Java jFrame登录屏幕，在netbeans中读取2个文本文件

所以我开始为我的PAT 12年级任务创建这个项目，我遇到了一个减速带。。。 我在netbeans中有一个使用jFrame的登录屏幕。 我的问题是，我使用2个文本文件来存储数据：1个用于用户名，1个用于密码。它们使用扫描仪读取，并用#分隔。 关键是，我使用while循环验证用户名，但无法验证与另一个文本文件中的用户名对应的密码

因此，您可以想象两个文本文件：

• 用户名
• 密码

单击“登录”按钮时，它使用while循环检查用户名是否已存在。如果存在，请继续输入密码，否则“用户名不存在”。当匹配另一个文本文件中相同位置的密码时会出现问题

如果有人能帮助我，这将使我的星期和保存我的项目。 请理解，Netbeans只允许您编辑某些代码区域。我尽我最大的努力保持我的代码干净易懂

非常感谢,， 白雪公主

package Battlefield4;
import javax.swing.*;
import java.util.*;
import java.io.*;
import java.util.logging.Level;
import java.util.logging.Logger;

public class Login extends javax.swing.JFrame
{

String Username;
String Password;

public Login()
{
    initComponents();
}
             //Can not edit from here on      
private void initComponents() {

    txtUsername = new javax.swing.JTextField();
    txtPassword = new javax.swing.JTextField();
    lblPassword = new javax.swing.JLabel();
    lblUsername = new javax.swing.JLabel();
    btnLogin = new javax.swing.JButton();
    btnCreate = new javax.swing.JButton();
    jLabel1 = new javax.swing.JLabel();

    setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
    setSize(new java.awt.Dimension(854, 480));
    getContentPane().setLayout(new org.netbeans.lib.awtextra.AbsoluteLayout());
    getContentPane().add(txtUsername, new org.netbeans.lib.awtextra.AbsoluteConstraints(320, 150, 210, -1));
    getContentPane().add(txtPassword, new org.netbeans.lib.awtextra.AbsoluteConstraints(320, 220, 210, -1));

    lblPassword.setText("Password");
    getContentPane().add(lblPassword, new org.netbeans.lib.awtextra.AbsoluteConstraints(320, 200, -1, -1));

    lblUsername.setText("Username");
    getContentPane().add(lblUsername, new org.netbeans.lib.awtextra.AbsoluteConstraints(320, 130, -1, -1));

    btnLogin.setText("Login");
    btnLogin.addActionListener(new java.awt.event.ActionListener() {
        public void actionPerformed(java.awt.event.ActionEvent evt) {
            btnLoginActionPerformed(evt);
        }
    });
    getContentPane().add(btnLogin, new org.netbeans.lib.awtextra.AbsoluteConstraints(320, 290, -1, -1));

    btnCreate.setText("Create");
    btnCreate.addActionListener(new java.awt.event.ActionListener() {
        public void actionPerformed(java.awt.event.ActionEvent evt) {
            btnCreateActionPerformed(evt);
        }
    });
    getContentPane().add(btnCreate, new org.netbeans.lib.awtextra.AbsoluteConstraints(460, 290, -1, -1));

    jLabel1.setIcon(new javax.swing.ImageIcon(getClass().getResource("/Battlefield4/Batfield/Background/Login (Small).jpg"))); // NOI18N
    jLabel1.setText("jLabel1");
    getContentPane().add(jLabel1, new org.netbeans.lib.awtextra.AbsoluteConstraints(0, 0, 860, 480));

    pack();
}                        
//Can not edit before this
private void btnLoginActionPerformed(java.awt.event.ActionEvent evt) {                                         
    //This is from where Netbeans lets you edit your code.
    try {
        File user = new File("C:\\Users\\John1012\\Documents\\NetBeansProjects\\PATProject\\src\\Battlefield4\\Batfield\\Users\\Username.txt"); //To create a universal file for Input & Output
        File pass = new File("C:\\Users\\John1012\\Documents\\NetBeansProjects\\PATProject\\src\\Battlefield4\\Batfield\\Users\\Password.txt"); //To create a universal file for Input & Output
        user.getParentFile().mkdirs(); //To denote the parent file
        pass.getParentFile().mkdirs(); //To denote the parent file
        Scanner scUser = new Scanner(user).useDelimiter("#"); //To scan the Username file
        Scanner scPass = new Scanner(pass).useDelimiter("#");
        Username = txtUsername.getText(); //This gets the user input
        Password = txtPassword.getText(); //This gets the user input
        int pos = 0; //Indicates the position of the Username in the save file

