Java定时任务ScheduledThreadPoolExecutor(一)

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 devices = new ArrayList();

// 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);