What are the commonly used logging tools in Java function libraries?

Commonly used logging tools in Java function libraries include: 1. java.util.logging: built-in API, providing basic functions; 2. Apache Log4j: third-party library, providing advanced functions; 3. SLF4j: abstraction layer, allowing Use different implementations and need to be used in conjunction with specific implementations (such as Log4j).

Common logging tools in Java function libraries

Logging is a key task in software development. It is used to record application events and activities to troubleshoot and improve serviceability. The Java function library provides a variety of logging tools out of the box. Here are some of the most commonly used ones:

1. java.util.logging

java.util.logging is the logging API built into Java SE and EE. It provides a simple and easy-to-use logging framework with rich features, including:

• Multiple log levels (FINE, INFO, WARNING, etc.)
• Configurable logs Format
• Logging processor, used to control the location of log output

Example:

import java.util.logging.Logger;

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

    public static void main(String[] args) {
        logger.info("这是个信息消息");
        logger.warning("这是个警告消息");
    }
}

2. Apache Log4j

Log4j is a popular third-party logging library that provides more powerful features than java.util.logging, including:

• Highly configurable log format
• Supports log output in multiple formats (e.g. console, file, network)
• Advanced filtering and routing capabilities

Example:

First you need to add the Log4j dependency to the project:

<dependency>
    <groupId>org.apache.logging.log4j</groupId>
    <artifactId>log4j-api</artifactId>
    <version>2.17.1</version>
</dependency>

Then configure Log4j in the code:

import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;

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

    public static void main(String[] args) {
        logger.info("这是个信息消息");
        logger.warn("这是个警告消息");
    }
}

3. SLF4J

SLF4j (Simple Logging Facade) is an abstraction layer for a logging library that allows applications to use different logging implementations. It provides a simple and unified API that masks differences in the underlying logging libraries.

SLF4j needs to be used with a concrete logging implementation, such as Log4j or Logback.

Example:

First, add the SLF4j dependency to the project:

<dependency>
    <groupId>org.slf4j</groupId>
    <artifactId>slf4j-api</artifactId>
    <version>1.7.36</version>
</dependency>

Then, select a specific logging implementation, such as Log4j:

<dependency>
    <groupId>org.apache.logging.log4j</groupId>
    <artifactId>log4j-slf4j-impl</artifactId>
    <version>2.17.1</version>
</dependency>

Finally, configure SLF4j in the code:

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

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

    public static void main(String[] args) {
        logger.info("这是个信息消息");
        logger.warn("这是个警告消息");
    }
}

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