解决流只能读一次的问题，getInputStream() has already been called for this request

场景：在aop的日志中想获取 post请求的json数据时报错，因为在后台控制器的接口中流已经读取了，导致日志这里获取就会报错，需要重写请求的 getInputStream getReader，然后配置一个过滤器

1、requestWrapper

public class StreamWrapper extends HttpServletRequestWrapper{public String _body;public StreamWrapper(HttpServletRequest request) throws IOException {super(request);StringBuffer sBuffer = new StringBuffer();BufferedReader bufferedReader = request.getReader();String line;while ((line = bufferedReader.readLine()) != null) {sBuffer.append(line);}_body = sBuffer.toString();}@Overridepublic ServletInputStream getInputStream() {final ByteArrayInputStream byteArrayInputStream = new ByteArrayInputStream(_body.getBytes());return new ServletInputStream() {@Overridepublic int read() {return byteArrayInputStream.read();}@Overridepublic boolean isFinished() {return false;}@Overridepublic boolean isReady() {return false;}@Overridepublic void setReadListener(ReadListener listener) {}};}@Overridepublic BufferedReader getReader() {return new BufferedReader(new InputStreamReader(this.getInputStream()));}}

2、定义一个过滤器

public class StreamFilter implements Filter {private  final Set<String> ALLOWED_PATHS = Collections.unmodifiableSet(new HashSet<>(Arrays.asList("/api/file/upload")));@Overridepublic void init(FilterConfig filterConfig) throws ServletException {}@Overridepublic void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {ServletRequest requestWrapper = null;if(request instanceof HttpServletRequest) {HttpServletRequest servletRequest = (HttpServletRequest) request;String requestURI = servletRequest.getRequestURI();if (ALLOWED_PATHS.contains(requestURI)){chain.doFilter(servletRequest,response);}else {requestWrapper = new StreamWrapper(servletRequest);//获取请求中的流如何，将取出来的字符串，再次转换成流，然后把它放入到新request对象中。// 在chain.doFiler方法中传递新的request对象chain.doFilter(requestWrapper, response);}}}@Overridepublic void destroy() {}
}

3、springboot配置过滤器

@Configuration
public class StreamConfig {@Value("${stream.enabled}")private String enabled;@Value("${stream.excludes}")private String excludes;@Value("${stream.urlPatterns}")private String urlPatterns;@Beanpublic FilterRegistrationBean StreamRegistration() {FilterRegistrationBean streamBean = new FilterRegistrationBean();streamBean.setDispatcherTypes(DispatcherType.REQUEST);streamBean.setFilter(new StreamFilter());streamBean.addUrlPatterns(urlPatterns);streamBean.setName("StreamFilter");streamBean.setOrder(Integer.MAX_VALUE);Map<String, String> initParameters = new HashMap<>(16);initParameters.put("excludes", excludes);initParameters.put("enabled", enabled);streamBean.setInitParameters(initParameters);return streamBean;}}

4、yml文件

stream:# 过滤开关enabled: true# 排除链接（多个用逗号分隔）excludes: /api/file/*,/api/file/upload# 匹配链接urlPatterns: /api/*

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解决流只能读一次的问题，getInputStream() has already been called for this request

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