java在SwingWorker（doInBackground）中从WorkerThread调用多个方法？

Question

我是线程新手，想使用SwingWorker更新我的GUI，而另一个线程正在分析一些html和下载文件

这是我的密码：

protected Void doInBackground() throws Exception {

    analyzeHTML();
    download();

    return null;
}

整个呼叫有时会失败：

   SEVERE: null
java.net.SocketTimeoutException: Read timed out
    at java.net.SocketInputStream.socketRead0(Native Method)
    at java.net.SocketInputStream.read(SocketInputStream.java:150)
    at java.net.SocketInputStream.read(SocketInputStream.java:121)
    at java.io.BufferedInputStream.fill(BufferedInputStream.java:235)
    at java.io.BufferedInputStream.read1(BufferedInputStream.java:275)
    at java.io.BufferedInputStream.read(BufferedInputStream.java:334)
    at sun.net.www.http.HttpClient.parseHTTPHeader(HttpClient.java:633)
    at sun.net.www.http.HttpClient.parseHTTP(HttpClient.java:579)
    at sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:1322)
    at java.net.HttpURLConnection.getResponseCode(HttpURLConnection.java:468)
    at org.jsoup.helper.HttpConnection$Response.execute(HttpConnection.java:429)
    at org.jsoup.helper.HttpConnection$Response.execute(HttpConnection.java:446)
    at org.jsoup.helper.HttpConnection$Response.execute(HttpConnection.java:446)
    at org.jsoup.helper.HttpConnection$Response.execute(HttpConnection.java:410)
    at org.jsoup.helper.HttpConnection.execute(HttpConnection.java:164)
    at org.jsoup.helper.HttpConnection.get(HttpConnection.java:153)
    at hanserdownloader.LinkProcessorThread.analyzeHTML(LinkProcessorThread.java:208)
    at hanserdownloader.LinkProcessorThread.doInBackground(LinkProcessorThread.java:139)
    at hanserdownloader.LinkProcessorThread.doInBackground(LinkProcessorThread.java:113)
    at javax.swing.SwingWorker$1.call(SwingWorker.java:296)
    at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:334)
    at java.util.concurrent.FutureTask.run(FutureTask.java:166)
    at javax.swing.SwingWorker.run(SwingWorker.java:335)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
    at java.lang.Thread.run(Thread.java:722)

所以我的问题是：

当从/doInBackground（）调用上述两个方法时，它们是否也在工作线程中运行。应该是吧

这似乎是一个愚蠢的问题，但我有点不确定，如果这个超时错误不是由线程混乱（而不是真正的http超时）造成的

谢谢你的帮助

Answer 1

是，doInBackground正在事件调度线程之外的单独线程中运行。您调用的任何方法都将在同一线程上下文中调用，除非您以某种方式对其进行更改

因此，如果一切顺利，首先将调用analyzeHTML，当它完成时，将调用download

但这也取决于，在您的示例中，如果第一个方法抛出相同类型的Exception，则第二个方法将不会被调用

Answer 2

这两个方法在工作线程中运行，但顺序不同。因此，首先在工作线程内调用analyzeHTML，然后在完成后，在同一线程中调用download