SpringBoot 项目

SpringBoot 默认集成了 logback + slf4j，使用 lombok更方便一些

pom.xml

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<dependency>
  <groupId>org.projectlombok</groupId>
  <artifactId>lombok</artifactId>
  <optional>true</optional>
</dependency>

application.yml

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logging:
    level:
        com.bjtcrj.files : debug
    file:
        path: ./log
        name: files.log
        max-history: 100

使用

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@Slf4j

log.info("耗时：" + (System.currentTimeMillis()-start) + "ms");

非 SpringBoot 项目

方案一「推荐」

pom.xml

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<lombok.version>1.18.8</lombok.version>
<logback.version>1.2.3</logback.version>

<!-- lombok 提供了 slf4j 日志门面-->
<dependency>
  <groupId>org.projectlombok</groupId>
  <artifactId>lombok</artifactId>
  <version>${lombok.version}</version>
</dependency>

<!-- logback 日志实现 -->
<dependency>
  <groupId>ch.qos.logback</groupId>
  <artifactId>logback-classic</artifactId>
  <version>${logback.version}</version>
</dependency>
<dependency>
  <groupId>ch.qos.logback</groupId>
  <artifactId>logback-core</artifactId>
  <version>${logback.version}</version>
</dependency>

使用

  1. 所在类加上注解

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    @Slf4j
    public class AccountController {
      //codes
    }

  2. 添加日志代码

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    log.debug("debug");
    log.info("info");
    log.warn("warn");
    log.error("error");

方案二

pom.xml

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<!-- slf4j + logback -->
<!-- slf4j 日志门面 -->
<dependency>
			<groupId>org.slf4j</groupId>
			<artifactId>slf4j-api</artifactId>
			<version>1.8.0-beta2</version>
</dependency>
<!-- logback 日志实现 -->
<dependency>
			<groupId>ch.qos.logback</groupId>
			<artifactId>logback-core</artifactId>
			<version>1.3.0-alpha4</version>
</dependency>
<dependency>
			<groupId>ch.qos.logback</groupId>
			<artifactId>logback-classic</artifactId>
			<version>1.3.0-alpha4</version>
			<exclusions>
				<exclusion>
					<artifactId>slf4j-api</artifactId>
					<groupId>org.slf4j</groupId>
				</exclusion>
			</exclusions>
</dependency>

使用

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import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

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

logger.debug("debug");
logger.info("info");
logger.warn("warn");
logger.error("error");

配置 logback.xml

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<?xml version="1.0" encoding="UTF-8"?>
<configuration>
    <!--定义日志文件的存储地址 勿在 LogBack 的配置中使用相对路径-->  
    <property name="LOG_HOME" value="../logs" />

    <!-- 控制台输出 -->
    <appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
       <!-- 日志输出编码 -->  
       <Encoding>UTF-8</Encoding>   
        <layout class="ch.qos.logback.classic.PatternLayout">   
             <!--格式化输出：%d表示日期，%thread表示线程名，%-5level：级别从左显示5个字符宽度%msg：日志消息，%n是换行符--> 
            <pattern>%d{yyyy-MM-dd HH:mm:ss.SSS} [%thread] %-5level %logger{50} - %msg%n   
            </pattern>   
        </layout>   
    </appender>   

    <!-- 访问日志 appender  -->
    <appender name="DEBUG" class="ch.qos.logback.core.rolling.RollingFileAppender">
        <Encoding>UTF-8</Encoding>
        <rollingPolicy class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy">
            <!-- 按天回滚 daily -->
            <fileNamePattern>${LOG_HOME}/debug-%d{yyyy-MM-dd}.log</fileNamePattern>
            <!-- 日志最大的历史 30天 -->
            <maxHistory>30</maxHistory>
        </rollingPolicy>
        <encoder>
            <pattern>%d{yyyy-MM-dd HH:mm:ss.SSS} [%thread] %-5level %logger - %msg%n</pattern>
        </encoder>
        <!--日志文件最大的大小-->
        <triggeringPolicy class="ch.qos.logback.core.rolling.SizeBasedTriggeringPolicy">
            <MaxFileSize>500MB</MaxFileSize>
        </triggeringPolicy>
    </appender>

