【校园商铺 3章】：logback.xml的配置和使用

1. 引入jar包

<!-- 1.日志 -->
<!-- 实现slf4j接口并整合 -->
<!-- https://mvnrepository.com/artifact/org.slf4j/slf4j-api -->
<dependency>
   <groupId>org.slf4j</groupId>
   <artifactId>slf4j-api</artifactId>
   <version>1.7.26</version>
</dependency>

<dependency>
	<groupId>ch.qos.logback</groupId>
	<artifactId>logback-classic</artifactId>
	<version>1.2.3</version>
</dependency>

2. logback.xml配置文件

<?xml version="1.0" encoding="utf-8"?>

<!-- 日志级别从低到高分为TRACE < DEBUG < INFO < WARN < ERROR < FATAL，如果设置为WARN，则低于WARN的信息都不会输出 -->
<!-- scan:当此属性设置为true时，配置文件如果发生改变，将会被重新加载，默认值为true -->
<!-- scanPeriod:设置监测配置文件是否有修改的时间间隔，如果没有给出时间单位，默认单位是毫秒。当scan为true时，此属性生效。默认的时间间隔为1分钟。 -->
<!-- debug:当此属性设置为true时，将打印出logback内部日志信息，实时查看logback运行状态。默认值为false。 -->

<configuration scan="true" scanPeriod="60 seconds" debug="false">

    <!-- 定义参数常量 -->
    <property name="log.level" value="debug" />
    <property name="log.maxHistory" value="30" /><!--日志保存30天，31天重新计数，前面删除-->
    <!--<property name="log.filePath" value="C:/logs/log"/>-->
    <property name="log.filePath" value="${catalina.base}/logs/webapps"/><!--日志的存放目录-->
    <!--以什么格式输出-->
    <property name="log.pattern" value="%d{yyyy-MM-dd HH:mm:ss.SSS}[%thread]%-5level %logger{50} - %msg%n" />

    <!-- 输出到控制台 -->
    <appender  name="consoleAppender" class="ch.qos.logback.core.ConsoleAppender">
        <encoder>
            <pattern>
                ${log.pattern}
            </pattern>
        </encoder>
    </appender>

    <!--输出到文件-->

    <!-- debug级别 -->
    <appender name="debugAppender" class="ch.qos.logback.core.rolling.RollingFileAppender">
        <file>${log.filePath}/debug.log</file>
        <rollingPolicy class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy">
            <!-- 文件名称 -->
            <fileNamePattern>${log.filePath}/debug/debug.%d{yyyy-MM-dd}.log.gz</fileNamePattern>
            <!-- 文件最大保存的历史数量 -->
            <maxHistory>${log.maxHistory}</maxHistory>
        </rollingPolicy>
        <encoder>
            <pattern>${log.pattern}</pattern>
        </encoder>
        <filter class="ch.qos.logback.classic.filter.LevelFilter">
            <level>DEBUG</level>
            <onMatch>ACCEPT</onMatch>
            <onMisMatch>DENY</onMisMatch>
        </filter>
    </appender>

    <!-- ERROR级别 -->
    <appender name="errorAppender" class="ch.qos.logback.core.rolling.RollingFileAppender">
        <file>${log.filePath}/error.log</file>
        <rollingPolicy class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy">
            <!-- 文件名称 -->
            <fileNamePattern>${log.filePath}/error/error.%d{yyyy-MM-dd}.log.gz
            </fileNamePattern>
            <!-- 文件最大保存的历史数量 -->
            <maxHistory>${log.maxHistory}</maxHistory>
        </rollingPolicy>
        <encoder>
            <pattern>${log.pattern}</pattern>
        </encoder>
        <filter class="ch.qos.logback.classic.filter.LevelFilter">
            <level>ERROR</level>
            <onMatch>ACCEPT</onMatch>
            <onMisMatch>DENY</onMisMatch>
        </filter>
    </appender>

    <!-- info级别 -->
    <appender name="infoAppender" class="ch.qos.logback.core.rolling.RollingFileAppender">
        <file>${log.filePath}/info.log</file>
        <rollingPolicy class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy">
            <!-- 文件名称 -->
            <fileNamePattern>${log.filePath}/info/info.%d{yyyy-MM-dd}.log.gz
            </fileNamePattern>
            <!-- 文件最大保存的数量 -->
            <maxHistory>${log.maxHistory}</maxHistory>
        </rollingPolicy>
        <encoder>
            <pattern>${log.pattern}</pattern>
        </encoder>
        <filter class="ch.qos.logback.classic.filter.LevelFilter">
            <level>INFO</level>
            <onMatch>ACCEPT</onMatch>
            <onMisMatch>DENY</onMisMatch>
        </filter>
    </appender>

    <root level="info">
        <appender-ref  ref="consoleAppender"/>
    </root>
    <logger name="com.imooc.o2o" level="${log.level}" additivity="true">
        <appender-ref ref="debugAppender"/>
        <appender-ref ref="infoAppender"/>
        <appender-ref ref="errorAppender"/>
    </logger>
</configuration>

3. 验证配置

/**表现层Controller*/
@Controller
@RequestMapping("/superadmin")
public class AreaController {
    Logger logger= LoggerFactory.getLogger(AreaController.class);
    @Autowired
    private AreaService areaService;
    @RequestMapping(value = "/listarea",method = RequestMethod.GET)
    @ResponseBody //将modelMap对象以JSON格式返回给前端
    private Map<String,Object> listArea(){
        logger.info("===start===");
        long startTime=System.currentTimeMillis();
        Map<String,Object> modelMap=new HashMap<String, Object>();
        List<Area> list=new ArrayList<Area>();
        try {
            list=areaService.getAreaList();
            modelMap.put("rows",list);
            modelMap.put("total",list.size());
        } catch (Exception e) {
            e.printStackTrace();
            modelMap.put("success",false);
            modelMap.put("errMsg",e.toString());
        }
        logger.error("test error!");
        long endTime=System.currentTimeMillis();
        logger.debug("costTime[{}ms]",endTime-startTime);
        logger.info("===end===");
        return modelMap;
    }
}

找到日志存放的目录：
< property name=“log.filePath” value="${catalina.base}/logs/webapps"/>

控制台输出：

每天以压缩包形式存储

< fileNamePattern>${log.filePath}/error/error.%d{yyyy-MM-dd}.log.gz < /fileNamePattern>