forked from plusone/plusone-commons
34 lines
1.2 KiB
Java
34 lines
1.2 KiB
Java
package xyz.zhouxy.plusone.commons.util;
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import java.util.Random;
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import java.util.concurrent.ThreadLocalRandom;
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public final class RandomTools {
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private RandomTools() {
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throw new IllegalStateException("Utility class");
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}
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public static String randomStr(char[] sourceCharacters, int length) {
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return randomStr(ThreadLocalRandom.current(), sourceCharacters, length);
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}
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/**
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* 使用传入的随机数生成器，生成指定长度的字符串
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*
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* @param random 随机数生成器。根据需要可以传入
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* {@link java.util.concurrent.ThreadLocalRandom}、{@link java.security.SecureRandom}
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* 等，不为空
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* @param sourceCharacters 字符池。字符串的字符将在数组中选，不为空
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* @param length 字符串长度
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* @return 随机字符串
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*/
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public static String randomStr(Random random, char[] sourceCharacters, int length) {
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char[] result = new char[length];
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for (int i = 0; i < length; i++) {
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result[i] = sourceCharacters[random.nextInt(sourceCharacters.length)];
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}
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return String.valueOf(result);
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}
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}
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