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

public class HelloWorld {
  public static void main(String[] args) {
    Logger logger = LoggerFactory.getLogger(HelloWorld.class);
    logger.info("Hello World");
  }
}

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import org.junit.Test;
import org.junit.runner.RunWith;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.test.context.junit4.SpringRunner;

@RunWith(SpringRunner.class)
@SpringBootTest
public class LogbackTest {
	//记录器
	Logger logger = LoggerFactory.getLogger(getClass());
	
	@Test
	public void logTest() {
		//日志的级别
		//从上到下---由低到高
		//日志会在设置的级别和高级别生效，Spring Boot默认info
		logger.trace("这是trace日志...");
		logger.debug("这是debug日志...");
		//可以在logback-spring.xml或者在application.xml配置日志级别
		logger.info("这是info日志...");
		logger.warn("这是warn日志...");
		logger.error("这是error日志...");
	}
}

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<?xml version="1.0" encoding="UTF-8"?>
<configuration debug="false" scan="true" scanPeriod="60 seconds">
   
	<!--定义日志文件的存储地址 勿在 LogBack 的配置中使用相对路径 -->
	<!-- 
	<property name="LOG_PATH" value="/data/log/process/springboot-demo" />
	 -->
	<springProperty name="LOG_PATH" source="logging.path"  defaultValue="../logs" />
	<!-- 控制台输出 -->
	<appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
		<encoder class="ch.qos.logback.classic.encoder.PatternLayoutEncoder">
			<!--格式化输出：%d表示日期，%thread表示线程名，%-5level：级别从左显示5个字符宽度%msg：日志消息，%n是换行符 -->
			<pattern>%d{yyyy-MM-dd HH:mm:ss.SSS} [%thread] %-5level %logger{50} - %msg%n</pattern>
		</encoder>
	</appender>
	
	<!-- 按照每天生成日志文件 -->
	<appender name="FILE" class="ch.qos.logback.core.rolling.RollingFileAppender">
		<rollingPolicy class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy">
			<!--日志文件输出的文件名 -->
			<FileNamePattern>${LOG_PATH}/log.log.%d{yyyy-MM-dd}</FileNamePattern>
			<!--日志文件保留天数 -->
			<!-- <MaxHistory>30</MaxHistory> -->
		</rollingPolicy>
		<encoder class="ch.qos.logback.classic.encoder.PatternLayoutEncoder">
			<!--格式化输出：%d表示日期，%thread表示线程名，%-5level：级别从左显示5个字符宽度%msg：日志消息，%n是换行符 -->
			<pattern>%d{yyyy-MM-dd HH:mm:ss.SSS} [%thread] %-5level %logger{50} - %msg%n</pattern>
		</encoder>
	</appender>

	<!-- 日志输出级别 -->
	<root level="INFO">
		<appender-ref ref="FILE" />
		<appender-ref ref="STDOUT" />
	</root>
</configuration>  

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#log
logging.config=classpath:logback-spring.xml
logging.path=D:/log