如何将不同业务模块产生的日志 分多文件记录

在项目中如果把所有的日志都记到一个 info.log 分析起来会很麻烦，中间夹着不同业务产生的日志，所以我们需要将不同的业务日志拆分到不同的文件中，便于日志分析。

一般日志文件的命名为：xxx.info.log 、xxx.error.log，如下图

 一般 error 的日志我们重点关注。如果业务日志文件多了，找起来比较麻烦（当然也可以用 搜索 *.error.log）

我们在项目中会将 error 放在开头（也可以按文件夹来划分，比如将 api 建成一个文件夹）这样查找起来比较方便，如下图

在logback.xmp中，根据业务合理分析定义日志文件保存规则

然后再按 领域、业务，命名业务日志文件，如不同厂家的接口，可以命名为：api_厂商_业务_info.log ，

---

 以下基于 LogBack 日志类实现的demo ， LogBack 是 log4j 的升级版， 基于 slf4j 的实现，（log4j、slf4j、logback  是同一作者）

log4j2 是Apache 的产品，和 log4j 不是一个人写的。名字有点坑

代码如下

LogTests.java

package com.iron.demo;

import com.iron.demo.utility.LogFileName;
import com.iron.demo.utility.LoggerUtils;
import org.junit.jupiter.api.Test;
import org.slf4j.Logger;
import org.springframework.boot.test.context.SpringBootTest;


@SpringBootTest
class LogTests {

    Logger LOG_API_HIS_PRESCRIPTION = LoggerUtils.Logger(LogFileName.LOG_API_HIS_PRESCRIPTION);
    Logger LOG_API_IRON_PRESCRIPTION = LoggerUtils.Logger(LogFileName.LOG_API_IRON_PRESCRIPTION);

    @Test
    public void testBusinessLog() throws Exception {
        LOG_API_HIS_PRESCRIPTION.info("HIS 接口产生的相关日志...");
        for (int i = 0; i < 5; i++) {
            LOG_API_IRON_PRESCRIPTION.info("Iron 设备相关的业务日志..."+i);
        }
        LOG_API_HIS_PRESCRIPTION.error("HIS 接口产生的【错误】日志...");
        LOG_API_IRON_PRESCRIPTION.error("Iron 接口产生的【错误】日志...");
    }
}

LogFileName.java

package com.iron.demo.utility;

public enum LogFileName {

    //配置到logback.xml中的logger name="apiHis"
    LOG_API_HIS_PRESCRIPTION("apiHis"),
    LOG_API_IRON_PRESCRIPTION("apiIron");

    private String logFileName;

    LogFileName(String fileName) {
        this.logFileName = fileName;
    }

    public String getLogFileName() {
        return logFileName;
    }

    public void setLogFileName(String logFileName) {
        this.logFileName = logFileName;
    }

    public static LogFileName getAwardTypeEnum(String value) {
        LogFileName[] arr = values();
        for (LogFileName item : arr) {
            if (null != item && item.logFileName == null && !(item.logFileName.trim().isEmpty())) {
                return item;
            }
        }
        return null;
    }
}

LoggerUtils.java

package com.iron.demo.utility;

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

public class LoggerUtils {
    /**
     * 传统默认的记录方式
     * @param clazz
     * @param <T>
     * @return
     */
    public static <T> Logger Logger(Class<T> clazz) {
        return LoggerFactory.getLogger(clazz);
    }

    /**
     * 记录到指定的文件下
     *
     * @param desc 日志文件名称
     * @return
     */
    public static Logger Logger(LogFileName desc) {
        return LoggerFactory.getLogger(desc.getLogFileName());
    }
}

logback.xml

<?xml version="1.0" encoding="UTF-8"?>
<configuration>

    <appender name="CONSOLE" class="ch.qos.logback.core.ConsoleAppender">
        <encoder charset="UTF-8">
            <pattern>[%d{yyyy-MM-dd HH:mm:ss.SSS}] %level [%thread] %file:%line - %msg%n</pattern>
            <charset>UTF-8</charset>
        </encoder>
    </appender>

    <appender name="SYS_INFO" class="ch.qos.logback.core.rolling.RollingFileAppender">
        <File>${catalina.base}/logs/info.log</File>
        <append>true</append>
        <!--过滤器,只打INFO级别的日志，日志文件最多保留15天（如果是按天滚动）-->
        <filter class="ch.qos.logback.classic.filter.LevelFilter">
            <level>INFO</level>
            <onMatch>ACCEPT</onMatch>
            <onMismatch>DENY</onMismatch>
        </filter>
        <rollingPolicy class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy">
            <fileNamePattern>${catalina.base}/logs/info.log.%d{yyyy-MM-dd}</fileNamePattern>
            <maxHistory>15</maxHistory>
        </rollingPolicy>

        <encoder charset="UTF-8">
            <pattern>[%d{yyyy-MM-dd HH:mm:ss.SSS}] %level [%thread] %file:%line - %msg%n</pattern>
            <charset>UTF-8</charset>
        </encoder>
    </appender>

