从某网站下载MP3的例子

从某网站下载MP3的例子。为安全起见，将网站信息匿了。

package tools.download;

import java.io.BufferedInputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLConnection;

public class DownloadMP3 {
	private static final String SITE = ...
	private static final String SAVE_PATH = ...
	private static int BUFFER_SIZE = 1024 * 8;

	public boolean downloadSrc(String strURL, String saveFile) {

		// strURL validation ....

		BufferedInputStream bis = null;
		FileOutputStream fos = null;
		byte[] buf = new byte[BUFFER_SIZE];

		try {
			File dir = new File(saveFile);
			
			if (!(dir.exists()) && !(dir.isDirectory())) {
				boolean created = dir.mkdirs();
				if (created) {
					System.out.println("创建文件夹成功!");
				} else {
					System.out.println("创建文件夹失败!");
				}
			}
			
			int lastIndex = strURL.lastIndexOf("/");
			saveFile = saveFile + strURL.substring(lastIndex + 1);

			URL url = new URL(strURL);
			URLConnection con = url.openConnection();
			long len = con.getContentLength();

			con.connect();
			bis = new BufferedInputStream(con.getInputStream());
			fos = new FileOutputStream(saveFile);

			int size = 0;
			int progress = 0;
			while ((size = bis.read(buf)) != -1) {
				// System.out.print("_");
				fos.write(buf, 0, size);
				progress++;
				System.out.print(".");
				if (progress % 80 == 0) {
					System.out.print("\n");
					progress = 0;
				}
			}
			fos.close();
			bis.close();

			File fsaved = new File(saveFile);
			long fileLen = fsaved.length();

			if (progress > 0)
				System.out.print("\n");
			System.out.println(len);
			System.out.println(fileLen);

			if (len == fileLen) {
				return true;
			} else {
				return false;
			}
		} catch (MalformedURLException e) {
			e.printStackTrace();
		} catch (IOException e) {
			e.printStackTrace();
		} finally {
			if (fos != null) {
				try {
					fos.close();
				} catch (IOException e) {
					e.printStackTrace();
				}
			}
			if (bis != null) {
				try {
					bis.close();
				} catch (IOException e) {
					e.printStackTrace();
				}
			}
		}

		return false;
	}

	/**
	 * Specific download
	 */
	public void downloadSite() {
		final int V = 34;

		final int MAX_TUNES = 20;
		
		int total = 0, failed = 0, success = 0; 

		for (int i = 1; i <= MAX_TUNES; i++) {
			String strURL = ...
			
			String saveFile = ...

			System.out.println(strURL);
			boolean successful = downloadSrc(strURL, saveFile);
			total ++;
			if (successful) {
				success++;
				System.out.println("Done - " + saveFile + "\n");
			} else {
				failed++;
				System.out.println("Failed.\n");
			}
		}
		System.out.println("Total: " + total + "; succeed: " + success + "; failed: " + failed);
	}

	public static void main(String[] args) {
		DownloadMP3 dlmp3 = new DownloadMP3();
		dlmp3.downloadSite();
	}
}