Java 关机处理

shutdown.java

// 推荐做法：
static class Stop extends Thread {
    static void init() {
        Runtime.getRuntime().addShutdownHook(new Stop());
    }

    @Override
    public void run() {
        Thread.currentThread().setName("stop");

        App.stop();

        Thread.getAllStackTraces().forEach((k, v) -> {logger.debug("剩余线程: {}, {}", k, v);});
    }
}


// 加上信号处理的版本(不建议使用信号处理，Signal是Sun的内部API而且会让程序对系统类型有依赖)：
static class Stop extends Thread implements SignalHandler {
    static void init() {
        Stop appStop = new Stop();

        Signal.handle(new Signal("INT"), appStop);
        Signal.handle(new Signal("TERM"), appStop);
    }

    @Override
    public void handle(Signal signal) {
        logger.debug("收到信号: {}", signal.toString());

        Runtime.getRuntime().addShutdownHook(this);

        System.exit(0);
    }

    @Override
    public void run() {
        Thread.currentThread().setName("stop");

        App.stop();

        Thread.getAllStackTraces().forEach((k, v) -> {logger.debug("剩余线程: {}, {}", k, v);});
    }
}