java - Jersey @Consumes 端点如何匹配？

Question

我正在设计一个 RESTful 端点来接收文件。我希望它接受 POSTing 作为纯文件/流和多部分。 servlet 容器如何匹配端点有规则吗？下面的代码能可靠地工作吗，或者这个实现是特定的？我可以使用 WILDCARD，还是必须将其限制为 APPLICATION_OCTET_STREAM？

@Path("foo")
public class Foo {
    @POST
    @Path("{filename}")
    @Consumes(MediaType.WILDCARD)
    public Response uploadFileDirect(
        @PathParam("filename") String filename,
        InputStream is)
    {
        // process input stream
        Response.ok().build();
    }

    @POST
    @Path("{filename}")
    @Consumes(MediaType.MULTIPART_FORM_DATA)
    public Response uploadFileMultipart(
        @PathParam("filename") String filename,
        @FormDataParam("file") InputStream is)
    {
        // process input stream
        Response.ok().build();
    }
}

Answer 1

这在 JAX-RS spec 中指定3.7.2 请求匹配

[...]

Resource class/object is found and all resource and sub resource methods are put into set M

[...]

3. Identify the method that will handle the request:
   a. Filter M by removing members that do not meet the following criteria:
       [...]
   b. Sort M in descending order as follows:
       * The primary key is the media type of input data. Methods whose @Consumes value is the best match for the media type of the request are sorted first.
       * The secondary key is the @Produces value. Methods whose value of @Produces best matches the value of the request accept header are sorted first.

Determining the best matching media types follows the general rule: n/m > n/* > */*, i.e. a method that explicitly consumes the request media type or produces one of the requested media types is sorted before a method that consumes or produces */*.

如果您查看最后一段(确定最佳匹配)，它表示 */* (MediaType.WILDCARD) 的优先级最低。更具体的媒体类型将永远获胜。