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import java.io.IOException;
 
import org.apache.commons.httpclient.HttpClient;
import org.apache.commons.httpclient.HttpException;
import org.apache.commons.httpclient.NameValuePair;
import org.apache.commons.httpclient.methods.PostMethod;
 
public class TinyUrl {
 
  /***************************************************************************
   * 來做一點javabean的基礎建設
   */
 
  private String longUrl;
 
  private String shortUrl;
 
  public TinyUrl() {
  }
 
  public String getLongUrl() {
    return longUrl;
  }
 
  public void setLongUrl(String longUrl) {
    this.longUrl = longUrl;
  }
 
  public String getShortUrl() {
    return this.shorten(this.getLongUrl());
  }
 
  public void setShortUrl(String shortUrl) {
    this.shortUrl = shortUrl;
  }
 
  /**
   * 這才是我們程式的核心所在
   * 
   * @param url
   * @return shortenUrl
   */
 
  private String shorten(String url) {
    
    /**********************************************************
     *  要這一行動起來, 你要有一些相依的library才行
     *  commons-logging
     *  commons-codec
     */ 
    HttpClient client = new HttpClient();
    
    
    /***********************************************************
     * 設定連線的站臺位置
     * 請別在"站臺位置"加了多餘的protocol
     * ex. setHost("http://tinyurl.com", 80, "http");
     * 不然他就噴UnknownHostException給你:P
     */
    client.getHostConfiguration().setHost("tinyurl.com", 80, "http");
 
    /***********************************************************
     * 觀察了表單內容是用post方法, 而使用的script name為create.php
     */
    PostMethod post = new PostMethod("/create.php");
    post.addParameter(new NameValuePair("url", url));
 
    
    String s = null;
    try {
      /***********************************************************
       * 透過http client來執行post/get方法
       */
      client.executeMethod(post);
      
      /***********************************************************
       * 再用您選用的方法傳回response body
       * 這裡偷懶了一下使用了getResponseBodyAsString()
       * log上會發出警告
       * 
       * 2006/5/18 上午 08:13:22 org.apache.commons.httpclient.HttpMethodBase getResponseBody
       * 警告: Going to buffer response body of large or unknown size. 
       * Using getResponseBodyAsStream instead is recommended.
       */
      s = post.getResponseBodyAsString();
    } catch (HttpException e) {
      // TODO Auto-generated catch block
      e.printStackTrace();
    } catch (IOException e) {
      // TODO Auto-generated catch block
      e.printStackTrace();
    }
    
    /***********************************************************
     * 以下是網頁的"解析"
     * 也是懶人法haha
     * 您也可以改成regular expression  
     */
    
    int start = s.indexOf("The following URL:");
    int end = s.indexOf("Open in new window");
    s = s.substring(start, end);
    start = s.indexOf("http://tinyurl.com");
    end = s.indexOf("</b><p>");
    s = s.substring(start, end);
    return s;
  }
 
  public static void main(String[] args) throws HttpException, IOException {
    TinyUrl tbean = new TinyUrl();
    tbean.setLongUrl("http://www.google.com.tw");
    System.out.println(tbean.getShortUrl());
  }
}