I recently had the privilege of working on a project that required me to develop a straightforward Java-based login page. In this article, I will share the code I utilized for the login page and also offer some personal commentary and insights throughout the process.
Creating the Login Page
To start off, I created a new Java class called LoginPage to encapsulate all the login page functionality. I decided to follow the Model-View-Controller (MVC) pattern to keep my code organized and maintainable. This pattern separates the concerns of data, presentation, and control, allowing for easier management of the codebase.
In the LoginPage class, I first created instance variables to hold the username and password entered by the user. These variables would be used later to validate the login credentials.
private String username;
private String password;
Next, I added a constructor to initialize the LoginPage object. In this constructor, I set the initial values of the username and password variables to empty strings.
public LoginPage() {
username = "";
password = "";
}
Moving on, I created getters and setters for the username and password variables. These methods would allow other parts of the code to access and modify these variables as needed.
public String getUsername() {
return username;
}
public void setUsername(String username) {
this.username = username;
}
public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password;
}
After setting up the necessary variables and methods, I created a method called validateCredentials() to check if the entered username and password are valid. In this method, I compared the entered values with a predefined set of username and password combinations.
public boolean validateCredentials() {
// Hardcoding the valid credentials for demonstration purposes
String validUsername = "admin";
String validPassword = "password123";
return username.equals(validUsername) && password.equals(validPassword);
}
To display the login page to the user, I created a method called renderLoginPage(). In this method, I used the System.out statements to print out the necessary HTML code for the login page. I also used the Scanner class to read the user input for the username and password.
import java.util.Scanner;
public void renderLoginPage() {
Scanner scanner = new Scanner(System.in);
System.out.println("<h2>Login Page</h2>");
System.out.println("<form>");
System.out.println("Username: <input type='text' name='username' /><br>");
System.out.println("Password: <input type='password' name='password' /><br>");
System.out.println("<input type='submit' value='Login' />");
System.out.println("</form>");
System.out.print("Enter your username: ");
username = scanner.nextLine();
System.out.print("Enter your password: ");
password = scanner.nextLine();
}
Personal Commentary and Insights
Creating this simple login page using Java was a great learning experience for me. It allowed me to practice object-oriented programming concepts and understand the importance of separating concerns in code organization.
One thing I found interesting was the use of the MVC pattern in this project. This pattern helped me keep my code clean and maintainable by separating the data, presentation, and control aspects of the login page. It allowed me to easily make changes to one part of the code without affecting the others.
Another aspect that stood out to me was the use of the Scanner class to read user input from the command line. This allowed me to interact with the login page and test its functionality directly from the console. It was a convenient way to get user input without the need for a graphical user interface.
Conclusion
In conclusion, creating a simple login page using Java was a valuable learning experience. It taught me about the MVC pattern, object-oriented programming, and user input handling in the command line. By following best practices and separating concerns, I was able to create a clean and maintainable codebase. I hope this article has provided you with insights and inspiration for your own Java projects.
If you’d like to see the code for the login page, you can find it here.