SpringBoot整合Log4j

1、依赖

<!-- spring boot start -->
<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter</artifactId>
    <exclusions>
        <!-- 排除自带的logback依赖 -->
        <exclusion>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-logging</artifactId>
        </exclusion>
    </exclusions>
</dependency>

<!-- springboot-log4j -->
<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-log4j</artifactId>
    <version>1.3.8.RELEASE</version>
</dependency>

2、Log4j配置文件(建立在和application文件同级的目录下)

# Log4j配置
log4j.rootCategory=INFO,stdout
#控制台输出
log4j.appender.stdout=org.apache.log4j.ConsoleAppender
log4j.appender.stdout.layout=org.apache.log4j.PatternLayout
log4j.appender.stdout.layout.ConversionPattern=%d{yyyy-MM-dd-HH-mm} [%t] [%c] [%p] - %m%n

注：该文件里的stdout全部替换成CONSOLE也是没有问题的。当然你也可以在文件中配置file,error,debug等其他的日志信息。

3、使用Log4j

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

/**
 * @author EchoDemo
 * @ClassName cn.aduu.web.HelloController
 * @Description
 */
@RestController
public class HelloController{

    private static final Logger logger = LoggerFactory.getLogger(HelloController.class);

    @RequestMapping("hello")
    public String hello() throws JsonProcessingException {
        logger.info("Hello World！");
        return "hello world";
    }
}

注：启动之后在浏览器访问就好了。

4、日志打印效果

十一月 20, 2018 10:42:10 下午 org.apache.catalina.core.ApplicationContext log
2018-11-20-22-42 [http-nio-8080-exec-1] [org.springframework.web.servlet.DispatcherServlet] [INFO] - FrameworkServlet 'dispatcherServlet': initialization started
信息: Initializing Spring FrameworkServlet 'dispatcherServlet'
2018-11-20-22-42 [http-nio-8080-exec-1] [org.springframework.web.servlet.DispatcherServlet] [INFO] - FrameworkServlet 'dispatcherServlet': initialization completed in 23 ms
2018-11-20-22-42 [http-nio-8080-exec-1] [com.echodemo.girl.web.UserController] [INFO] - Hello World!