如何在 Java 中检查密码验证中的特殊字符？

Question

我正在尝试获取代码来检查是否输入了特殊字符，但是，当密码中未输入特殊字符时，我没有收到任何验证错误。是否有未识别特殊字符的原因？所有其他密码验证检查工作正常

//package sampleProject;
import java.util.*;
import java.util.Scanner;

public class Lab7 {

      public static void main(String []args){
         
             // Specify the maximum number of letters in a password
             final int MAX=10;
             int invalidCount = 0;                          
         
             // Specifying the number of uppercase letters in password
             final int MIN_Uppercase=1;
             // Specifying the minimum lowercase letters in password
             final int NUM_Digits=2;
             // Specify the minimum number of special case letters
             final int Special=1;
             // Count number of uppercase letters in a password
             int uppercaseCounter=0;
             // Count digits in a password
             int digitCounter=0;
             // count special case letters in a password
             int specialCounter=0;            
                    
 System.out.println("Enter the password\n");
            
 Scanner input = new Scanner(System.in);        
            
 String password = input.nextLine();
             
             for (int i=0; i < password.length(); i++ ) {
                    char c = password.charAt(i);
                    if(Character.isUpperCase(c)) 
                          uppercaseCounter++;
                    else if(Character.isDigit(c)) 
                          digitCounter++;     
                     if(c == '$' || c == '#' || c == '?' || c == '!' || c == '_' || c == '=' || c == '%'){
                      specialCounter++;
                 }                    
             }
             
             if (password.length() >= MAX && uppercaseCounter >= MIN_Uppercase && specialCounter == 1 && digitCounter == 2 || digitCounter == 3) { 
                    System.out.println("Valid Password");
             }
             else {
                    System.out.println("Your password does not contain the following:");                    
                    
                    if(password.length() < MAX)
                          System.out.println("Enter atleast 10 characters");
                    if (uppercaseCounter < MIN_Uppercase) 
                          System.out.println("Enter at least 1 uppercase character");
                    if(digitCounter != 2 || digitCounter != 3) 
                          System.out.println("Enter either 2 or 3 digits");
                    if(specialCounter > 1)
                          System.out.println("Password should contain only 1 special characters");                    
             }            
    }
}

Answer 1

当没有输入特殊字符时，您不会收到任何验证错误，因为这不是您的检查所做的：

if(specialCounter > 1)
    System.out.println("Password should contain only 1 special characters");

当有多个特殊字符（这没有意义）时，您将打印一条错误消息。我建议：

if(specialCounter < 1)
    System.out.println("Password should contain at least 1 special characters");

Answer 2

你应该在这一行中做什么：

if(specialCounter != 1)
    System.out.println("Password should contain only 1 special characters");

如果不等于0，则抛出异常。 != 表示不相等，所以如果它小于或大于 1，就会出错。

如何在 Java 中检查密码验证中的特殊字符？

How can I check for special characters in password validation in Java?

java

passwords

special-characters