当我传递"json"时，getMimeTypeFromExtension返回null.作为扩展 [英] getMimeTypeFromExtension returns null when I pass "json" as extension

问题描述

以下代码返回null

The following code returns null

MimeTypeMap.getSingleton().getMimeTypeFromExtension("json");

我已经尝试过使用其他格式，例如mp4，png等...，它可以正常工作，但不能用于json.

I've tried it with other formats like mp4, png, etc... and it works fine but fails to work for json.

我也尝试过URLConnection.guessContentTypeFromName并且也得到了null.

I've also tried URLConnection.guessContentTypeFromName and got null as well.

那么我怎样才能得到一个我希望它是"application/json"的json的mime类型呢?

So how can I get the mime type of a json which I'm expecting it to be "application/json"?

临时解决方案

public static final String MIME_TYPE_JSON = "application/json";

private static final String EXTENSION_JSON = "json";

@Nullable
public static String getMimeType(final String path) {
    // StringUtil is my own util but you can use Guava for the same result
    String extension = StringUtil.getExtension(path).toLowerCase();
    return extension.equals(EXTENSION_JSON) ?
                MIME_TYPE_JSON : MimeTypeMap.getSingleton().getMimeTypeFromExtension(extension);
}

推荐答案

Android不支持"json"(JavaScript扩展为"js")，请检查源代码

Android does not support "json" (and "js" for javascript extension), check the source code here. and see the method that you are calling, it will return null if the given extension is not listed in the defined set of content type map.

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