验证码设计 - 黑马程序员技术交流社区

忽略大小写

import java.util.*;
/*
* 制作一个6位的不同字符的验证码
* 输出到控制台，用户输入，判断对还是错
* 6位不同的，数字，字母，汉字
* 忽略大小写
*/
public class lianxi2 {
public static void main(String[] args) {
while(!yanzheng()){
System.out.println("亲，不要灰心！");
}
}
public static boolean yanzheng(){
Scanner in=new Scanner(System.in);
String[] ku=new String[]{"0","1","2","3","4","5","6","7","8","9","a","b","c","d","e","f","g","A","B","C","D","E","F","G"};
int i;
StringBuffer yanzheng=new StringBuffer();
while(yanzheng.length()<6){
//没有去重
i=new Random().nextInt(ku.length);
yanzheng.append(ku[i]);
}
String yz=yanzheng.substring(0);
System.out.println(yz);
System.out.println("请输入验证码：");
String shuru=in.nextLine();
//忽略大小写
if (yz.equalsIgnoreCase(shuru)) {
System.out.println("验证通过！");
return true;
}else{
System.out.println("验证失败，请重新验证。");
return false;
}
}
}

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对于字符库里的1 2 3字符只能定义在数组里吗，那要是汉字的验证码，不是要把所有的汉字都放到数组里了。

package cn.itcast.collection;
import java.util.Random;
import java.util.Scanner;
public class Test2 {
/**
* 制作一个6位的不同字符的验证码
输出到控制台，用户输入，判断对还是错
6位不同的，数字，字母，汉字
*/
public static void main(String[] args) {
char[] ch = {'1','2','3','4','5','6','7','8','9','a','b','c','d','e','f','g','h','i','j','j','k','l','m','n','o','p','q','r','s','t','u','v','w','x','y','z'};
Random ra = new Random();
Scanner sc = new Scanner(System.in);
int x =ra.nextInt(ch.length+1);
StringBuffer sb = new StringBuffer();
for (int i = x; sb.length() < 6 ; ) {
String s = String.valueOf(ch[x]);
if(!sb.toString().contains(s))
sb.append(ch[x]);
x =ra.nextInt(ch.length+1);
}
System.out.println(sb);
System.out.println("请输入验证码:");
String in = sc.nextLine();
if(in.equals(sb.toString()))
System.out.println("验证码输入正确！");
else
System.out.println("验证码输入错误！");
}
}

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