    <appender name="SYS_ERROR" class="ch.qos.logback.core.rolling.RollingFileAppender">
        <File>${catalina.base}/logs/error.log</File>
        <append>true</append>
        <!--过滤器,只打ERROR级别的日志-->
        <filter class="ch.qos.logback.classic.filter.LevelFilter">
            <level>ERROR</level>
            <onMatch>ACCEPT</onMatch>
            <onMismatch>DENY</onMismatch>
        </filter>
        <rollingPolicy class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy">
            <fileNamePattern>${catalina.base}/logs/error.log.%d{yyyy-MM-dd}</fileNamePattern>
            <maxHistory>15</maxHistory>
        </rollingPolicy>

        <encoder charset="UTF-8">
            <pattern>[%d{yyyy-MM-dd HH:mm:ss.SSS}] %level [%thread] %file:%line - %msg%n</pattern>
            <charset>UTF-8</charset>
        </encoder>
    </appender>

    <!--不同业务产生的日志打印到不同文件中-->
    <appender name="API_HIS_INFO" class="ch.qos.logback.core.rolling.RollingFileAppender">
        <File>${catalina.base}/logs/api_his_info.log</File>
        <append>true</append>
        <filter class="ch.qos.logback.classic.filter.LevelFilter">
            <level>INFO</level>
            <onMatch>ACCEPT</onMatch>
            <onMismatch>DENY</onMismatch>
        </filter>
        <rollingPolicy class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy">
            <fileNamePattern>${catalina.base}/logs/api_his_info.log.%d{yyyy-MM-dd}</fileNamePattern>
            <maxHistory>15</maxHistory>
        </rollingPolicy>
        <encoder charset="UTF-8">
            <pattern>[%d{yyyy-MM-dd HH:mm:ss.SSS}] %level [%thread] %file:%line - %msg%n</pattern>
            <charset>UTF-8</charset>
        </encoder>
    </appender>
    <appender name="API_HIS_ERROR" class="ch.qos.logback.core.rolling.RollingFileAppender">
        <File>${catalina.base}/logs/error_api_his.log</File>
        <append>true</append>
        <filter class="ch.qos.logback.classic.filter.LevelFilter">
            <level>ERROR</level>
            <onMatch>ACCEPT</onMatch>
            <onMismatch>DENY</onMismatch>
        </filter>
        <rollingPolicy class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy">
            <fileNamePattern>${catalina.base}/logs/error_api_his.log.%d{yyyy-MM-dd}</fileNamePattern>
            <maxHistory>15</maxHistory>
        </rollingPolicy>
        <encoder charset="UTF-8">
            <pattern>[%d{yyyy-MM-dd HH:mm:ss.SSS}] %level [%thread] %file:%line - %msg%n</pattern>
            <charset>UTF-8</charset>
        </encoder>
    </appender>

    <appender name="API_IRON_INFO" class="ch.qos.logback.core.rolling.RollingFileAppender">
        <File>${catalina.base}/logs/api_iron_info.log</File>
        <append>true</append>
        <filter class="ch.qos.logback.classic.filter.LevelFilter">
            <level>INFO</level>
            <onMatch>ACCEPT</onMatch>
            <onMismatch>DENY</onMismatch>
        </filter>
        <rollingPolicy class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy">
            <fileNamePattern>${catalina.base}/logs/api_iron_info.log.%d{yyyy-MM-dd}</fileNamePattern>
            <maxHistory>15</maxHistory>
        </rollingPolicy>
        <encoder charset="UTF-8">
            <pattern>[%d{yyyy-MM-dd HH:mm:ss.SSS}] %level [%thread] %file:%line - %msg%n</pattern>
            <charset>UTF-8</charset>
        </encoder>
    </appender>
    <appender name="API_IRON_ERROR" class="ch.qos.logback.core.rolling.RollingFileAppender">
        <File>${catalina.base}/logs/error_api_iron.log</File>
        <append>true</append>
        <filter class="ch.qos.logback.classic.filter.LevelFilter">
            <level>ERROR</level>
            <onMatch>ACCEPT</onMatch>
            <onMismatch>DENY</onMismatch>
        </filter>
        <rollingPolicy class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy">
            <fileNamePattern>${catalina.base}/logs/error_api_iron.log.%d{yyyy-MM-dd}</fileNamePattern>
            <maxHistory>15</maxHistory>
        </rollingPolicy>
        <encoder charset="UTF-8">
            <pattern>[%d{yyyy-MM-dd HH:mm:ss.SSS}] %level [%thread] %file:%line - %msg%n</pattern>
            <charset>UTF-8</charset>
        </encoder>
    </appender>

    <!--设置 com.iron.demo 包空间下面的日志 level 显示-->
    <logger name="com.iron.demo" level="INFO"/>


    <!-- 不同的业务逻辑日志打印到指定文件中 && info 和 error 分开-->
    <logger name="apiHis" additivity="false" level="INFO">
        <appender-ref ref="API_HIS_INFO"/>
        <appender-ref ref="API_HIS_ERROR"/>
    </logger>
    <logger name="apiIron" additivity="false" level="INFO">
        <!--打到控制台-->
        <appender-ref ref="CONSOLE"/>
        <appender-ref ref="API_IRON_INFO"/>
        <appender-ref ref="API_IRON_ERROR"/>
    </logger>

    <!--系统级的日志(默认） info和error分开打印-->
    <root level="INFO">
        <appender-ref ref="CONSOLE"/>
        <appender-ref ref="SYS_INFO"/>
        <appender-ref ref="SYS_ERROR"/>
    </root>

</configuration>