java - 如何使用 RequestBodyAdvice

Question

@ControllerAdvice
public class RequestBodyAdviceChain implements RequestBodyAdvice {

    @Override
    public boolean supports(MethodParameter methodParameter, Type type,
            Class< ? extends HttpMessageConverter< ? >> aClass) {
        return true;
    }

    @Override
    public Object handleEmptyBody(Object o, HttpInputMessage httpInputMessage, MethodParameter methodParameter,
            Type type, Class< ? extends HttpMessageConverter< ? >> aClass) {
        return o;
    }

    @Override
    public HttpInputMessage beforeBodyRead(HttpInputMessage httpInputMessage, MethodParameter methodParameter,
            Type type, Class< ? extends HttpMessageConverter< ? >> aClass) throws IOException {
        return httpInputMessage;
    }

    @Override
    public Object afterBodyRead(Object o, HttpInputMessage httpInputMessage, MethodParameter methodParameter, Type type,
            Class< ? extends HttpMessageConverter< ? >> aClass) {
        return o;
    }
}

理想情况下，流程应该先到达这些功能，然后再到达 Controller ，但它不起作用。

Answer 1

@ControllerAdvice组件应该像任何其他组件一样在 Spring 的上下文中注册。确保 Spring 看到这个组件，e.q.通过将其包含在 @ComponentScan 中(Java 配置)或在 <context:component-scan/> 中(xml 方式)。注册它的首选上下文是 Dispatcher Servlet 的上下文。