        while(scUser.hasNext())
        {
            pos = pos + 1;

            if(scUser.equals(Username))
            { //This is where it fails
                for (int i = 0; i <= 5; i++)
                {
                    while(scPass.hasNext())
                    {
                        System.out.print(scPass);
                    }
                }

                if(scPass.equals(Password))
                {
                    new Selection().setVisible(true);
                    this.dispose();
                }
                else
                {
                   JOptionPane.showMessageDialog(null,"Incorrect Password!");
                }
            }//This is where it works from. The above code is sketchy
            else
            {
                JOptionPane.showMessageDialog(null,"User Does Not Exist!");
            }
            scUser.close();
        }
    }
    catch (FileNotFoundException ex)
    {
        Logger.getLogger(Login.class.getName()).log(Level.SEVERE, null, ex);
    }
    catch (IOException ex)
    {
        Logger.getLogger(Login.class.getName()).log(Level.SEVERE, null, ex);
    }

}                                        

private void btnCreateActionPerformed(java.awt.event.ActionEvent evt) {                                          
   //Again this is from where Netbeans lets you edit
    try {
        File user = new File("C:\\Users\\John1012\\Documents\\NetBeansProjects\\PATProject\\src\\Battlefield4\\Batfield\\Users\\Username.txt"); //To create a universal file for Input & Output
        File pass = new File("C:\\Users\\John1012\\Documents\\NetBeansProjects\\PATProject\\src\\Battlefield4\\Batfield\\Users\\Password.txt"); //To create a universal file for Input & Output
        user.getParentFile().mkdirs(); //To denote the parent file
        pass.getParentFile().mkdirs(); //To denote the parent file
        Scanner scUser = new Scanner(user); //To scan the Username file
        Username = txtUsername.getText(); //This gets the user input
        Password = txtPassword.getText(); //This gets the user input

        if(scUser.nextLine().contains(Username)) //This reads the entire line and checks for an indexOf of those characters
        {
            JOptionPane.showMessageDialog(null,"User Already Exists!");
            scUser.close(); //Close the Scanner
        }
        else
        {
            scUser.close(); //Close the Scanner
            if("".equals(Password) || " ".equals(Password)) //Checks to see whether or not the user entered a password
            {
                JOptionPane.showMessageDialog(null,"Please Enter A Password!");
            }
            else
            {
               PrintWriter pwUser = new PrintWriter(new FileWriter(user,true)); //To Write to the Username file
               PrintWriter pwPass = new PrintWriter(new FileWriter(pass,true)); //To Write to the Password file
               pwUser.print(Username + "#");
               pwPass.print(Password + "#");
               pwUser.close();
               pwPass.close();

               new Selection().setVisible(true);
               this.dispose();
            }
        }
        scUser.close();
    }
    catch (FileNotFoundException ex)
    {
        Logger.getLogger(Login.class.getName()).log(Level.SEVERE, null, ex);
    }
    catch (IOException ex)
    {
        Logger.getLogger(Login.class.getName()).log(Level.SEVERE, null, ex);
    }

}                                         
 //Can no longer edit here
 public static void main(String args[]) {

    try {
        for (javax.swing.UIManager.LookAndFeelInfo info : javax.swing.UIManager.getInstalledLookAndFeels()) {
            if ("Nimbus".equals(info.getName())) {
                javax.swing.UIManager.setLookAndFeel(info.getClassName());
                break;
            }
        }
    } catch (ClassNotFoundException ex) {
        java.util.logging.Logger.getLogger(Login.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
    } catch (InstantiationException ex) {
        java.util.logging.Logger.getLogger(Login.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
    } catch (IllegalAccessException ex) {
        java.util.logging.Logger.getLogger(Login.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
    } catch (javax.swing.UnsupportedLookAndFeelException ex) {
        java.util.logging.Logger.getLogger(Login.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
    }

    java.awt.EventQueue.invokeLater(new Runnable() {
        public void run() {
            new Login().setVisible(true);
        }
    });
}

