在线上出现问题需要排查，需要开启整个服务的请求与响应日志，下面简介一下如何开启MVC日志： 注1：本文基于 spring-boot-starter-parent 2.3.4.RELEASE 注2：由于站点一般访问量都比较大，影响性能，生产不建议开启，仅在需要问题排查时，通过actuator接口开启，排查完毕要及时关闭。
演示代码参考点这里 1.1、添加logbook引用：
<!-- https://github.com/zalando/logbook --> <dependency> <groupId>org.zalando</groupId> <artifactId>logbook-spring-boot-starter</artifactId> <version>2.3.0</version> </dependency>1.2、在application.yml里添加如下配置：
logging: level: org.zalando.logbook: trace logbook: exclude: # 不记录日志的路径 - "**.html" - "**.htm" - "**.js" - "**.css" - "**.jpg" - "**.ico" - "/static/**"1.3、添加如下代码：
@Bean public HttpLogFormatter httpLogFormatter() { // 使用默认的http日志格式 return new DefaultHttpLogFormatter(); }OK, 启动项目输出日志如下：
2020-10-21 10:23:55.782 TRACE 19096 --- [nio-8080-exec-3] org.zalando.logbook.Logbook : Incoming Request: 976f2e27a4f4e536 Remote: 0:0:0:0:0:0:0:1 POST http://localhost:8080/add HTTP/1.1 accept: application/json, text/plain, */* accept-encoding: gzip, deflate, br accept-language: zh-CN,zh;q=0.9,en;q=0.8 connection: keep-alive content-length: 26 content-type: application/json;charset=UTF-8 cookie: JSESSIONID=9ACD6920FCD4B244C2558610862DF8C7; host: localhost:8080 origin: http://localhost:8080 referer: http://localhost:8080/index.html sec-fetch-dest: empty sec-fetch-mode: cors sec-fetch-site: same-origin user-agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/86.0.4240.75 Safari/537.36 {"id":123,"name":"beinet"} 2020-10-21 10:23:55.840 TRACE 19096 --- [nio-8080-exec-3] org.zalando.logbook.Logbook : Outgoing Response: 976f2e27a4f4e536 Duration: 64 ms HTTP/1.1 200 OK Connection: keep-alive Content-Type: application/json Date: Wed, 21 Oct 2020 02:23:55 GMT Keep-Alive: timeout=60 Transfer-Encoding: chunked {"id":123,"name":"Hello, beinet","time":"2020-10-21T10:23:55.829"}1.1、添加自定义Filter实现代码：
package beinet.cn.web.log; import lombok.extern.slf4j.Slf4j; import org.springframework.stereotype.Component; import org.springframework.util.StringUtils; import org.springframework.web.filter.OncePerRequestFilter; import org.springframework.web.util.ContentCachingRequestWrapper; import org.springframework.web.util.ContentCachingResponseWrapper; import org.springframework.web.util.WebUtils; import javax.servlet.FilterChain; import javax.servlet.ServletException; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import java.io.ByteArrayOutputStream; import java.io.IOException; import java.io.InputStream; import java.io.UnsupportedEncodingException; import java.nio.charset.StandardCharsets; import java.util.Collection; import java.util.Enumeration; import java.util.Objects; import java.util.regex.Matcher; import java.util.regex.Pattern; @Slf4j @Component public class ControllerLogFilter extends OncePerRequestFilter { static Pattern patternRequest = Pattern.compile("(?i)^/actuator/?|\\.(ico|jpg|png|bmp|txt|xml|html?|js|css)$"); @Override protected void doFilterInternal(HttpServletRequest request, HttpServletResponse response, FilterChain filterChain) throws ServletException, IOException { if (!logger.isDebugEnabled() || isNotApiRequest(request)) { filterChain.doFilter(request, response); return; } long startTime = System.currentTimeMillis(); if (!(request instanceof ContentCachingRequestWrapper)) { // 解决 inputStream 只能读取一次的问题 request = new ContentCachingRequestWrapper(request); } if (!(response instanceof ContentCachingResponseWrapper)) { // 同样用于解决 响应只能读取一次的问题，注意要在最后调用 responseWrapper.copyBodyToResponse(); response = new ContentCachingResponseWrapper(response); } Exception exception = null; try { filterChain.doFilter(request, response); } catch (Exception exp) { exception = exp; throw exp; } finally { long latency = System.currentTimeMillis() - startTime; doLog(request, response, latency, exception); repairResponse(response); } } private boolean isNotApiRequest(HttpServletRequest request) { String url = request.getRequestURI(); //request.getRequestURL() 带有域名，所以不用 Matcher matcher = patternRequest.matcher(url); return matcher.find(); } private void doLog(HttpServletRequest request, HttpServletResponse