Javassist捕获特定语句的局部变量值

import javassist.*;

public class JavassistExample {
    public static void main(String[] args) {
        try {
            // 创建ClassPool对象
            ClassPool classPool = ClassPool.getDefault();

            // 加载要修改的类
            CtClass ctClass = classPool.get("com.example.MyClass");

            // 获取要修改的方法
            CtMethod ctMethod = ctClass.getDeclaredMethod("myMethod");

            // 获取方法中的指令
            MethodInfo methodInfo = ctMethod.getMethodInfo();
            CodeAttribute codeAttribute = methodInfo.getCodeAttribute();
            CodeIterator codeIterator = codeAttribute.iterator();

            // 遍历指令
            while (codeIterator.hasNext()) {
                int index = codeIterator.next();

                // 判断是否是我们要捕获的特定语句
                if (codeIterator.byteAt(index) == Opcode.INVOKEVIRTUAL) {
                    // 获取局部变量表
                    LocalVariableAttribute localVariableAttribute = (LocalVariableAttribute) codeAttribute.getAttribute(LocalVariableAttribute.tag);
                    int localVarIndex = codeIterator.byteAt(index + 1);

                    // 获取局部变量的名称和值
                    String localVarName = localVariableAttribute.variableName(localVarIndex);
                    Object localVarValue = codeIterator.getMethodInfo().getConstPool().getIntegerInfo(codeIterator.byteAt(index + 2));

                    System.out.println("局部变量名：" + localVarName);
                    System.out.println("局部变量值：" + localVarValue);
                }
            }

            // 保存修改后的类
            ctClass.writeFile();
        } catch (NotFoundException | CannotCompileException | IOException e) {
            e.printStackTrace();
        }
    }
}