springboot slf4j+log4j日志使用

使用slf4j作为日志门面调用log4j

1. 安装依赖 情况1：若pom包含了springboot启动依赖，只需要引入lombok依赖，该方法不需要去配置log4j.properties文件

<dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
        </dependency>

情况2：手动引入slf4j和log4j的依赖，需要配置log4j.properties

<dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
        </dependency>
        <dependency>
            <groupId>org.slf4j</groupId>
            <artifactId>slf4j-api</artifactId>
            <version>1.7.22</version>
        </dependency>
        <dependency>
            <groupId>log4j</groupId>
            <artifactId>log4j</artifactId>
            <version>1.2.17</version>

配置log4j.properties

log4j.rootLogger=INFO,CONSOLE
log4j.appender.CONSOLE=org.apache.log4j.ConsoleAppender
log4j.appender.CONSOLE.layout=org.apache.log4j.PatternLayout

2. 在控制台输出日志信息

注意在类前面加入注解@Slf4j

@Slf4j
public class Application {

    public static void main(String[] args) {
        log.info("hello world!");
    }
}