RFC 7231规范并不阻止在DELETE方法中接受RequestBody。

A payload within a DELETE request message has no defined semantics; sending a payload body on a DELETE request might cause some existing  implementations to reject the request.

如果基础Web服务器配置为解析DELETE方法的正文，则可以接受请求正文。

所以我找到了我一直在寻找的方法。这个问题可以用Rest模板来解决

RestTemplate restTemplate = new RestTemplate();
HttpEntity<Model> request = new HttpEntity<>(new Model("data"));
restTemplate.exchange(url, HttpMethod.DELETE, request, null);