/**
     * 获取RMI接口状态
     *
     * @return "0":服务正常,"1":  连接报错,"2":连接超时
     */
    @Override
    public String getRMIJkzt() {
        final ExecutorService es = Executors.newFixedThreadPool(1);
        Callable<String> callable = new Callable<String>() {//使用Callable接口作为构造参数
            @Override
            public String call() throws Exception {//真正的任务在这里执行，这里的返回值类型为String，可以为任意类型
                URL url = new URL("rmi://192.168.20.188:1098/ht");
                InputStream in = url.openStream();
                in.close();
                return "0";
            }
        };
        try {
            Future future = es.submit(callable);
            String value = http://www.mamicode.com/null;>