java.net.ConnectException：通过代理连接时连接超时

Question

I am trying to download a zip file from a URL and store it in the local system using java code. I am also using system proxy for the same. Its unable to connect to the url. Any idea?

public static void main()
{
   try
   {
      long startTime = System.currentTimeMillis();

      System.out.println("Connecting to the url...\n");
      System.setProperty("http.proxyHost", " http://abc.com");
      System.setProperty("http.proxyPort","1111");

      URL url = new URL("http://sourceforge.net/projects/sevenzip/files/7-Zip/9.20/7z920.exe/download?use_mirror=nchc");
      url.openConnection();
      InputStream reader = url.openStream();
      FileOutputStream writer = new FileOutputStream("/home/user/result/apps.zip);
      byte[] buffer = new byte[153600];
      int totalBytesRead = 0;
      int bytesRead = 0;

      System.out.println("Reading ZIP file 150KB blocks at a time.\n");

      while ((bytesRead = reader.read(buffer)) > 0)
      {  
         writer.write(buffer, 0, bytesRead);
         buffer = new byte[153600];
         totalBytesRead += bytesRead;
      }

      long endTime = System.currentTimeMillis();

      System.out.println("Done downloading. " + (new Integer(totalBytesRead).toString()) + " bytes read (" + (new Long(endTime - startTime).toString()) + " millseconds).\n");
      writer.close();
      reader.close();
   }
   catch (MalformedURLException e)
   {
      e.printStackTrace();
   }
   catch (IOException e)
   {
      e.printStackTrace();
   }
   unZip(INPUT_ZIP_FILE);

}

i get the following error:

java.net.ConnectException: Connection timed out
    at java.net.PlainSocketImpl.socketConnect(Native Method)
    at java.net.PlainSocketImpl.doConnect(PlainSocketImpl.java:351)
    at java.net.PlainSocketImpl.connectToAddress(PlainSocketImpl.java:213)
    at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:200)
    at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:366)
    at java.net.Socket.connect(Socket.java:529)
    at java.net.Socket.connect(Socket.java:478)
    at sun.net.NetworkClient.doConnect(NetworkClient.java:163)
    at sun.net.www.http.HttpClient.openServer(HttpClient.java:394)
    at sun.net.www.http.HttpClient.openServer(HttpClient.java:529)
    at sun.net.www.http.HttpClient.<init>(HttpClient.java:233)
    at sun.net.www.http.HttpClient.New(HttpClient.java:306)
    at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:977)
    at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:925)
    at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:836)
    at sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:1172)
    at java.net.URL.openStream(URL.java:1010)
    at test.main(test.java:33)

It says unknown host when i try to ping the url, but i am able to ping urls like www.google.com

Answer 1

试试这个页面如何使用代理 - 看起来很全面。

Answer 2

I think you are behind some firewall because your code is running perfectly in my local machine. I have not done any changes in your code. The zip file is downloaded in my local machine. The console shows this message:

Connecting to the url...

Reading ZIP file 150KB blocks at a time.

Done downloading. 1110476 bytes read (13816 millseconds).