package com.yupi.yuojcodesandbox.security; import cn.hutool.core.io.FileUtil; import java.nio.charset.Charset; /** * 测试安全管理器 */ public class TestSecurityManager { public static void main(String[] args) { System.setSecurityManager(new MySecurityManager()); FileUtil.writeString("aa", "aaa", Charset.defaultCharset()); } }