Java 随机数生成工具RandomUtils
RandomUtils
/** * <html> * <body> * <P> Copyright 1994 JsonInternational</p> * <p> All rights reserved.</p> * <p> Created on 19941115</p> * <p> Created by Jason</p> * </body> * </html> */ package cn.ucaner.alpaca.framework.utils.math; import java.util.Random; /** * @Package:cn.ucaner.common.utils.math * @ClassName:RandomUtils * @Description: <p> 随机数工具类</p> * @Author: - Jason * @CreatTime:2017年10月26日 上午10:50:29 * @Modify By: * @ModifyTime: * @Modify marker: * @version V1.0 */ public class RandomUtils { private static final String ALL_CHAR = "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"; private static final String LETTER_CHAR = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"; private static final String NUMBER_CHAR = "0123456789"; /** * 获取定长的随机数,包含大小写、数字 * @param length 随机数长度 * @return */ public static String generateString(int length) { StringBuffer sb = new StringBuffer(); Random random = new Random(); for (int i = 0; i < length; i++) { sb.append(ALL_CHAR.charAt(random.nextInt(ALL_CHAR.length()))); } return sb.toString(); } /** * 获取定长的随机数,包含大小写字母 * @param length 随机数长度 * @return */ public static String generateMixString(int length) { StringBuffer sb = new StringBuffer(); Random random = new Random(); for (int i = 0; i < length; i++) { sb.append(LETTER_CHAR.charAt(random.nextInt(LETTER_CHAR.length()))); } return sb.toString(); } /** * 获取定长的随机数,只包含小写字母 * @param length 随机数长度 * @return */ public static String generateLowerString(int length) { return generateMixString(length).toLowerCase(); } /** * 获取定长的随机数,只包含大写字母 * @param length 随机数长度 * @return */ public static String generateUpperString(int length) { return generateMixString(length).toUpperCase(); } /** * 获取定长的随机数,只包含数字 * @param length 随机数长度 * @return */ public static String generateNumberString(int length){ StringBuffer sb = new StringBuffer(); Random random = new Random(); for (int i = 0; i < length; i++) { sb.append(NUMBER_CHAR.charAt(random.nextInt(NUMBER_CHAR.length()))); } return sb.toString(); } /** * For Test by Jason */ public static void main(String[] args) { System.out.println("***********Test******************"); System.out.println("大小写数字:"+generateString(10)); System.out.println("大小写字母:"+generateMixString(10)); System.out.println("小写字母:"+generateLowerString(10)); System.out.println("大写字母:"+generateUpperString(10)); System.out.println("纯数字:"+generateNumberString(10)); System.out.println("***********Test******************"); } } //Outputs //***********Test****************** //大小写数字:SsvQTjEbMW //大小写字母:nJaVyqdmAP //小写字母:ppljietimr //大写字母:YDAGERAFCR //纯数字:8986305301 //***********Test******************
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