Reading Website Content
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Question / Problem
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The following error occurs while reading a website content through java code.
java.net.UnknownHostException: <website name>
at java.net.PlainSocketImpl.connect(Unknown Source)
at java.net.Socket.connect(Unknown Source)
at java.net.Socket.connect(Unknown Source)
at sun.net.NetworkClient.doConnect(Unknown Source)
at sun.net.www.http.HttpClient.openServer(Unknown Source)
at sun.net.www.http.HttpClient.openServer(Unknown Source)
at sun.net.www.http.HttpClient.<init>(Unknown Source)
at sun.net.www.http.HttpClient.New(Unknown Source)
at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(Unknown Source)
at sun.net.www.protocol.http.HttpURLConnection.plainConnect(Unknown Source)
at sun.net.www.protocol.http.HttpURLConnection.connect(Unknown Source)
at sun.net.www.protocol.http.HttpURLConnection.getInputStream(Unknown Source)
at websiteReader.URLUtils.dump(URLUtils.java:89)
at websiteReader.URLUtils.main(URLUtils.java:9)
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Solution
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This is because your proxy server requires the authentication. You can use the following code and can check with your administrator for any detailed information regarding the proxy settings.
try
{
System.setProperty("java.net.useSystemProxies", "true");
List l = null;
try {
l = ProxySelector.getDefault().select(new URI("http://www.yahoo.com"));
}
catch (URISyntaxException e) {
e.printStackTrace();
}
if (l != null) {
for (Iterator iter = l.iterator(); iter.hasNext();) {
java.net.Proxy proxy = (java.net.Proxy) iter.next();
System.out.println("proxy hostname : " + proxy.type());
InetSocketAddress addr = (InetSocketAddress) proxy.address();
if (addr == null) {
System.out.println("No Proxy");
}
else {
System.out.println("proxy hostname : " + addr.getHostName());
System.out.println("proxy port : " + addr.getPort());
/* URL url = new URL("http://internal.server.local/");
URLConnection conn = url.openConnection(Proxy.NO_PROXY);*/
System.getProperties().put("http.proxyHost", "ipaddress");
System.getProperties().put("http.proxyPort", addr.getPort());
System.getProperties().put("http.proxyUser", "username");
System.getProperties().put("http.proxyPassword", "password");
URL yahoo = new URL("http://www.yahoo.com/");
BufferedReader in = new BufferedReader(
new InputStreamReader(
yahoo.openStream()));
String inputLine;
while ((inputLine = in.readLine()) != null)
System.out.println(inputLine);
in.close();
}
}
}
}
catch(Exception e) { e.printStackTrace(); }
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Applies to |
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Core Java
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Rank It |
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