在Java中挂钩现有方法 [英] Hooking an existing method in Java

问题描述

我希望在Java中挂钩方法System.out.print，并且能够在调用方法的部分之前读取/更改方法中使用的变量，该方法实际上将字符串添加到输出流的任何位置。

I want to hook the method System.out.print in Java and have the ability to read/change the variables used in the method before the part of the method is called that actually adds the string to whatever the output stream is.

在C ++中我只是绕道该函数，或者设置一个int3指令，这样我就可以访问寄存器但是在java中我不知道如何完成类似的东西。

In C++ I would just detour the function, or set an int3 instruction so I could access the registers but in java I have no idea how to accomplish something similar.

推荐答案

您可以重写方法的字节代码，并在此过程中捕获/更改局部变量。这不是微不足道的。请参阅此处。

You can rewrite the byte code of the methods, and in the process capture/change the local variables. It is not trivial. See some notes here.

也许您真正想要的是java调试器？您可以使用eclipse将调试器连接到远程进程，添加断点以及非常轻松地捕获/更改局部变量。

Maybe what you really want is a java debugger? You can connect a debugger to a remote process, add a breakpoint, and capture/change the local variables pretty easily using eclipse.

您尝试的实际问题是什么？解决？

What is the real problem you are trying to solve?

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