import java.io.*;

import java.util.*;

import java.net.*;

public class WebTest {

    public static void main(String[] args) {

        System.out.println("beging...");

        DownLoadPages("http://login.xiaonei.com/Login.do", "d:/fileDown.txt");

        // visit("http://www.xiaonei.com");

        System.out.println("end.");

    }

    public static void DownLoadPages(String urlStr, String outPath) {

        int chByte = 0;

        URL url = null;

        HttpURLConnection httpConn = null;

        InputStream in = null;

        FileOutputStream out = null;

        try {

            String post = "email=" + URLEncoder.encode("e-mail", "UTF-8")

                    + "&password=" + "password";

            url = new URL(urlStr);

            httpConn = (HttpURLConnection) url.openConnection();

            //setInstanceFollowRedirects can then be used to set if

            //redirects should be followed or not and this should be used before the

            //connection is established (via getInputStream, getResponseCode, and other

            //methods that result in the connection being established).

            httpConn.setFollowRedirects(false);

            //inorder to disable the redirects

            httpConn.setInstanceFollowRedirects(false);

            httpConn.setDoOutput(true);

            httpConn.setDoInput(true);

            httpConn.setRequestProperty("User-Agent",

                    "Mozilla/5.0 (compatible; MSIE 6.0; Windows NT)");

            httpConn.setRequestProperty("Content-Type",

                    "application/x-www-form-urlencoded");

            //ok now, we can post it

            PrintStream send = new PrintStream(httpConn.getOutputStream());

            send.print(post);

            send.close();

            URL newURL = new URL(httpConn.getHeaderField("Location"));

            System.out.println("the URL has move to "

                    + httpConn.getHeaderField("Location"));

            httpConn.disconnect();

            //             OK, now we are ready to get the cookies out of the URLConnection

            String cookies = getCookies(httpConn);

            System.out.println(cookies);

            httpConn = (HttpURLConnection) newURL.openConnection();

            httpConn.setRequestProperty("User-Agent",

                    "Mozilla/5.0 (compatible; MSIE 6.0; Windows NT)");

            httpConn.setRequestProperty("Content-Type",

                    "application/x-www-form-urlencoded");

            httpConn.setRequestProperty("Cookie", cookies);

            httpConn.setDoInput(true);

            in = httpConn.getInputStream();

            out = new FileOutputStream(new File(outPath));

            chByte = in.read();

            while (chByte != -1) {

                out.write(chByte);

                //System.out.println(chByte);

                chByte = in.read();

            }

        } catch (Exception e) {

            e.printStackTrace();

        }

    }

    public static String getCookies(HttpURLConnection conn) {

        StringBuffer cookies = new StringBuffer();

        String headName;

        for (int i = 7; (headName = conn.getHeaderField(i)) != null; i++) {

            StringTokenizer st = new StringTokenizer(headName, "; ");

            while (st.hasMoreTokens()) {

                cookies.append(st.nextToken() + "; ");

            }

        }

        return cookies.toString();

    }

}