SpringBoot学习(1) - 日志

 1 package com.study.spring_boot_log;
 2
 3 import org.springframework.boot.SpringApplication;
 4 import org.springframework.boot.autoconfigure.SpringBootApplication;
 5 import org.springframework.boot.autoconfigure.websocket.WebSocketAutoConfiguration;
 6 import org.springframework.context.ConfigurableApplicationContext;
 7
 8 import com.study.spring_boot_log.dao.UserDao;
 9 import com.study.spring_boot_log.service.UserService;
36 @SpringBootApplication(exclude=WebSocketAutoConfiguration.class)
37 public class App {
38     public static void main(String[] args) {
39         ConfigurableApplicationContext context = SpringApplication.run(App.class,args);
40         context.getBean(UserDao.class).log();
41         System.out.println("===================");
42         context.getBean(UserService.class).log();
43
44         context.close();
45     }
46 }

pom.xml:

 1 <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 2     xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
 3     <modelVersion>4.0.0</modelVersion>
 4
 5     <groupId>com.study.springboot</groupId>
 6     <artifactId>spring-boot-log</artifactId>
 7     <version>1.0.0</version>
 8     <packaging>jar</packaging>
 9
10     <name>spring-boot-log</name>
11     <url>http://maven.apache.org</url>
12
13     <properties>
14         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
15     </properties>
16
17     <dependencyManagement>
18         <dependencies>
19             <dependency>
20                 <groupId>org.springframework.boot</groupId>
21                 <artifactId>spring-boot-dependencies</artifactId>
22                 <version>1.5.3.RELEASE</version>
23                 <scope>import</scope>
24                 <type>pom</type>
25             </dependency>
26         </dependencies>
27     </dependencyManagement>
28
29     <dependencies>
30         <dependency>
31             <groupId>org.springframework.boot</groupId>
32             <artifactId>spring-boot-starter</artifactId>
33         </dependency>
34     </dependencies>
35 </project>

 1 package com.study.spring_boot_log.dao;
 2
 3 import org.slf4j.Logger;
 4 import org.slf4j.LoggerFactory;
 5 import org.springframework.stereotype.Component;
 6
 7 @Component
 8 public class UserDao {
 9     private Logger log = LoggerFactory.getLogger(UserDao.class);
10     public void log() {
11         log.debug("user dao debug log");
12         log.info("user dao info log");
13         log.warn("user dao warn log");
14         log.error("user dao error log");
15     }
16 }

 1 package com.study.spring_boot_log.service;
 2
 3 import org.slf4j.Logger;
 4 import org.slf4j.LoggerFactory;
 5 import org.springframework.stereotype.Component;
 6
 7 @Component
 8 public class UserService {
 9     private Logger log = LoggerFactory.getLogger(UserService.class);
10     public void log() {
11         log.debug("user service debug log");
12         log.info("user service info log");
13         log.warn("user service warn log");
14         log.error("user service error log");
15     }
16 }

springboot默认 的日志级别是info
可以通过logging.level.*=debug配置项设置，*可以是包，也可以是某个类。

也可以在Run Configurations中配置 --debug，或者SpringApplication.run(App.class,“--debug=true”)。这两种debug只会是springboot默认，自定义的类不会debug。

日志级别有：TRACE,DEBUG,INFO,WARN,ERROR,FATA,OFF
日志级别配置成OFF，表示关闭日志输出

logging.file 指定日志文件路径名字
logging.path 指定日志目录(此时的日志名字为spring.log)
日志文件输出，文件的大小10M之后，就会分割

logging.pattern.console 配置控制台输出日志的pattern
logging.file.console 配置日志文件输出日志的pattern

application.properties

1 logging.level.com.study.spring_boot_log.dao.UserDao=off
2 logging.level.com.study.spring_boot_log.service.UserService=DEBUG
3
4 logging.file=D:/ivy/mylog
5 logging.path=D:/ivy/mylogs
6
7 logging.pattern.console=%-20(%d{yyyy-MM-dd} [%thread]) %-5level %logger{80} - %msg%n
8 logging.file.console=%-20(%d{yyyy-MM-dd HH:mm:ss.SSS} [%thread]) %-5level %logger{80} - %msg%n

springboot 默认支持logback
也就是说，只需要在classpath下放一个logback.xml，logback-spring.xml的文件，即可定制日志的输出

logback-spring.xml或logback.xml：

 1 <?xml version="1.0" encoding="UTF-8"?>
 2 <configuration>
 3   <appender name="consoleLog" class="ch.qos.logback.core.ConsoleAppender">
 4     <layout class="ch.qos.logback.classic.PatternLayout">
 5       <pattern>%-20(%d{yyyy-MM-dd HH:mm:ss.SSS} [%thread]) %-5level %logger{80} - %msg%n</pattern>
 6     </layout>
 7   </appender>
 8
 9
10   <root level="debug">
11     <appender-ref ref="consoleLog" />
12   </root>
13 </configuration>

使用其他的日志组件的步骤：
1.排除默认的日志组件：spring-boot-starter-logging
2.加入新的日志路径依赖
3.把相应的配置文件放在classpath下

log4j2.xml：

 1 <?xml version="1.0" encoding="UTF-8"?>
 2 <configuration>
 3     <appenders>
 4         <Console name="console" target="SYSTEM_OUT" follow="true">
 5           <PatternLayout pattern="%d{yyyy-MM-dd} [%thread] %-5level %logger{80} - %msg%n"/>
 6         </Console>
 7    </appenders>
 8    <loggers>
 9     <root level="DEBUG">
10       <appender-ref ref="console"/>
11     </root>
12   </loggers>
13 </configuration>