response, long latency, Exception exception) { StringBuilder sb = new StringBuilder(); try { getRequestMsg(request, sb); sb.append("\n--响应 ") .append(response.getStatus()) .append(" 耗时 ") .append(latency) .append("ms"); getResponseMsg(response, sb); if (exception != null) { sb.append("\n--异常 ") .append(exception.getMessage()); } /* // 直接输出到响应流里 try (ServletOutputStream stream = response.getOutputStream()) { stream.write(sb.toString().getBytes(StandardCharsets.UTF_8)); stream.flush(); } */ logger.info(sb.toString()); } catch (Exception exp) { sb.append("\n").append(exp.getMessage()); logger.error(sb.toString()); } } private static void getRequestMsg(HttpServletRequest request, StringBuilder sb) throws IOException { String query = request.getQueryString(); if (!StringUtils.isEmpty(query)) { query = "?" + query; } else { query = ""; } sb.append("\n") .append(request.getMethod()) .append(" ") .append(request.getRequestURL()) .append(query) .append("\n--用户IP: ") .append(request.getRemoteAddr()) .append("\n--请求Header:"); // 读取请求头信息 Enumeration<String> headerNames = request.getHeaderNames(); while (headerNames.hasMoreElements()) { String header = headerNames.nextElement(); Enumeration<String> values = request.getHeaders(header); while (values.hasMoreElements()) { sb.append("\n") .append(header) .append(" : ") .append(values.nextElement()).append("; "); } } // 读取请求体 String requestBody = readFromStream(request.getInputStream()); if (!StringUtils.isEmpty(requestBody)) { sb.append("\n--请求体:\n") .append(requestBody); } } private static void getResponseMsg(HttpServletResponse response, StringBuilder sb) throws UnsupportedEncodingException { sb.append("\n--响应Header: "); for (String header : response.getHeaderNames()) { Collection<String> values = response.getHeaders(header);//.stream().collect(Collectors.joining("; ")); for (String value : values) { sb.append("\n") .append(header) .append(" : ") .append(value); } } // 读取响应体 ContentCachingResponseWrapper wrapper = WebUtils.getNativeResponse(response, ContentCachingResponseWrapper.class); if (wrapper != null) { String responseBody = transferFromByte(wrapper.getContentAsByteArray(), wrapper.getCharacterEncoding()); if (!StringUtils.isEmpty(responseBody)) { sb.append("\n--响应Body:\n") .append(responseBody); } else { sb.append("\n--无响应Body."); } } } private static void repairResponse(HttpServletResponse response) throws IOException { ContentCachingResponseWrapper responseWrapper = WebUtils.getNativeResponse(response, ContentCachingResponseWrapper.class); Objects.requireNonNull(responseWrapper).copyBodyToResponse(); } private static String readFromStream(InputStream stream) throws IOException { ByteArrayOutputStream result = new ByteArrayOutputStream(); byte[] buffer = new byte[1024]; int length; while ((length = stream.read(buffer)) != -1) { result.write(buffer, 0, length); } return result.toString(StandardCharsets.UTF_8.name()); // return new BufferedReader(new InputStreamReader(stream)).lines().collect(Collectors.joining(System.lineSeparator())); } private static String transferFromByte(byte[] arr, String encoding) throws UnsupportedEncodingException { return new String(arr, encoding); } }OK，启动项目，输出日志参考如下：
GET http://localhost:8080/log?id=1234 --用户IP: 0:0:0:0:0:0:0:1 --请求Header: host : localhost:8080; connection : keep-alive; cache-control : max-age=0; upgrade-insecure-requests : 1; user-agent : Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/85.0.4183.121 Safari/537.36 Edg/85.0.564.70; accept : text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,image/apng;q=0.8,application/signed-exchange;v=b3;q=0.9; sec-fetch-site : none; sec-fetch-mode : navigate; sec-fetch-user : ?1; sec-fetch-dest : document; accept-encoding : gzip, deflate, br; accept-language : zh-CN,zh;q=0.9,en;q=0.8,en-GB;q=0.7,en-US;q=0.6,zh-TW;q=0.5,af;q=0.4,mt;q=0.3,cy;q=0.2,fr;q=0.1; cookie : JSESSIONID=FA41080F568C632146F7AB80EE342D5F; BD_CK_SAM=1; --响应 200 耗时 4ms --响应Header: Mike-Trace-Id : nDpT-Hjq5z-t --响应Body: Haha 1234