Spring REST service: retrieving JSON from Request

Question

I am building a REST service on Spring 3.1. I am using @EnableWebMVC annotation for that. Since my service will only be accepting JSON requests, I would also like to dump th

Answer 1

For getting data from Body you can try to read and recreate InputStream in RequestBodyAdviceAdapter:

@ControllerAdvice
public class CustomRequestBodyAdviceAdapter extends RequestBodyAdviceAdapter {

    @Override
    public HttpInputMessage beforeBodyRead(HttpInputMessage inputMessage, MethodParameter parameter, Type targetType, Class> converterType) throws IOException {
        String body = IOUtils.toString(inputMessage.getBody(), UTF_8.name());

        HttpInputMessage myMessage = new HttpInputMessage(){
            @Override
            public InputStream getBody() throws IOException {
                return new ByteArrayInputStream(body.getBytes());
            }
            @Override
            public HttpHeaders getHeaders() {
                return inputMessage.getHeaders();
            }
        };

        System.out.println("Data from Body: " + body);

        return super.beforeBodyRead(myMessage, parameter, targetType, converterType);
    }

    @Override
    public Object handleEmptyBody(Object body, HttpInputMessage inputMessage, MethodParameter parameter, Type targetType, Class> converterType) {
        System.out.println("Data from Body is empty");
        return super.handleEmptyBody(body, inputMessage, parameter, targetType, converterType);
    }

    @Override
    public Object afterBodyRead(Object body, HttpInputMessage inputMessage, MethodParameter parameter, Type targetType, Class> converterType) {
        return super.afterBodyRead(body, inputMessage, parameter, targetType, converterType);
    }

    @Override
    public boolean supports(MethodParameter methodParameter, Type targetType, Class> converterType) {
        return true;
    }
}