Java Timer.schedule只運行一次

我有一個應該基於Timer.schedule運行的TiimerTask。問題是它唯一的應用程序啓動時運行一次...... 也許這件事情懸而未決，但我不明白什麼...Java Timer.schedule只運行一次

這是我的類擴展TimerTask的

public class ClientScheduler extends TimerTask { 

    public String serverUrl = Start.getHost(); 
    public String append = "/client/checkVersion"; 
    public String numeroClient = null; 
    public String actualVersion = null; 
    public String filePrefix = "eparkclient-"; 
    public String fileSuffix = "-jar-with-dependencies.jar"; 
    private final Logger logger = Logger.getLogger(ClientScheduler.class); 

    public ClientScheduler() { 

    } 

    @Override 
    public void run() { 



       logger.debug("Scheduler starts"); 
       String finalUrl = null; 
       try { 
        numeroClient = PropertyConfig.getClientId(); 

        actualVersion = PropertyConfig.getFirmwareVersion(); 
        finalUrl = serverUrl + append + "?numeroClient=" + numeroClient; 

        HttpConnection http = new HttpConnection(); 
        String result = http.getHTTPResponse(finalUrl); 
        JSONObject json = new JSONObject(result); 
        String firmwareVersion = json.getString("firmwareVersion"); 
        Boolean updated = json.getBoolean("firmwareUpdated"); 

        if(!actualVersion.equalsIgnoreCase(firmwareVersion)){ 
         //scarico il file dall'ftp 
         FTPDownload ftp = new FTPDownload(); 
         String filename = filePrefix+firmwareVersion+fileSuffix; 
         logger.debug("filename è "+filename); 
         boolean success = ftp.getFile(filename); 
         if(success) { 
          //scrivo la versione nuova sul file 
          PropertyConfig.setFirmwareVersion(firmwareVersion); 
          //comunico al server l'aggiornamento riuscito 
          HttpConnection answer = new HttpConnection(); 
          String url = serverUrl + "/client/pushUpdate?numeroClient=" + numeroClient + "&firmwareVersion=" + 
          firmwareVersion + "&updated=0"; 

          String r = answer.getHTTPResponse(url); 
          System.exit(0); 

         } 


        } else if(actualVersion.equalsIgnoreCase(firmwareVersion) && !updated){ //ho riavviato, devo aggiornare il DB 

         HttpConnection answer = new HttpConnection(); 
         String url = serverUrl + "/client/pushUpdate?numeroClient=" + numeroClient + "&firmwareVersion=" + 
         firmwareVersion + "&updated="+!updated; 

         String r = answer.getHTTPResponse(url); 

        } else { 
         logger.debug("Non dobbiamo fare niente"); 
        } 
       } catch (IOException e) { 
        logger.error("Errore Property", e); 

       } 
      } 

    }

任務被稱爲當應用程序以這種方式啓動時

public static void main(String[] args) throws Exception { 
     logger.info("L'ip del client è " + getCurrentIP()); 

     //faccio partire lo scheduler 
     logger.debug("Scheduler called"); 

     Timer timer = new Timer(); 
     timer.schedule(new ClientScheduler(), 10*1000);

來源

2016-09-20 besmart

你閱讀[文件]（http://docs.oracle.com/javase/8/docs/api/java/util/Timer.html#schedule- java.util.TimerTask中，長期）？你需要調用一個三參數'schedule'方法來重複執行。 – VGR

您只安排一次計時器任務。

調度方法被定義爲

時間表（TimerTask的任務，長延遲）

時刻表指定的延遲後執行指定的任務。

但是，你需要使用此方法：

時間表（TimerTask的任務，長時間的延遲，週期長）

時刻表指定的任務重複的固定延遲執行，開始在指定的延遲之後。

請參閱Javadocs這裏：https://docs.oracle.com/javase/8/docs/api/java/util/Timer.html#schedule-java.util.TimerTask-long-long-

來源

2016-09-20 21:28:45 thst

Java Timer.schedule只運行一次

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