四.Spring boot日志介绍

摘要：不过官网推荐使用的方式，因为可以使用高级特性动态使用日志配置。测试控制台输出指定环境

spring框架默认选择的是JCL

spring boot框架默认选择的是SLF4j + Logback

案例:

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");
  }
}

第一步:排除其他日志框架

第二步:使用中间包替换原有日志包

第三步:导入slf4j实现包

    org.springframework.boot
    spring-boot-starter-web



    org.springframework.boot
    spring-boot-starter



    org.springframework.boot
    spring-boot-starter-logging

排除spring 使用的commons-logging

    org.springframework
    spring-core
    
        
            commons-logging
            commons-logging
        
    

spring boot默认级别为info

@RunWith(SpringRunner.class)
@SpringBootTest
public class ApplicationTests {
private Logger logger = LoggerFactory.getLogger(ApplicationTests.class);
@Test
public void logTest() {
    logger.trace("--This is trace log");
    logger.debug("-- --This is debug log");
    logger.info("-- -- --This is info log");
    logger.warn("-- -- -- --This is warn log");
    logger.error("-- -- -- -- --This is error log");
    }
}

运行结果:
: -- -- --This is info log
: -- -- -- --This is warn log
: -- -- -- -- --This is error log

简单配置案例

#设置日志有颜色的输出
spring:
  output:
    ansi:
      enabled: always
#日志配置
logging:
  #日志级别设置
  level:
    #指定包生效
    com.lvmama: debug
  #日志文件路径(当前工程根目录下spring.log)
  path: /log/springboot

spring boot 其他日志配置

logging.file
logging.file.max-size
logging.file.max-history
logging.path
logging.pattern.console
logging.pattern.dateformat
logging.pattern.file
logging.pattern.level
PID

When possible, we recommend that you use the -spring variants for your logging configuration (for example, logback-spring.xml rather than logback.xml). If you use standard configuration locations, Spring cannot completely control log initialization.

在resource目录下添加指定的log.xml，spring boot默认只用自定义的日志配置,如logback在resource目录下添加logback.xml或logback-spring.xml即可。不过官网推荐使用logback-spring的方式，因为可以使用高级特性,动态使用日志配置。

Because the standard logback.xml configuration file is loaded too early, you cannot use extensions in it. You need to either use logback-spring.xmlor define a logging.config property.

测试:

        
            
                %d{yyyy-MM-dd HH:mm:ss.SSS} ---dev--- [%thread] - %-5level %logger{50} - %msg%n
            
            
                %d{yyyy-MM-dd HH:mm:ss.SSS} - [%thread] - %-5level %logger{50} - %msg%n
            
        
    
    

mvn spring-boot:run

控制台输出:

2018-05-20 17:55:44.708 - [main] - INFO  com.lvmama.SpringBootInstaller - Starting SpringBootInstaller on 28H5EO7ZV2V7ELK with PID 4288 (D:workspacespring-boot	argetclasses started by Administrator in D:workspacespring-boot)
2018-05-20 17:55:44.732 - [main] - DEBUG com.lvmama.SpringBootInstaller - Running with Spring Boot v1.5.14.BUILD-SNAPSHOT, Spring v4.3.17.RELEASE
2018-05-20 17:55:44.733 - [main] - INFO  com.lvmama.SpringBootInstaller - No active profile set, falling back to default profiles: default
2018-05-20 17:55:45.224 - [background-preinit] - INFO  org.hibernate.validator.internal.util.Version - HV000001: Hibernate Validator 5.3.6.Final
2018-05-20 17:55:48.158 - [main] - INFO  org.apache.coyote.http11.Http11NioProtocol - Initializing ProtocolHandler ["http-nio-8080"]
2018-05-20 17:55:48.236 - [main] - INFO  org.apache.catalina.core.StandardService - Starting service [Tomcat]

mvn spring-boot:run -Drun.profiles=dev //指定dev环境 ​

2018-05-20 17:59:25.500 ---dev--- [main] - INFO  com.lvmama.SpringBootInstaller - Starting SpringBootInstaller on 28H5EO7ZV2V7ELK with PID 2880 (D:workspacespring-boot	argetclasses started by Administrator in D:workspacespring-boot)
2018-05-20 17:59:25.505 ---dev--- [main] - DEBUG com.lvmama.SpringBootInstaller - Running with Spring Boot v1.5.14.BUILD-SNAPSHOT, Spring v4.3.17.RELEASE
2018-05-20 17:59:25.506 ---dev--- [main] - INFO  com.lvmama.SpringBootInstaller - The following profiles are active: dev
2018-05-20 17:59:26.007 ---dev--- [background-preinit] - INFO  org.hibernate.validator.internal.util.Version - HV000001: Hibernate Validator 5.3.6.Final
2018-05-20 17:59:27.749 ---dev--- [main] - INFO  org.apache.coyote.http11.Http11NioProtocol - Initializing ProtocolHandler ["http-nio-8080"]
2018-05-20 17:59:27.769 ---dev--- [main] - INFO  org.apache.catalina.core.StandardService - Starting service [Tomcat]