Java程式碼實現下載檔案

package test;

import java.io.ByteArrayOutputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.URL;

public class DownFiles {
	public static void downLoadFromUrl(String urlStr, String fileName, String savePath) throws IOException {
		URL url = new URL(urlStr);
		HttpURLConnection conn = (HttpURLConnection) url.openConnection();
		conn.setConnectTimeout(3000);
		conn.setRequestProperty("User-Agent", "Mozilla/4.0 (compatible; MSIE 5.0; Windows NT; DigExt)");
		InputStream inputStream = conn.getInputStream();
		byte[] getData = readInputStream(inputStream);
		java.io.File saveDir = new java.io.File(savePath);
		if (!saveDir.exists()) {
			saveDir.mkdir();
		}
		java.io.File file = new java.io.File(saveDir + java.io.File.separator + fileName);
		FileOutputStream fos = new FileOutputStream(file);
		fos.write(getData);
		if (fos != null) {
			fos.close();
		}
		if (inputStream != null) {
			inputStream.close();
		}
	}

	public static byte[] readInputStream(InputStream inputStream) throws IOException {
		byte[] buffer = new byte[1024];
		int len = 0;
		ByteArrayOutputStream bos = new ByteArrayOutputStream();
		while ((len = inputStream.read(buffer)) != -1) {
			bos.write(buffer, 0, len);
		}
		bos.close();
		return bos.toByteArray();
	}

	public static void main(String[] args) {
		// String downloadPath =
		// "https://wsqncdn.miaopai.com/stream/xTcKND2QIm7y5D68ULnBnsS0dNcsAYPYVGWZfA___32.mp4?ssig=dcb1a380303e53e9c0f0039d0b2357e8&time_stamp=1519627959219";
		String downloadPath = "http://img.blog.csdn.net/20170629101415530";
		// String name = "圖片.jpg";
		String name = "秒拍.mp4";
		String savePath = "e:/";
		try {
			downLoadFromUrl(downloadPath, name, savePath);
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	}
}
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