logback学习笔记

目的：将项目中的log4j改为logback，并且使用门面日志slf4j进行打印日志。

1.删除log4j的依赖

<dependency>
    <groupId>log4j</groupId>
    <artifactId>log4j</artifactId>
    <version>${log4j_version}</version>
</dependency>
<dependency>
    <groupId>org.slf4j</groupId>
    <artifactId>slf4j-log4j12</artifactId>
    <version>${slf4j_version}</version>
</dependency>

2.添加logback和slf4j的依赖

<dependency>
    <groupId>org.slf4j</groupId>
    <artifactId>slf4j-api</artifactId>
    <version>${slf4j_version}</version>
</dependency>
<dependency>
    <groupId>ch.qos.logback</groupId>
    <artifactId>logback-core</artifactId>
    <version>${logback_version}</version>
</dependency>
<dependency>
    <groupId>ch.qos.logback</groupId>
    <artifactId>logback-classic</artifactId>
    <version>${logback_version}</version>
</dependency>

3.添加logback.xml

在src/main/java/resources下新建logback.xml文件

<?xml version="1.0" encoding="UTF-8"?>
<configuration scan="false" debug="false">
    <appender name="console" class="ch.qos.logback.core.ConsoleAppender">
        <encoder>
            <pattern>
                [%level] [%thread] [%d{yyyy-MM-dd HH:mm:ss.SSS}] [%mdc{traceid}] [%mdc{user_id}] [%logger{0}] [%msg]%n
            </pattern>
        </encoder>
    </appender>
    <appender name="root" class="ch.qos.logback.core.rolling.RollingFileAppender">
        <rollingPolicy class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy">
            <FileNamePattern>${log4j.path}/root.%d{yyyy-MM-dd}.%i.log</FileNamePattern>
            <maxHistory>3000</maxHistory>
            <!-- 按时间回滚的同时，按文件大小来回滚 -->
            <timeBasedFileNamingAndTriggeringPolicy class="ch.qos.logback.core.rolling.SizeAndTimeBasedFNATP">
                <maxFileSize>1GB</maxFileSize>
            </timeBasedFileNamingAndTriggeringPolicy>
        </rollingPolicy>
        <encoder>
            <pattern>
                [%level] [%thread] [%d{yyyy-MM-dd HH:mm:ss.SSS}] [%mdc{traceid}] [%mdc{user_name}] [%mdc{interface}] [%logger{0}] [%msg]%n
            </pattern>
        </encoder>
    </appender>
    <!-- ERROR级别日志单独输出 -->
    <appender name="error" class="ch.qos.logback.core.rolling.RollingFileAppender">
        <rollingPolicy class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy">
            <FileNamePattern>${log4j.path}/error.%d{yyyy-MM-dd}.%i.log</FileNamePattern>
            <maxHistory>3000</maxHistory>
            <!-- 按时间回滚的同时，按文件大小来回滚 -->
            <timeBasedFileNamingAndTriggeringPolicy class="ch.qos.logback.core.rolling.SizeAndTimeBasedFNATP">
                <maxFileSize>1GB</maxFileSize>
            </timeBasedFileNamingAndTriggeringPolicy>
        </rollingPolicy>

        <encoder>
            <pattern>
                [%level] [%thread] [%d{yyyy-MM-dd HH:mm:ss.SSS}] [%mdc{traceid}] [%mdc{user_name}] [%mdc{interface}] [%logger{0}] [%msg]%n
            </pattern>
        </encoder>
        <!-- 对ERROR级别的进行拦截 -->
        <filter class="ch.qos.logback.classic.filter.LevelFilter">
            <level>ERROR</level>
            <onMatch>ACCEPT</onMatch>
            <onMismatch>DENY</onMismatch>
        </filter>
    </appender>
    <!-- 打印SQL日志 -->
    <logger name="com.ibatis" additivity="true">
        <level value="INFO" />
        <appender-ref ref="sql"/>
    </logger>
    <logger name="java.sql.Connection" additivity="true">
        <level value="INFO" />
        <appender-ref ref="sql"/>
    </logger>
        <root level="INFO">
        <appender-ref ref="root"/>
        <!--<appender-ref ref="console"/>-->
    </root>

出现的问题

Q:logback一直不生效
A:通过查看maven依赖树，发现在某个包中含有slf4j-log4j12的依赖，将这个依赖排除后问题解决。