如何比較使用.equals（）方法的兩個密碼（創建密碼和確認密碼）？

Question

我正在構建一個簡單的創建帳戶用戶GUI，與我的LogInScreen類集成。它創建一個簡單的用戶，將其序列化，然後讓我在登錄程序中使用該訪問。問題是，當我輸入密碼時，他們從來都不正確。我的程序告訴我我的密碼不一樣，我總是遇到問題。我不知道如何解決這個問題，我想知道如何。我會在下面發佈我的代碼（整個事情，以及我的序列化類，因爲問題可能在這裏）。

用戶類別：

package passwordProgram; 

import java.util.ArrayList; 

import java.awt.BorderLayout; 
import java.awt.Color; 
import java.awt.GridBagConstraints; 
import java.awt.GridBagLayout; 
import java.awt.event.ActionEvent; 
import java.awt.event.ActionListener; 

import java.io.Serializable; 

import javax.swing.JButton; 
import javax.swing.JFrame; 
import javax.swing.JLabel; 
import javax.swing.JPanel; 
import javax.swing.JPasswordField; 
import javax.swing.JTextField; 
import javax.swing.UIManager; 

public class User implements Serializable, ActionListener { 

    public static ArrayList<String> allUsernames = new ArrayList<String>(); 

    String username; 
    String password; 

    public static void main(String[] args) { 
     try { 
      UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName()); 
     } catch (Exception e) { 
      e.printStackTrace(); 
     } 
     User user = new User(); 
     user.mainGUI(); 
    } 



    JFrame frame; 
    JPanel panel; 
    JTextField createUsername; 
    JPasswordField createPassword; 
    JPasswordField confirmPassword; 
    JButton createAccount; 
    JLabel noValid; 

    public void mainGUI() { 
     noValid = new JLabel(); 
     frame = new JFrame("Create a new account!"); 
     panel = new JPanel(); 
     panel.setBackground(Color.ORANGE); 
     createPassword = new JPasswordField(10); 
     confirmPassword = new JPasswordField(10); 
     createUsername = new JTextField(10); 
     JLabel userTxt = new JLabel("New Username: "); 
     JLabel userPass = new JLabel("New Password: "); 
     JLabel confirmPass = new JLabel("Confirm Password: "); 
     createAccount = new JButton("Create your account!"); 

     panel.setLayout(new GridBagLayout()); 
     GridBagConstraints left = new GridBagConstraints(); 
     left.anchor = GridBagConstraints.WEST; 
     GridBagConstraints right = new GridBagConstraints(); 
     right.anchor = GridBagConstraints.EAST; 
     right.weightx = 2.0; 
     right.fill = GridBagConstraints.HORIZONTAL; 
     right.gridwidth = GridBagConstraints.REMAINDER; 

     frame.getContentPane().add(BorderLayout.NORTH, noValid); 
     frame.getContentPane().add(BorderLayout.CENTER, panel); 
     panel.add(userTxt, left); 
     panel.add(createUsername, right); 
     panel.add(userPass, left); 
     panel.add(createPassword, right); 
     panel.add(confirmPass, left); 
     panel.add(confirmPassword, right); 

     frame.getContentPane().add(BorderLayout.SOUTH, createAccount); 
     frame.setVisible(true); 
     frame.setSize(500, 300); 

     createAccount.addActionListener(this); 
    } 

    public void actionPerformed(ActionEvent event) { 
     if (createUsername.getText().length() <= 0) { 
      noValid.setText("That is not a valid username. Please try again."); 
      frame.getContentPane().add(BorderLayout.NORTH, noValid); 
     } 

     else if (allUsernames.contains(createUsername.getText())) { 
      noValid.setText("That username is already taken. Please try again."); 
      frame.getContentPane().add(BorderLayout.NORTH, noValid); 
     } 

      //THIS IS THE PART I'M CONFUSED ABOUT 
     else if (!(createPassword.getPassword().equals(confirmPassword.getPassword()))) { 
      noValid.setText("Your passwords do not match!"); 
      frame.getContentPane().add(BorderLayout.NORTH, noValid); 
     } else {  
      SaveUser sUser = new SaveUser(); 
      sUser.createAccount(this); 
      noValid.setText("Account created successfully"); 
      frame.getContentPane().add(BorderLayout.NORTH, noValid); 
     } 
    } 
} 

而串行化類：

package passwordProgram; 

import java.io.FileOutputStream; 
import java.io.ObjectOutputStream; 

public class SaveUser { 
    public void createAccount(User u) { 
     try { 
      FileOutputStream fileOS = new FileOutputStream("userInfo.txt"); 
      ObjectOutputStream objectOS = new ObjectOutputStream(fileOS); 
      objectOS.writeObject(u); 
      objectOS.close(); 
     } catch (Exception e) { 
      e.printStackTrace(); 
     } 
    } 
} 

Answer 1

getPassword()回報char[]，不String。使用

!(Arrays.equals(createPassword.getPassword(), confirmPassword.getPassword())) 

代替

Answer 2

getPassword()返回char[]。因此，而不是嘗試：

if (!(new String(createPassword.getPassword()).equals(new String(confirmPassword.getPassword())) 

Answer 3

你比較char陣列Objects（由getPassword()返回），而不是比陣列本身的內容。比較這2個數組最安全的方法是使用Arrays#equals：

else if (!(Arrays.equals(createPassword.getPassword(), 
          confirmPassword.getPassword()))) { 

Answer 4

JPasswordField.getPassword()返回char[]。使用兩個char數組調用array1.equals(array2)（就像你正在做的那樣）將檢查它們是否是相同的對象引用，而不是如果它們具有相同的內容。你想用`Array.equals(char[] array1, char[] array2)，像這樣：

else if (!Array.equals(createPassword.getPassword(), confirmPassword.getPassword())) 

Answer 5

除非這是一個玩具項目，你不應該存儲密碼明文。相反，存儲密碼的散列;當用戶登錄時，散列密碼並將其與存儲的散列進行比較。 This question's accepted answer has some sample hashing code。