生成订单号、编码工具类随笔

/**
 *生成订单号、编码工具类
 */
@Component("GenerateNum")
public class GenerateNum {
    // 使用单例模式，不允许直接创建实例
    private GenerateNum() {
    }

    // 创建一个空实例对象，类需要用的时候才赋值
    private static GenerateNum g = null;

    // 单例模式--懒汉模式
    public static synchronized GenerateNum getInstance() {
        if (g == null) {
            g = new GenerateNum();
        }
        return g;
    }

    // 全局自增数
    private static int count = 0;

    // 每毫秒秒最多生成多少订单（最好是像9999这种准备进位的值）
    private static final int total = 9999;

    // 格式化的时间字符串
    private static final SimpleDateFormat sdf = new SimpleDateFormat("yyyyMMdd");

    // 获取当前时间年月日时分秒毫秒字符串
    private static String getNowDateStr() {
        return sdf.format(new Date());
    }

    // 记录上一次的时间，用来判断是否需要递增全局数
    private static String now = null;

    /**
     * 设置起始值
     *
     * @param num
     */
    public synchronized void reset(Integer num) {
        count = num;
        now = getNowDateStr();

    }

    /**
     * 生成一个订单号
     */
    public synchronized String GenerateOrder() {
        String datastr = getNowDateStr();
        if (datastr.equals(now)) {
            count++;// 自增
        } else {
            count = 1;
            now = datastr;
        }
        int countInteger = String.valueOf(total).length() - String.valueOf(count).length();// 算补位
        String bu = "";// 补字符串
        for (int i = 0; i < countInteger; i++) {
            bu += "0";
        }
        bu += String.valueOf(count);
        if (count >= total) {
            count = 0;
        }
        return datastr + bu;
    }


    /**
     * 将电话加星号处理
     */
    public static String phoneMask(String phone) {
        String res = "";
        if (!StringUtils.isEmpty(phone)) {
            StringBuilder stringBuilder = new StringBuilder(phone);
            res = stringBuilder.replace(0, Math.abs(phone.length() - 5), "******").toString();
        }
        return res;
    }


    /**
     * 将电话加星号处理
     */
    public static String nameMask(String name) {
        String res = "";
        String Str = "";

        if (!StringUtils.isEmpty(name)) {
            StringBuilder stringBuilder = new StringBuilder(name);
            int num = Math.abs(name.length() - 1);//显示1位
            for (int i = 0; i < num; i++) {
                Str += "*";
            }
            res = stringBuilder.replace(0, num, Str).toString();
        }
        return res;
    }


    /**
     * 将字符串前面加星号
     */
    public static String starMask(String name, int num) {
        String res = "";
        String Str = "";

        if (!StringUtils.isEmpty(name)) {
            StringBuilder stringBuilder = new StringBuilder(name);

            for (int i = 0; i < num; i++) {
                Str += "*";
            }
            res = stringBuilder.replace(0, num, Str).toString();
        }
        return res;
    }

    /**
     * 将字符串后面加星号
     */
    public static String endMask(String name, int num) {
        String res = "";
        String Str = "";

        if (!StringUtils.isEmpty(name)) {
            StringBuilder stringBuilder = new StringBuilder(name);

            for (int i = 0; i < num + 1; i++) {
                Str += "*";
            }
            res = stringBuilder.replace(num, name.length(), Str).toString();
        }
        return res;
    }


}