java-compiler-api - 支持泛型的 Java 动态代码生成

Question

有没有提供Java动态代码生成并且还支持泛型的工具？

例如Javassist，就是我需要的那种工具，但是它不支持泛型。

我写了一个使用 Java 6 编译器 API 的小库，但据我所知它依赖于 JDK。有没有办法指定另一个编译器？或者仅随我的应用程序提供我需要使用 Java Compiler API 调用的部分？

Answer 1

您似乎可以使用 Javaassist 操作和读取通用信息。见

http://www.mail-archive.com/jboss-user@lists.jboss.org/msg101222.html

[jboss-user] [Javassist user questions] - Re: Altering Generics Information of Methods using Javassist SimonRinguette Thu, 20 Dec 2007 12:22:14 -0800

I have done further reading on how this is implemented by the compiler and finally found out the answer I was looking for.

You can defenitely do that with javaassist. The key class is javassist.bytecode.SignatureAttribute.

From a CtMethod, i've obtained the methodInfo I add a Signature attribute. You can do it with something like:

CtMethod method = ....
   MethodInfo methodInfo = method.getMethodInfo();
   SignatureAttribute signatureAttribute = new 
SignatureAttribute(methodInfo.getConstPool(),
   "()Ljava/util/List<Ljava/lang/String;>;");
   methodInfo.addAttribute(signatureAttribute);

If your more interesed in reading the signature with the generics inside, you can use the methodInfo.getAttribute(SignatureAttribute.tag).

I hope this helped.