Spring boot's correct posture for logging

Previous articles

Spring Boot log processing are you still using Logback?

Brief introduction

The previous article focuses on the configuration of Log4j2, and this article focuses on the application of unified log processing. The following includes HTTP request log processing and Exception exception log processing.

HTTP request log


1. Clear the contents of log records

Example: user, IP address, Method, URI, request parameter, request body

2. Global interception of MDCFilter.java

package com.anoyi.config.server;

import lombok.extern.log4j.Log4j2;
import org.slf4j.MDC;
import org.springframework.http.HttpMethod;
import org.springframework.stereotype.Component;
import org.springframework.web.filter.OncePerRequestFilter;

import javax.servlet.FilterChain;
import javax.servlet.ReadListener;
import javax.servlet.ServletException;
import javax.servlet.ServletInputStream;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletRequestWrapper;
import javax.servlet.http.HttpServletResponse;
import java.io.*;

 * Intercept request information, add to log
public class MDCFilter extends OncePerRequestFilter {

    protected void doFilterInternal(HttpServletRequest request, HttpServletResponse response, FilterChain chain) throws ServletException, IOException {
        try {
            MDC.put("user", request.getRemoteUser());
            String query = request.getQueryString() != null ? "?" + request.getQueryString() : "";
            if (request.getMethod().equals(HttpMethod.POST.name())) {
                MultiReadHttpServletRequest multiReadHttpServletRequest = new MultiReadHttpServletRequest(request);
                log.info("IP:{}, Method:{}, URI:{} Body:{}", request.getRemoteAddr(), request.getMethod(), request.getRequestURI() + query, multiReadHttpServletRequest.getRequestBody());
                chain.doFilter(multiReadHttpServletRequest, response);
            } else {
                log.info("IP:{}, Method:{}, URI:{}", request.getRemoteAddr(), request.getMethod(), request.getRequestURI() + query);
                chain.doFilter(request, response);
        } finally {

     * HttpServletRequest Request body multi read
    class MultiReadHttpServletRequest extends HttpServletRequestWrapper {

        // Cache RequestBody
        private String requestBody;

        MultiReadHttpServletRequest(HttpServletRequest request) {
            requestBody = "";
            try {
                StringBuilder stringBuilder = new StringBuilder();
                InputStream inputStream = request.getInputStream();
                byte[] bs = new byte[1024];
                int len;
                while ((len = inputStream.read(bs)) != -1) {
                    stringBuilder.append(new String(bs, 0, len));
                requestBody = stringBuilder.toString();
            } catch (IOException e) {

        public ServletInputStream getInputStream() throws IOException {
            final ByteArrayInputStream byteArrayInputStream = new ByteArrayInputStream(requestBody.getBytes());

            return new ServletInputStream() {
                public int read() throws IOException {
                    return byteArrayInputStream.read();

                public boolean isFinished() {
                    return byteArrayInputStream.available() == 0;

                public boolean isReady() {
                    return true;

                public void setReadListener(ReadListener readListener) {


        public BufferedReader getReader() throws IOException {
            return new BufferedReader(new InputStreamReader(this.getInputStream()));

        String getRequestBody() {
            return requestBody.replaceAll("\n", "");


3. Configure log Pattern

    console: "%d{yyyy-MM-dd HH:mm:ss.SSS} %5p [%15.15t] %-40.40c{1.} [%X{user}] : %m%n%xwEx"
Description: MDC. Put ("user", request. Getremoteuser()); = >% X {user}

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Tags: Java Spring Lombok log4j

Posted on Sat, 09 Nov 2019 06:01:50 -0800 by burhankhan