How to get the HTTP Request body content in a Spring Boot Filter?

Question

I want to get the raw content that is posted towards a RestController. I need it to do some processing on the raw input.

How can I get the raw body content without interfering with the Filter Chain?

Answer 1

Here is a sample of controllerAdvice where you can access RequestBody and RequestHeader as you do in your controller. The Model attribute method is basically to add model attributes which are used across all pages or controller flow. It gets invoked before the controller methods kick in. It provides cleaner way of accessing the RESTful features rather than convoluted way.

@ControllerAdvice(annotations = RestController.class)
public class ControllerAdvisor {

    @ModelAttribute
    public void addAttributes(HttpServletRequest request, HttpServletResponse response,Model model, @RequestBody String requestString, @RequestHeader(value = "User-Agent") String userAgent) {
        // do whatever you want to do on the request body and header. 
        // with request object you can get the request method and request path etc.
        System.out.println("requestString" + requestString);
        System.out.println("userAgent" + userAgent);
        model.addAttribute("attr1", "value1");
        model.addAttribute("attr2", "value2");
    }   

}