[Java] Jackson Json <-> Object & hash MD5

    public String hash() {
        try {
            String json = new ObjectMapper().writeValueAsString(this);
            return CryptUtils.md5(json);

        } catch (JsonProcessingException e) {
            e.printStackTrace();
        }

        return "";
    }
    
    
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;

public class CryptUtils {
    private static final Logger LOGGER = LoggerFactory.getLogger(CryptUtils.class);

    public static String md5(String message) {
        if (message == null) {
            return null;
        }

        StringBuffer encrypted = new StringBuffer();

        try {
            MessageDigest md = MessageDigest.getInstance("MD5");

            byte[] bytData = message.getBytes();
            md.update(bytData);
            byte[] digest = md.digest();
            for (int i = 0; i < digest.length; i++) {
                encrypted.append(Integer.toString((digest[i] & 0xf0) >> 4, 16));
                encrypted.append(Integer.toString(digest[i] & 0x0f, 16));
            }
        } catch (NoSuchAlgorithmException e) {
            LOGGER.error(e.getMessage(), e);
        }

        return encrypted.toString();
    }
}

https://ramees.tistory.com/33

[Java] Jackson으로 Json <-> Object 변환(Transformation)하기