SpringBoot logging日志

- 日理万妓 2022-12-29 09:55 178阅读 0赞

# SpringBoot logging日志 #

SpringBoot：底层是Spring框架，Spring框架默认是用JCL；‘

**SpringBoot选用 SLF4j和logback；**

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");
      }
    }

## 切换日志框架 ##

可以按照slf4j的日志适配图，进行相关的切换；

slf4j+log4j的方式；

pom.xml

<dependency>
      <groupId>org.springframework.boot</groupId>
      <artifactId>spring-boot-starter-web</artifactId>
      <exclusions>
        <exclusion>
          <artifactId>logback-classic</artifactId>
          <groupId>ch.qos.logback</groupId>
        </exclusion>
        <exclusion>
          <artifactId>log4j-over-slf4j</artifactId>
          <groupId>org.slf4j</groupId>
        </exclusion>
      </exclusions>
    </dependency>
    
    <dependency>
      <groupId>org.slf4j</groupId>
      <artifactId>slf4j-log4j12</artifactId>
    </dependency>

<parent>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-parent</artifactId>
            <version>1.5.10.RELEASE</version>
            <relativePath/> 
        </parent>
    
        <properties>
            <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
            <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
            <java.version>1.8</java.version>
        </properties>
    
    
    
    	//切换为log4j2
    
        <dependencies>
            <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
            <exclusions>
                <exclusion>
                        <artifactId>spring-boot-starter-logging</artifactId>
                        <groupId>org.springframework.boot</groupId>
                    </exclusion>
                </exclusions>
            </dependency>
    
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-starter-log4j2</artifactId>
            </dependency>
            
            
            
    
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-starter-test</artifactId>
                <scope>test</scope>
            </dependency>
        </dependencies>
    
        <build>
            <plugins>
                <plugin>
                    <groupId>org.springframework.boot</groupId>
                    <artifactId>spring-boot-maven-plugin</artifactId>
                </plugin>
            </plugins>
        </build>
    
    
    </project>

## test ##

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 SpringBoot03LoggingApplicationTests { 
    
       //记录器
       Logger logger = LoggerFactory.getLogger(getClass());
       @Test
       public void contextLoads() { 
          //System.out.println();
    
          //日志的级别；
          //由低到高 trace<debug<info<warn<error
          //可以调整输出的日志级别；日志就只会在这个级别以以后的高级别生效
          logger.trace("这是trace日志...");
          logger.debug("这是debug日志...");
          //SpringBoot默认给我们使用的是info级别的，没有指定级别的就用SpringBoot默认规定的级别；root级别
          logger.info("这是info日志...");
          logger.warn("这是warn日志...");
          logger.error("这是error日志...");
       }
    }

## application.properties ##

#logging.path=
    # 不指定路径在当前项目下生成springboot.log日志
    # 可以指定完整的路径；
    #logging.file=G:/springboot.log
    # 在当前磁盘的根路径下创建spring文件夹和里面的log文件夹；使用?spring.log 作为默认文件
    logging.path=/spring/log
    
    #  在控制台输出的日志的格式
    logging.pattern.console=%d{yyyy-MM-dd} [%thread] %-5level %logger{50} - %msg%n
    # 指定文件中日志输出的格式
    logging.pattern.file=%d{yyyy-MM-dd} === [%thread] === %-5level === %logger{50} ==== %msg%n

## log4j.properties ##

### set log levels ###
    log4j.rootLogger = debug ,  stdout ,  D ,  E
    
    ### 输出到控制台 ###
    log4j.appender.stdout = org.apache.log4j.ConsoleAppender
    log4j.appender.stdout.Target = System.out
    log4j.appender.stdout.layout = org.apache.log4j.PatternLayout
    log4j.appender.stdout.layout.ConversionPattern =  %d{ABSOLUTE} ===== %5p %c{ 1 }:%L - %m%n
    
    #### 输出到日志文件 ###
    #log4j.appender.D = org.apache.log4j.DailyRollingFileAppender
    #log4j.appender.D.File = logs/log.log
    #log4j.appender.D.Append = true
    #log4j.appender.D.Threshold = DEBUG ## 输出DEBUG级别以上的日志
    #log4j.appender.D.layout = org.apache.log4j.PatternLayout
    #log4j.appender.D.layout.ConversionPattern = %-d{yyyy-MM-dd HH:mm:ss}  [ %t:%r ] - [ %p ]  %m%n
    #
    #### 保存异常信息到单独文件 ###
    #log4j.appender.D = org.apache.log4j.DailyRollingFileAppender
    #log4j.appender.D.File = logs/error.log ## 异常日志文件名
    #log4j.appender.D.Append = true
    #log4j.appender.D.Threshold = ERROR ## 只输出ERROR级别以上的日志!!!
    #log4j.appender.D.layout = org.apache.log4j.PatternLayout
    #log4j.appender.D.layout.ConversionPattern = %-d{yyyy-MM-dd HH:mm:ss}  [ %t:%r ] - [ %p ]  %m%n