[Java] 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>

trace<debug<info<warn<error

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");
 }
 
}

2018-11-09 00:13:36.899  info 8156 --- [main] com.example.demo.demoapplicationtests  : info日志
2018-11-09 00:13:36.900  warn 8156 --- [main] com.example.demo.demoapplicationtests  : warn日志
2018-11-09 00:13:36.900 error 8156 --- [main] com.example.demo.demoapplicationtests  : 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