MD5加密之提取文件的MD5特征码

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 1 public static String encodeFile(String path) { 2  3         try { 4             MessageDigest digester = MessageDigest.getInstance("MD5"); 5              6             FileInputStream in = new FileInputStream(path); 7              8             byte[] bytes = new byte[1024]; 9             int byteCount;10             while ((byteCount = in.read(bytes)) > 0) {11                 digester.update(bytes, 0, byteCount);12             }13             byte[] digest = digester.digest();14             15             //用StringBuffer拼接字节数组16             StringBuffer sb = new StringBuffer();17             for (byte b : digest) {18                 String str = Integer.toHexString(b & 0xff);19                 if(str.length() == 1){20                     str = "0" + str;21                 }22                 sb.append(str);23             }24             in.close();25             26             return sb.toString();27             28         } catch (Exception e) {29             e.printStackTrace();30         }31         return null;32     }

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