在运行时编译动态生成的类，而无需写入文件 [英] Compile dynamically generated class at runtime w/o writing to File

问题描述

我正在使用JCodeModel生成Java源代码，现在想在运行时进行编译。但是我不想以前将Java文件写入光盘。

I'm generating java sources with JCodeModel and now want to compile at runtime. But I don't want to write the Java files to disc before.

据我所知，可以使用javax.tools.JavaCompiler（< a href = http://www.accordess.com/wpblog/an-overview-of-java-compilation-api-jsr-199/ rel = nofollow>请参见示例），但看起来

As far as I can see, the dynamic compiling is possible with javax.tools.JavaCompiler (see example) , but it looks like I need the source code for this.

不幸的是，我找不到直接从JDefinedClass获取源代码的方法。似乎我需要将JDefinedClass写入磁盘上的File对象，然后再读取源代码。

Unfortunately I can't find a way to directly get the source code from a JDefinedClass. It seems as if I need to write a JDefinedClass to a File object on disc and read the source afterwards.

这真的有必要还是有解决方法？

Is this really necessary or is there some workaround?

推荐答案

您可以使用以下代码来避免磁盘操作，并使用 SingleStreamCodeWriter 直接在内存中编写代码：

You can use following code to avoid disk operations and write your code directly in memory using SingleStreamCodeWriter:

JCodeModel jCodeModel = createJCodeModel(); // create and prepare JCodeModel 
ByteArrayOutputStream baos = new ByteArrayOutputStream();
CodeWriter codeWriter = new SingleStreamCodeWriter(baos);
jCodeModel.build(codeWriter);

String code = baos.toString(); // you can use toString(charset) if there are special characters in your code

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