How to integrate Apache Log4J Core framework in the Java project

Integrating Apache Log4J Core framework in the Java project can help developers better manage and record log information of applications.The LOG4J Core framework can easily achieve log level control, formatting of log information, log file output, and multi -threaded security.The following will introduce how to integrate this framework in the Java project. Step 1: Download log4j core framework First, you need to download the latest version of the log4j Core framework from Apache's official website (https://logging.apache.org/log4j/2.x/).After the download is completed, decompress the folder. Step 2: Import log4j core frame library Copy all the library files (jar files) in the compressed folder and copy it to the lib folder in your Java project.Then add them to the project path of the project through IDE (eclipse or Intellij IDEA). Step 3: Create log4j2.xml configuration file Create a log4j2.xml file under your resource folder of your Java project.This file will be used to configure related parameters of the LOG4J CORE framework, such as log -level, output targets, etc.The following is the configuration of an example: <Configuration status="INFO"> <Appenders> <Console name="Console" target="SYSTEM_OUT"> <PatternLayout pattern="%d [%t] %-5level %logger{36} - %msg%n"/> </Console> </Appenders> <Loggers> <Root level="info"> <AppenderRef ref="Console"/> </Root> </Loggers> </Configuration> The above configuration outputs the log information to the console, and includes a timestamp, thread name, log level, recorder name and message content. Step 4: Use LOG4J CORE in Java code In your Java code, you can use the log4j core framework to record log information.First, you need to import the related class of log4j core: import org.apache.logging.log4j.LogManager; import org.apache.logging.log4j.Logger; Then you can create a logger object in the code and use its method to record the log information: public class MyClass { private static final Logger logger = LogManager.getLogger(MyClass.class); public static void main(String[] args) { logger.debug("This is a debug message."); logger.info("This is an info message."); logger.warn("This is a warning message."); logger.error("This is an error message."); } } In the above example, a logger object is created through the getlogger method, and different levels of log information is recorded using its debug, info, warn, and error methods. Step 5: Run the Java project and view the log output Now, you can run your Java project and check the console output.According to the settings in the above log4j2.xml configuration file, you should be able to see the corresponding level log information on the console. Through the above steps, you can successfully integrate the LOG4J Core framework in the Java project and use its functions to record and manage the log information of the application.Hope this article will help you!