@ExceptionHandler处理HttpMessageNotWritableException

Question

我正在通过RestControllerAdvice处理我的响应模型。我正在尝试使用@ExceptionHandler来处理错误。

@RestControllerAdvice("cn.songxh.demo.web")
public class MyResponseBodyAdvice implements ResponseBodyAdvice {

    @Override
    public boolean supports(MethodParameter returnType, Class converterType) {
        return true;
    }

    @Override
    public Object beforeBodyWrite(Object body, MethodParameter returnType, MediaType selectedContentType, Class selectedConverterType, ServerHttpRequest request, ServerHttpResponse response) {
        MyResponse resp = new MyResponse();
        resp.setData(body);
        return resp;
    }

    @ExceptionHandler(Exception.class)
    public MyResponse exceptionHandler(Exception e) {
        e.printStackTrace();
        MyResponse resp = new MyResponse();
        resp.setSuccess(false);
        return resp;
    }
}

我希望它将{"success":false}返回给客户端。

不幸的是，当HttpMessageNotWritableException发生时，我得到了{"success":true}{"success":false}。它甚至不是有效的json字符串。

我在https://github.com/tsingheng/exception-handler-demo中创建了一个演示项目。

Answer 1

这可能会导致结果{"success":true}{"success":false}

 @Override
    public Object beforeBodyWrite(Object body, MethodParameter returnType, MediaType selectedContentType, Class selectedConverterType, ServerHttpRequest request, ServerHttpResponse response) {
       //this place add MyResponse -> {"success":true}
        MyResponse resp = new MyResponse();
        resp.setData(body);
        return resp;
    }

如果你不想beforeBofyWrite做某事

您不需要实现ResponseBodyAdvice

链接https://blog.csdn.net/u013887008/article/details/100183087