Java-如何限制从特定方法进行的方法调用 [英] Java - How to restrict method calling from a specific method

问题描述

我有一个特殊的要求，即我需要确保只允许一个类中的特定方法调用第二个类中的公共(非静态)方法.不能使用继承.

I have a peculiar requirement where I need ensure that only a particular method from one class is allowed to call a public (non-static) method from a second class. Inheritance cannot be used.

一种选择是如下使用StackTrace:

One option is to use StackTrace as follows:

ClassA.java

package org.rnd.stack;


public class ClassA {
    public void methodA() throws IllegalAccessException {
        Exception fake = new Exception("FAKE-IGNORE");
        StackTraceElement[] stack = fake.getStackTrace();
        StackTraceElement st = stack[1];
        if ("org.rnd.stack.ClassB".equals(st.getClassName())
                && "methodB".equals(st.getMethodName())) {
            System.out.println("You are allowed to call");
        } else {
            throw new IllegalAccessException("You are not allowed to call");
        }
    }
}

ClassB.java

package org.rnd.stack;

public class ClassB {
    public void methodB() throws IllegalAccessException {
        new ClassA().methodA();
    }

    public void illegalMethod() throws IllegalAccessException {
        new ClassA().methodA();
    }

    public static void main(String[] args) {
        try {
            new ClassB().methodB();
        } catch (IllegalAccessException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }
}

现在，上述解决方案可以正常工作，但是由于代码审核中的质量控制，我需要提出另一个(或更确切地说)更好的解决方案.有没有更好的方法来实现这一目标?

Now the above solution works fine, but due to quality control in code audit I need to come up with another (or rather) better solution. Is there a better way to achieve this?

推荐答案

一种改进方法的方法是，您无需创建异常即可获取堆栈跟踪，可以使用线程方法.

A way to improve you method is that you don't need to create an exception to get the stacktrace, you can use the thread methods.

StackTraceElement[] stack = Thread.currentThread().getStackTrace();

也许您也想使用类而不是手写包.例如:

Also maybe you want to use the class instead of handwriting the package. For example:

if (ClassB.class.getName().equals(st.getClassName())
                && "methodB".equals(st.getMethodName())) {
    System.out.println("You are allowed to call");
} else {
    throw new IllegalAccessException("You are not allowed to call");
}

除此之外，我不知道如何在不更改逻辑或使用继承的情况下更好地做到这一点.

Apart from that I don't know how you can do it better without changing your logic or using inheritance.

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