java - 尝试登录 HandlerInterceptor 时请求正文为空

Question

我正在尝试从 HttpServletRequest 记录请求正文，我添加了一个包装器来执行此操作，但在检索它后我仍然得到一个空请求正文。请问我怎么能多次得到尸体呢？

public class LogginHandlerInterceptor implements HandlerInterceptor {   
         @Override
                public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler)
                        throws Exception {
                    System.out.println("preHandle - " + handler);
                    MDC.put(START_TIME_VAR, Long.toString(System.currentTimeMillis()));
                    MultiReadHttpServletRequest requestWrapper = new MultiReadHttpServletRequest(request);

                final StringBuilder builder = new StringBuilder();
                BufferedReader reader = null;
                InputStream inputStream = requestWrapper.getInputStream();
                if (inputStream != null) {
                    reader = new BufferedReader(new InputStreamReader(inputStream));
                    String line;
                    while ((line = reader.readLine()) != null) {
                        builder.append(line);
                    }

                    MDC.put(REQUEST_BODY_VAR, builder.toString());

包装:

public class MultiReadHttpServletRequest extends HttpServletRequestWrapper {
    private ByteArrayOutputStream cachedBytes;

    public MultiReadHttpServletRequest(HttpServletRequest request) {
        super(request);
    }

    @Override
    public ServletInputStream getInputStream() throws IOException {
        if (cachedBytes == null)
            cacheInputStream();

        return new CachedServletInputStream();
    }

    @Override
    public BufferedReader getReader() throws IOException {
        return new BufferedReader(new InputStreamReader(getInputStream()));
    }

    private void cacheInputStream() throws IOException {
        /*
         * Cache the inputstream in order to read it multiple times. For
         * convenience, I use apache.commons IOUtils
         */
        cachedBytes = new ByteArrayOutputStream();
        IOUtils.copy(super.getInputStream(), cachedBytes);
    }

    /* An inputstream which reads the cached request body */
    public class CachedServletInputStream extends ServletInputStream {
        private ByteArrayInputStream input;

        public CachedServletInputStream() {
            /* create a new input stream from the cached request body */
            input = new ByteArrayInputStream(cachedBytes.toByteArray());
        }

        @Override
        public int read() throws IOException {
            return input.read();
        }
    }
}

我确实得到一个空的请求正文(rawrequest 有一个 header 但正文为空):

@RequestMapping(value = "/someuri", method = RequestMethod.POST, consumes = MediaType.APPLICATION_JSON_VALUE, produces = MediaType.APPLICATION_JSON_VALUE)
public @ResponseBody Object post(final HttpServletRequest request,
        @PathVariable final String parameter, @PathVariable final String parameter2,
        HttpEntity<String> rawrequest, @RequestHeader("Authorization") final String Authorization) {

Answer 1

我找到了在拦截器中使用 setAttribute 重置请求正文的解决方案。

request.setAttribute("com.xp.input", body);

然后我在我的过程中检索它:

Object body = request.getAttribute("com.xp.input");