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Thread: Read XML from Internet Hang

  1. #1
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    Unhappy Read XML from Internet Hang

    Hi everyone, I'm a bit new in Java.

    I have the following code which will read a php responded XML file.
    It's running under a timer in 10 seconds (for checking a message from server)
    Everything is OK when the Internet line smooth, When the internet line disconnected, some this it's return error but still OK because it's going back to normal when the Internet line resume.

    But sometime when the Internet line not so smooth, The request will just hanging over there, including the timer also not moving untill you have to use "alt-Ctrl Delete" to end the entire application.

    Anybody know why? and how can i solve this problem.

    ##########################################
    public boolean send(String file,String action)
    { address += file + "?act=" + action + param;
    SAXParserFactory factory = SAXParserFactory.newInstance();
    XMLReader read = null;
    try{
    if(debug) System.out.println(address);
    SAXParser saxParser = factory.newSAXParser();
    read = saxParser.getXMLReader();
    saxParser.parse(address,DH);

    }catch(javax.xml.parsers.ParserConfigurationExcept ion e){
    e.printStackTrace();
    DH.msg = e.getMessage();
    // saxParser.
    }catch(java.io.IOException e){
    e.printStackTrace();
    DH.msg = e.getMessage();
    }catch(org.xml.sax.SAXException e){
    e.printStackTrace();
    DH.msg = e.getMessage();
    }
    return DH.status;
    }


  2. #2
    Super Moderator Json's Avatar
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    Default Re: Read XML from Internet Hang

    You need to be able to set some sort of timeout on your request to get the file. Whats the location of the file you are trying to pass into your XMLReader? Is the file somewhere on the internet?

    I'd refrain from doing it that way and instead using an HTTP request to get the file data and then use a SAXBuilder to build a jdom document from it.

    // Json

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    Default Re: Read XML from Internet Hang

    Yes, it's from internet, a php program.
    I'm wondering how can a set the time out?

    Thank

  4. #4
    Super Moderator Json's Avatar
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    Default Re: Read XML from Internet Hang

    So the address you are passing in to your xmlReader.parse is an actual http link then I take it?

    I think you should use a normal urlConnection to get the data you need and then put it in a SAXBuilder.

    Here is a short example.

        public static void main(String[] args) throws Throwable {
            final URL url = new URL("http://svn.cometd.com/trunk/cometd-java/server/pom.xml");
            final URLConnection urlConnection = url.openConnection();
            urlConnection.setConnectTimeout(5000); // 5 seconds timeout
     
            final BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(urlConnection.getInputStream()));
     
            if (bufferedReader != null) {
                final StringBuilder stringBuilder = new StringBuilder();
                String line;
     
                while ((line = bufferedReader.readLine()) != null) {
                    stringBuilder.append(line);
                }
     
                bufferedReader.close();
     
                final SAXBuilder builder = new SAXBuilder();
                final Document document = builder.build(new StringReader(stringBuilder.toString()));
     
                // You now have a JDOM document, use it as you please :)
                System.out.println(new XMLOutputter(Format.getPrettyFormat()).outputString(document));
            }
        }

    // Json

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    Default Re: Read XML from Internet Hang

    Thank you very much,
    I will try.

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    Default Re: Read XML from Internet Hang

    Hi Json,
    I already try the normal urlConnection as given above and i set the timeout to 2000 milisecond.
    I still face the same problem, my internet connection not stable, whenever the internet line slow of disconnected, the connection keep waiting and hang!

    by the way my application is actually pulling a message from an internet web (apache) server for any event happen. This pulling is running in a timer, initially i set the time to 10 second, I did increase the timer to 15 seconds but the connection hang still happen! any idea?

    it's because of the timer that I'm using?

    Thank

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    Super Moderator Json's Avatar
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    Default Re: Read XML from Internet Hang

    So if your connection disappears does the URL connection not throw an ioexception at you? Everything just hangs? That sounds strange.

    // Json

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    Default Re: Read XML from Internet Hang

    Hi Json,
    Yes, tha's happen, no exception, everything just stop there.
    u have any idea?

  9. #9
    Super Moderator Json's Avatar
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    Default Re: Read XML from Internet Hang

    Not a clue to be honest

    // Json

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