// Variables declaration - do not modify                     
private javax.swing.JButton btnCreate;
private javax.swing.JButton btnLogin;
private javax.swing.JLabel jLabel1;
private javax.swing.JLabel lblPassword;
private javax.swing.JLabel lblUsername;
private javax.swing.JTextField txtPassword;
private javax.swing.JTextField txtUsername;
// End of variables declaration                   
}

包战场4；
导入javax.swing.*；
导入java.util.*；
导入java.io.*；
导入java.util.logging.Level；
导入java.util.logging.Logger；
公共类登录扩展了javax.swing.JFrame
{
字符串用户名；
字符串密码；
公共登录（）
{
初始化组件（）；
}
//从此处无法编辑
私有组件（）{
txtUsername=newjavax.swing.JTextField（）；
txtPassword=newjavax.swing.JTextField（）；
lblPassword=newjavax.swing.JLabel（）；
lblUsername=newjavax.swing.JLabel（）；
btnLogin=newjavax.swing.JButton（）；
btnCreate=newjavax.swing.JButton（）；
jLabel1=newjavax.swing.JLabel（）；
setDefaultCloseOperation（javax.swing.WindowConstants.EXIT_ON_CLOSE）；
setSize（新java.awt.Dimension（854480））；
getContentPane（）.setLayout（new org.netbeans.lib.awtextra.AbsoluteLayout（））；
getContentPane（）.add（txtUsername，new org.netbeans.lib.awtextra.AbsoluteConstraints（320150210，-1））；
getContentPane（）.add（txtPassword，new org.netbeans.lib.awtextra.AbsoluteConstraints（320220210，-1））；
lblPassword.setText（“密码”）；
getContentPane（）.add（lblPassword，new org.netbeans.lib.awtextra.AbsoluteConstraints（320200，-1，-1））；
lblUsername.setText（“用户名”）；
getContentPane（）.add（lblUsername，new org.netbeans.lib.awtextra.AbsoluteConstraints（320130，-1，-1））；
btnLogin.setText（“登录”）；
btnLogin.addActionListener（新的java.awt.event.ActionListener（）{
public void actionPerformed（java.awt.event.ActionEvent evt）{
执行的BTN（evt）；
}
});
getContentPane（）.add（btnLogin，new org.netbeans.lib.awtextra.AbsoluteConstraints（320290，-1，-1））；
btnCreate.setText（“创建”）；
btnCreate.addActionListener（新的java.awt.event.ActionListener（）{
public void actionPerformed（java.awt.event.ActionEvent evt）{
执行的BTN创建操作（evt）；
}
});
getContentPane（）.add（btnCreate，new org.netbeans.lib.awtextra.AbsoluteConstraints（460290，-1，-1））；
jLabel1.setIcon（新的javax.swing.ImageIcon（getClass（）.getResource（“/Battlefield4/Batfield/Background/Login（Small.jpg”））；//NOI18N
jLabel1.setText（“jLabel1”）；
getContentPane（）.add（jLabel1，new org.netbeans.lib.awtextra.AbsoluteConstraints（0,0860480））；
包装（）；
}                        
//在此之前无法编辑
私有void btnLoginActionPerformed（java.awt.event.ActionEvent evt）{
//这是Netbeans允许您编辑代码的地方。
试一试{
File user=new File（“C:\\Users\\John1012\\Documents\\NetBeansProjects\\PATProject\\src\\Battlefield4\\Batfield\\Users\\Username.txt”）；//为输入和输出创建通用文件
File pass=new File（“C:\\Users\\John1012\\Documents\\NetBeansProjects\\PATProject\\src\\Battlefield4\\Batfield\\Users\\Password.txt”）；//为输入和输出创建通用文件
user.getParentFile（）.mkdirs（）；//表示父文件
pass.getParentFile（）.mkdirs（）；//表示父文件
Scanner scUser=new Scanner（user）。使用分隔符（“#”）；//扫描用户名文件
Scanner scPass=新扫描仪（pass）。使用分隔符（“#”）；
Username=txtUsername.getText（）；//这将获取用户输入
Password=txtPassword.getText（）；//这将获取用户输入
int pos=0；//表示用户名在保存文件中的位置
while（scUser.hasNext（））
{
pos=pos+1；
if（scUser.equals（用户名））
{//这就是它失败的地方
for（int i=0；i在启动时映射所有用户，然后只需检查映射。使用split分隔用户名和密码。在调用onLoginCorrect（）之前，检查输入是否为空

