Login on java based from txt file

debugcn 投稿 Dev

user8775227

need help!, i have an assignment i need to make an login txt based, my program only read the first line

the txt look like this

Luthfi Luthfi Fitra
Fitra Fitra Khori
Khori Fitra Syifa

but it only read the first, so i could log in only using the top account here is my code

        public Login() {
    initComponents();
    txtPass.setText("");
}

public void Masuk(){
try {
String lokasi = "D:/settings.txt";
String username = txtUser.getText();
String password = txtPass.getText();


        FileReader fr = new FileReader(lokasi);
        BufferedReader br = new BufferedReader(fr);
        String line,user,pass;
        boolean isLoginSuccess = false;
       while ((line = br.readLine()) != null) {
           user = line.split(" ")[1].toLowerCase();
    pass = line.split(" ")[2].toLowerCase();
           if (user.equals(username) && pass.equals(password)){
               isLoginSuccess = true;
               this.dispose();
               MainMenu mm = new MainMenu();
               mm.setLocationRelativeTo(null);
               mm.setVisible(true);
               break;
           }
           else{
               JOptionPane.showMessageDialog(null, "USERNAME/PASSWORD SALAH","WARNING!!",JOptionPane.WARNING_MESSAGE);
               break;
           }
       }
       fr.close();

}catch(Exception e){
e.printStackTrace();
    }
        }

also why is everytime i insert the correct username and id it shows me that im succses but it show me the USERNAME/PASSWORD IS WRONG too

thaveethu gce

You have problem in getting substring from file, change code like following snipet

        user = line.substring(0, 6).toLowerCase();
        pass = line.substring(7, 12).toLowerCase();

Update: Based on your comment , i am changing my solution

1) Change your file format like this

Luthfi Luthfi Hehe
Fitra Luthfi Khori
Syifa Khori Luthfi
Khori Syifa Luthfi

here first word in each line is user name and second word is password

2) Change your code like following

            user = line.split(" ")[1].toLowerCase();
            pass = line.split(" ")[2].toLowerCase();

3) if any username and password match, make login and break from while loop

Update again

package problems;

import java.io.BufferedReader;
import java.io.FileReader;

public class FileRd {

    public static void main(String args[]) {
        try {
            String lokasi = "D:/settings.txt";
            String username = txtUser.getText();
            String password = txtPass.getText();

            FileReader fr = new FileReader(lokasi);
            BufferedReader br = new BufferedReader(fr);
            String line, user, pass;
            boolean isLoginSuccess = false;
            while ((line = br.readLine()) != null) {
                user = line.split(" ")[1].toLowerCase();
                pass = line.split(" ")[2].toLowerCase();
                if (user.equals(username) && pass.equals(password)) {
                    isLoginSuccess = true;
                    this.dispose();
                    MainMenu mm = new MainMenu();
                    mm.setLocationRelativeTo(null);
                    mm.setVisible(true);
                    break;
                } 
            }
            if (!isLoginSuccess) {
                JOptionPane.showMessageDialog(null, "USERNAME/PASSWORD WRONG", "WARNING!!", JOptionPane.WARNING_MESSAGE);
            }
            fr.close();

        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

この記事はインターネットから収集されたものであり、転載の際にはソースを示してください。

侵害の場合は、連絡してください[email protected]