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通過擴(kuò)展logback日志來發(fā)送異常信息郵件

系統(tǒng)異常了，上篇是通過在全局異常中通過調(diào)用發(fā)送郵件的處理器代碼進(jìn)行郵件的發(fā)送，總是覺得還不那么優(yōu)雅

這篇是通過擴(kuò)展 logback 的日志插件來處理 err 級(jí)別的日志異常信息來發(fā)送郵件的

通過這篇的學(xué)習(xí)，可以掌握如何擴(kuò)展 logback 的日志類，來實(shí)現(xiàn)自己不可告人的目的

下面直接上代碼

首先自定義一個(gè)日志處理處理類 wlcLogLogbackAppender

import ch.qos.logback.classic.spi.LoggingEvent;
import ch.qos.logback.classic.spi.ThrowableProxy;
import ch.qos.logback.core.AppenderBase;
import com.handler.WlcAsyncHandler;
import com.utils.SpringContextUtil;
import org.springframework.web.context.request.RequestContextHolder;
import org.springframework.web.context.request.ServletRequestAttributes;
import javax.servlet.http.HttpServletRequest;
import java.util.Objects;

/**
* 描述: 自定義日志處理類 <br>
* 時(shí)間: 2021-07-01 11:11 <br>
* 作者：IT學(xué)習(xí)道場(chǎng)
*/
public class wlcLogLogbackAppender extends AppenderBase<LoggingEvent> {

    @Override
    protected void append(LoggingEvent eventObject) {
        if(eventObject instanceof LoggingEvent){
            LoggingEvent loggingEvent = (LoggingEvent)eventObject;
            //拿到ThrowableProxy
            ThrowableProxy throwableProxy = (ThrowableProxy) loggingEvent.getThrowableProxy();
            if (Objects.nonNull(throwableProxy)) {
                //獲取 throwable 頂級(jí)異常
                Throwable throwable = throwableProxy.getThrowable();
                //獲取log的msg
                String formattedMessage = loggingEvent.getFormattedMessage();
                //獲取請(qǐng)求request
                HttpServletRequest request = ((ServletRequestAttributes) RequestContextHolder
                        .getRequestAttributes()).getRequest();
                //獲取spring的spring.mail.enable屬性值，下面的邏輯你也可以自己根據(jù)想法自己玩也行
                String mailEnableProperty = SpringContextUtil.getEnvironmentProperty("spring.mail.enable");
                mailEnableProperty = (mailEnableProperty == null) ? "false" : mailEnableProperty;
                boolean mailEnable = Boolean.valueOf(mailEnableProperty);
                if (mailEnable){
                    //獲取郵件的處理類
                    WlcAsyncHandler emailHandler = SpringContextUtil.getBean(WlcAsyncHandler.class);
                    emailHandler.handle(formattedMessage, throwable, request);
                }

            }
        }
        super.doAppend(eventObject);
    }

}
自定義的日志處理類搞完了，剩下的就是在logback-spring.xml中配置下就行，配置級(jí)別是 error 級(jí)別

<?xml version="1.0" encoding="UTF-8"?>
<configuration>
    
    <property name="PATH" value="./log"></property>

    <appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
        <encoder>
            
            <Pattern>%d{ss.SSS} %highlight(%-5level) %blue(%-30logger{30}:%-4line) %thread %green(%-18X{LOG_ID}) %msg%n</Pattern>
        </encoder>
    </appender>

    <appender name="TRACE_FILE" class="ch.qos.logback.core.rolling.RollingFileAppender">
        <file>${PATH}/trace/trace.log</file>
        <rollingPolicy class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy">
            <FileNamePattern>${PATH}/trace/trace.%d{yyyy-MM-dd}.%i.log</FileNamePattern>
            <timeBasedFileNamingAndTriggeringPolicy class="ch.qos.logback.core.rolling.SizeAndTimeBasedFNATP">
                <maxFileSize>10MB</maxFileSize>
            </timeBasedFileNamingAndTriggeringPolicy>
            
            <cleanHistoryOnStart>true</cleanHistoryOnStart>
            
            <maxHistory>15</maxHistory>
        </rollingPolicy>
        <layout>
            <pattern>%d{yyyy-MM-dd HH:mm:ss.SSS} %-5level %-50logger{50}:%-4line %green(%-18X{LOG_ID}) %msg%n</pattern>
        </layout>
    </appender>

    <appender name="ERROR_FILE" class="ch.qos.logback.core.rolling.RollingFileAppender">
        <file>${PATH}/error/error.log</file>
        <rollingPolicy class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy">
            <FileNamePattern>${PATH}/error/error.%d{yyyy-MM-dd}.%i.log</FileNamePattern>
            <timeBasedFileNamingAndTriggeringPolicy class="ch.qos.logback.core.rolling.SizeAndTimeBasedFNATP">
                <maxFileSize>10MB</maxFileSize>
            </timeBasedFileNamingAndTriggeringPolicy>
            <cleanHistoryOnStart>true</cleanHistoryOnStart>
            <maxHistory>15</maxHistory>
        </rollingPolicy>
        <layout>
            <pattern>%d{yyyy-MM-dd HH:mm:ss.SSS} %-5level %-50logger{50}:%-4line %green(%-18X{LOG_ID}) %msg%n</pattern>
        </layout>
        <filter class="ch.qos.logback.classic.filter.LevelFilter">
            <level>ERROR</level>
            <onMatch>ACCEPT</onMatch>
            <onMismatch>DENY</onMismatch>
        </filter>
    </appender>

<appender name="WlcLog" class="com.logback.wlcLogLogbackAppender">
        <filter class="ch.qos.logback.classic.filter.LevelFilter">
            <level>ERROR</level>
            <onMatch>ACCEPT</onMatch>
            <onMismatch>DENY</onMismatch>
        </filter>
    </appender>


    
    <root level="ERROR">
        <appender-ref ref="ERROR_FILE" />
        <appender-ref ref="WlcLog" />
    </root>

    <root level="TRACE">
        <appender-ref ref="TRACE_FILE" />
    </root>

    <root level="INFO">
        <appender-ref ref="STDOUT" />
    </root>
</configuration>

當(dāng)然由于

判斷了異常不為空時(shí)，想要進(jìn)去判斷，就需要在log輸出日志時(shí)，要注入 Throwable

如下

必須用 log.error("這是一個(gè)日志msg", e);

這樣

ThrowableProxy throwableProxy = (ThrowableProxy) loggingEvent.getThrowableProxy();
throwableProxy 就不等于 null

像 log.error("這是一個(gè)日志msg");

throwableProxy 就等于 null

這樣自定義一個(gè)日志處理處理類 wlcLogLogbackAppender 就生效了

你可以 wlcLogLogbackAppender 在里面你可以拿到日志信息，做一些自己想做的事情。比如我這邊就是在里面發(fā)送郵件，當(dāng)然你可以做任何事

發(fā)郵件的代碼就不分享了，有興趣的可以去看上一篇文章。

作者：IT學(xué)習(xí)道場(chǎng)

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