我试图在Java中迭代以下JsonObject代码，我正在使用google gson。
意图： 在我的挥杆菜单中，我将按下标有团队名称的按钮，例如：
然后，将显示按下的相应团队按钮上的每个玩家的列表。
显示的播放器列表示例：
我很难理解如何使用这个Json文件来做这件事，我愿意使用任何完成工作所需的库，甚至重新格式化这个Json文件本身。
EXTRA：如果有人也可以解释导航数据的基础知识，以便将来我可以显示团队中每个玩家的所有数据（年龄，国籍......），这也很棒！ / p>
{
"Teams":
{
"FC Barcelona":{
"Bravo":{
"age" : "32",
"nationality" : "Chile",
"club" : "FC Barcelona",
"position": "Goalkeeper",
"overall" : "83"
},
"Montoya":{
"age" : "24",
"nationality" : "Spain",
"club" : "FC Barcelona",
"position" : "Defender",
"overall" : "77"
},
"Pique":{
"age" : "28",
"nationality" : "Spain",
"club" : "Barcelona",
"position" : "Defender",
"overall" : "84"
},
"Rakitic":{
"age" : "27",
"nationality" : "Croatia",
"club" : "Barcelona",
"position" : "Midfielder",
"overall" : "83"
},
"Busquets":{
"age" : "27",
"nationality" : "Spain",
"club" : "Barcelona",
"position" : "Midfielder",
"overall" : "86"
},
"Xavi":{
"age" : "35",
"nationality" : "Spain",
"club" : "Barcelona",
"position" : "Midfielder",
"overall" : "86"
},
"Iniesta":{
"age" : "31",
"nationality" : "Spain",
"club" : "Barcelona",
"position" : "Midfielder",
"overall" : ""
},
"Pedro":{
"age" : "28",
"nationality" : "Spain",
"club" : "Barcelona",
"position" : "Forward",
"overall" : "83"
},
"Suarez":{
"age" : "28",
"nationality" : "Uruguay",
"club" : "Barcelona",
"position" : "Forward",
"overall" : "89"
},
"Messi":{
"age" : "28",
"nationality" : "Argentina",
"club" : "Barcelona",
"position" : "Forward",
"overall" : "93"
},
"Neymar":{
"age" : "23",
"nationality" : "Brazil",
"club" : "Barcelona",
"position" : "Forward",
"overall" : "87"
}
}
}
}
答案 0 :(得分：0)
这可以帮助您理解迭代
public class JsonParseTest {
private static final String filePath = "E:\\testJson.json";
public static void main(String[] args) {
try {
// read the json file
FileReader reader = new FileReader(filePath);
JSONParser jsonParser = new JSONParser();
JSONObject jsonObject = (JSONObject) jsonParser.parse(reader);
// get a String from the JSON object
String firstName = (String) jsonObject.get("firstname");
System.out.println("The first name is: " + firstName);
// get a number from the JSON object
long id = (long) jsonObject.get("id");
System.out.println("The id is: " + id);
// get an array from the JSON object
JSONArray lang= (JSONArray) jsonObject.get("languages");
// take the elements of the json array
for(int i=0; i<lang.size(); i++){
System.out.println("The " + i + " element of the array: "+lang.get(i));
}
Iterator i = lang.iterator();
// take each value from the json array separately
while (i.hasNext()) {
JSONObject innerObj = (JSONObject) i.next();
System.out.println("language "+ innerObj.get("lang") +
" with level " + innerObj.get("knowledge"));
}
// handle a structure into the json object
JSONObject structure = (JSONObject) jsonObject.get("job");
System.out.println("Into job structure, name: " + structure.get("name"));
} catch (FileNotFoundException ex) {
ex.printStackTrace();
} catch (IOException ex) {
ex.printStackTrace();
} catch (ParseException ex) {
ex.printStackTrace();
} catch (NullPointerException ex) {
ex.printStackTrace();
}
}
}
这是json文件
{
"id": 1,
"firstname": "Katerina",
"languages": [
{ "lang":"en" , "knowledge":"proficient" },
{ "lang":"fr" , "knowledge":"advanced" },
]
"job":{
"site":"www.javacodegeeks.com",
"name":"Java Code Geeks",
}
}
答案 1 :(得分：0)
我创建了一个伪代码检查它。
try {
JSONObject root = new JSONObject("YOUR_JSON");
JSONObject team = root.getJSONObject("Teams").getJSONObject("FC Barcelona");
Iterator keys = team.keys();
//iterate each object
while (keys.hasNext()){
JSONObject obj = team.getJSONObject((String)keys.next());
String age = obj.getString("age");
}
} catch (JSONException e) {
e.printStackTrace();
}