你是否因为项目出现问题，查找日志文件定位错误花费N多时间，是否为此苦不堪言，没关系！现在通过这篇文章，将彻底解决你的烦恼，这篇文篇介绍，如何通过logback配置文件将日志进行分级打印，一个配置文件彻底搞定日志查找得烦恼。
准备工作环境：
windows jdk 8 maven 3.0 IDEA构建工程
4.0.0
cn.zhangbox
spring-boot-study
1.0-SNAPSHOT
cn.zhangbox
spring-boot-log
0.0.1-SNAPSHOT
jar
spring-boot-logging
Demo project for Spring Boot
UTF-8
UTF-8
1.8
org.springframework.boot
spring-boot-starter-web
org.springframework.boot
spring-boot-starter-test
test
org.springframework.boot
spring-boot-maven-plugin
#选择哪一个环境的配置
#这里可以在每个环境配置redis，数据库（mysql），消息（kafka）等相关的组件的配置
spring:
profiles:
active: dev
#文档块区分为三个---
---
server:
port: 8081
spring:
profiles: dev
#日志
logging:
#日志配置文件位置
config: classpath:log/logback.xml
#日志打印位置，这里是默认在项目根路径下
path: log/spring-boot-log
#文档块区分为三个---
---
server:
port: 8082
spring:
profiles: test
#日志
logging:
#日志配置文件位置
config: classpath:log/logback.xml
#日志打印位置，这里是默认在项目根路径下
path: usr/spring-boot/log/spring-boot-log
#文档块区分为三个---
---
server:
port: 8083
spring:
profiles: prod
#日志
logging:
#日志配置文件位置
config: classpath:log/logback.xml
#日志打印位置，这里是默认在项目根路径下
path: usr/spring-boot/log/spring-boot-log
在工程resources文件夹下新建文件夹log，并在该文件夹下创建logback.xml文件,加入以下配置：
${CONSOLE_LOG_PATTERN}
UTF-8
debug
${LOG_PATH}/log_debug.log
%d{yyyy-MM-dd HH:mm:ss.SSS} [%thread] %-5level %logger{50} - %msg%n
UTF-8
${LOG_PATH}/debug/log-debug-%d{yyyy-MM-dd}.%i.log
500MB
30
debug
ACCEPT
DENY
${LOG_PATH}/log_info.log
%d{yyyy-MM-dd HH:mm:ss.SSS} [%thread] %-5level %logger{50} - %msg%n
UTF-8
${LOG_PATH}/info/log-info-%d{yyyy-MM-dd}.%i.log
500MB
30
info
ACCEPT
DENY
${LOG_PATH}/log_warn.log
%d{yyyy-MM-dd HH:mm:ss.SSS} [%thread] %-5level %logger{50} - %msg%n
UTF-8
${LOG_PATH}/warn/log-warn-%d{yyyy-MM-dd}.%i.log
500MB
30
warn
ACCEPT
DENY
${LOG_PATH}/log_error.log
%d{yyyy-MM-dd HH:mm:ss.SSS} [%thread] %-5level %logger{50} - %msg%n
UTF-8
${LOG_PATH}/error/log-error-%d{yyyy-MM-dd}.%i.log
500MB
30
error
ACCEPT
DENY
注意：loback配置文件中
name的属性值一定要是当前工程的java代码的完整目录,因为mybatis打印的日志级别是debug级别的，因此需要配置debug级别日志扫描的目录。
创建启动类@SpringBootApplication
public class SpringBootConfigApplication {
public static void main(String[] args) {
SpringApplication.run(SpringBootConfigApplication.class, args);
}
}
. ____ _ __ _ _
/\ / ___'_ __ _ _(_)_ __ __ _
( ( )___ | '_ | '_| | '_ / _` |
\/ ___)| |_)| | | | | || (_| | ) ) ) )
' |____| .__|_| |_|_| |___, | / / / /
=========|_|==============|___/=/_/_/_/
:: Spring Boot :: (v1.5.3.RELEASE)
2018-07-05 15:05:13.680 INFO 15060 --- [ main] c.z.s.SpringBootLoggingApplication: Starting SpringBootLoggingApplication on MS-20180428GSYE with PID 15060 (started by Administrator in D:开源项目spring-boot-study)
2018-07-05 15:05:13.685 DEBUG 15060 --- [ main] c.z.s.SpringBootLoggingApplication: Running with Spring Boot v1.5.3.RELEASE, Spring v4.3.8.RELEASE
2018-07-05 15:05:13.686 INFO 15060 --- [ main] c.z.s.SpringBootLoggingApplication: The following profiles are active: dev
2018-07-05 15:05:13.766 INFO 15060 --- [ main] ationConfigEmbeddedWebApplicationContext : Refreshing org.springframework.boot.context.embedded.AnnotationConfigEmbeddedWebApplicationContext@79d94571: startup date [Thu Jul 05 15:05:13 GMT+08:00 2018]; root of context hierarchy
2018-07-05 15:05:14.223 INFO 15060 --- [kground-preinit] o.h.validator.internal.util.Version : HV000001: Hibernate Validator 5.3.5.Final
2018-07-05 15:05:15.550 INFO 15060 --- [ main] s.b.c.e.t.TomcatEmbeddedServletContainer : Tomcat initialized with port(s): 8081 (http)
2018-07-05 15:05:15.563 INFO 15060 --- [ main] o.apache.catalina.core.StandardService : Starting service Tomcat
2018-07-05 15:05:15.565 INFO 15060 --- [ main] org.apache.catalina.core.StandardEngine : Starting Servlet Engine: Apache Tomcat/8.5.14
2018-07-05 15:05:15.703 INFO 15060 --- [ost-startStop-1] o.a.c.c.C.[Tomcat].[localhost].[/]: Initializing Spring embedded WebApplicationContext
2018-07-05 15:05:15.704 INFO 15060 --- [ost-startStop-1] o.s.web.context.ContextLoader : Root WebApplicationContext: initialization completed in 1938 ms
2018-07-05 15:05:15.869 INFO 15060 --- [ost-startStop-1] o.s.b.w.servlet.ServletRegistrationBean : Mapping servlet: 'dispatcherServlet' to [/]
2018-07-05 15:05:15.876 INFO 15060 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean : Mapping filter: 'characterEncodingFilter' to: [favicon.ico] onto handler of type [class org.springframework.web.servlet.resource.ResourceHttpRequestHandler]
2018-07-05 15:05:16.616 INFO 15060 --- [ main] o.s.j.e.a.AnnotationMBeanExporter : Registering beans for JMX exposure on startup
2018-07-05 15:05:16.636 INFO 15060 --- [ main] o.a.coyote.http11.Http11NioProtocol : Initializing ProtocolHandler ["http-nio-8081"]
2018-07-05 15:05:16.645 INFO 15060 --- [ main] o.a.coyote.http11.Http11NioProtocol : Starting ProtocolHandler ["http-nio-8081"]
2018-07-05 15:05:16.659 INFO 15060 --- [ main] o.a.tomcat.util.net.NioSelectorPool : Using a shared selector for servlet write/read
2018-07-05 15:05:16.679 INFO 15060 --- [ main] s.b.c.e.t.TomcatEmbeddedServletContainer : Tomcat started on port(s): 8081 (http)
2018-07-05 15:05:16.685 INFO 15060 --- [ main] c.z.s.SpringBootLoggingApplication: Started SpringBootLoggingApplication in 4.291 seconds (JVM running for 5.767)
这里因为logback配置中将不同级别的日志设置了在不同文件中打印，这样很大程度上方便项目出问题查找问题。
源码地址Spring Boot日志组件logback实现日志分级打印源码
