随机码(验证码、短信码)生成工具类
需求
工作中有时需要使用验证码(随机码)进行业务处理的情形,因此特意收集了开发中使用的工具,已被不时之需。
工具类代码如下:
package com.cloud.util;
import java.util.ArrayList;
import java.util.List;
import java.util.Random;
import java.util.logging.Logger;
/**
* @author raos
* @emil [email protected]
* @date 2020/12/25
* 随机码/预约码/短信码生成工具类
*/
public class MateUtils {
private static final Logger log = Logger.getLogger("MateUtils.class");
/** 预约码码表 */
private static final char[] CODE_TABLE= {
'A','B','C','D','E','F','G','H','I','J','K','L','M','N','O','P','Q','R',
'S','T','U','V','W','X','Y','Z','0','1','2','3','4','5','6','7','8','9'};
/** 随机码默认位数-- 6位 */
private static final int DEFAULT_DIGIT = 6;
/** 默认随机码个数-- 2个 */
private static final int DEFAULT_NUMBER = 2;
private MateUtils() {
}
/** 默认生成单个6位预约码 */
public static String generateOne() {
StringBuilder strBuild = new StringBuilder();
for (int i = 0; i <= DEFAULT_DIGIT; i++) {
strBuild.append(CODE_TABLE[new Random().nextInt(36)]);
}
return strBuild.toString();
}
/**
* 指定位数生成随机码,位数需大于0,否则返回默认6位随机码
* @param digit 随机码的位数
*/
public static String generateOne(int digit) {
if (digit > 0) {
StringBuilder strBuild = new StringBuilder();
for (int i = 0; i <= digit; i++) {
strBuild.append(CODE_TABLE[new Random().nextInt(36)]);
}
return strBuild.toString();
}
return generateOne();
}
/**
* 默认生成 2个 6位随机码
*/
public static List<String> generateList() {
List<String> randomCodes = new ArrayList<>(DEFAULT_NUMBER);
for (int i = 0; i < DEFAULT_NUMBER; i++) {
randomCodes.add(generateOne());
}
return randomCodes;
}
/**
* 指定生成随机码个数、位数生成随机码,位数需大于0,否则返回默认6位随机码,个数需大于1,否则默认2个
* @param number 随机码生成个数
* @param digit 随机码位数
*/
public static List<String> generateList(int number, int digit) {
if (number > 1) {
List<String> randomCodes = new ArrayList<>(number);
for (int i = 0; i < number; i++) {
randomCodes.add(generateOne(digit));
}
return randomCodes;
}
return generateList();
}
/**
* 测试入口
*/
public static void main(String[] args) {
log.info("循环开始" + System.currentTimeMillis());
for (int i = 0; i < 100; i++) {
System.out.println(generateOne());
}
log.info("循环结束" + System.currentTimeMillis());
}
}