java 从网络Url中下载文件

public static void main(String[] args) { try { downLoadFromUrl("https://wenku.baidu.com/view/e745823bf46527d3240ce0fd", "text.txt", "D:/"); } catch (Exception e) { // TODO: handle exception } } /** * 从网络Url中下载文件 * * @param urlStr * @param fileName * @param savePath * @throws IOException */ public static void downLoadFromUrl(String urlStr, String fileName, String savePath) throws IOException { URL url = new URL(urlStr); HttpURLConnection conn = (HttpURLConnection) url.openConnection(); // 设置超时间为3秒 conn.setConnectTimeout(3 * 1000); // 防止屏蔽程序抓取而返回403错误 conn.setRequestProperty("User-Agent", "Mozilla/4.0 (compatible; MSIE 5.0; Windows NT; DigExt)"); // 得到输入流 InputStream inputStream = conn.getInputStream(); // 获取自己数组 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(); byte[] getData = bos.toByteArray(); // 文件保存位置 File saveDir = new File(savePath); if (!saveDir.exists()) { saveDir.mkdir(); } File file = new File(saveDir + File.separator + fileName); FileOutputStream fos = new FileOutputStream(file); fos.write(getData); if (fos != null) { fos.close(); } if (inputStream != null) { inputStream.close(); } System.out.println("info:" + url + " download success"); } /** * 从输入流中获取字节数组 * * @param inputStream * @return * @throws IOException */ 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(); }