Lompat ke konten Lompat ke sidebar Lompat ke footer

Java Login And Register Form With Text File

How to Create Login and Register Form in Java NetBeans with Text File

How to Create Login and Register Form in Java NetBeans with Text File Java Login And Register Form With Text File



In this Java Long Tutorial we will go step by step on How To Make a Design a Login Form And a Register Form, plus how to use those two form with a text file so the user can signup and signin.   

What We Are Gonna Use In This Project:

- Java Programming Language.
- NetBeans Editor.
- Text File.

What We Will Do In This Project:

- Design One Form For The Login and Signup Using JPanels and Borders.
- Add an Icon Using JLabels To Close The Form.
- add Data into the text File When User Register.
- Allow The User to Login.
- Check If The User Leave Some Fields Empty.
- Check If The User Enter Username That Already Exists.
- Check If The User Enter a Wrong Password In The Confirmation Field.  
- Create a Message orm To Display When An Error Occure or To Display Any Information.
- Create a Main Form to Display After The User Login.





Project Source Code:

   
        // create a border for the jpanel
    Border panel_border = BorderFactory.createMatteBorder(2, 2, 2, 2, Color.gray);
    // create a border for the textfields
    Border textfields_border = BorderFactory.createMatteBorder(0, 0, 2, 0, Color.white);
    // optional red border
    Border textfields_red_border = BorderFactory.createMatteBorder(0, 0, 2, 0, Color.red);
    // create a border for the jlabels
    Border lbl_border = BorderFactory.createMatteBorder(0, 0, 2, 0, Color.lightGray);
    // the file path -> C:\Users\1BestCsharp\Desktop\java_app
    String usersFilePath = "C:\\Users\\1BestCsharp\\Desktop\\java_app\\users.txt";
    // array of all usernames
    ArrayList all_usernames = new ArrayList<>();
    // a hashmap of usernames and password
    Map usernameANDpassword = new HashMap<>();
    // the message frame
    Message_Frame msgF = new Message_Frame();


    public Login_And_Register() {
        initComponents();
        
        // image link: https://pixabay.com/vectors/cross-no-x-forbidden-closed-42928/
        // display close images in jlabel
        displayImage();
        
        // center the form
        this.setLocationRelativeTo(null);
        
        // set borders
        jPanel_main.setBorder(panel_border);
        jLabel_login_title.setBorder(lbl_border);
        jLabel_register_title.setBorder(lbl_border);
        jTextField_login_username.setBorder(textfields_border);
        jPasswordField_login_pass.setBorder(textfields_border);
        jTextField_register_username.setBorder(textfields_border);
        jTextField_register_fullname.setBorder(textfields_border);
        jTextField_register_email.setBorder(textfields_border);
        jPasswordField_register_pass.setBorder(textfields_border);
        jPasswordField_register_confirmPass.setBorder(textfields_border);
        
        getUsers();
        
        // test
        /*
        for(String uname:all_usernames)
        {
            System.out.println(uname);
        }
        */
        
    }


    // create a function to get all users
    public void getUsers()
    {
       
        // the info structure will be like this
        /*
        Username: aaa
        Fullname: bbb ccc
        Email: abc@mail.com
        Password: pass123
        ---
        */
        
        File file = new File(usersFilePath);
        String username = "";
        String password = "";
        
        try {
            
            FileReader fr = new FileReader(file);
            BufferedReader br = new BufferedReader(fr);
            
            // read line by line from the text file
            Object[] lines = br.lines().toArray();
            for(int i = 0; i < lines.length; i++)
            {  
                // splite the row into two rows
                // one for the name of the field
                // and the other for the value of the field
                String[] row = lines[i].toString().split(": ");
                
                if(row[0].equals("Username"))
                {
                    // if it's the username field we will get the username
                    username = row[1];
                    // add the username to the all username array
                    all_usernames.add(username);
                }
                else if(row[0].equals("Password"))
                {
                    // if it's the password field we will get the password
                    password = row[1];
                }
                if(!username.equals("") && !password.equals(""))
                {
                    // add the username and the password to the hashmap
                    usernameANDpassword.put(username, password);
                }
                
            }

            
        } catch (FileNotFoundException ex) {
            Logger.getLogger(Login_And_Register.class.getName()).log(Level.SEVERE, null, ex);
        }
        
        
    }
    
    
    // create a function to check if the username already exist
    public boolean checkIfUsernameExist(String un)
    {
        boolean exist = false;
        
        for(String username: all_usernames)
        {
            if(username.equals(un))
            {
                exist = true;
            }
        }
        
        return exist;
    }
    
    
    // function to display image
    public void displayImage()
    {
        ImageIcon imgico = new ImageIcon(getClass().getResource("\\/images/x.png"));
        Image img = imgico.getImage().getScaledInstance(jLabel_close_.getWidth(), jLabel_close_.getHeight(), Image.SCALE_SMOOTH);
        jLabel_close_.setIcon(new ImageIcon(img));
    }


    private void jLabel_close_MouseClicked(java.awt.event.MouseEvent evt) {                                           
        // close the form
        this.dispose();
    }                                          

    private void jButton_register_ActionPerformed(java.awt.event.ActionEvent evt) {                                                  
        // get the textfields data
        String username = jTextField_register_username.getText().trim();
        String fullname = jTextField_register_fullname.getText().trim();
        String email = jTextField_register_email.getText().trim();
        String password = String.valueOf(jPasswordField_register_pass.getPassword()).trim();
        String confirm_password = String.valueOf(jPasswordField_register_confirmPass.getPassword()).trim();
        
