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我想使用Timer和TimerTask類的簡單調度器看到下面的代碼,我只是想打印「Hello,World!」的任務內部。在頁面上,但它拋出IOException:流關閉。請幫忙!Java。嘗試使用簡單調度程序(Timer,TimerTask)在JSP頁面上打印後獲取IOException。需要幫助
JSP頁面代碼:
<% Test t = new Test(out);%>
測試類代碼:
public class Test {
public Test(JspWriter out){
Timer timer = new Timer();
LpdbTask lTask = new LpdbTask();
lTask.out = out;
timer.scheduleAtFixedRate(lTask, 1000*5, 1000*60);
}
}
LpdbTask代碼:
public class LpdbTask extends TimerTask{
public JspWriter out;
public void run(){
try {
out.println("Hello, World!");
} catch (IOException e) {
e.printStackTrace();
}
}
}
錯誤:
java.io.IOException: Stream closed
at org.apache.jasper.runtime.JspWriterImpl.ensureOpen(JspWriterImpl.java:204)
at org.apache.jasper.runtime.JspWriterImpl.write(JspWriterImpl.java:312)
at org.apache.jasper.runtime.JspWriterImpl.write(JspWriterImpl.java:342)
at org.apache.jasper.runtime.JspWriterImpl.print(JspWriterImpl.java:468)
at org.apache.jasper.runtime.JspWriterImpl.println(JspWriterImpl.java:576)
at scheduler.LpdbTask.run(LpdbTask.java:14)
at java.util.TimerThread.mainLoop(Unknown Source)
at java.util.TimerThread.run(Unknown Source)
厄內斯特,謝謝你的快速反應! –