我正在使用Swingworker從url地址請求值以動態更改所顯示信息的版本。在某些情況下,這名工人被取消。問題是我有時會得到java.lang.InterruptedException(但不是每次我取消worker時)。我不知道該如何處理它,而且我也不知道它在哪裏拋出,我無法調試它,因爲我在短時間內進行大量版本更改時得到它(我使用滑塊,並且在拖動它時發生這種情況一段時間)。一切工作正常,但我得到這個惱人的錯誤:java.lang.InterruptedException使用swingworker
java.lang.InterruptedException
at java.lang.Object.wait(Native Method)
at sun.plugin2.message.Queue.waitForMessage(Unknown Source)
at sun.plugin2.message.Pipe$2.run(Unknown Source)
at com.sun.deploy.util.Waiter$1.wait(Unknown Source)
at com.sun.deploy.util.Waiter.runAndWait(Unknown Source)
at sun.plugin2.message.Pipe.receive(Unknown Source)
at sun.plugin2.main.client.MessagePassingExecutionContext.doCookieOp(Unknown Source)
at sun.plugin2.main.client.MessagePassingExecutionContext.getCookie(Unknown Source)
at sun.plugin2.main.client.PluginCookieSelector.getCookieFromBrowser(Unknown Source)
at com.sun.deploy.net.cookie.DeployCookieSelector.getCookieInfo(Unknown Source)
at com.sun.deploy.net.cookie.DeployCookieSelector.get(Unknown Source)
at sun.net.www.protocol.http.HttpURLConnection.setCookieHeader(Unknown Source)
at sun.net.www.protocol.http.HttpURLConnection.writeRequests(Unknown Source)
at sun.net.www.protocol.http.HttpURLConnection.getInputStream(Unknown Source)
at org.dbwiki.web.applet.ValueRequester.doInBackground(ValueRequester.java:40)
at org.dbwiki.web.applet.ValueRequester.doInBackground(ValueRequester.java:1)
at javax.swing.SwingWorker$1.call(Unknown Source)
at java.util.concurrent.FutureTask$Sync.innerRun(Unknown Source)
at java.util.concurrent.FutureTask.run(Unknown Source)
at javax.swing.SwingWorker.run(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)
而且之後每一個上面附加的消息顯示異常被拋出:
sun.plugin2.main.client.PluginMain: unrecognized message ID 46
有趣的事情是例外程序在運行時才拋出瀏覽器作爲一個applet,如果程序從api作爲applet運行,則不會引發異常。
我StringWorker:
package org.dbwiki.web.applet;
import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.net.URL;
import java.net.URLConnection;
import java.util.ArrayList;
import javax.swing.SwingWorker;
public class ValueRequester extends SwingWorker<Void, Void> {
HtmlGenerator htmlGen;
ArrayList<String[]> versionsData;
String id;
private String dbName;
ValueRequester (HtmlGenerator htmlGen, ArrayList<String[]> versionData, int ver){
try {
this.htmlGen=htmlGen;
if (TreeVisualiser.typeParameter.equals(TreeVisualiser.StructureVisualiserParameter))
this.id=htmlGen.getElem().getVersionElementId(ver);
else if(TreeVisualiser.typeParameter.equals(TreeVisualiser.HistoryVisualiserParameter))
this.id=htmlGen.getElem().getId();
this.dbName=htmlGen.getElem().getDBName();
this.versionsData=versionData;
} catch (Exception e) {
e.printStackTrace();
}
}
protected Void doInBackground() throws Exception {
try{
String value="";
URL historyURL = new URL("http://127.0.0.1:8080/"+dbName+id+"?value");
URLConnection hc = historyURL.openConnection();
BufferedReader in = new BufferedReader(new InputStreamReader(hc.getInputStream()));
String line;
while ((line = in.readLine()) != null) {
value+=line;
}
in.close();
this.htmlGen.formDisplayerHead();
this.htmlGen.formNodeDataHtml(value,this.versionsData);
this.htmlGen.formDisplayerTail();
}
catch(Exception e)
{
e.printStackTrace();
}
return null;
}
protected void done()
{
if (!this.isCancelled())
this.htmlGen.dataDisplayer.setText(this.htmlGen.getHtml());
}
}
我現在的想法是什麼原因呢,該如何處理呢,或者至少如何隱藏它(因爲一切正常)。任何幫助,將不勝感激。
UPDATE:
我試圖抓住這個異常的ValueRequester.doInBackround(),但我的catch語句不捕獲異常。我更新doInBackground()的代碼:
protected Void doInBackground() throws Exception {
try{
String value="";
URL historyURL = new URL("http://127.0.0.1:8080/"+dbName+id+"?value");
URLConnection hc = historyURL.openConnection();
InputStream inputStrm=hc.getInputStream();
InputStreamReader inputStrmRdr= new InputStreamReader(inputStrm);
this.in = new BufferedReader(inputStrmRdr);
String line;
while ((line = in.readLine()) != null) {
value+=line;
}
this.htmlGen.formDisplayerHead();
this.htmlGen.formNodeDataHtml(value,this.versionsData);
this.htmlGen.formDisplayerTail();
}catch (InterruptedException e){
System.out.println("Interrupted Exception caught!");
// e.printStackTrace();
}
return null;
}
不幸的是堆棧跟蹤還是印刷的,而不是我的系統出的消息。任何想法在這裏可能是錯的?
悄悄返回這不是完整的堆棧跟蹤,是嗎?實際上你得到的是由此InterrupedException導致的IOException,對吧? – 2012-07-05 10:34:09