使用java提取JSON字段
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Extracting JSON fields using java
提问by lulu
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.
我试图通过将页面 id 作为参数传递来提取喜欢 facebook 页面的人的详细信息。我提取了该页面的 JSON 内容，现在我想从中提取用户的名称和 ID。
How do I achieve that ?
我如何做到这一点？
Code:
代码：
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"
},
采纳答案by Pradeep Simha
Code like this would do the trick.
像这样的代码可以解决问题。
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.
}
Basically datais a JSONArray since it starts with [. So simply getwould not work, you must use JSONArray.
基本上data是一个 JSONArray，因为它以[. 所以根本get行不通，你必须使用 JSONArray。
Note:I haven't compiled this code, but I think I gave you idea to proceed. Also refer thislink to get hold of basics of parsing JSON in java.
注意：我还没有编译这段代码，但我想我给了你继续的想法。另请参阅此链接以了解在 Java 中解析 JSON 的基础知识。
回答by Thom
I use google's Gson library from: https://code.google.com/p/google-gson/
我使用谷歌的 Gson 库：https: //code.google.com/p/google-gson/
回答by trylimits
This snippet is not tested, but I'm pretty sure it works:
此代码段未经测试，但我很确定它有效：
JSONArray data = json.getJSONArray("data");
for (int i=0; i < data.length(); i++) {
JSONObject o = data.getJSONObject(i);
sysout(o.getString("id");
sysout(o.getString("name");
}
