java安全退出程序------关闭钩子

Posted 2020-11-05

测试代码：

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public class TestHook {

public static boolean hookFlag = false;

public static void main(String[] args) {

    Thread shutDownThread = new Thread() {
        public void run() {
            TestHook.hookFlag = true;
            try {
                Thread.sleep(5000);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
            System.out.println("hook success!"+TestHook.hookFlag);
        }
    };
    Runtime.getRuntime().addShutdownHook(shutDownThread);
    System.out.println("hook init" + TestHook.hookFlag);
    while(!TestHook.hookFlag) {
        try {
            Thread.sleep(1000);
            System.out.println("没安全退出");
        } catch (InterruptedException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }
    System.out.println("安全退出");
}

}

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执行命令 kill [pid]

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运行结果：