        File file = new File(usersFilePath);
        
        try {
            // file = the file we want to write on
            // true = we wan to append the text on it
            FileWriter fw = new FileWriter(file, true);
            
            // we need to check if the textfields are empty
            // we need to check if the confirmation password equal the password
            // we need to check if the username already exist
          
            // check if the textfields are empty
            if( username.equals("") || fullname.equals("") || email.equals("") || password.equals("") )
            {
                System.out.println("One Or More Fields Are Empty");
                msgF.jLabel_Title.setText("Signup Error");
                msgF.jLabel_message.setText("One Or More Fields Are Empty");
            }
            else{
                // confirmation password
                if(password.equals(confirm_password))
                {
                    // check if the username already exist
                    if(!checkIfUsernameExist(username))
                    {
                        fw.write("Username: " + username);
                        fw.write(System.getProperty("line.separator"));
                        fw.write("Fullname: " + fullname);
                        fw.write(System.getProperty("line.separator"));
                        fw.write("Email: " + email);
                        fw.write(System.getProperty("line.separator"));
                        fw.write("Password: " + password);
                        fw.write(System.getProperty("line.separator"));
                        fw.write("---");
                        fw.write(System.getProperty("line.separator"));
                        fw.close(); 
                        // populate the array and hashmap
                        getUsers();
                        
                        msgF.jLabel_Title.setText("Signup");
                        msgF.jLabel_message.setText("You Have Created A New Account Successfully");
                        
                    }
                    else
                    {
                       System.out.println("This Username Already Exist, Try Another One");  
                       msgF.jLabel_Title.setText("Signup Error");
                       msgF.jLabel_message.setText("This Username Already Exist, Try Another One");
                    }

                }
                else
                {
                    System.out.println("Password Confirmation Error");
                    msgF.jLabel_Title.setText("Signup Error");
                    msgF.jLabel_message.setText("The Confirmation Password Does Not Match");
                }
            }
            
            msgF.setVisible(true);
            
        } catch (IOException ex) {
            Logger.getLogger(Login_And_Register.class.getName()).log(Level.SEVERE, null, ex);
        }
        
        
    }                                                 

    private void jButton_login_ActionPerformed(java.awt.event.ActionEvent evt) {                                               
        // get the username and password
        // the hashmap is unorderd
        String username = jTextField_login_username.getText().trim();
        String password = String.valueOf(jPasswordField_login_pass.getPassword()).trim();
        boolean userExist = false;
        
        
        // check if the fields are empty
        if(username.equals("") || password.equals(""))
        {
            msgF.jLabel_Title.setText("Login Error");
            msgF.jLabel_message.setText("You Need To Enter The Username And Password");
            msgF.setVisible(true);
            
            // you can change the jpanel color
            // you can use if to check which one is empty
            // or you can change the border
            /*
            if(username.equals("")){
                //jPanel_username.setBackground(Color.red);
                jTextField_login_username.setBorder(textfields_red_border);
            }
            else if(password.equals("")){
                //jPanel_password.setBackground(Color.red);
                jPasswordField_login_pass.setBorder(textfields_red_border);
            }
            */
            
            
        }
        else
        { 
           for(String uname: usernameANDpassword.keySet())
           {
               // check if the username exist
            if(uname.equals(username))
            {
                // check if the password is correct
                if(usernameANDpassword.get(uname).equals(password))
                {
                    userExist = true;
                   System.out.println("Welcome To The Appliction");
                   /*
                   msgF.jLabel_Title.setText("Login Successfully");
                   msgF.jLabel_message.setText("Welcome To The Appliction");
                   */
                   // show the main app form
                   App_Main_Frame mainF = new App_Main_Frame();
                   mainF.jLabel_welcome_.setText("Welcome Back " + uname);
                   mainF.setVisible(true);
                   // close the login form
                   this.dispose();
                   // break out from the for loop
                   break;
                }
            }
            
           }// outside the for loop
           if(userExist == false)
                {
                   msgF.jLabel_Title.setText("Login Error");
                   msgF.jLabel_message.setText("This User Doesn't Exist");
                   msgF.setVisible(true);
                }
        }

    }                                              

    
    


////// OUTPUT : 

How to Create Login and Register Form in Java NetBeans with Text File Java Login And Register Form With Text File

How to Create Login and Register Form in Java NetBeans with Text File Java Login And Register Form With Text File

How to Create Login and Register Form in Java NetBeans with Text File Java Login And Register Form With Text File



How to Create Login and Register Form in Java NetBeans with Text File Java Login And Register Form With Text File



How to Create Login and Register Form in Java NetBeans with Text File Java Login And Register Form With Text File




More Java Projects:

Posting Komentar untuk "Java Login And Register Form With Text File"