我正在使用Jersey定义如下服务:@Path("/studentIds")publicvoidwriteList(JsonArraystudentIds){//iterateoverstudentIdsandsavethem}JsonArray在哪里:publicclassJsonArrayextendsArrayList{publicJsonArray(Stringv)throwsIOException{ObjectMapperobjectMapper=newObjectMapper(newMappingJsonFactory());TypeReference>typeRef=ne

iOS11带有拖放功能。我想用它来将PDF文件导入我的应用程序。我通过实现object(withItemProviderData:typeIdentifier:)静态方法和readableTypeIdentifiersForItemProvider属性创建了一个符合NSItemProviderReading协议(protocol)的类:importFoundation@available(iOS11.0,*)finalclassMyDropItem:NSObject,NSItemProviderReading{@objcletdata:Data@objclettypeIdentifie

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