    <!-- info日志 appender  -->
    <appender name="INFO" class="ch.qos.logback.core.rolling.RollingFileAppender">
        <Encoding>UTF-8</Encoding>
        <rollingPolicy class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy">
            <!-- 按天回滚 daily -->
            <fileNamePattern>${LOG_HOME}/info-%d{yyyy-MM-dd}.log</fileNamePattern>
            <!-- 日志最大的历史 30天 -->
            <maxHistory>30</maxHistory>
        </rollingPolicy>
        <encoder>
            <pattern>%d{yyyy-MM-dd HH:mm:ss.SSS} [%thread] %-5level %logger - %msg%n</pattern>
        </encoder>
        <filter class="ch.qos.logback.classic.filter.LevelFilter">
            <level>INFO</level>
            <onMatch>ACCEPT</onMatch>
            <onMismatch>DENY</onMismatch>
        </filter>
        <!--日志文件最大的大小-->
        <triggeringPolicy class="ch.qos.logback.core.rolling.SizeBasedTriggeringPolicy">
            <MaxFileSize>100MB</MaxFileSize>
        </triggeringPolicy>
    </appender>

    <!-- warn 日志 appender  -->
    <appender name="WARN" class="ch.qos.logback.core.rolling.RollingFileAppender">
        <Encoding>UTF-8</Encoding>
        <rollingPolicy class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy">
            <!-- 按天回滚 daily -->
            <fileNamePattern>${LOG_HOME}/warn-%d{yyyy-MM-dd}.log</fileNamePattern>
            <!-- 日志最大的历史 30天 -->
            <maxHistory>30</maxHistory>
        </rollingPolicy>
        <encoder>
            <pattern>%d{yyyy-MM-dd HH:mm:ss.SSS} [%thread] %-5level %logger - %msg%n</pattern>
        </encoder>
        <filter class="ch.qos.logback.classic.filter.LevelFilter">
            <level>WARN</level>
            <onMatch>ACCEPT</onMatch>
            <onMismatch>DENY</onMismatch>
        </filter>
        <!--日志文件最大的大小-->
        <triggeringPolicy class="ch.qos.logback.core.rolling.SizeBasedTriggeringPolicy">
            <MaxFileSize>100MB</MaxFileSize>
        </triggeringPolicy>
    </appender>

    <!-- 出错日志 appender  -->
    <appender name="ERROR" class="ch.qos.logback.core.rolling.RollingFileAppender">
        <Encoding>UTF-8</Encoding>
        <rollingPolicy class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy">
            <!-- 按天回滚 daily -->
            <fileNamePattern>${LOG_HOME}/error-%d{yyyy-MM-dd}.log</fileNamePattern>
            <!-- 日志最大的历史 30天 -->
            <maxHistory>30</maxHistory>
        </rollingPolicy>
        <encoder>
            <pattern>%d{yyyy-MM-dd HH:mm:ss.SSS} [%thread] %-5level %logger - %msg%n</pattern>
        </encoder>
        <filter class="ch.qos.logback.classic.filter.LevelFilter"><!-- 只打印错误日志 -->
            <level>ERROR</level>
            <onMatch>ACCEPT</onMatch>
            <onMismatch>DENY</onMismatch>
        </filter>
        <!--日志文件最大的大小-->
        <triggeringPolicy class="ch.qos.logback.core.rolling.SizeBasedTriggeringPolicy">
            <MaxFileSize>100MB</MaxFileSize>
        </triggeringPolicy>
    </appender>

    <!--控制台打印资源加载信息-->
    <!--一般开发或测试环境开启,对应 debug、info 级别 -->
    <root level="info">
        <appender-ref ref="STDOUT" />
    </root>

    <!--日志打印的包的范围，及分类日志文件存储 -->
    <!--一般生产环境开启-->
    <logger name="com.bjtcrj.dealemptytables" level="DEBUG" additivity="false">
        <appender-ref ref="DEBUG"/>
        <appender-ref ref="INFO" />
        <appender-ref ref="WARN"/>
        <appender-ref ref="ERROR"/>
    </logger>

     <!--日志异步到数据库 -->  
    <!-- <appender name="DB" class="ch.qos.logback.classic.db.DBAppender">
        日志异步到数据库 
        <connectionSource class="ch.qos.logback.core.db.DriverManagerConnectionSource">
           连接池 
           <dataSource class="com.mchange.v2.c3p0.ComboPooledDataSource">
              <driverClass>com.mysql.jdbc.Driver</driverClass>
              <url>jdbc:mysql://127.0.0.1:3306/databaseName</url>
              <user>root</user>
              <password>root</password>
            </dataSource>
        </connectionSource>
  </appender> -->
</configuration>