Initilise project

.gitignore

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+##############################
+## Java
+##############################
+.mtj.tmp/
+*.class
+*.jar
+*.war
+*.ear
+*.nar
+hs_err_pid*
+replay_pid*
+
+##############################
+## Maven
+##############################
+target/
+pom.xml.tag
+pom.xml.releaseBackup
+pom.xml.versionsBackup
+pom.xml.next
+pom.xml.bak
+release.properties
+dependency-reduced-pom.xml
+buildNumber.properties
+.mvn/timing.properties
+.mvn/wrapper/maven-wrapper.jar
+
+##############################
+## IntelliJ
+##############################
+out/
+.idea/
+.idea_modules/
+*.iml
+*.ipr
+*.iws
+
+##############################
+## Eclipse
+##############################
+.settings/
+bin/
+tmp/
+.metadata
+.classpath
+.project
+*.tmp
+*.bak
+*.swp
+*~.nib
+local.properties
+.loadpath
+.factorypath
+
+##############################
+## NetBeans
+##############################
+nbproject/private/
+build/
+nbbuild/
+dist/
+nbdist/
+nbactions.xml
+nb-configuration.xml
+
+##############################
+## Visual Studio Code
+##############################
+.vscode/
+.code-workspace
+
+##############################
+## OS X
+##############################
+.DS_Store

README.md

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+# WHAT?
+Get the preconfigured OTP automatically in just 1 click, the OTP will be copied automatically, and you can paste on your application easily.
+
+You no longer have to:
+- Copy and paste your secret key, open a totp page on web browser, generate am OTP, copy and paste the generated OTP onto your application
+- Open your favourite password manager application, click to generate OTP, copy and paste the generated OTP onto your application
+
+# Prerequisite 
+You will need to have your secret key associated with your account before running this tool
+
+# HOW TO?
+
+Configure the secret:
+Use either the following method:
+- Open secret file and update your secret string as the file content
+- Edit the GetOTP.cmd file and add the secret string to the command as the parameter. See **Run the project** section below.
+
+Build the project:
+
+```bash
+mvn package
+```
+
+Run the project with terminal:
+
+```bash
+java -jar target/otp-generator-1.0-SNAPSHOT-jar-with-dependencies.jar
+```
+
+Quick run the project: Update the **GetOTP.cmd** file with following content:
+```bash
+java -jar target/otp-generator-1.0-SNAPSHOT-jar-with-dependencies.jar
+```
+
+Quick run the project with customized secret string: Update the **GetOTP.cmd** file with following content, and replace the sample secret string with your secret string:
+```bash
+java -jar target/otp-generator-1.0-SNAPSHOT-jar-with-dependencies.jar JBSWY3DPEHPK3PXPJBSWY3DPEHPK3PXP
+```
+
+Attach the command above into a Batch or Command file. Single click onto the command file will get the OTP automatically.

pom.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+
+    <groupId>com.thanhhoang</groupId>
+    <artifactId>otp-generator</artifactId>
+    <version>1.0-SNAPSHOT</version>
+    <packaging>jar</packaging>
+
+    <properties>
+        <maven.compiler.source>17</maven.compiler.source>
+        <maven.compiler.target>17</maven.compiler.target>
+        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+    </properties>
+    <dependencies>
+        <dependency>
+            <groupId>com.j256.two-factor-auth</groupId>
+            <artifactId>two-factor-auth</artifactId>
+            <version>1.3</version>
+        </dependency>
+    </dependencies>
+    <build>
+        <plugins>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-assembly-plugin</artifactId>
+                <version>3.6.0</version>
+                <configuration>
+                    <archive>
+                        <manifest>
+                            <mainClass>
+                                com.thanhhoang.OTPGenerator
+                            </mainClass>
+                        </manifest>
+                    </archive>
+                    <descriptorRefs>
+                        <descriptorRef>jar-with-dependencies</descriptorRef>
+                    </descriptorRefs>
+                </configuration>
+
+                <executions>
+                    <execution>
+                        <id>all</id>
+                        <phase>package</phase>
+                        <goals>
+                            <goal>single</goal>
+                        </goals>
+                    </execution>
+                </executions>
+            </plugin>
+        </plugins>
+    </build>
+</project>

secret.txt

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+JBSWY3DPEHPK3PXPJBSWY3DPEHPK3PXP

src/main/java/com/thanhhoang/OTPGenerator.java

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+package com.thanhhoang;
+
+import com.j256.twofactorauth.TimeBasedOneTimePasswordUtil;
+
+import java.awt.*;
+import java.awt.datatransfer.Clipboard;
+import java.awt.datatransfer.StringSelection;
+import java.io.File;
+import java.io.FileNotFoundException;
+import java.security.GeneralSecurityException;
+import java.util.Scanner;
+
+public class OTPGenerator {
+    private static String secret;
+    public static void main(String... args) throws GeneralSecurityException {
+        try {
+            File myObj = new File("secret.txt");
+            Scanner myReader = new Scanner(myObj);
+            // Read the first line only
+            if (myReader.hasNextLine()) {
+                secret = myReader.nextLine();
+                System.out.println(secret);
+            }
+            myReader.close();
+        } catch (FileNotFoundException e) {
+            System.out.println("An error occurred.");
+            e.printStackTrace();
+        }
+        String otp = TimeBasedOneTimePasswordUtil.generateCurrentNumberString(args.length == 0 ? secret : args[0]);
+        System.out.println("OTP Code generated: " + otp);
+        StringSelection stringSelection = new StringSelection(otp);
+        Clipboard clipboard = Toolkit.getDefaultToolkit().getSystemClipboard();
+        clipboard.setContents(stringSelection, null);
+    }
+}