根据业务归类log文件

当业务比较复杂的时候，会希望按照业务来归类log文件，而不是放到一个文件里。

比如说，我希望按照cotroller单位去划分log文件，并且设定每个log文件的size是10MB，那么可以做一下设置。

<?xml version="1.0" encoding="UTF-8"?>
<configuration>
	<include resource="org/springframework/boot/logging/logback/base.xml" />
    <appender name="SIFT" class="ch.qos.logback.classic.sift.SiftingAppender">
        <discriminator class="ch.qos.logback.classic.sift.MDCBasedDiscriminator">
            <key>funcid</key>
            <defaultValue>all</defaultValue>
        </discriminator>
        <sift>
            <appender name="debug-${funcid}" class="ch.qos.logback.core.rolling.RollingFileAppender">
            	<encoder>
					<pattern>${FILE_LOG_PATTERN}</pattern>
				</encoder>
                <file>d:/debug-${funcid}.log</file>
				<rollingPolicy class="ch.qos.logback.core.rolling.FixedWindowRollingPolicy">
					<fileNamePattern>d:/debug-${funcid}.log.%i</fileNamePattern>
				</rollingPolicy>
				<triggeringPolicy class="ch.qos.logback.core.rolling.SizeBasedTriggeringPolicy">
					<MaxFileSize>10MB</MaxFileSize>
				</triggeringPolicy>
            </appender>
        </sift>
    </appender>
    <logger name="jp.co.abc.controller" level="debug">
    	<appender-ref ref="SIFT" />
    </logger>
</configuration>

 这样，我们可以在出力log的时候，设定funcid来决定，log出力到哪个file里。

每次设置肯定会比较繁琐，我们可以在HandlerInterceptor里来设定funcid，这样就不用每次出力log时都设定funcid了。

public class LogConfigInterceptor extends HandlerInterceptorAdapter {
	@Override
	public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler)
			throws Exception {
		if(handler instanceof HandlerMethod){
			HandlerMethod hm = (HandlerMethod)handler;
			MDC.put("funcid", hm.getBeanType().getSimpleName());
		}
		return true;
	}
	@Override
	public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex)
			throws Exception {
		// TODO Auto-generated method stub
		MDC.remove("funcid");
	}
}

 然后在WebMvcConfigurer把这个HandlerInterceptor注册上就好了

@Component
public class MvcConfigurer extends WebMvcConfigurerAdapter {
	@Override
	public void addInterceptors(InterceptorRegistry registry) {
		registry.addInterceptor(new LogConfigInterceptor()).addPathPatterns("/**").excludePathPatterns("/static/**");
	}
}