随机验证码生成
1 package com.Stringuse;
2
3 import java.util.Random;
4 //使用StringBuilder的方发创建验证码
5 /*public class SuiJiMA {
6
7 public static void main(String[] args) {
8
9 StringBuilder stringBuilder = new StringBuilder();
10 Random random = new Random();
11 for(int i=0; i<4;i++){
12
13 int x = random.nextInt(10);
14 stringBuilder.append(x);
15 }
16 System.out.print("验证码："+stringBuilder);
17 }
18 }*/
19
20 // 使用空字符串
21 public class SuiJiMA {
22 public static void main(String[] args) {
23 String st = " ";
24 Random random = new Random();
25 for(int i=0;i<4;i++){
26 int x = random.nextInt(10);
27 st = st + x;
28 }
29 System.out.println("验证码："+st);
30 }
31 } 1 //生成随机字母验证码
2 public class SuiJiMA {
3 public static void main(String[] args) {
4 StringBuilder stringBuilder = new StringBuilder();
5 Random random = new Random();
6 for(int i=0;i<4;i++){
7 int t = random.nextInt(2);
8 char ch = t ==0? (char)(random.nextInt(26)+'a'):(char)(random.nextInt(26)+'A');
9 stringBuilder.append(ch);
10 }
11 System.out.println(stringBuilder);
12 }
13 }
转载于:https://www.cnblogs.com/fujilong/p/4689319.html
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