private static final Logger LOG=LogManager.getLogger（）；
私有最终映射用户=新ConcurrentHashMap（）；
公共登录（）{
超级（）；
final InputStream resource=this.getClass（）.getResourceAsStream（“/users.txt”）；
最终扫描仪=新扫描仪（资源）；
while（scanner.hasNext（））{
最终字符串输入=scanner.nextLine（）；
最后一个字符串[]userPw=StringUtils.split（输入“：”）；
this.users.put（userPw[0]，userPw[1]）；
}
scanner.close（）；
IOUtils.closes（资源）；
}
公共布尔值isLoginCorrect（最终字符串用户名、最终字符串密码）{
最终布尔结果；
if（StringUtils.equals（this.users.get（用户名）、密码））{
结果=真；
}否则{
Login.LOG.warn（“没有这样的用户”）；
结果=假；
}
返回结果；
}
所以我想出了办法。谢谢大家的帮助

我将此作为一种更简单的方法发布到@Tobi，希望能帮助那些没有那么先进或需要更简单帮助的人

private void btnLoginActionPerformed(java.awt.event.ActionEvent evt) {                                         

    try {
        File user = new File("src\\Battlefield4\\Batfield\\Users\\Username.txt"); //To create a universal file for Input & Output
        File pass = new File("src\\Battlefield4\\Batfield\\Users\\Password.txt"); //To create a universal file for Input & Output
        user.getParentFile().mkdirs(); //To denote the parent file
        pass.getParentFile().mkdirs(); //To denote the parent file
        Scanner scUser = new Scanner(user).useDelimiter("#"); //To scan the Username file
        Scanner scPass = new Scanner(pass).useDelimiter("#"); //To scan the password file
        username = txtUsername.getText(); //This gets the user input
        password = txtPassword.getText(); //This gets the user input
        int pos = 0; //Indicates the position of the Username in the save file
        boolean loggedIn = false; //Flag to check if it's logged in

        while(scUser.hasNext() && scPass.hasNext()) //Runs files in congruency
        {
            if(scUser.next().equalsIgnoreCase(username) && scPass.next().equals(password))
            {
                loggedIn = true;
                scUser.close();
                scPass.close();
                new Selection(username).setVisible(true);
                this.dispose();
                break;
            }
        }
        scUser.close();
        scPass.close();
        if(loggedIn == false)
        {
            JOptionPane.showMessageDialog(null,"Incorrect Username or Password!");
        }

    }
    catch (FileNotFoundException ex)
    {
        Logger.getLogger(Login.class.getName()).log(Level.SEVERE, null, ex);
    }

}                                        

只需使用一个文本文件，就可以编写
private void btnLoginActionPerformed(java.awt.event.ActionEvent evt) {                                         

    try {
        File user = new File("src\\Battlefield4\\Batfield\\Users\\Username.txt"); //To create a universal file for Input & Output
        File pass = new File("src\\Battlefield4\\Batfield\\Users\\Password.txt"); //To create a universal file for Input & Output
        user.getParentFile().mkdirs(); //To denote the parent file
        pass.getParentFile().mkdirs(); //To denote the parent file
        Scanner scUser = new Scanner(user).useDelimiter("#"); //To scan the Username file
        Scanner scPass = new Scanner(pass).useDelimiter("#"); //To scan the password file
        username = txtUsername.getText(); //This gets the user input
        password = txtPassword.getText(); //This gets the user input
        int pos = 0; //Indicates the position of the Username in the save file
        boolean loggedIn = false; //Flag to check if it's logged in

        while(scUser.hasNext() && scPass.hasNext()) //Runs files in congruency
        {
            if(scUser.next().equalsIgnoreCase(username) && scPass.next().equals(password))
            {
                loggedIn = true;
                scUser.close();
                scPass.close();
                new Selection(username).setVisible(true);
                this.dispose();
                break;
            }
        }
        scUser.close();
        scPass.close();
        if(loggedIn == false)
        {
            JOptionPane.showMessageDialog(null,"Incorrect Username or Password!");
        }

    }
    catch (FileNotFoundException ex)
    {
        Logger.getLogger(Login.class.getName()).log(Level.SEVERE, null, ex);
    }

}