使用java提取JSON字段 [英] Extracting JSON fields using java

问题描述

我想通过将页面ID作为参数来提取一个喜欢Facebook页面的人的细节。我提取了该页面的JSON内容，现在我要提取用户的名称和ID。

I am trying to extract a person's details who liked a facebook page by passing the page id as parameter. I extracted the JSON content of that page and now from that I want to extract name and id of users.

如何实现？

JSONObject json = readurl("https://graph.facebook.com/pageid");
System.out.println(json.toString());
System.out.println("Page id is:"+json.get("id"));

JSON：

JSON:

"likes":{
"data":[
    {
        "id":"*******",
        "name":"vv"
    },
    {
        "id":"********",
        "name":"abc"
    },

推荐答案

这样的代码会做到这一点。 >

Code like this would do the trick.

JSONObject json = readurl("https://graph.facebook.com/pageid");
JSONArray dataJsonArray = json.getJSONArray("data");
for(int i=0; i<dataJsonArray.length; i++) {
   JSONObject dataObj = dataJsonArray.get(i);
   String id = dataObj.getString("id");
   //Similarly you can extract for other fields.
}

基本上数据一个JSONArray，因为它以 []开头。所以简单的 get 将无法正常工作，您必须使用JSONArray。

Basically data is a JSONArray since it starts with [. So simply get would not work, you must use JSONArray.

注意：没有编译这段代码，但我想我给你的想法继续。另请参阅此链接，以取得在java中解析JSON的基础知识。

Note: I haven't compiled this code, but I think I gave you idea to proceed. Also refer this link to get hold of basics of parsing JSON in java.

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