MD5

public class MDUtils {
    public static String md5(String content) {
        byte[] hash;
        try {
            hash = MessageDigest.getInstance("MD5").digest(content.getBytes("UTF-8"));
        } catch (NoSuchAlgorithmException e) {
            throw new RuntimeException("NoSuchAlgorithmException",e);
        } catch (UnsupportedEncodingException e) {
            throw new RuntimeException("UnsupportedEncodingException", e);
        }

        StringBuilder hex = new StringBuilder(hash.length * 2);
        for (byte b : hash) {
            if ((b & 0xFF) < 0x10){
                hex.append("0");
            }
            hex.append(Integer.toHexString(b & 0xFF));
        }
        return hex.toString();
    }
}