我想获取调用方法java.lang.reflect.Method
。 不是方法的名称。
这是一个如何获取调用者类的示例。
// find the callers class
Thread t = Thread.getCurrentThread();
Class<?> klass = Class.forName(t.getStackTrace()[2].getClassName());
// do something with the class (like processing its annotations)
...
仅供测试!
最佳答案
如果它只是为了测试,那么这可能会起作用。它假定类文件可通过调用类的 ClassLoader
访问,并且类文件是使用调试符号编译的(我希望它们用于测试!)。此代码依赖于 ASM bytecode library .
public static Method getMethod(final StackTraceElement stackTraceElement) throws Exception {
final String stackTraceClassName = stackTraceElement.getClassName();
final String stackTraceMethodName = stackTraceElement.getMethodName();
final int stackTraceLineNumber = stackTraceElement.getLineNumber();
Class<?> stackTraceClass = Class.forName(stackTraceClassName);
// I am only using AtomicReference as a container to dump a String into, feel free to ignore it for now
final AtomicReference<String> methodDescriptorReference = new AtomicReference<String>();
String classFileResourceName = "/" + stackTraceClassName.replaceAll("\\.", "/") + ".class";
InputStream classFileStream = stackTraceClass.getResourceAsStream(classFileResourceName);
if (classFileStream == null) {
throw new RuntimeException("Could not acquire the class file containing for the calling class");
}
try {
ClassReader classReader = new ClassReader(classFileStream);
classReader.accept(
new EmptyVisitor() {
@Override
public MethodVisitor visitMethod(int access, final String name, final String desc, String signature, String[] exceptions) {
if (!name.equals(stackTraceMethodName)) {
return null;
}
return new EmptyVisitor() {
@Override
public void visitLineNumber(int line, Label start) {
if (line == stackTraceLineNumber) {
methodDescriptorReference.set(desc);
}
}
};
}
},
0
);
} finally {
classFileStream.close();
}
String methodDescriptor = methodDescriptorReference.get();
if (methodDescriptor == null) {
throw new RuntimeException("Could not find line " + stackTraceLineNumber);
}
for (Method method : stackTraceClass.getMethods()) {
if (stackTraceMethodName.equals(method.getName()) && methodDescriptor.equals(Type.getMethodDescriptor(method))) {
return method;
}
}
throw new RuntimeException("Could not find the calling method");
}
关于java - 获取调用者方法 (java.lang.reflect.Method),我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/4024587/