package cn.lili.common.utils;
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import java.util.UUID;
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import java.util.concurrent.ThreadLocalRandom;
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/**
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* 通用工具
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* @author Chopper
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*/
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public class CommonUtil {
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public static final String BASE_NUMBER = "0123456789";
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/**
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* 以UUID重命名
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* @param fileName 文件名称
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* @return 格式化名称
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*/
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public static String rename(String fileName) {
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String extName = fileName.substring(fileName.lastIndexOf("."));
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return UUID.randomUUID().toString().replace("-", "") + extName;
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}
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/**
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* 随机6位数生成
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*/
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public static String getRandomNum() {
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StringBuilder sb = new StringBuilder(6);
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for (int i = 0; i < 6; i++) {
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int num = ThreadLocalRandom.current().nextInt(BASE_NUMBER.length());
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sb.append(BASE_NUMBER.charAt(num));
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}
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return sb.toString();
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}
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/**
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* 获取特定字符 + 6位随机数
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* @return
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*/
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public static String getSpecialStr(String value) {
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return value + getRandomNum();
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}
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}
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