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/**
 * 
 */
package de.tutorials;

import java.io.IOException;
import java.lang.reflect.Field;
import java.net.HttpURLConnection;
import java.net.URL;

import sun.net.www.MessageHeader;

/**
 * @author Tom
 * 
 */
public class GetFileNameExample {

	/**
	 * @param args
	 */
	public static void main(String[] args) throws Exception {
		URL url = new URL(
				"http://www.tutorials.de/forum/attachments/java/23219-aspectj5_example.zip?d=1141398346");
		System.out.println(getFilenameFromResponse(url));
	}

	/**
	 * @param url
	 * @return
	 * @throws IOException
	 * @throws NoSuchFieldException
	 * @throws IllegalAccessException
	 */
	private static String getFilenameFromResponse(URL url) throws IOException,
			NoSuchFieldException, IllegalAccessException {
		HttpURLConnection httpURLConnection = (HttpURLConnection) url
				.openConnection();

		httpURLConnection.connect();
		// System.out.println(
		httpURLConnection.getResponseMessage();
		// );
		Field responsesField = sun.net.www.protocol.http.HttpURLConnection.class
				.getDeclaredField("responses");
		responsesField.setAccessible(true);
		MessageHeader responses = (MessageHeader) responsesField
				.get(httpURLConnection);
		int contentDispositionIdx = responses.getKey("Content-disposition");
		String filename = responses.getValue(contentDispositionIdx).replaceAll(
				".*filename=\"(.*)\"", "$1");
		return filename;
	}
}