http下载java源码

package HttpDownFile;

import java.io.*;
import java.net.*;
import java.util.*;

public class test1 {
 public final static boolean DEBUG = true;// use test
 private static int BUFFER_SIZE = 8096;// buffer size
 private Vector vDownLoad = new Vector();// URL list
 private Vector vFileList = new Vector();// Download file list

 /**
  * clear download list
  */
 public void resetList() {
  this.vDownLoad.clear();
  this.vFileList.clear();
 }

 /**
  * add download list
  * @param url String
  * @param filename String
  */
 public void addItem(String url, String filename) {
  this.vDownLoad.add(url);
  this.vFileList.add(filename);
 }

 /**
  * download file
  */
 public void downLoadByList() {
  String url = null;
  String filename = null;

  for (int i = 0; i < this.vDownLoad.size(); i++) {
   url = (String) this.vDownLoad.get(i);
   filename = (String) this.vFileList.get(i);
   try {
    saveToFile(url, filename);
   } catch (IOException err) {
    if (DEBUG) {
     System.out.println("[" + url + "] download error!!!");
    }
   }
  }
  if (DEBUG) {
   System.out.println("Download success!!!");
  }
 }

 /**
  * @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;

  url = new URL(destUrl);
  httpUrl = (HttpURLConnection) url.openConnection();
  httpUrl.connect();
  bis = new BufferedInputStream(httpUrl.getInputStream());
  fos = new FileOutputStream(fileName);
  if (DEBUG)
   System.out.println("Connecting [" + destUrl + "].../nSave file["
     + fileName + "]");

  while ((size = bis.read(buf)) != -1)
   fos.write(buf, 0, size);

  fos.close();
  bis.close();
  httpUrl.disconnect();
 }

 /**
  * @param argv String[]
  */
 public static void main(String argv[]) {
  test1 oInstance = new test1();
  try {
   oInstance.addItem("要下载的文件地址", "文件保存地址和文件名");
   oInstance.downLoadByList();
  } catch (Exception err) {
   System.out.println(err.getMessage());
  }
 }
}