用Java生成密码
现在，如今几乎每个网站都要求生成临时密码。如果用户忘记了密码，系统会根据公司的密码策略生成随机密码。以下示例生成遵循以下条件的随机密码-
它应至少包含一个大写字母。
它应至少包含一个小写字母。
它应至少包含一个数字。
长度应为8个字符。
它应包含以下特殊字符之一：@，$，#，！。
示例
import java.util.Random;
public class Tester{
public static void main(String[] args) {
System.out.println(generatePassword(8));
}
private static char[] generatePassword(int length) {
String capitalCaseLetters = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
String lowerCaseLetters = "abcdefghijklmnopqrstuvwxyz";
String specialCharacters = "!@#$";
String numbers = "1234567890";
String combinedChars = capitalCaseLetters + lowerCaseLetters + specialCharacters + numbers;
Random random = new Random();
char[] password = new char[length];
password[0] = lowerCaseLetters.charAt(random.nextInt(lowerCaseLetters.length()));
password[1] = capitalCaseLetters.charAt(random.nextInt(capitalCaseLetters.length()));
password[2] = specialCharacters.charAt(random.nextInt(specialCharacters.length()));
password[3] = numbers.charAt(random.nextInt(numbers.length()));
for(int i = 4; i< length ; i++) {
password[i] = combinedChars.charAt(random.nextInt(combinedChars.length()));
}
return password;
}
}输出结果
cF#0KYbY