字符串随机生成工具类

package com.gblfy.util; import org.springframework.stereotype.Component; import java.util.ArrayList; import java.util.Arrays; import java.util.Random; /** * 字符随机生成类 */ @Component public class RandomStrUtil { /** * 随机产生类型枚举 */ public static enum TYPE { /** * 小字符型 */ LETTER, /** * 大写字符型 */ CAPITAL, /** * 数字型 */ NUMBER, /** * 大+小字符 型 */ LETTER_CAPITAL, /** * 小字符+数字 型 */ LETTER_NUMBER, /** * 大写字符+数字 */ CAPITAL_NUMBER, /** * 大+小字符+数字 型 */ LETTER_CAPITAL_NUMBER, } private static String[] lowercase = {"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"}; private static String[] capital = {"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"}; private static String[] number = {"1", "2", "3", "4", "5", "6", "7", "8", "9", "0"}; /** * 静态随机数 */ private static Random random = new Random(); /** * 获取随机组合码 * * @param num 位数 * @param type 类型 * @type <br>小写字符型 LETTER, * <br>大写字符型 CAPITAL, * <br>数字型 NUMBER, * <br>大+小字符型 LETTER_CAPITAL, * <br>小字符+数字 型 LETTER_NUMBER, * <br>大字符+数字 型 CAPITAL_NUMBER, * <br>大+小字符+数字 型 LETTER_CAPITAL_NUMBER, */ public static String getRandom(int num, TYPE type) { ArrayList<String> temp = new ArrayList<String>(); StringBuffer code = new StringBuffer(); switch (type) { case LETTER: temp.addAll(Arrays.asList(lowercase)); break; case CAPITAL: temp.addAll(Arrays.asList(capital)); break; case NUMBER: temp.addAll(Arrays.asList(number)); break; case LETTER_CAPITAL: temp.addAll(Arrays.asList(lowercase)); temp.addAll(Arrays.asList(capital)); break; case LETTER_NUMBER: temp.addAll(Arrays.asList(lowercase)); temp.addAll(Arrays.asList(number)); break; case CAPITAL_NUMBER: temp.addAll(Arrays.asList(capital)); temp.addAll(Arrays.asList(number)); break; case LETTER_CAPITAL_NUMBER: temp.addAll(Arrays.asList(lowercase)); temp.addAll(Arrays.asList(capital)); temp.addAll(Arrays.asList(number)); break; } for (int i = 0; i < num; i++) { code.append(temp.get(random.nextInt(temp.size()))); } return code.toString(); } //测试 public static void main(String[] args) { System.out.println(RandomStrUtil.getRandom(64, RandomStrUtil.TYPE.LETTER_CAPITAL)); } }