import java.security.MessageDigest;  
    import java.security.NoSuchAlgorithmException;  
      
    public class MD5 {  
      
        public static String getMD5(String content) {  
            try {  
                MessageDigest digest = MessageDigest.getInstance("MD5");  
                digest.update(content.getBytes());  
                return getHashString(digest);  
                  
            } catch (NoSuchAlgorithmException e) {  
                e.printStackTrace();  
            }  
            return null;  
        }  
          
        private static String getHashString(MessageDigest digest) {  
            StringBuilder builder = new StringBuilder();  
            for (byte b : digest.digest()) {  
                builder.append(Integer.toHexString((b >> 4) & 0xf));  
                builder.append(Integer.toHexString(b & 0xf));  
            }  
            return builder.toString();  
        }  
    }