0. 概述

本文使用Java异常中的堆栈信息来检测调用方的类是否为指定类，效果如下：

public class Main {
    public static void main(String[] args) {
        System.out.println(isCalledFrom(File.class)); // => print false
        System.out.println(isCalledFrom(Main.class));	// => print true
        test();	// => print true
    }

    static void test(){
        System.out.println(isCalledDirectlyFrom(Main.class));
    }
}

1. isCalledFrom

isCalledFrom判断是否直接或间接从某个类调用进来，定义如下：

public static boolean isCalledFrom(Class<?> mClass) {
    try {
        throw new RuntimeException();
    } catch (Exception e) {
        StackTraceElement[] stackTrace = e.getStackTrace();
        for (int i = 0; stackTrace != null && i < stackTrace.length; i++) {
            if (Objects.equals(mClass.getName(), stackTrace[i].getClassName())) {
                return true;
            }
        }
        return false;
    }
}

2. isCalledDirectlyFrom

isCalledDirectlyFrom判断是否直接从某个类调用进来，定义如下：

public static boolean isCalledDirectlyFrom(Class<?> mClass) {
    try {
        throw new RuntimeException();
    } catch (Exception e) {
        StackTraceElement[] stackTrace = e.getStackTrace();
        if (stackTrace != null && stackTrace.length > 2) {
            return Objects.equals(stackTrace[2].getClassName(), mClass.getName());
        } else {
            return false;
        }
    }
}