之前利用HttpServletRequest.getInputStream()和RequestWrapper实现了请求的requestBody获取，现在提出将一个请求的RequestBody和ResponseBody都提出来并打印日志&落入数据库，以便统计和查找问题。
查找资料后确定两种技术方案
1. 使用AOP对所有Controller的方法进行环绕通知处理；
2. 使用Filter拦截所有的Request和Response，并获取body。
最后选择了第二种方式，具体实现记录如下。
具体实现
日志记录过滤器
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public class RequestFilter implements Filter{private static final String LOG_FORMATTER_IN = "请求路径：{%s}，请求方法：{%s}，参数：{%s}，来源IP：{%s}，请求开始时间{%s}，返回：{%s}，请求结束时间{%s}，用时:{%s}ms，操作类型：{%s}，操作人：{%s}";public static final String USER_TOKEN_REDIS_PREFIX = "token_prefix";private static final Logger log = LoggerFactory.getLogger(RequestFilter.class);//request拦截的conten-type列表private List<String> contentTypes;@Overridepublic void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException { HttpServletRequest httpServletRequest = (HttpServletRequest) request; HttpServletResponse httpServletResponse = (HttpServletResponse) response; //请求路径 String path = httpServletRequest.getRequestURI(); String method = httpServletRequest.getMethod(); //所有请求参数的Map Map<String,String> paramMap = new HashMap<>(); //请求的真实IP String requestedIP = RequestUtils.getRealIP(httpServletRequest); //是否拦截并包装请求，如果需要拦截则会获取RequestBody，一般为application/json才拦截 boolean filterRequestFlag = checkFilter(request.getContentType()); if (filterRequestFlag) { httpServletRequest = new MyRequestBodyReaderWrapper(httpServletRequest); } //获取所有queryString和requestBody Map<String, String> requestParamMap = RequestUtils.getRequestParamMap(httpServletRequest); if (requestParamMap != null && !requestParamMap.isEmpty()){ paramMap.putAll(requestParamMap); } //获取header参数 Map<String, String> headerMap = RequestUtils.getHeaders(httpServletRequest); if (headerMap != null && !headerMap.isEmpty()){ paramMap.putAll(headerMap); } //获取路径参数 Map<String,String> uriTemplateMap = RequestUtils.getUriTemplateVar(httpServletRequest); if (uriTemplateMap != null && !uriTemplateMap.isEmpty()){ paramMap.putAll(uriTemplateMap); } //包装Response，重写getOutputStream()和getWriter()方法，并用自定义的OutputStream和Writer来拦截和保存ResponseBody MyResponseWrapper responseWrapper = new MyResponseWrapper(httpServletResponse); //请求开始时间 Long dateStart = System.currentTimeMillis(); //Spring通过DispatchServlet处理请求 chain.doFilter(httpServletRequest, responseWrapper); //请求结束时间 Long dateEnd = System.currentTimeMillis(); String responseBody; if (responseWrapper.getMyOutputStream() == null){ if (responseWrapper.getMyWriter() != null){ responseBody = responseWrapper.getMyWriter().getContent(); //一定要flush，responseBody会被复用 responseWrapper.getMyWriter().myFlush(); } }else { responseBody = responseWrapper.getMyOutputStream().getBuffer(); //一定要flush，responseBody会被复用 responseWrapper.getMyOutputStream().myFlush(); } String params = JSONObject.toJSONString(paramMap); log.info(String.format(LOG_FORMATTER_IN, path, method, params, requestedIP, dateStart, responseBody, dateEnd,(dateEnd - dateStart));}/** * 判断请求/返回是否为application/json * 是则进行拦截， * 否则退出 * @param contentType 请求/响应类型 */private boolean checkFilter(String contentType) { boolean filterFlag = false;//是否继续拦截 for (String p : getContentTypes()) { if (StringUtils.contains(contentType, p)){ filterFlag = true; } } if (StringUtils.isEmpty(contentType)){ filterFlag = true; } return filterFlag;}} |
Request包装器
