@Setter
@Getter
@NoArgsConstructor
public class R<T> {
    public static final int CODE_SUCCESS = 200;
    public static final String MSG_SUCCESS = "操作成功";
    public static final int CODE_NOLOGIN = 401;
    public static final String MSG_NOLOGIN = "请先登陆";
    public static final int CODE_ERROR = 500;
    public static final int CODE_REGISTER_ERROR = 500;
    public static final String MSG_ERROR = "系统异常，请联系管理员";
    public static final int CODE_ERROR_PARAM = 501;

    private int code;
    private String msg;
    private T data;

    public R(int code, String msg, T data) {
        this.code = code;
        this.msg = msg;
        this.data = data;
    }

    public static <T> R<T> ok(T data) {
        return new R<>(CODE_SUCCESS, MSG_SUCCESS, data);
    }

    public static <T> R<T> ok() {
        return new R<>(CODE_SUCCESS, MSG_SUCCESS, null);
    }

    public static <T> R<T> error(int code, String msg, T data) {
        return new R<>(code, msg, data);
    }

    public static <T> R<T> error(int code, String msg) {
        return new R<>(code, msg, null);
    }

    public static <T> R<T> defaultError() {
        return new R<>(CODE_ERROR, MSG_ERROR, null);
    }

    public static <T> R<T> noLogin() {
        return new R<>(CODE_NOLOGIN, MSG_NOLOGIN, null);
    }

    public static <T> R<T> noPermission() {
        return new R<>(403, "非法访问", null);
    }
    public T checkAndGet() {
        if (this.code != CODE_SUCCESS) {
            throw new BizException(code, msg);
        }
        return data;
    }
}

/**
 * 自定义的业务异常
 */
@Getter
public class BizException extends RuntimeException {

    private Integer code = R.CODE_ERROR;

    public BizException() {
        super(R.MSG_ERROR);
    }

    public BizException(String message) {
        super(message);
    }

    public BizException(Integer code, String message) {
        super(message);
        this.code = code;
    }
}

/**
 * Md5工具类
 *
 */
public class Md5Utils {
    
    /**
     * @Description: 生成MD5
     * @param message
     * @return
     */
    public static String getMD5(String message) {
        String md5 = "";
        try {
            MessageDigest md = MessageDigest.getInstance("MD5"); // 创建一个md5算法对象
            byte[] messageByte = message.getBytes("UTF-8");
            byte[] md5Byte = md.digest(messageByte); // 获得MD5字节数组,16*8=128位
            md5 = bytesToHex(md5Byte); // 转换为16进制字符串
        } catch (Exception e) {
            e.printStackTrace();
        }
        return md5;
    }
    
    /**
     * @Description: 二进制转十六进制
     * @param bytes
     * @return
     */
    private static String bytesToHex(byte[] bytes) {
        StringBuffer hexStr = new StringBuffer();
        int num;
        for (int i = 0; i < bytes.length; i++) {
            num = bytes[i];
            if (num < 0) {
                num += 256;
            }
            if (num < 16) {
                hexStr.append("0");
            }
            hexStr.append(Integer.toHexString(num));
        }
        return hexStr.toString().toUpperCase();
    }
    
    /**
     * 
     * @Description: 签名：请求参数排序并后面补充key值，最后进行MD5加密，返回大写结果
     * @param params 参数内容
     * @return
     */
    public static String signatures(Map<String, Object> params){
        String signatures = "";
        try {
            List<String> paramsStr = new ArrayList<String>();
            for (String key1 : params.keySet()) {
                if(null != key1 && !"".equals(key1)){
                    paramsStr.add(key1);
                }
            }
            Collections.sort(paramsStr);
            StringBuilder sbff = new StringBuilder();
            for (String kk : paramsStr) {
                String value = params.get(kk).toString();
                if ("".equals(sbff.toString())) {
                    sbff.append(kk + "=" + value);
                } else {
                    sbff.append("&" + kk + "=" + value);
                }
            }
            //加上key值
            signatures = getMD5(sbff.toString()).toUpperCase();
        }catch(Exception e) {
            e.printStackTrace();
        }
        return signatures;
    }

    public static void main(String[] args) {
        String str = "12345618888888888";
        String pass = Md5Utils.getMD5(str);
        System.out.println(pass);
    }
}