java - 使用 org.json 在 Java 中解析 JSON

Question

我有一个大文件，其中包含许多类似于以下内容的 JSON 对象。我需要解析所有内容以使用 org.json library 将“bought_together”项目作为数组获取。我无法访问嵌套在“相关”中的任何内容。

检索“bought_together”列表所需的代码是什么？

{
  "asin": "11158732",
  "title": "Girls Ballet Tutu Zebra Hot Pink",
  "price": 3.17,
  "imUrl": "http://ecx.images-amazon.com/images/I/51fAmVkTbyL._SY300_.jpg",
  "related":
  {
    "also_bought": ["L00JHONN1S", "B002BZX8Z6"],
    "also_viewed": ["F002BZX8Z6", "B00JHONN1S", "B008F0SU0Y", "B00D23MC6W", "B00AFDOPDA"],
    "bought_together": ["D202BZX8Z6"]
  },
  "salesRank": {"Toys & Games": 211836},
  "brand": "Coxlures",
  "categories": [["Sports & Outdoors", "Other Sports", "Dance"]]
}

这是我的尝试(请注意，这是在 MapReduce 程序中，因此某些行可能看起来脱离上下文。):

JSONObject object = new JSONObject(sampleText); //sampleText is json that has been split by line
JSONArray boughtTogether = new JSONArray(object.getJSONArray("bought_together"));

Answer 1

使用以下代码，希望对您有所帮助。

//this will be your json object that contains and convert your string to jsonobject
//if you have json object already skip this.
JSONObject yourJSON = new JSONObject(targetString);

//getting the "related" jsonObject
JSONObject related = yourJSON.getJSONObject("related");

//getting the "bought_together" as an jsonArray and do what you want with it.
//you can act with jsonarray like an array
JSONArray bought_together = related.getJSONArray("bought_together");


//now if you run blow code

System.out.print(bought_together.getString(0));

//output is : D202BZX8Z6

--------根据更新问题更新------你应该像这样更改你的代码:

JSONObject object = new JSONObject(sampleText); //sampleText is json that has been split by line

JSONObject related = object.getJSONObject("related");

JSONArray boughtTogether = related.getJSONArray("bought_together");

--------更新-----

我认为你需要这一点(这不是技术上的所有区别)

• 所有东西都在 {} 中，它们将是 JSONObject 和关系键和值如下:

  {“姓名”:“阿里”}

  这是一个jsonobject，键“name”的值为ali，我们称之为ali像:

  myJsonObject.getString("name");

• 所有内容都在 [] 中，它们将是 JSONArray 并且关系是索引和值如:

  [“阿里”]

  这是一个 JsonArray，索引 0 的值为 ali，我们称之为
  像:

  myJsonArray.getString(0);

所以在你的情况下:

1. 您的总对象是一个 JSONObject
2. “相关”键的值仍然是 JSONObject
3. “bought_together”键的值(位于 {jsonobject}“相关”键的值内)是一个 JSONArray