Spring Boot中slf4j日志依赖关系示例详解

<dependency>
 <groupId>org.springframework</groupId>
 <artifactId>spring-core</artifactId>
 <version>4.3.20.RELEASE</version>
 <exclusions>
 <exclusion>
  <artifactId>commons-logging</artifactId>
  <groupId>commons-logging</groupId>
 </exclusion>
 </exclusions>
</dependency>

package com.example.demo;

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 DemoApplicationTests {

 Logger log = LoggerFactory.getLogger(getClass());

 @Test
 public void contextLoads() {
  log.trace("trace日志");
  log.debug("debug日志");
  log.info("info日志");
  log.warn("warn日志");
  log.error("error日志");
 }

}

# 指定日志输入级别
logging.level.com.example.demo=trace 

# 指定日志输出位置和日志文件名
logging.file=./log/log.txt

# 指定日志输出路径,若file和path同时配置,则file生效
# 此配置默认生成文件为spring.log
#logging.path=./log

# 控制台日志输出格式
# -5表示从左显示5个字符宽度
logging.pattern.console=%d{yyyy-MM-dd HH:mm:ss.SSS} %highlight(%-5level) %boldYellow(%thread) | %boldGreen(%logger) | %msg%n

# 文件中输出的格式
logging.pattern.file=%d{yyyy-MM-dd HH:mm:ss.SSS} = [%thread] = %-5level = %logger{50} - %msg%n