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/*** HttpServletRequest的包装器，为了在拦截器阶段获取requestBody且不妨碍SpringMVC再次获取requestBody*/@Slf4jpublic class MyRequestBodyReaderWrapper extends HttpServletRequestWrapper {//存放JSON数据主体private final byte[] body;public MyRequestBodyReaderWrapper(HttpServletRequest request) throws IOException { super(request); body = getBody(request).getBytes(Charset.forName("UTF-8"));}@Overridepublic ServletInputStream getInputStream() throws IOException { final ByteArrayInputStream byteArrayInputStream = new ByteArrayInputStream(body); return new ServletInputStream() { @Override public int read() throws IOException { return byteArrayInputStream.read(); } };}@Overridepublic BufferedReader getReader() throws IOException { return new BufferedReader(new InputStreamReader(this.getInputStream()));}/** * 获取请求Body */public static String getBody(ServletRequest request) { StringBuilder sb = new StringBuilder(); InputStream inputStream = null; BufferedReader reader = null; try { inputStream = request.getInputStream(); reader = new BufferedReader(new InputStreamReader(inputStream, Charset.forName("UTF-8"))); String line; while ((line = reader.readLine()) != null) { sb.append(line); } } catch (IOException e) { log.error("MyRequestBodyReaderWrapper.getBody()异常-->",e); } finally { if (inputStream != null) { try { inputStream.close(); } catch (IOException e) { log.error("MyRequestBodyReaderWrapper.getBody()异常-->",e); } } if (reader != null) { try { reader.close(); } catch (IOException e) { log.error("MyRequestBodyReaderWrapper.getBody()异常-->",e); } } } return sb.toString();}} |
RequestUtils
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/*** 请求工具类*/public class RequestUtils {private static final Logger logger = LoggerFactory.getLogger(RequestUtils.class);/** * 获取所有的请求头 * @param request * @return */public static Map<String,String> getHeaders(HttpServletRequest request){ Map<String,String> headerMap = new HashMap<>(); List<String> headers = getCommonHeaders(); headers.add("Postman-Token"); headers.add("Proxy-Connection"); headers.add("X-Lantern-Version"); headers.add("Cookie"); Enumeration<String> headerNames = request.getHeaderNames(); while (headerNames.hasMoreElements()){ String headerName = headerNames.nextElement(); if (headers.contains(headerName)){ continue; } headerMap.put(headerName,request.getHeader(headerName)); } return headerMap;}/** * 获取请求的路径参数 * @param request * @return */public static Map<String, String> getUriTemplateVar(HttpServletRequest request) { NativeWebRequest webRequest = new ServletWebRequest(request); Map<String, String> uriTemplateVars = (Map<String, String>) webRequest.getAttribute(HandlerMapping.URI_TEMPLATE_VARIABLES_ATTRIBUTE, RequestAttributes.SCOPE_REQUEST); return uriTemplateVars;}/** * 获取请求的真实IP * @param request * @return */public static String getRealIP(HttpServletRequest request) { String ip = request.getHeader("X-Forwarded-For"); if (StringUtils.isNotEmpty(ip) && !"unKnown".equalsIgnoreCase(ip)) { //多次反向代理后会有多个ip值，第一个ip才是真实ip int index = ip.indexOf(","); if (index != -1) { return ip.substring(0, index); } else { return ip; } } ip = request.getHeader("X-Real-IP"); if (StringUtils.isNotEmpty(ip) && !"unKnown".equalsIgnoreCase(ip)) { return ip; } return request.getRemoteAddr();}/** * 从Request中获取所有的请求参数，包括GET/POST/PATCH等请求，不包括路径参数 * @param request * @return */public static Map<String,String> getRequestParamMap(HttpServletRequest request) { Map<String,String> paramMap = new HashMap<>(); //获取QueryString中的参数，GET方式 或application/x-www-form-urlencoded Map<String, String> queryParamMap = RequestUtils.getUriQueryVar(request); if (queryParamMap != null){ paramMap.putAll(queryParamMap); } //获取Body中的参数，POST/PATCH等方式,application/json Map<String,String> bodyParamMap = null; try { //当为POST请求且 application/json时，request被RequestFilter处理为wrapper类 if (!