java “APPLICATION_JSON”和“APPLICATION_JSON_VALUE”之间的区别
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difference between 'APPLICATION_JSON' and 'APPLICATION_JSON_VALUE'
提问by PrabaharanKathiresan
I am new to spring development and want to know what is the difference between
MediaType.APPLICATION_JSON_VALUEand MediaType.APPLICATION_JSON?
我是 Spring 开发的新手，想知道MediaType.APPLICATION_JSON_VALUE和之间有什么区别
MediaType.APPLICATION_JSON？
I have a thought of both are representing same application/jsoncontent type but if I put MediaType.APPLICATION_JSONsome compiler errors are shown to add @controllerand @ResponseBodyannotations to my rest controller and When to use MediaType.APPLICATION_JSON?
我认为两者都表示相同的application/json内容类型，但是如果我将MediaType.APPLICATION_JSON一些编译器错误显示为向我的其余控制器添加@controller和@ResponseBody注释以及何时使用MediaType.APPLICATION_JSON？
@RequestMapping(value="/invite", method = POST, consumes = { MediaType.APPLICATION_JSON })
public @ResponseBody String sendInvite( ... ) { ... }
回答by Andy Wilkinson
To quote the javadoc, MediaType.APPLICATION_JSONis a "public constant media type for application/json", whereas MediaType.APPLICATION_JSON_VALUEis a "String equivalent of MediaType.APPLICATION_JSON".
引用javadoc，MediaType.APPLICATION_JSON是“公共常量媒体类型application/json”，而是MediaType.APPLICATION_JSON_VALUE“字符串等价物MediaType.APPLICATION_JSON”。
Attributes on Java annotations can only be one of a limited set of types. This prevents MediaTypefrom being used as an annotation attribute. To overcome this, a Stringis used instead along with the various Stringconstants on MediaTypeincluding MediaType.APPLICATION_JSON_VALUE.
Java 注释上的属性只能是一组有限的类型之一。这可以防止MediaType被用作注释属性。为了克服这个问题， aString与包括的各种String常量一起使用。MediaTypeMediaType.APPLICATION_JSON_VALUE
Outside of an annotation, if you want to refer to a media type you should use the more strongly typed MediaTyperather than passing around a Stringthat may or may not actually be a media type. So, for example, you'd use MediaType.APPLICATION_JSONrather than MediaType.APPLICATION_JSON_VALUE.
在注解之外，如果你想引用一个媒体类型，你应该使用更强类型的MediaType而不是传递一个String实际上可能是也可能不是媒体类型的 a 。因此，例如，您将使用MediaType.APPLICATION_JSON而不是MediaType.APPLICATION_JSON_VALUE.
