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URLHasher - Get MD5/SHA1/other MessageDigest hash of a URL's contents
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| package urlhasher; | |
| import java.io.IOException; | |
| import java.io.InputStream; | |
| import java.math.BigInteger; | |
| import java.net.URL; | |
| import java.security.MessageDigest; | |
| import java.security.NoSuchAlgorithmException; | |
| public class URLHasher { | |
| private URL url; | |
| private MessageDigest hash; | |
| public URLHasher(URL url) throws AlgorithmNotFoundException { | |
| this(url, "MD5"); | |
| } | |
| public URLHasher(URL url, String algorithm) throws AlgorithmNotFoundException { | |
| this.url = url; | |
| try { | |
| hash = MessageDigest.getInstance(algorithm); | |
| } catch(NoSuchAlgorithmException nsae) { | |
| throw new AlgorithmNotFoundException(); | |
| } | |
| } | |
| private InputStream getStream() throws IOException { | |
| return url.openStream(); | |
| } | |
| public String getHash() throws IOException { | |
| InputStream inputStream = getStream(); | |
| int read; | |
| byte[] dataTmp = new byte[4096]; | |
| while((read = inputStream.read(dataTmp)) != -1) | |
| hash.update(dataTmp, 0, read); | |
| byte[] hashDigest = hash.digest(); | |
| hash.reset(); | |
| return bytesToHex(hashDigest); | |
| } | |
| public static String bytesToHex(byte[] bytes) { | |
| BigInteger bigInt = new BigInteger(1, bytes); | |
| return String.format("%0" + (bytes.length << 1) + "x", bigInt); | |
| } | |
| class AlgorithmNotFoundException extends NoSuchAlgorithmException {}; | |
| } |
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