用Java实现HTTP文件队列下载

import java.io.*;
    import java.net.*;
    import java.util.*;
    /** * p>
    Title: 个人开发的API/p>
     * p>
    Description: 将指定的HTTP网络资源在本地以文件形式存放/p>
     * p>
    Copyright: Copyright (c) 2004/p>
     * p>
    Company: NewSky/p>
 * @author MagicLiao * @version 1.0 */public class HttpGet {
      public final static boolean DEBUG = true;
    //调试用  private static int BUFFER_SIZE = 8096;
    //缓冲区大小  private Vector vDownLoad = new Vector();
    //URL列表  private Vector vFileList = new Vector();
//下载后的保存文件名列表  /**   * 构造方法   */  public HttpGet() {
  }
  /**   * 清除下载列表   */  public void resetList() {
        vDownLoad.clear();
        vFileList.clear();
  }
  /**   * 增加下载列表项   *   * @param url String   * @param filename String   */  public void addItem(String url, String filename) {
        vDownLoad.add(url);
        vFileList.add(filename);
  }
  /**   * 根据列表下载资源   */  public void downLoadByList() {
        String url = null;
        String filename = null;
            //按列表顺序保存资源    for (int i = 0;
     i  vDownLoad.size();
 i++) {
          url = (String) vDownLoad.get(i);
          filename = (String) vFileList.get(i);
      try {
            saveToFile(url, filename);
      }
      catch (IOException err) {
        if (DEBUG) {
              System.out.println("资源[" + url + "]下载失败!!!");
        }
      }
    }
    if (DEBUG) {
          System.out.println("下载完成!!!");
    }
  }
  /**   * 将HTTP资源另存为文件   *   * @param destUrl String   * @param fileName String   * @throws Exception   */  public void saveToFile(String destUrl, String fileName) throws IOException {
        FileOutputStream fos = null;
        BufferedInputStream bis = null;
        HttpURLConnection httpUrl = null;
        URL url = null;
        byte[] buf = new byte[BUFFER_SIZE];
        int size = 0;
            //建立链接    url = new URL(destUrl);
        httpUrl = (HttpURLConnection) url.openConnection();
        //连接指定的资源    httpUrl.connect();
        //获取网络输入流    bis = new BufferedInputStream(httpUrl.getInputStream());
        //建立文件    fos = new FileOutputStream(fileName);
        if (this.DEBUG) System.out.println("正在获取链接[" + destUrl + "]的内容...\n将其保存为文件[" + fileName + "]");
        //保存文件    while ( (size = bis.read(buf)) != -1)       fos.write(buf, 0, size);
            fos.close();
        bis.close();
        httpUrl.disconnect();
  }
  /**   * 设置代理服务器   *   * @param proxy String   * @param proxyPort String   */  public void setProxyServer(String proxy, String proxyPort) {
        //设置代理服务器    System.getProperties().put("proxySet", "true");
        System.getProperties().put("proxyHost", proxy);
        System.getProperties().put("proxyPort", proxyPort);
  }
  /**   * 设置认证用户名与密码   *   * @param uid String   * @param pwd String   */  public void setAuthenticator(String uid, String pwd) {
        Authenticator.setDefault(new MyAuthenticator(uid, pwd));
  }
  /**   * 主方法(用于测试)   *   * @param argv String[]   */  public static void main(String argv[]) {
        HttpGet oInstance = new HttpGet();
try {
    //增加下载列表（此处用户可以写入自己代码来增加下载列表）oInstance.addItem("http://www.ebook.com/java/网络编程001.zip","./网络编程1.zip");
    oInstance.addItem("http://www.ebook.com/java/网络编程002.zip","./网络编程2.zip");
    oInstance.addItem("http://www.ebook.com/java/网络编程003.zip","./网络编程3.zip");
    oInstance.addItem("http://www.ebook.com/java/网络编程004.zip","./网络编程4.zip");
    oInstance.addItem("http://www.ebook.com/java/网络编程005.zip","./网络编程5.zip");
    oInstance.addItem("http://www.ebook.com/java/网络编程006.zip","./网络编程6.zip");
    oInstance.addItem("http://www.ebook.com/java/网络编程007.zip","./网络编程7.zip");
    //开始下载oInstance.downLoadByList();
    }
    catch (Exception err) {
          System.out.println(err.getMessage());
    }
  }
}