Java 访问局部变量名
我目前正在编写一个程序，我想在程序执行期间访问局部变量的变量名并将它们传递到外部。我知道 Java 会在编译期间转储局部变量名称，除非在调试模式下编译。
环顾四周后，似乎 JDI/JPDA 是此类工作的最佳选择。假设 ref 引用 ThreadReference ，以下是我到目前为止所得到的：
ref.suspend();
StackFrame currentFrame = ref.frame(0);
List<LocalVariable> vars = currentFrame.visibleVariables();
ref.resume();
两个问题：
- 我走在正确的轨道上，还是有更好的方法来做到这一点？
- 如何获取
ThreadReference并将其设置为ref？ LocatableEvent 似乎是我所需要的，但是任何人都可以提供如何使用它的示例吗？
非常感谢！
I'm currently writing a program in which I would like to access the variable names of local variables during execution of a program and pass them off externally. I'm aware that Java will dump local variable names during compilation unless compiled in debug mode.
After looking around some, it seems that JDI/JPDA is the way to go for this kind of work. Assuming ref refers to a ThreadReference, the following is what I have thus far:
ref.suspend();
StackFrame currentFrame = ref.frame(0);
List<LocalVariable> vars = currentFrame.visibleVariables();
ref.resume();
Two questions:
- Am I on the right track, or is there a better way to do this?
- How do I acquire the
ThreadReferenceto set toref? LocatableEvent seems to be what I need, but can anyone provide an example on how to use it?
Many thanks in advance!
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没有多少人有这方面的经验。
到别处寻找答案。我有代码链接，但现在没有了。无法删除此答案，因为它已被接受。
Not a lot of people have experience with this stuff.
Look elsewhere for an answer. I had links to code but they are no longer. Cannot delete this answer because it was accepted answer.
是的，您走在正确的道路上！
对于任何想要尝试开始使用 JDI 的人来说，“Trace”示例非常宝贵：
http://www.docjar.com/docs/api/com/sun/tools/example/trace/package-index.html
这是一个可用的主干。它向您展示了如何使用事件，这确实会给您一个 ThreadReference。它还向您展示了如何以编程方式启动第二个 JVM。
Yes, you are on the right track!
For anyone who wants to try to get started with the JDI, the "Trace" example is invaluable:
http://www.docjar.com/docs/api/com/sun/tools/example/trace/package-index.html
It's a usable backbone. It shows you how to use events, which indeed will give you a ThreadReference. It also shows you how to start up the second JVM programmatically.