nofollow noreferrer">jython</a>.

blocks|key|1609787|text|也许更好的问题是为什么？|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1609788|如果您需要进行动态数学计算，那么请考虑JEval。如果您需要人们编写简单的插件，请考虑@Jay提到的一些动态语言，如Javascript或Python。|1609789|对于其他方面，您应该要求用户下载JDK，因为编写Java需要这样做。很难找到一个很好的理由来将编译器嵌入到程序中。|1609790|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|H|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|I|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|J|8|@]|9|@]|A|$]]|$1|F|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|G|$]]

Probably a better question is why?

If you need to do dynamic math calculations, then consider JEval. If you need people to write simple plugins, consider some of the dynamic languages like Javascript or Python that @Jay mentioned. 

For anything else, you should require that your user download the JDK, since thats what writing Java requires. It would be hard to find a good reason why you would want to embed a compiler into your program

blocks|key|1609675|text|你想要像BeanShell这样的java脚本吗？它帮助运行java代码而不编译它们。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1609676|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

do you want something like java-scripting like BeanShell?
It help run java code without compile them.

blocks|key|412548|text|您可能想看一下Javassist库，它包含一个片段编译器，适合创建一个方法来进行计算，然后使用该方法。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|412549|哪一个最合适取决于你的实际需求，尤其是你需要多久做一次。|412550|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|F|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|G|8|@]|9|@]|A|$]]|$1|D|3|-4|5|6|7|H|8|@]|9|@]|A|$]]]|E|$]]

You may want to have a look at the Javassist library which contains a snippet compiler suitable for creating a method to do a calculation and then using that method.

Which one is most suitable depends on your actual needs - especially how frequently you need to do this.

In my current project, I need to compile java code at runtime (in the background to process input from the user). This works fine with tools.jar in the classpath. However, not all users of my program have JDK installed on their system. Some of them only have JRE and in that case there is no java compiler available at runtime. I can solve that problem by including tools.jar from Sun as a part of my tool. 

But tools.jar is very big (>12 MB). The problem is that I have to include the large jar file, although I am interested only in a small fraction of the functionality provided by this jar.

<ol>
<li>Is it possible to break up the
tools.jar file so that I have a
small subset of classes that are
required for compiling java code
only? </li>
<li>Is this illegal?</li>
</ol>

Thanks a lot.

Java compiler at Runtime

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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在我的当前项目中，我需要在运行时编译java代码(在后台处理来自用户的输入)。在类路径中，tools.jar可以很好地工作。然而，并非我的程序的所有用户都在他们的系统上安装了JDK。其中一些只有JRE，在这种情况下，运行时没有java编译器。我可以通过将Sun的tools.jar作为我工具的一部分来解决这个问题。但是tools.jar非常大(>12 MB)。问题是我必须包含大jar文件，尽管我只对

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