随机数工具类

随机数工具类

 

  1 /**
  2  * <html>
  3  * <body>
  4  *  <P> Copyright 1994 JsonInternational</p>
  5  *  <p> All rights reserved.</p>
  6  *  <p> Created on 19941115</p>
  7  *  <p> Created by Jason</p>
  8  *  </body>
  9  * </html>
 10  */
 11 package cn.ucaner.alpaca.framework.utils.math;
 12 
 13 import java.util.Random;
 14 
 15 /**
 16 * @Package:cn.ucaner.common.utils.math   
 17 * @ClassName:RandomUtils   
 18 * @Description:   <p> 随机数工具类</p>
 19 * @Author: - Jason 
 20 * @CreatTime:2017年10月26日 上午10:50:29   
 21 * @Modify By:   
 22 * @ModifyTime:  
 23 * @Modify marker:   
 24 * @version    V1.0
 25  */
 26 public class RandomUtils {
 27     
 28     private static final String ALL_CHAR = "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"; 
 29     private static final String LETTER_CHAR = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"; 
 30     private static final String NUMBER_CHAR = "0123456789";
 31     
 32     /**
 33      * 获取定长的随机数,包含大小写、数字
 34      * @param length 随机数长度
 35      * @return
 36      */
 37     public static String generateString(int length) { 
 38         StringBuffer sb = new StringBuffer(); 
 39         Random random = new Random(); 
 40         for (int i = 0; i < length; i++) { 
 41                 sb.append(ALL_CHAR.charAt(random.nextInt(ALL_CHAR.length()))); 
 42         } 
 43         return sb.toString(); 
 44     } 
 45     
 46     /**
 47      * 获取定长的随机数,包含大小写字母
 48      * @param length 随机数长度
 49      * @return
 50      */
 51     public static String generateMixString(int length) { 
 52         StringBuffer sb = new StringBuffer(); 
 53         Random random = new Random(); 
 54         for (int i = 0; i < length; i++) { 
 55                 sb.append(LETTER_CHAR.charAt(random.nextInt(LETTER_CHAR.length()))); 
 56         } 
 57         return sb.toString(); 
 58     } 
 59     
 60     /**
 61      * 获取定长的随机数,只包含小写字母
 62      * @param length 随机数长度
 63      * @return
 64      */
 65     public static String generateLowerString(int length) { 
 66         return generateMixString(length).toLowerCase(); 
 67     } 
 68     
 69     /**
 70      * 获取定长的随机数,只包含大写字母
 71      * @param length 随机数长度
 72      * @return
 73      */
 74     public static String generateUpperString(int length) { 
 75         return generateMixString(length).toUpperCase(); 
 76     } 
 77     
 78     /**
 79      * 获取定长的随机数,只包含数字
 80      * @param length 随机数长度
 81      * @return
 82      */
 83     public static String generateNumberString(int length){
 84         StringBuffer sb = new StringBuffer(); 
 85         Random random = new Random(); 
 86         for (int i = 0; i < length; i++) { 
 87                 sb.append(NUMBER_CHAR.charAt(random.nextInt(NUMBER_CHAR.length()))); 
 88         } 
 89         return sb.toString(); 
 90     }
 91     
 92     /**
 93      * For Test by Jason
 94      */
 95     public static void main(String[] args) {
 96         System.out.println("***********Test******************");
 97         System.out.println("大小写数字:"+generateString(10));
 98         System.out.println("大小写字母:"+generateMixString(10));
 99         System.out.println("小写字母:"+generateLowerString(10));
100         System.out.println("大写字母:"+generateUpperString(10));
101         System.out.println("纯数字:"+generateNumberString(10));
102         System.out.println("***********Test******************");
103     }
104     
105 }
106 //Outputs
107 //***********Test******************
108 //大小写数字:SsvQTjEbMW
109 //大小写字母:nJaVyqdmAP
110 //小写字母:ppljietimr
111 //大写字母:YDAGERAFCR
112 //纯数字:8986305301
113 //***********Test******************

 

posted @ 2018-06-14 20:22  安以北往南  阅读(223)  评论(0编辑  收藏  举报