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import java.io.DataInputStream;
import java.io.FileOutputStream;
import java.net.URL;
import java.net.URLConnection;
public class Main {
public static void main(String args[]) throws Exception {
byte[] b = new byte[1];
URL url = new URL("http://www.server.com/a.gif");
URLConnection urlConnection = url.openConnection();
urlConnection.connect();
DataInputStream di = new DataInputStream(urlConnection.getInputStream());
FileOutputStream fo = new FileOutputStream("a.gif");
while (-1 != di.read(b, 0, 1))
fo.write(b, 0, 1);
di.close();
fo.close();
}
}
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