springboot导入log4j依赖

你可以在Spring Boot项目中使用Log4j作为日志框架，以下是在Maven项目中导入Log4j的步骤：

1. 在 pom.xml 文件中添加以下依赖：

<dependency>
  <groupId>org.apache.logging.log4j</groupId>
  <artifactId>log4j-slf4j-impl</artifactId>
  <version>2.14.0</version>
</dependency>
<dependency>
  <groupId>org.apache.logging.log4j</groupId>
  <artifactId>log4j-api</artifactId>
  <version>2.14.0</version>
</dependency>
<dependency>
  <groupId>org.apache.logging.log4j</groupId>
  <artifactId>log4j-core</artifactId>
  <version>2.14.0</version>
</dependency>

2. 添加 log4j2.xml 配置文件到 src/main/resources 目录下，例如：

<?xml version="1.0" encoding="UTF-8"?>
<Configuration status="INFO">
  <Appenders>
    <Console name="Console" target="SYSTEM_OUT">
      <PatternLayout pattern="%d{yyyy-MM-dd HH:mm:ss.SSS} [%t] %-5level %logger{36} - %msg%n" />
    </Console>
  </Appenders>
  <Loggers>
    <Logger name="com.example" level="DEBUG" additivity="false">
      <AppenderRef ref="Console" />
    </Logger>
    <Root level="INFO">
      <AppenderRef ref="Console" />
    </Root>
  </Loggers>
</Configuration>

3. 在代码中使用 Log4j 记录日志，例如：

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

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

  public void doSomething() {
    logger.info("Doing something...");
    // ...
  }
}