2016-11-10 49 views
0

我的主要程序如下:的TimerTask並不適用於參數

package priceCollector; 

import java.io.BufferedInputStream; 
import java.io.ByteArrayOutputStream; 
import java.io.FileOutputStream; 
import java.io.InputStream; 
import java.net.URL; 
import java.text.DateFormat; 
import java.util.Date; 

public class App extends TimerTask { 

    public static void main(String[] args) { 

     Date now = new Date(); 
     DateFormat df = DateFormat.getDateInstance(); 
     String s = df.format(now); 

     String fileName = "/Users/Desktop/" + s + ".csv"; 

     URL link = null; 
     try { 
      link = new URL("http://finance.yahoo.com/d/quotes.csv?s=III.L+ADM.L+AAL.L+ANTO.L+AHT.L+ABF.L+AZN.L+AV.L+BAB.L+BA.L+BARC.L+BDEV.L+BLT.L+BP.L+BATS.L+BLND.L+BTA.L+BNZL.L+BRBY.L+CPI.L+CCL.L+CNA.L+CCH.L+CPG.L+CRH.L+CRDA.L+DCC.L+DGE.L+DLG.L+DC.L+EZJ.L+EXPN.L+FRES.L+GKN.L+GSK.L+GLEN.L+HMSO.L+HL.L+HIK.L+HSBA.L+IMB.L+INF.L+IHG.L+IAG.L+ITRK.L+INTU.L+ITV.L+JMAT.L+KGF.L+LAND.L+LGEN.L+LLOY.L+LSE.L+MKS.L+MDC.L+MERL.L+MCRO.L+MNDI.L+MRW.L+NG.L+NXT.L+OML.L+PPB.L+PSON.L+PSN.L+POLY.L+PFG.L+PRU.L+RRS.L+RB.L+REL.L+RIO.L+RR.L+RBS.L+RDSA.L+RDSB.L+RMG.L+RSA.L+SGE.L+SBRY.L+SDR.L+SVT.L+SHP.L+SKY.L+SN.L+SMIN.L+SSE.L+STJ.L+STAN.L+SL.L+TW.L+TSCO.L+TPK.L+TUI.L+ULVR.L+UU.L+VOD.L+WTB.L+WOS.L+WPG.L+WPP.L&f=np"); 

      InputStream in = new BufferedInputStream(link.openStream()); 
      ByteArrayOutputStream out = new ByteArrayOutputStream(); 
      byte[] buf = new byte[1024]; 
      int n = 0; 
      while (-1!=(n=in.read(buf))){ 
       out.write(buf, 0, n); 
      } 
      out.close(); 
      in.close(); 
      byte[] response = out.toByteArray(); 

      FileOutputStream fos = new FileOutputStream(fileName); 
      fos.write(response); 
      fos.close(); 
     } catch (Exception e) { 
      System.out.println("not available"); 
     } 
    } 
} 

當單獨運行這工作得很好,但是我想設置定期這將使它每天RUND。我TimerTask的程序是:

package priceCollector; 

import java.util.Calendar; 
import java.util.Timer; 
import java.util.concurrent.TimeUnit; 

public class TimerTask { 

    public void runTask(){ 

     Calendar calendar = Calendar.getInstance(); 
     calendar.set(Calendar.HOUR_OF_DAY, 21); 
     calendar.set(Calendar.MINUTE, 15); 
     calendar.set(Calendar.SECOND, 0); 
     calendar.set(Calendar.MILLISECOND, 0); 

     Timer time = new Timer(); // Instantiate Timer Object 

     // Start running the task on Thursday at 21:15:00, period is set to 1 day 
     // if you want to run the task immediately, set the 2nd parameter to 0 
     time.schedule(new App(), calendar.getTime(), TimeUnit.HOURS.toMillis(8)); 
    } 
} 

最後一行(日程參數)提供以下錯誤:

The method schedule(TimerTask, Date, long) in the type Timer is not applicable for the arguments (App, Date, long)

不知道這是什麼。 Java新手!謝謝。

+0

你的問題是,你嘗試調用方法'調度(...)'與'App'類型的對象而不是'TimerTask'。該錯誤消息基本上說,您作爲參數傳遞的類型不匹配。嘗試使用'new TimerTask(...)'(因爲我不知道這個類,所以不能幫助你,因爲...) –

回答

0

第二個參數是初始延遲,如下API所示:

//Example, If you want to configure the initial delay as 5 seconds 
time.schedule(new App(), 5000, TimeUnit.HOURS.toMillis(8)); 

public void schedule(TimerTask task, long delay, long period)

任務 - 要調度的任務。

延遲 - 以毫秒爲單位執行任務之前的延遲。

週期 - 時間以毫秒爲單位,表示連續任務執行之間的時間。