先说一下场景，app接入网宿，通过打印请求响应日志，看看是不是有效果，哈哈哈哈哈哈。

于是乎，加了请求日志，加了响应日志，请求和响应都加了时间戳。因为app处于一个起步阶段，即便是生产环境其实也有很多日志。以前的老大设计了单独的日志，比如支付的单独一套日志，响应也会有单独的一套日志。还是很感谢以前的老大的设计。我也试试吧。

spring boot + slf4j

打印请求响应日志，加了个切面，具体的代码就不说了，往上一堆一堆的。只介绍日志如何单独打印。

首先看slf4j配置

<?xml version="1.0" encoding="UTF-8"?>
<configuration scan="true" scanPeriod="60 seconds">
        <include resource="org/springframework/boot/logging/logback/base.xml" />
        <appender name="FILE" class="ch.qos.logback.core.rolling.RollingFileAppender">
                <filter class="ch.qos.logback.classic.filter.LevelFilter">
                        <level>ERROR</level>   <!--过滤掉error的级别-->
                        <onMatch>DENY</onMatch>
                        <onMismatch>ACCEPT</onMismatch>
                </filter>
                <file>/server/tomcat8-server/logs/maker.log</file>
                <rollingPolicy class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy">
                        <fileNamePattern>/server/tomcat8-server/logs/maker.%d{yyyy-MM-dd}.log</fileNamePattern>
                </rollingPolicy>
                <encoder>
                        <pattern>[%-5level] [%d{yyyy-MM-dd HH:mm:ss.SSS}] %logger:%line : %msg%n</pattern>
                </encoder>
        </appender>
        <logger name="FILELOG" level="info">
                <appender-ref ref="FILE"/>
        </logger>

        <appender name="fileErrorLog" class="ch.qos.logback.core.rolling.RollingFileAppender">
                <!-- 只写入error级别的日志 -->
                <filter class="ch.qos.logback.classic.filter.ThresholdFilter">
                        <level>ERROR</level>
                </filter>
                <file>/server/tomcat8-server/logs/error.log</file>
                <rollingPolicy class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy">
                        <fileNamePattern>/server/tomcat8-server/logs/error.%d{yyyy-MM-dd}.log</fileNamePattern>
                </rollingPolicy>
                <encoder>
                        <pattern>[%-5level] [%d{yyyy-MM-dd HH:mm:ss.SSS}] %logger:%line : %msg%n</pattern>
                </encoder>
        </appender>
        <logger name="ERRORLOG" level="error">
                <appender-ref ref="fileErrorLog"/>
        </logger>

        <appender name="reqresplog" class="ch.qos.logback.core.rolling.RollingFileAppender">
                <file>/server/tomcat8-server/logs/reqresp.log</file>
                <rollingPolicy class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy">
                        <fileNamePattern>/server/tomcat8-server/logs/reqresp.%d{yyyy-MM-dd}.log</fileNamePattern>
                </rollingPolicy>
                <encoder>
                        <pattern>[%-5level] [%d{yyyy-MM-dd HH:mm:ss.SSS}] %logger:%line : %msg%n</pattern>
                </encoder>
        </appender>

        <logger name="reqresp" level="info">
                <appender-ref ref="reqresplog" />
        </logger>

        <root level="INFO">
                <!--<appender-ref ref="CONSOLE"/>-->
                <appender-ref ref="FILE"/>
                <!--<appender-ref ref="dailyRollingFileAppender"/>-->
                <!--<appender-ref ref="Sentry"/>-->
<!--            <appender-ref ref="fileErrorLog"/>-->
        </root>

然后看使用

Logger logger = LoggerFactory.getLogger("reqresp");
log.info("api-request，{}", reqrespJson.toJSONString());

注：应该是要把之前的@Slf4j注掉

servlet+log4j

先看log4j的配置

log4j.rootLogger= debug,stand, NormalLog, ErrorLog
#log4j.rootLogger= fatal

#control log level by package or class
log4j.logger.org.apache.mina=error
log4j.logger.com.mchange=fatal
log4j.logger.org.apache.catalina.startup=error

#NormalLog
log4j.appender.NormalLog=org.apache.log4j.DailyRollingFileAppender
log4j.appender.NormalLog.File=/server/tomcat8-api/logs/maker.log
log4j.appender.NormalLog.DatePattern='.'yyyyMMdd
log4j.appender.NormalLog.Threshold=info
log4j.appender.NormalLog.layout=org.apache.log4j.PatternLayout
log4j.appender.NormalLog.layout.ConversionPattern=%d{MM-dd HH:mm:ss} %5p [%t] (%F:%L) - %m%n

#ErrorLog, only log warning/error/fatal
log4j.appender.ErrorLog=org.apache.log4j.DailyRollingFileAppender
log4j.appender.ErrorLog.File=/server/tomcat8-api/logs/error.log
log4j.appender.ErrorLog.Threshold=error
log4j.appender.ErrorLog.DatePattern='.'yyyyMMdd
log4j.appender.ErrorLog.layout=org.apache.log4j.PatternLayout
log4j.appender.ErrorLog.layout.ConversionPattern=%d{MM-dd HH\:mm\:ss} %5p [%t] (%F\:%L) - %m%n

#log4j.logger.com.live.filter.GlobalFilter=DEBUG, reqrespparam 
#log4j.logger.com.live.api.utils.Tools=DEBUG, reqrespparam    #com.live.filter.GlobalFilter，com.live.api.utils.Tools是要单独输出的类名
#log4j.appender.reqrespparam=org.apache.log4j.DailyRollingFileAppender
#log4j.appender.reqrespparam.Threshold=info
#log4j.appender.reqrespparam.ImmediateFlush=true
#log4j.appender.reqrespparam.Append=true
#log4j.appender.reqrespparam.File=/server/tomcat8-api/logs/reqresp.log
#log4j.appender.reqrespparam..DatePattern='.'yyyyMMdd
#log4j.appender.reqrespparam.layout=org.apache.log4j.PatternLayout
#log4j.appender.reqrespparam.layout.ConversionPattern=%d{MM-dd HH\:mm\:ss} %5p [%t] (%F\:%L) - %m%n

再看使用