访问项目的成员在JSONArray与Java [英] Accessing members of items in a JSONArray with Java

问题描述

我刚开始接触使用JSON和Java。我不知道如何在JSONArray内访问字符串值。例如，我的JSON是这样的：

I'm just getting started with using json with java. I'm not sure how to access string values within a JSONArray. For instance, my json looks like this:

{
  "locations": {
    "record": [
      {
        "id": 8817,
        "loc": "NEW YORK CITY"
      },
      {
        "id": 2873,
        "loc": "UNITED STATES"
      },
      {
        "id": 1501
        "loc": "NEW YORK STATE"
      }
    ]
  }
}

我的code：

JSONObject req = new JSONObject(join(loadStrings(data.json),""));
JSONObject locs = req.getJSONObject("locations");
JSONArray recs = locs.getJSONArray("record");

我在这一点上获得了记录JSONArray，但我不确定，我怎么会得到ID和禄的价值观中的for循环。很抱歉，如果这个描述不是太清楚，我有点新的节目。

I have access to the "record" JSONArray at this point, but am unsure as to how I'd get the "id" and "loc" values within a for loop. Sorry if this description isn't too clear, I'm a bit new to programming.

推荐答案

您是否尝试过使用<一个href=\"http://json.org/javadoc/org/json/JSONArray.html#getJSONObject%28int)\"><$c$c>JSONArray.getJSONObject(int),和<一个href=\"http://json.org/javadoc/org/json/JSONArray.html#length%28)\"><$c$c>JSONArray.length()创建for循环：

Have you tried using JSONArray.getJSONObject(int), and JSONArray.length() to create your for-loop:

for (int i = 0; i < recs.length(); ++i) {
    JSONObject rec = recs.getJSONObject(i);
    int id = rec.getInt("id");
    String loc = rec.getString("loc");
    // ...
}

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