Java定时任务ScheduledThreadPoolExecutor

以前定时任务一直用Timer这个类，后来发现ScheduledThreadPoolExecutor功能更强大，我们先看个简单的示例，然后再看看API中的描述：

这个定时任务是我的项目中，每隔5分钟去检查设备的在线状态的。
[java]
public class CheckDeviceStateExcuter {

    private static final Log log = LogFactory.getLog(CheckDeviceStateExcuter.class);

    private static final ScheduledExecutorService scheduler = Executors.newScheduledThreadPool(1);

    private static DeviceDao deviceDao = new DeviceDaoImpl();
    private static List<DeviceDTO> devices = new ArrayList<DeviceDTO>();

    // invoke DLL method to get the details of device
    static JoymindCommDLLLib instance = JoymindCommDLLLib.INSTANCE;
    // check states
    public static void checkStart() {
        final Runnable checker = new Runnable() {
            public void run() {
                System.out.println("check");
                devices = deviceDao.queryDevices();
                for(DeviceDTO device : devices){
                    String ip = device.getIp();
                    String id = "auto_refresh_" + ip;
                    String iniPath = XmlOperationTool.PLAYLIST_TEMPFILE_FOLDER + id
                            + ".ini";
                    int flag = instance.GetSysInfo(ip, iniPath);

                    if(flag == 1){
                        // get ini file
                        SystemInfoDTO info = null;
                        try {
                            info = FileOperationTool.parseIni(iniPath);

                            device.setMacAdd(info.getMacAddress());
                            device.setIp(info.getIp());
                            device.setGateway(info.getGateway());
                            device.setOnlineState("在线");
                            device.setBootTime(info.getBootTime());
                            device.setDeviceVersion(info.getVersion());
                            device.setAvailableSpace(info.getFreedisk());

                            device.setpNo(info.getpNo());
                            device.setWidth(info.getWidth());
                            device.setHeight(info.getHeight());
                            device.setStorage(info.getStorage());
                            device.setTime(info.getTime());
                            device.setPrgTotal(info.getPrgTotal());
                            device.setPrgIndex(info.getPrgIndex());
                            device.setStatusNo(info.getStatus());

                            if (info.getStorage().equals("1")) {
                                device.setStorageName("FLASH存储");
                            }
                            if (info.getStorage().equals("2")) {
                                device.setStorageName("RAM存储");
          &n

补充：软件开发 , Java ,