java禁止反射

转载：https://blog.youkuaiyun.com/weixin_33774883/article/details/93570419

 

SecurityManager

有一个checkMemberAccess这个方法可以阻止利用反射；
如：

SecurityManager sm = new SecurityManager();
sm.checkMemberAccess(Test.class, Member.PUBLIC);

前面一个为CLASS，后面需要填一个INT值，Member.PUBLIC 代表可以访问，
如果是PUBLIC，反射可以执行，DECLARED，反射运行时，会报错。

 

SecurityManager另外一个例子：

package com.jd.basic.pk.manager;

import java.lang.reflect.Field;
import java.security.Permission;

public class UseReflection {
    static {
        try {
            System.setSecurityManager(new MySecurityManager());
        } catch (SecurityException se) {
            System.out.println("SecurityManager already set!");
        }

    }

    public static void main(String args[]) {
        Object prey = new Prey();
        try {
            Field pf = prey.getClass().getDeclaredField("privateString");
            pf.setAccessible(true);
            pf.set(prey, "Aminur test");
            System.out.println(pf.get(prey));
        } catch (Exception e) {
            System.err.println("Caught exception " + e.toString());
        }

    }
}

class Prey {
    @SuppressWarnings("unused")
    private String privateString = "privateValue";
}

class MySecurityManager extends SecurityManager {
    public void checkPermission(Permission perm) {
        if (perm.getName().equals("suppressAccessChecks")) {
            throw new SecurityException("Can not change the permission dude.!");
        }
    }
}