What is the method for logging in log4j?

The method of logging with log4j is as follows:

1. You can import the necessary log4j dependency packages using tools such as Maven or Gradle.
2. Create a configuration file for log4j. Within the project’s resource folder, create a file named log4j.properties or log4j.xml to specify the logging rules and destinations for log4j.
3. Incorporate the log4j package in the code and initialize the logging object. You can initialize log4j using the following code:

import org.apache.log4j.Logger;

public class MyClass {
    private static final Logger logger = Logger.getLogger(MyClass.class);

    public void myMethod() {
        logger.debug("Debug message");
        logger.info("Info message");
        logger.warn("Warning message");
        logger.error("Error message");
    }
}

1. Utilize a logger in the code to output logs. Output log information of different levels by calling different methods of the logger object, such as debug, info, warn, and error.
2. According to the rules set in the log4j configuration file, the logs will be output to a specified destination such as the console, file, database, etc.

Please note:

1. In the log4j configuration file, you can specify the log level, output format, output location, and other information, and customize it as needed.
2. Logger objects are typically created as classes, and can use the class name as the logger’s name, making it easier to identify the source of the log in the log.