java下载源码下载_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());  } }}