How to archive username in Java? [SOLVED]

Introduction

To "archive the username" in Java means to store the username for later access and retrieval. This may mean storing the username in a variable, class field, session attribute, cookie, or database.

Archiving usernames is important. Because this allows us to keep track of the user's identity and provides a way to access the user's information (preferences, etc.) during the user's session or even after the session has ended. It can also be used to authenticate users, check user permissions, or personalize user experience.

 

Different methods to archive username in Java

In Java, you can archive a username in several ways, some common ways are:

 

Method-1: Store the username in a variable

String username = "AmitKumar";

 

Method-2: Store the username in a class field

public class User {
    private String username;

    public User(String username) {
        this.username = username;
    }
}

 

Method-3: Store the username in a session attribute

HttpSession session = request.getSession();
session.setAttribute("username", "AmitKumar");

 

Method-4: Store the username in a cookie

Cookie userCookie = new Cookie("username", "AmitKumar");
response.addCookie(userCookie);

 

Method-5: Store the username in a database

String sql = "INSERT INTO users (username) VALUES (?)";
PreparedStatement statement = conn.prepareStatement(sql);
statement.setString(1, "AmitKumar");
statement.executeUpdate();

 

Example-1: Storing the username in a global variable

This example creates a UserManager class with a username variable, which is set as a global variable. This means that the variable can be accessed from anywhere in the application. The setUsername method is used to set the value of the username variable.

public class UserManager {
    public static String username;
    public static void setUsername(String user) {
        username = user;
    }
}

 

Example-2: Storing the username in a file

In this example, the main method takes a String array as a parameter, which is the command-line arguments passed to the program. Inside the main method, I am saving the username AmitKumar and then I am reading the username from the file and printing it on the console.

import java.io.*;

public class FileManager {
    public static void saveUsername(String username) {
        try (FileWriter fw = new FileWriter("username.txt")) {
            fw.write(username);
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
    public static String readUsername() {
        try (BufferedReader br = new BufferedReader(new FileReader("username.txt"))) {
            return br.readLine();
        } catch (IOException e) {
            e.printStackTrace();
        }
        return null;
    }
    public static void main(String[] args) {
        String username = "AmitKumar";
        saveUsername(username);
        System.out.println("Username saved: " + username);
        String readUsername = readUsername();
        System.out.println("Username read: " + readUsername);
    }
}

This way you can run the FileManager class as a standalone application and test the functions.

 

Example-3: Storing the username in a properties file

There are a few different ways you could go about archiving a username in a properties file, depending on your specific use case. Here are a few options:

• You could create a new properties file with a different name or in a different location, and store the archived username there. For example, you could create a file called "archived_usernames.properties" and store the username in that file when it is no longer needed in the main properties file.
• Another option would be to add a new property to the existing properties file, such as "archived_username", and store the archived username there. This would keep all of the properties in one file, but would make it clear which username is no longer in use.
• You could also add a timestamp to the archived username property to keep track of when the username was archived. For example, you could have a property called "archived_username_2023-01-01" to indicate that the username was archived on January 1st, 2023.
• You can also use a Database to store the archived usernames and use a timestamp as a key for archiving with a username.

import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.Properties;

public class PropertiesManager {

    public void archiveUsername() {
        Properties prop = new Properties();
        try (InputStream input = new FileInputStream("config.properties")) {
            prop.load(input);
            String username = prop.getProperty("username");
            // archive the username
            prop.setProperty("archived_username", username);
            // remove the original username property
            prop.remove("username");
            // save the properties to the file
            try (OutputStream output = new FileOutputStream("config.properties")) {
                prop.store(output, null);
            } catch (IOException e) {
                e.printStackTrace();
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

The PropertiesHandler class is a public class which means it can be accessed by other classes in the package or by classes in other packages if the package is exported.

The archiveUsername() method is a public method that can be accessed by other classes in the package or by classes in other packages if the package is exported. Inside this method, the code does the following:

• Create a new Properties object, which is used to store key-value pairs in a file.
• Opens a FileInputStream to read the "config.properties" file.
• loads the properties from the file into the Properties object.
• retrieves the current "username" property from the Properties object.
• adds a new "archived_username" property with the same value as the "username" property.
• removes the "username" property from the Properties object.
• opens a FileOutputStream to write the properties object to the file.

 

Summary

In Java, there are a few different ways to store and retrieve a username. Some common methods include:

• Using a String variable to store the username and retrieving it later.
• Storing the username in a properties file or a configuration file and reading it into the program at runtime.
• Saving the username to a database and retrieving it later.
• Using the Java Preferences API to store the username and retrieve it later.

Each method has its own benefits and drawbacks, and the choice of which to use will depend on the specific requirements of your application.