Java Networking - Web Client Example
This program fetches the content referenced by the specified URL and writes it to STDOUT.
This example demonstrates the use of URLs, URLConnections, and InputStreams.
import java.io.InputStream;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLConnection;
/**
* This program fetches the content referenced by the specified URL and
* writes it to STDOUT.
*/
public class WebClient {
public static void main(String[] args) {
if (args.length != 1) {
System.err.println("Usage: WebClient <url>");
} else {
try {
fetch(new URL(args[0]));
} catch (MalformedURLException e) {
System.err.println("Malformed URL: " + args[0]);
} catch (IOException e) {
System.err.println("Failed to fetch URL " + args[0] + ": "
+ e.getMessage());
e.printStackTrace();
}
}
}
private static void fetch(URL url) throws IOException {
URLConnection connection = url.openConnection();
connection.connect();
InputStream in = connection.getInputStream();
try {
byte[] buf = new byte[1024];
int nread = 0;
while ((nread = in.read(buf)) > 0) {
System.out.write(buf, 0, nread);
}
System.out.flush();
} finally {
in.close();
}
}
}
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