(request instanceof MyRequestBodyReaderWrapper)){ return paramMap; } MyRequestBodyReaderWrapper readerWrapper = (MyRequestBodyReaderWrapper) request; String requestBody = new String(readerWrapper.getBody(), "UTF-8"); if (com.zhongan.health.common.utils.StringUtils.isNotBlank(requestBody)){ /** * 该方法为了避免 fastJson在 反序列化多层json时，改变对象顺序 */ bodyParamMap = JSONObject.parseObject(requestBody, new TypeReference<LinkedHashMap<String,String>>(){}, Feature.OrderedField); } } catch (Exception e) { logger.error("获取请求Body异常-->",e); } if (bodyParamMap != null){ paramMap.putAll(bodyParamMap); } return paramMap;}private static List<String> getCommonHeaders(){ List<String> headers = new ArrayList<>(); Class<HttpHeaders> clazz = HttpHeaders.class; Field[] fields = clazz.getFields(); for (Field field : fields) { field.setAccessible(true); if (field.getType().toString().endsWith("java.lang.String") && Modifier.isStatic(field.getModifiers())){ try { headers.add((String) field.get(HttpHeaders.class)); } catch (IllegalAccessException e) { logger.error("反射获取属性值异常-->",e); } } } return headers;}} |
Response包装器
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/***该包装器主要是重写getOutputStream()和getWriter()方法，给调用者返回自定义的OutputStream和Writer，以便参与输出的过程并记录保存responseBody。*/public class MyResponseWrapper extends HttpServletResponseWrapper {private ResponsePrintWriter writer;private MyServletOutputStream out;public MyResponseWrapper(HttpServletResponse response) { super(response);}@Overridepublic ServletOutputStream getOutputStream() throws IOException { //一定要先判断当前out为空才能去新建out对象，否则一次请求会出现多个out对象 if (out == null){ out = new MyServletOutputStream(super.getOutputStream()); } return out;}@Overridepublic PrintWriter getWriter() throws IOException { //一定要先判断当前writer为空才能去新建writer对象，否则一次请求会出现多个writer对象 if (writer == null){ writer = new ResponsePrintWriter(super.getWriter()); } return writer;}public ResponsePrintWriter getMyWriter() { return writer;}public MyServletOutputStream getMyOutputStream(){ return out;}} |
自定义Writer
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/***自定义Writer，重写write方法，并记录保存ResponseBody*/public class ResponsePrintWriter extends PrintWriter{private StringBuffer buffer;public ResponsePrintWriter(PrintWriter out) { super(out); buffer = new StringBuffer();}public String getContent(){ return buffer == null ? null : buffer.toString();}@Overridepublic void flush() { super.flush();}//清空buffer，以便下一次重新使用public void myFlush(){ buffer = null;}@Overridepublic void write(char[] buf, int off, int len) { super.write(buf, off, len); char[] destination = new char[len]; System.arraycopy(buf,off,destination,0,len); buffer.append(destination);}@Overridepublic void write(String s) { super.write(s); buffer.append(s);}} |
自定义OutputStream
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/*** 自定义输出流包装器，重写write方法，并记录保存ResponseBody*/public class MyServletOutputStream extends ServletOutputStream {private ServletOutputStream outputStream;private StringBuffer buffer;public MyServletOutputStream(ServletOutputStream outputStream) { this.outputStream = outputStream; buffer = new StringBuffer();}@Overridepublic void write(int b) throws IOException { outputStream.write(b);}@Overridepublic void write(byte[] b, int off, int len) throws IOException { outputStream.write(b, off, len); byte[] bytes = new byte[len]; System.arraycopy(b, off, bytes, 0, len); buffer.append(new String(bytes,"UTF-8"));}@Overridepublic void write(byte[] b) throws IOException { outputStream.write(b);}@Overridepublic void flush() throws IOException { super.flush();}//清空buffer，以便下一次重新使用public void myFlush(){ outputStream = null; buffer = null;}public String getBuffer() { if (buffer != null){ return buffer.toString(); } return null;}} |
总结一下
-
Request.getInputStream一次请求中只能被调用一次； -
Response.getOutputStream()无法获取ResponseBody； -
Response的输出有两种方式，都需要考虑到并重写
getOutputStream().write()
getWrite().write()
以上为个人经验，希望能给大家一个参考，也希望大家多多支持服务器之家。
原文链接：https://blog.csdn.net/panyongcsd/article/details/80990397
