java下载网络资源

package com.io;
import java.io.*;
import java.net.*;
import java.util.*;
public class HttpGet {
public final static boolean DEBUG = true;
private static int BUFFER_SIZE = 8096;
private Vector<String> vDownLoad = new Vector<String>();
private Vector<String> vFileList = new Vector<String>();

public HttpGet() {

}

public void resetList() {
vDownLoad.clear();
vFileList.clear();
}

public void addItem(String url, String filename) {
vDownLoad.add(url);
vFileList.add(filename);
}
public void downLoadByList() {
String url = null;
String filename = null;

for (int i = 0; i < vDownLoad.size(); i++) {
url = vDownLoad.get(i);
filename = 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!!!");

}
}

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();
//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 (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);

}


/**
* 主方法(用于测试)
*
* @param argv String[]
*/
public static void main(String argv[]) {

HttpGet oInstance = new HttpGet();
try {
String url = "http://10.166.112.167:8080/portalapp/book_file/2358/137262358/137262367/20100826193207/file2.dmh";
oInstance.saveToFile(url,"D:/11");
//开始下载
oInstance.downLoadByList();
}
catch (Exception err) {
System.out.println(err.getMessage());
}

}

}