yichael_gamecenter-springboot/src/main/java/com/bbeng/www/GameCenter/GCommonUtils.java

package com.bbeng.www.GameCenter;

import org.apache.commons.codec.binary.Hex;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.springframework.util.StringUtils;

import javax.crypto.Mac;
import javax.crypto.SecretKey;
import javax.crypto.spec.SecretKeySpec;
import java.io.UnsupportedEncodingException;
import java.security.InvalidKeyException;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.util.UUID;

/**
 * 综合工具类
 *
 * @author 卜长清，buchangqing@goluk.com
 * @version 1.0.0
 * @date 2015年9月16日 下午4:13:05
 */
public class GCommonUtils {
    private static Log LOG = LogFactory.getLog(GCommonUtils.class);

    // ================================================================================
    // UUID
    // ================================================================================
    private static String[] chars = new String[]{"a", "b", "c", "d", "e", "f",
            "g", "h", "i", "j", "k", "l", "m", "n", "o", "p", "q", "r", "s",
            "t", "u", "v", "w", "x", "y", "z", "0", "1", "2", "3", "4", "5",
            "6", "7", "8", "9", "A", "B", "C", "D", "E", "F", "G", "H", "I",
            "J", "K", "L", "M", "N", "O", "P", "Q", "R", "S", "T", "U", "V",
            "W", "X", "Y", "Z"};

    /**
     * 8 digital short UUID
     *
     * @return
     */
    public static String shortUuid() {
        String uuid = GCommonUtils.uuid();

        StringBuffer shortBuffer = new StringBuffer();
        for (int i = 0; i < 8; i++) {
            String str = uuid.substring(i * 4, i * 4 + 4);
            int x = Integer.parseInt(str, 16);
            shortBuffer.append(chars[x % 0x3E]);
        }

        return shortBuffer.toString();
    }

    /**
     * 32 digital normal UUID
     *
     * @return
     */
    public static String uuid() {
        return UUID.randomUUID().toString().replace("-", "");
    }

    /**
     * 获取动态长度的 UUID
     */
    public static String dynamicUuid(int size) {
        String uuid = "";
        for (int i = 0; i < size / 8; i++) {
            uuid += shortUuid();
        }

        int remain = size % 8;
        if (remain > 0) {
            uuid += shortUuid().substring(0, remain);
        }

        return uuid;
    }

    public static String dynamicUuid(int size, String prefix) {
        return String.format("%s%s", prefix, dynamicUuid(size));
    }

    // ================================================================================
    // HASH
    // ================================================================================

    /**
     * HMAC签名
     *
     * @param key  键
     * @param data 数据
     * @return 签名
     */
    public static String getHmacSHA256(String key, String data) {
        String sign = "";

        try {
            if (StringUtils.isEmpty(key) || StringUtils.isEmpty(data)) {
                sign = "Missing argument";
                return sign;
            }

            Mac mac = Mac.getInstance("HMACSHA256");
            byte[] secretByte = key.getBytes("UTF-8");
            byte[] dataBytes = data.getBytes("UTF-8");
            SecretKey secret = new SecretKeySpec(secretByte, "HMACSHA256");

            mac.init(secret);
            byte[] doFinal = mac.doFinal(dataBytes);
            byte[] hex = new Hex().encode(doFinal);
            sign = new String(hex);
        } catch (NoSuchAlgorithmException e) {
            e.printStackTrace();
        } catch (UnsupportedEncodingException e) {
            e.printStackTrace();
        } catch (InvalidKeyException e) {
            e.printStackTrace();
        } catch (Exception e) {
            e.printStackTrace();
        }

        return sign;
    }

    /**
     * 获取数据数字Hash
     *
     * @param data
     * @param algorithm following algorithms:
     *                  - MD5
     *                  - SHA-1
     *                  - SHA-224
     *                  - SHA-256
     *                  - SHA-384
     *                  - SHA-512
     * @return
     */
    public static String getHash(String data, String algorithm) {
        String hash = "";

        if (StringUtils.isEmpty(data)) {
            return hash;
        }

        try {
            MessageDigest messageDigest = MessageDigest.getInstance(algorithm);
            messageDigest.update(data.getBytes());

            byte bytes[] = messageDigest.digest();
            StringBuffer hexString = new StringBuffer();
            for (int i = 0; i < bytes.length; i++) {
                String hex = Integer.toHexString(0xff & bytes[i]);
                if (hex.length() == 1) {
                    hexString.append('0');
                }
                hexString.append(hex);
            }

            hash = hexString.toString();
        } catch (NoSuchAlgorithmException e) {
            e.printStackTrace();
        }

        return hash.toLowerCase();
    }
}