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POHow to read and calculate hash of file on the internet
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copied!<p>I have a url of a file on the Internet. I need to calculate the SHA1 hash, and read this file by each line. I know how to do this, but I read this file twice which probably isn't a very good solution. </p> <p>How can I do this more effectively?</p> <p>Here is my code:</p> <pre><code>URL url = new URL(url); URLConnection urlConnection = url.openConnection(); urlConnection.setConnectTimeout(1000); urlConnection.setReadTimeout(1000); logger.error(urlConnection.getContent() + " "); InputStream is = urlConnection.getInputStream(); // first reading of file is: int i; File file = new File("nameOfFile"); BufferedInputStream bis = new BufferedInputStream(is); BufferedOutputStream bos = new BufferedOutputStream(new FileOutputStream(file.getName())); while ((i = bis.read()) != -1) { bos.write(i); } bos.flush(); bis.close(); sha1(file); // second reading of file is: BufferedReader reader = new BufferedReader(new InputStreamReader(is)); String line; while ((line = reader.readLine()) != null) { // do something } protected byte[] sha1(final File file) throws Exception { if (file == null || !file.exists()) { return null; } final MessageDigest messageDigest = MessageDigest.getInstance(SHA1); InputStream is = new BufferedInputStream(new FileInputStream(file)); try { final byte[] buffer = new byte[1024]; for (int read = 0; (read = is.read(buffer)) != -1;) { messageDigest.update(buffer, 0, read); } } finally { IOUtils.closeQuietly(is); } return messageDigest.digest(); } </code></pre>

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