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!180 使用ThreadLocalRandom单例对象获取随机数，减少对象反复创建的开销，同时减少线程争用

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Merge pull request !180 from h0ss/dev
This commit is contained in:
孔明
2022-09-19 06:49:21 +00:00
committed by Gitee
parent 286f8700ef 5342bd5586
commit 7a7cd8b9e4
1 changed files with 7 additions and 4 deletions
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11
sa-token-core/src/main/java/cn/dev33/satoken/util/SaFoxUtil.java
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@@ -10,7 +10,7 @@ import java.util.Collections;
import java.util.Date;
import java.util.Iterator;
import java.util.List;
import java.util.Random;
import java.util.concurrent.ThreadLocalRandom;
import java.util.regex.Pattern;
import cn.dev33.satoken.exception.SaTokenException;
@@ -22,6 +22,10 @@ import cn.dev33.satoken.exception.SaTokenException;
*
*/
public class SaFoxUtil {
/**
* 可以减少线程争用的随机对象
*/
private static final ThreadLocalRandom RANDOM = ThreadLocalRandom.current();
private SaFoxUtil() {
}
@@ -52,10 +56,9 @@ public class SaFoxUtil {
*/
public static String getRandomString(int length) {
String str = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789";
Random random = new Random();
StringBuffer sb = new StringBuffer();
for (int i = 0; i < length; i++) {
int number = random.nextInt(62);
int number = RANDOM.nextInt(62);
sb.append(str.charAt(number));
}
return sb.toString();
@@ -95,7 +98,7 @@ public class SaFoxUtil {
* @return 随机字符串
*/
public static String getMarking28() {
return System.currentTimeMillis() + "" + new Random().nextInt(Integer.MAX_VALUE);
return System.currentTimeMillis() + "" + RANDOM.nextInt(Integer.MAX_VALUE);
}
/**