如何在 Java 中使用 DBCursor 获取数值？

问题描述

我正在使用 Java 和 MongoDB 从文档中检索结果。我想从 imdb.rating 获取一个数值，但似乎找不到解决方案。我可以将它作为字符串获取，然后解析该值，但它也会包含“$numberDouble”部分，这会导致我出现问题。

文档片段：

{
  "_id": {
    "$oid": "573a1390f29313caabcd42e8"
  },"plot": "A group of bandits stage a brazen train hold-up,only to find a determined posse hot on their heels.","genres": [
    "Short","Western"
  ],"runtime": 11,"cast": [
    "A.C. Abadie","Gilbert M. 'broncho Billy' Anderson","George Barnes","Justus D. Barnes"
  ],"poster": "https://m.media-amazon.com/images/M/MV5BMTU3NjE5NzYtYTYyNS00MDVmLWIwYjgtMmYwYWIxZDYyNzU2XkEyXkFqcGdeQXVyNzQzNzQxNzI@._V1_SY1000_SX677_AL_.jpg","title": "The Great Train Robbery","fullplot": "Among the earliest existing films in American cinema - notable as the first film that presented a narrative story to tell - it depicts a group of cowboy outlaws who hold up a train and rob the passengers. They are then pursued by a Sheriff's posse. Several scenes have color included - all hand tinted.","languages": [
    "English"
  ],"released": {
    "$date": "1903-12-01T00:00:00.000Z"
  },"directors": [
    "Edwin S. Porter"
  ],"rated": "TV-G","awards": {
    "wins": 1,"nominations": 0,"text": "1 win."
  },"lastupdated": "2015-08-13 00:27:59.177000000","year": 1903,"imdb": {
    "rating": {
      "$numberDouble": "7.4"
    },"Votes": 9847,"id": 439
  },"countries": [
    "USA"
  ],"type": "movie","tomatoes": {
    "viewer": {
      "rating": {
        "$numberDouble": "3.7"
      },"numReviews": 2559,"meter": 75
    },"fresh": 6,"critic": {
      "rating": {
        "$numberDouble": "7.6"
      },"numReviews": 6,"meter": 100
    },"rotten": 0,"lastUpdated": {
      "$date": "2015-08-08T19:16:10.000Z"
    }
  }
}

解决方法

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