Java：使用URL下载图片为何图片下载不完全呢？-PHP Chinese Network Q&A

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Java：使用URL下载图片为何图片下载不完全呢？

黄舟 2017-04-18 10:51:10

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public class Client { public static void main(String[] args) { try { URL url = new URL("http://www.iteye.com/upload/logo/user/1177132/a7159cc1-b11a-3122-9a9d-5183d6c6ba99.jpg"); HttpURLConnection connection = (HttpURLConnection) url.openConnection(); connection.setConnectTimeout(5 * 1000); InputStream inputStream = connection.getInputStream(); byte[] tmp = new byte[1024]; int length; OutputStream outputStream = new FileOutputStream("E:" + File.separator + "eee.jpg"); while ((length = inputStream.read(tmp)) != -1) { outputStream.write(tmp, 0, length); } outputStream.close(); inputStream.close(); } catch (Exception e) { e.printStackTrace(); } } }

图片URL：
http://www.iteye.com/upload/l...
图片有3K，但我下载后图片只有2K而且图片是错误的这是为什么呢？

黄舟

人生最曼妙的风景，竟是内心的淡定与从容！

reply all (3)

小葫芦2017-04-18 10:53:10 3 floor

Try changing the code to this

public class Client { public static void main(String[] args) { try { URL url = new URL("http://www.iteye.com/upload/logo/user/1177132/a7159cc1-b11a-3122-9a9d-5183d6c6ba99.jpg"); HttpURLConnection connection = (HttpURLConnection) url.openConnection(); connection.setRequestProperty("User-Agent", "Mozilla/5.0 (Windows NT 6.1; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/58.0.3029.19 Safari/537.36"); connection.setConnectTimeout(5 * 1000); InputStream inputStream = connection.getInputStream(); byte[] tmp = new byte[1024]; int length; OutputStream outputStream = new FileOutputStream("E:" + File.separator + "eee.jpg"); while ((length = inputStream.read(tmp)) != -1) { outputStream.write(tmp, 0, length); } outputStream.close(); inputStream.close(); } catch (Exception e) { e.printStackTrace(); } } }

The file downloaded without adding UA is actually like this

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PHPzhong2017-04-18 10:53:10 2 floor

outputStream.close()之前，先调用outputStream.flush(), this method can force all output stream buffers to be written out. What you said before is correct, there is only one step missing.

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