In my Springboot application, I use RequestDispatcher
forward to send the request and response to a remote service. Now I need to get that response
and request
as string to log it into database.
The request
and response
both contain JSON data.
RequestDispatcher requestDispatcher = request.getRequestDispatcher(configAPI.getUserByPhoneUrl());
requestDispatcher.forward(request, response);
The RequestDispatcher
will modify the response in-place. So after the forward()
function, I'm unable to get the json from the response created by requestDispatcher.forward(request, response)
.
@RequestMapping(value = "/getUserByPhone", method = {RequestMethod.GET}, produces = "application/json;charset=utf-8")
public void getUserbyIsdn(HttpServletRequest request, HttpServletResponse response) {
// Forward the request to the remote service
RequestDispatcher requestDispatcher = request.getRequestDispatcher(configAPI.getUserByPhoneUrl());
requestDispatcher.forward(request, response);
// response now has result from remote service
// TODO: print out json in response here
}
Any idea on how to get response as json?
I've try using HttpServletResponseWrapper
to access the response but unable to.
Example code using HttpServletResponseWrapper
:
HttpServletRequestWrapper requestWrapper = new HttpServletRequestWrapper(request);
HttpServletResponseWrapper responseWrapper = new HttpServletResponseWrapper(response);
// Forward the request to the remote service
request.getRequestDispatcher(configAPI.getUserByPhoneUrl()).forward(requestWrapper, responseWrapper);
but is result in NullPointerException because ApplicationContext
request is not set.
After some trying out, I was able to get response and request json string using ContentCachingRequestWrapper
and ContentCachingResponseWrapper
. The controller now become like this:
@RequestMapping(value = "/getUserByPhone", method = {RequestMethod.GET}, produces = "application/json;charset=utf-8")
public void getUserbyIsdn(HttpServletRequest request, HttpServletResponse response) throws IOException, ServletException {
ContentCachingRequestWrapper requestWrapper = new ContentCachingRequestWrapper(request);
ContentCachingResponseWrapper responseWrapper = new ContentCachingResponseWrapper(response);
requestWrapper.getRequestDispatcher(configAPI.getApi_getUserbyIsdn_user()).forward(requestWrapper, responseWrapper);
// do what ever you want here with response and request
apiLogService.addApiLog(requestWrapper, responseWrapper, "getUserByIsdn", timer);
// have to has this to return original response of other service
responseWrapper.copyBodyToResponse();
}
Function addApiLog
:
public void addApiLog(ContentCachingRequestWrapper request, ContentCachingResponseWrapper response) {
String requestJson = IOUtils.toString(request.getContentAsByteArray());
String responseJson = IOUtils.toString(response.getContentAsByteArray());
// handle json String using JSONObject or GSON as needed
}