java HmacSHA256算法加密

 public static void main(String[] args) throws NoSuchAlgorithmException, InvalidKeyException, UnsupportedEncodingException {
        String secret="2131231@#42";
        String message="我加密一下";
        Mac sha256_HMAC = Mac.getInstance("HmacSHA256");
        SecretKeySpec secretKey = new SecretKeySpec(secret.getBytes("utf-8"), "HmacSHA256");
        sha256_HMAC.init(secretKey);
        byte[] hash = sha256_HMAC.doFinal(message.getBytes("utf-8"));
        String encodeStr = Base64.encodeBase64String(hash);
        String encodeStr16=byte2Hex(hash);
    }

/**
     * 将byte转为16进制
     *
     * @param bytes
     * @return
     */
    private static String byte2Hex(byte[] bytes) {
        StringBuffer stringBuffer = new StringBuffer();
        String temp = null;
        for (int i = 0; i < bytes.length; i++) {
            temp = Integer.toHexString(bytes[i] & 0xFF);
            if (temp.length() == 1) {
                //1得到一位的进行补0操作
                stringBuffer.append("0");
            }
            stringBuffer.append(temp);
        }
        return stringBuffer.toString();
    }

    // 遍历排序后的字典，将所有参数按"keyvalue"格式拼接在一起
    StringBuilder basestring = new StringBuilder();
    for (Map.Entry<String, String> param : entrys) {
        if(!StringUtils.isBlank(param.getValue())) {
            basestring.append(param.getKey());
            basestring.append(param.getValue());
        }
    }
    basestring.append(secret);
    logger.info("basestring is  = {}", basestring);
    // 使用SHA256对待签名串求签
    boolean returnFlag = SignatureUtils.valid(basestring.toString(), secret, userSign);
    if (! returnFlag ) {
        logger.info("user sign error==============sign={},  string={}", clientSign, basestring);
    }

//  项目需要对表的数据进行签名
package com.api.common.utils;
import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;
import javax.crypto.Mac;
import javax.crypto.spec.SecretKeySpec;
import java.nio.charset.StandardCharsets;
public abstract class SignatureUtils {
    private static Logger logger = LogManager.getLogger(SignatureUtils.class);
    private static final String ALGORITHM = "HmacSHA256";
    public static boolean valid(String message, String secret, String signature) {
        return signature != null && signature.equals(sign(message, secret));
    }
    public static String sign(String message, String secret) {
        try {
            Mac hmac = Mac.getInstance(ALGORITHM);
            SecretKeySpec secret_key = new SecretKeySpec(secret.getBytes(StandardCharsets.UTF_8), ALGORITHM);
            hmac.init(secret_key);
            byte[] bytes = hmac.doFinal(message.getBytes());
            logger.info("service sign is "+byteArrayToHexString(bytes));
            return byteArrayToHexString(bytes);
        } catch (Exception ex) {
            logger.error("签名错误：", ex);
        }
        return null;
    }
    private static String byteArrayToHexString(byte[] bytes) {
        StringBuilder hs = new StringBuilder();
        String tempStr;
        for (int index = 0; bytes != null && index < bytes.length; index++) {
            tempStr = Integer.toHexString(bytes[index] & 0XFF);
            if (tempStr.length() == 1)
                hs.append('0');
            hs.append(tempStr);
        }
        return hs.toString().toLowerCase();
    }
}