ProxyAuthenticator.java Source code

Introduction

Here is the source code for ProxyAuthenticator.java

Source

import java.io.FileOutputStream;
import java.io.InputStream;
import java.net.Authenticator;
import java.net.HttpURLConnection;
import java.net.InetSocketAddress;
import java.net.PasswordAuthentication;
import java.net.Proxy;
import java.net.SocketAddress;
import java.net.URL;

class ProxyAuthenticator extends Authenticator {

    private String userName, password;

    public ProxyAuthenticator(String userName, String password) {
        this.userName = userName;
        this.password = password;
    }

    protected PasswordAuthentication getPasswordAuthentication() {
        return new PasswordAuthentication(userName, password.toCharArray());
    }
}

public class Main {
    public static void main(String[] args) throws Exception {
        downloadFromUrl("http://www.java2s.com/style/download.png");
    }

    private static String getOutputFileName(URL url) {
        String[] urlParts = url.getPath().split("/");
        return "c:/temp/" + urlParts[urlParts.length - 1];
    }

    private static void downloadFromUrl(String urlString) throws Exception {
        InputStream is = null;
        FileOutputStream fos = null;

        URL url = new URL(urlString);

        System.out.println("Reading..." + url);

        Authenticator.setDefault(new ProxyAuthenticator("username", "password"));

        SocketAddress addr = new InetSocketAddress("your proxyserver ip address", 80);
        Proxy proxy = new Proxy(Proxy.Type.HTTP, addr);

        HttpURLConnection conn = (HttpURLConnection) url.openConnection(proxy);

        is = conn.getInputStream();

        String filename = getOutputFileName(url);

        fos = new FileOutputStream(filename);

        byte[] readData = new byte[1024];

        int i = is.read(readData);

        while (i != -1) {
            fos.write(readData, 0, i);
            i = is.read(readData);
        }

        System.out.println("Created file: " + filename);
        System.out.println("Completed");
    }
}