Spring reading request body twice

Question

In spring I have a controller with an endpoint like so:

@RequestMapping(method = RequestMethod.POST)
@ResponseStatus(HttpStatus.CREATED)
@ResponseBody
publ         


        

Answer 1

To read the request body multiple times, we must cache the initial payload. Because once the original InputStream is consumed we can't read it again.

Firstly, Spring MVC provides the ContentCachingRequestWrapper class which stores the original content. So we can retrieve the body multiple times calling the getContentAsByteArray() method.

So in your case, you can make use of this class in a Filter:

@Component
public class CachingRequestBodyFilter extends GenericFilterBean {

    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain chain)
  throws IOException, ServletException {
        HttpServletRequest currentRequest = (HttpServletRequest) servletRequest;
        ContentCachingRequestWrapper wrappedRequest = new ContentCachingRequestWrapper(currentRequest);
        // Other details

        chain.doFilter(wrappedRequest, servletResponse);
    }
}

Alternatively, you can register CommonsRequestLoggingFilter in your application. This filter uses ContentCachingRequestWrapper behind the scenes and is designed for logging the requests.