1.38 日志的记录

# logger
# 打印debug及其以上级别的日志
logging.level.com.cjh.community=debug
#logging.file=d:/work/data/nowcoder/community.log

@RunWith(SpringRunner.class)
@SpringBootTest
@ContextConfiguration(classes = CommunityApplication.class)
public class LoggerTests {

    private static final Logger logger = LoggerFactory.getLogger(LoggerTests.class);

    @Test
    public void testLogger() {
        //名字就是上面属性，填的LoggerTests.class
        System.out.println(logger.getName());
        //springboot已经集成了，直接在application配置就行，但是之能做简单的配置。
        //想要各个级别分别保存，并且每个文件规定大小。需要在xml配置
        //这样就能使用日志了。比如在try catch中，捕获了异常就能记录日志。
        logger.debug("debug log");
        logger.info("info log");
        logger.warn("warn log");
        logger.error("error log");
    }

}

上面只能配置建的日志。下面可以复杂的：

下面的xml文件，必须放在resource下，名字为logback-spring.xml才能被springboot自动识别。

<?xml version="1.0" encoding="UTF-8"?>
<configuration>
    <contextName>community</contextName>
    <!--存放路径-->
    <property name="LOG_PATH" value="D:/work/data"/>
    <!--上面路径下，再来个目录-->
    <property name="APPDIR" value="community"/>

    <!-- error file -->
    <appender name="FILE_ERROR" class="ch.qos.logback.core.rolling.RollingFileAppender">
        <file>${LOG_PATH}/${APPDIR}/log_error.log</file>
        <!--滚动策略-->
        <rollingPolicy class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy">
            <fileNamePattern>${LOG_PATH}/${APPDIR}/error/log-error-%d{yyyy-MM-dd}.%i.log</fileNamePattern>
            <timeBasedFileNamingAndTriggeringPolicy class="ch.qos.logback.core.rolling.SizeAndTimeBasedFNATP">
                <!--最大存5m，不行在存个行的 %i序号会累加-->
                <maxFileSize>5MB</maxFileSize>
            </timeBasedFileNamingAndTriggeringPolicy>
            <!--最长存30天-->
            <maxHistory>30</maxHistory>
        </rollingPolicy>
        <!--以追加的形式，不是覆盖-->
        <append>true</append>
        <encoder class="ch.qos.logback.classic.encoder.PatternLayoutEncoder">
            <!--表示打印格式 %d表示日期，日志等级，哪个线程执行的，哪个类中打印的日志，具体文件和行号，详细消息和换行-->
            <pattern>%d %level [%thread] %logger{10} [%file:%line] %msg%n</pattern>
            <charset>utf-8</charset>
        </encoder>
        <!--过滤，要error。匹配到了就accept，否则就拒绝deny-->
        <filter class="ch.qos.logback.classic.filter.LevelFilter">
            <level>error</level>
            <onMatch>ACCEPT</onMatch>
            <onMismatch>DENY</onMismatch>
        </filter>
    </appender>

    <!-- warn file -->
    <appender name="FILE_WARN" class="ch.qos.logback.core.rolling.RollingFileAppender">
        <file>${LOG_PATH}/${APPDIR}/log_warn.log</file>
        <rollingPolicy class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy">
            <fileNamePattern>${LOG_PATH}/${APPDIR}/warn/log-warn-%d{yyyy-MM-dd}.%i.log</fileNamePattern>
            <timeBasedFileNamingAndTriggeringPolicy class="ch.qos.logback.core.rolling.SizeAndTimeBasedFNATP">
                <maxFileSize>5MB</maxFileSize>
            </timeBasedFileNamingAndTriggeringPolicy>
            <maxHistory>30</maxHistory>
        </rollingPolicy>
        <append>true</append>
        <encoder class="ch.qos.logback.classic.encoder.PatternLayoutEncoder">
            <pattern>%d %level [%thread] %logger{10} [%file:%line] %msg%n</pattern>
            <charset>utf-8</charset>
        </encoder>
        <filter class="ch.qos.logback.classic.filter.LevelFilter">
            <level>warn</level>
            <onMatch>ACCEPT</onMatch>
            <onMismatch>DENY</onMismatch>
        </filter>
    </appender>

    <!-- info file -->
    <appender name="FILE_INFO" class="ch.qos.logback.core.rolling.RollingFileAppender">
        <file>${LOG_PATH}/${APPDIR}/log_info.log</file>
        <rollingPolicy class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy">
            <fileNamePattern>${LOG_PATH}/${APPDIR}/info/log-info-%d{yyyy-MM-dd}.%i.log</fileNamePattern>
            <timeBasedFileNamingAndTriggeringPolicy class="ch.qos.logback.core.rolling.SizeAndTimeBasedFNATP">
                <maxFileSize>5MB</maxFileSize>
            </timeBasedFileNamingAndTriggeringPolicy>
            <maxHistory>30</maxHistory>
        </rollingPolicy>
        <append>true</append>
        <encoder class="ch.qos.logback.classic.encoder.PatternLayoutEncoder">
            <pattern>%d %level [%thread] %logger{10} [%file:%line] %msg%n</pattern>
            <charset>utf-8</charset>
        </encoder>
        <filter class="ch.qos.logback.classic.filter.LevelFilter">
            <level>info</level>
            <onMatch>ACCEPT</onMatch>
            <onMismatch>DENY</onMismatch>
        </filter>
    </appender>

    <!-- console 把日志打印到控制台，debug及其以上。方便调试-->
    <appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
        <encoder>
            <pattern>%d %level [%thread] %logger{10} [%file:%line] %msg%n</pattern>
            <charset>utf-8</charset>
        </encoder>
        <filter class="ch.qos.logback.classic.filter.ThresholdFilter">
            <level>debug</level>
        </filter>
    </appender>

    <!--单独声明，community包下的日志级别debug-->
    <logger name="com.cjh.community" level="debug"/>
    <!--项目根目录默认info级别，由于根下好多jar包，debug会打印好多日志-->
    <root level="info">
        <!--启动下面的组件，上面单独声明的组件，不会存文件，会打印到控制台-->
        <appender-ref ref="FILE_ERROR"/>
        <appender-ref ref="FILE_WARN"/>
        <appender-ref ref="FILE_INFO"/>
        <appender-ref ref="STDOUT"/>
    </root>

</configuration>