spring boot log 配置

​ 使用log4j2

Q1:过滤掉系统日志？？

<loggers>
       <!-- 过滤掉org.springframework包下面的日志-->
  			<!-- name对应代码的包 additivity设置为false表示不会到root的log里面 -->
       <logger name="org.springframework" level="INFO" additivity="false">
       </logger>
       <root level="INFO">
           <appender-ref ref="Console"/>
           <appender-ref ref="RollingFileInfo"/>
           <appender-ref ref="RollingFileWarn"/>
           <appender-ref ref="RollingFileError"/>
       </root>
   </loggers>

Q2: 不同级别的日志输出到不同的文件？？

https://github.com/bycuimiao/springboot2-log4j2-demo/blob/master/src/main/resources/log4j2.xml

<RollingFile name="RollingFileInfo" fileName="${FILE_PATH}/info.log"
             filePattern="${FILE_PATH}/${FILE_NAME}-INFO-%d{yyyy-MM-dd}_%i.log.gz">
  <Filters>
    <!-- 表示对于warn以及warn级别以上的日志 deny，对于warn一下子的日志不拦截 -->
    <ThresholdFilter level="WARN" onMatch="DENY" onMismatch="NEUTRAL"/>
    <!-- 表示info以及以上的日志接受，以下的deny掉 （因为info的以上的日志都被上面的filter过滤掉了，所以只有info的日志可以通过这两个filter）-->
    <ThresholdFilter level="INFO" onMatch="ACCEPT" onMismatch="DENY"/>
  </Filters>
  <PatternLayout pattern="${LOG_PATTERN}"/>
  <Policies>
    <SizeBasedTriggeringPolicy size="1M"/>
  </Policies>
</RollingFile>
<RollingFile name="RollingFileWarn" fileName="${FILE_PATH}/warn.log"
             filePattern="${FILE_PATH}/${FILE_NAME}-WARN-%d{yyyy-MM-dd}_%i.log.gz">
  <Filters>
    <ThresholdFilter level="ERROR" onMatch="DENY" onMismatch="NEUTRAL"/>
    <ThresholdFilter level="WARN" onMatch="ACCEPT" onMismatch="DENY"/>
  </Filters>
  <PatternLayout pattern="${LOG_PATTERN}"/>
  <Policies>
    <SizeBasedTriggeringPolicy size="1M"/>
  </Policies>
</RollingFile>
<RollingFile name="RollingFileError" fileName="${FILE_PATH}/error.log"
             filePattern="${FILE_PATH}/${FILE_NAME}-ERROR-%d{yyyy-MM-dd}_%i.log.gz">
  <ThresholdFilter level="ERROR" onMatch="ACCEPT" onMismatch="DENY"/>
  <PatternLayout pattern="${LOG_PATTERN}"/>
  <Policies>
    <SizeBasedTriggeringPolicy size="1M"/>
  </Policies>
</RollingFile>

Q3:不同环境日志文件位置问题？？

对于日志的位置，不能使用绝对路径，原因是多人开发，每个人机器上的路径不一致，这个时候可以使用

<property name="FILE_PATH" value="${sys:user.home}/home/logs"/>

${sys:user.home}表示用户的目录，cd ～

在docker容器中对应/root 目录

Q4:日志打印

利用servelet拦截器

https://www.jianshu.com/p/afdd31bfbf94

package com.lingshiedu.lszy.filter

import org.slf4j.LoggerFactory
import org.slf4j.MDC
import org.springframework.stereotype.Component
import org.springframework.web.util.ContentCachingRequestWrapper
import org.springframework.web.util.ContentCachingResponseWrapper
import org.springframework.web.util.WebUtils
import java.io.UnsupportedEncodingException
import java.nio.charset.Charset
import java.util.*
import javax.servlet.*
import javax.servlet.http.HttpServletRequest
import javax.servlet.http.HttpServletResponse

@Component
class LogFilter : Filter {
    val Logger = LoggerFactory.getLogger(LogFilter::class.java)
    val SPLIT_STRING_M = "="
    val SPLIT_STRING_DOT = ", "
    override fun destroy() {
    }

    override fun doFilter(req: ServletRequest?, res: ServletResponse?, filterChain: FilterChain?) {
        val request = req as HttpServletRequest
        val response = res as HttpServletResponse
        MDC.clear()
        //给本次请求分配一个唯一的tradeId
        MDC.put("trade_id", UUID.randomUUID().toString().replace("-", ""))

        val wrapperRequest = ContentCachingRequestWrapper(request)
        val wrapperResponse = ContentCachingResponseWrapper(response)

        Logger.info("method[{}] | queryUrl[{}] | headers[{}] | queryParams[{}] | body:{}", request.method, request.requestURL, getHeaders(req), getRequestParams(request), getRequestBody(wrapperRequest))
        filterChain!!.doFilter(wrapperRequest, wrapperResponse)
        Logger.info("resp body:{}", getResponseBody(wrapperResponse))

        wrapperResponse.copyBodyToResponse()
    }

    private fun getRequestBody(request: ContentCachingRequestWrapper): String? {
        val wrapper = WebUtils.getNativeRequest(request, ContentCachingRequestWrapper::class.java)
        if (wrapper != null) {
            val buf = wrapper.contentAsByteArray
            if (buf.isNotEmpty()) {
                val payload: String = try {
                    String(buf, 0, buf.size, Charset.forName(wrapper.characterEncoding))
                } catch (e: UnsupportedEncodingException) {
                    "[unknown]"
                }

                return payload.replace("\\n".toRegex(), "")
            }
        }

        return ""
    }

    private fun getHeaders(req: HttpServletRequest): String? {
        var header = ""
        for (key in req.headerNames) {
            val value = req.getHeader(key)
            header += " [key:${key} value:${value}] "
        }

        return header
    }

    private fun getResponseBody(response: ContentCachingResponseWrapper): String? {
        val wrapper = WebUtils.getNativeResponse(response, ContentCachingResponseWrapper::class.java)
        if (wrapper != null) {
            val buf = wrapper.contentAsByteArray
            if (buf.isNotEmpty()) {
                val payload: String = try {
                    String(buf, 0, buf.size, Charset.forName(wrapper.characterEncoding))
                } catch (e: UnsupportedEncodingException) {
                    "[unknown]"
                }

                return payload
            }
        }

        return ""
    }

    fun getRequestParams(request: HttpServletRequest): String? {
        val sb = StringBuilder()
        val enu = request.parameterNames
        //获取请求参数
        while (enu.hasMoreElements()) {
            val name = enu.nextElement()
            sb.append(name + SPLIT_STRING_M).append(request.getParameter(name))
            if (enu.hasMoreElements()) {
                sb.append(SPLIT_STRING_DOT)
            }
        }

        return sb.toString()
    }

    override fun init(p0: FilterConfig?) {
    }
}