Java日志

下面为你综合整理了 SLF4J + Logback、Log4j2 两种主流日志方案的依赖和典型用法，适用于 Java 项目（以 Maven 为例）。

1. SLF4J + Logback

1.1 Maven 依赖

<!-- SLF4J API -->
<dependency>
    <groupId>org.slf4j</groupId>
    <artifactId>slf4j-api</artifactId>
    <version>2.0.13</version>
</dependency>
<!-- Logback 实现 -->
<dependency>
    <groupId>ch.qos.logback</groupId>
    <artifactId>logback-classic</artifactId>
    <version>1.4.14</version>
</dependency>

1.2 典型用法

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

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

    public void addTask(Object task) {
        log.debug("task 添加成功 ，{}", task);
    }
}

2. Log4j2

2.1 Maven 依赖

<!-- Log4j2 API 和核心实现 -->
<dependency>
    <groupId>org.apache.logging.log4j</groupId>
    <artifactId>log4j-api</artifactId>
    <version>2.20.0</version>
</dependency>
<dependency>
    <groupId>org.apache.logging.log4j</groupId>
    <artifactId>log4j-core</artifactId>
    <version>2.20.0</version>
</dependency>

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

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

    public void addTask(Object task) {
        log.debug("task 添加成功 ，{}", task);
    }
}

3. SLF4J 门面 + Log4j2 实现（可选）

如果你想用 SLF4J 的 API，但底层用 Log4j2：

<!-- SLF4J API -->
<dependency>
    <groupId>org.slf4j</groupId>
    <artifactId>slf4j-api</artifactId>
    <version>2.0.13</version>
</dependency>
<!-- Log4j2 作为 SLF4J 的实现 -->
<dependency>
    <groupId>org.apache.logging.log4j</groupId>
    <artifactId>log4j-slf4j2-impl</artifactId>
    <version>2.20.0</version>
</dependency>

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

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

    public void addTask(Object task) {
        log.debug("task 添加成功 ，{}", task);
    }
}

5. 参考资料

• SLF4J 官网 SLF4J Manual

• Logback 官网 Logback Home

• Log4j2 官网 https://logging.apache.org/log4j/2.x/