HTTP状态415 - 执行POST时不支持的媒体类型 [英] HTTP Status 415 - Unsupported Media Type when doing POST

问题描述

所以我试图在Chrome中使用REST与 Postman 进行 POST ，但在我点击发送后错误

So I was trying to do a POST using REST with Postman in Chrome, but after I hit send got error

HTTP状态415 - 不支持的媒体类型

HTTP Status 415 - Unsupported Media Type

我的代码和屏幕截图的一部分包含在内，我试过的 hashmap 的对是持续时间和 150 。我确定网址是正确的，但不知道为什么媒体类型不被接受。

My code and part of the screen shot is included, the pair for the hashmap I tried is duration and 150. I am sure the URL is correct but don't know why the media type is not accepted.

@Path("activities")
public class ActivityResource {

    @POST
    @Path("activity")
    @Consumes(MediaType.APPLICATION_FORM_URLENCODED)
    @Produces({MediaType.APPLICATION_JSON,MediaType.APPLICATION_XML})
    public Activity createActivityParams(MultivaluedHashMap<String,String> formParams){
        return null;
    }
}

推荐答案

是的，我怀疑， FormMultivaluedMapProvider （处理 MultivaluedMap 读取 application / x-www-form-urlencoded Content-Type仅允许 MultivaluedMap< String，String> 或 MultivaluedMap ，而不是 MultivaluedHashMap ，就像你一样。

Yeah so as I suspected, the FormMultivaluedMapProvider (which handles MultivaluedMap reading for application/x-www-form-urlencoded Content-Type only allows for MultivaluedMap<String, String> or MultivaluedMap, not MultivaluedHashMap, as you have.

这是 isReadable （当运行时查找 MessageBodyReader 以处理组合时调用Java / Content-Type类型。

Here is the source for the isReadable (which is called when the runtime looks for a MessageBodyReader to handle the combination of Java/Content-Type types.

@Override
public boolean isReadable(Class<?> type, Type genericType, 
                          Annotation[] annotations, MediaType mediaType) {
    // Only allow types MultivaluedMap<String, String> and MultivaluedMap.
    return type == MultivaluedMap.class
            && (type == genericType || mapType.equals(genericType));
}

---

如旁注，在写作方面，这是一个不同的故事，你可以看到 isWriteable 方法，使用 isAssignableFrom ，如果 isReadable ，则可以使用 MultivaluedHashMap 作为方法参数。

---

As as side note, on the writing side, it's a different story, you can see the isWriteable method, uses isAssignableFrom, which if the isReadable had, you would be able to use the MultivaluedHashMap as your method parameter.

@Override
public boolean isWriteable(Class<?> type, Type genericType, 
                           Annotation[] annotations, MediaType mediaType) {
    return MultivaluedMap.class.isAssignableFrom(type);
}

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