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I am trying to download a xml text file from a web server using this method:
static void download (String url , String fileName) throws IOException{
FileWriter xmlWriter;
xmlWriter = new FileWriter(fileName);
System.out.println("URL to download is : " + url);
// here Exception is thrown/////////////////////////////////
BufferedReader inputTxtReader = new BufferedReader
(new BufferedReader(new InputStreamReader(addURL.openStream())));
////////////////////////////////////////////////////////
String str ;
String fileInStr = "";
str = inputTxtReader.readLine();
while (!(str == null) ){///&& !(str.equals("</tv>"))
fileInStr += (str + "\r\n");
str = inputTxtReader.readLine();
}
xmlWriter.write(fileInStr);
xmlWriter.flush();
xmlWriter.close();
System.out.println("File Downloaded");
}
Sometimes this exception is thrown (where I specified is code):
java.net.SocketException: Network is unreachable: connect
at java.net.PlainSocketImpl.socketConnect(Native Method)
at java.net.PlainSocketImpl.doConnect(PlainSocketImpl.java:333)
at java.net.PlainSocketImpl.connectToAddress(PlainSocketImpl.java:195)
at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:182)
at java.net.Socket.connect(Socket.java:518)
at java.net.Socket.connect(Socket.java:468)
at sun.net.NetworkClient.doConnect(NetworkClient.java:157)
at sun.net.www.http.HttpClient.openServer(HttpClient.java:389)
at sun.net.www.http.HttpClient.openServer(HttpClient.java:516)
at sun.net.www.http.HttpClient.<init>(HttpClient.java:233)
at sun.net.www.http.HttpClient.New(HttpClient.java:306)
at sun.net.www.http.HttpClient.New(HttpClient.java:318)
at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:788)
at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:729)
at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:654)
at sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:977)
at java.net.URL.openStream(URL.java:1009)
at MessagePanel.download(MessagePanel.java:640)
at WelcomThread.run(MainBody2.java:891)
Please guide me
Thank you all.
723
Now in order to get rid off of the java.net.SocketException to get proper output then it can be perceived via as if you are a client and getting this error while connecting to the server-side application then append the following changes as follows: First, check if the Server is running by doing telnet on the host port on which the server runs.
This SocketException occurs on the server-side when the client closed the socket connection before the response could be returned over the socket. For example, by quitting the browser before the response was retrieved. Connection reset simply means that a TCP RST was received.
First, let us see the possible reasons for the occurrence of java.net.ConnectException: Connection refused. As client and server involved, both should in a network like LAN or internet. If it is not present, it will throw an exception on the client-side. If the server is not running.
java.net.SocketException: Connection reset This SocketException occurs on the server-side when the client closed the socket connection before the response could be returned over the socket. For example, by quitting the browser before the response was retrieved. Connection reset simply means that a TCP RST was received.
You are facing a connection breakdown. Does this happen in 3G, WiFi or "plain" connection on a computer?
Anyway, you must assume that the connection may be lost from time to time, when writing your app. For example, with mobiles, this happens frequently in the tube, in basements, etc. With PC apps, this is less frequent but occurs sometimes.
A retry can be a good solution. And a clean error message that explains the network is not available at this moment too.
150
I faced situation of getting java.net.SocketException not sometimes but every time. I've added -Djava.net.preferIPv4Stack=true to java command line and my program started to work properly.
21
"Network is unreachable" means just that. You're not connected to a network. It's something outside of your program. Could be a bad OS setting, NIC, router, etc.
35
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