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!142 优化CommonUtil.getRandomNum() 提升随机数性能。 from @原批王

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Merge pull request !142 from 原批王/master
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chopper711 2022-03-29 09:02:36 +00:00 committed by Gitee
commit 07ce947f78
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1 changed files with 9 additions and 7 deletions
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16
framework/src/main/java/cn/lili/common/utils/CommonUtil.java
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@ -1,7 +1,7 @@
package cn.lili.common.utils;
import java.util.Random;
import java.util.UUID;
import java.util.concurrent.ThreadLocalRandom;
/**
* 通用工具
@ -9,6 +9,8 @@ import java.util.UUID;
*/
public class CommonUtil {
public static final String BASE_NUMBER = "0123456789";
/**
* 以UUID重命名
* @param fileName 文件名称
@ -24,12 +26,12 @@ public class CommonUtil {
* 随机6位数生成
*/
public static String getRandomNum() {
Random random = new Random();
int num = random.nextInt(999999);
//不足六位前面补0
String str = String.format("%06d", num);
return str;
StringBuilder sb = new StringBuilder(6);
for (int i = 0; i < 6; i++) {
int num = ThreadLocalRandom.current().nextInt(BASE_NUMBER.length());
sb.append(BASE_NUMBER.charAt(num));
}
return sb.toString();
}
}