我是Java的新手 - 我正在尝试循环使用JSONArray创建一个“标签”，“值”数组。
JSONArray records = (JSONArray) sch.get("schData");
看起来像这样A）
{"emotional distress":4,"peer difficulties":6,"behavioural difficulties":8,"kind and helpful behaviour":8,"overall stress":32,"_sdqID":11,"hyperactivity and concentration":6}
我希望遍历此对象以创建以下结构
B）
"chart": [{
"label": "Overall Stress",
"value": 89
},{
"label": "Emotional Stress",
"value": 1
},{
"label": "Behavioural difficulties",
"value": 29
},{
"label": "hyperactivity and concetration",
"value": 89
},{
"label": "Getting along with others",
"value": 19
},{
"label": "Keen and helpful behaviour",
"value": 99
}]
-
因此，当我创建一个记录时，我想要对密钥进行标题化 - 而不是包含_sdqID元素。我该怎么做？
我可以尝试手动创建一些东西。
JSONObject row = new JSONObject();
row.put("label", "Emotional Distress");
row.put("value", ((JSONObject) records.get(i)).get("emotional distress"));
rowArray.add(row);
我尝试把它放在第二个循环中 - 但我开始在其中发现强制转换问题。所以我不确定这一步的最佳方法是什么。
for (int j = 0; j < ((JSONObject) records.get(i)).size(); j++) {
//code
}
答案 0 :(得分：0)
您可以直接获取JSON数组，然后循环访问它。
import org.json.*;
public class JsonIO {
public static void parseJson(StringBuffer sb){
// sb is the JSON string
JSONObject obj = new JSONObject(sb);
JSONArray arr = obj.getJSONArray("chart");
for (int i = 0; i< arr.length(); i++){
// loop through
System.out.println(arr.getJSONObject(i).getString("label")); // i.e
System.out.println(arr.getJSONObject(i).getString("value"));
}
}
}
其次，GSON lib。可以使用。您可以download。
public static void parseJson(String sb){
JsonParser jsonParser = new JsonParser();
JsonObject jo = (JsonObject)jsonParser.parse(sb);
JsonArray jArray = jo.getAsJsonArray("chart"); // get json array
Gson gJson = new Gson();
ArrayList jsonObjArrayList = gJson.fromJson(jArray, ArrayList.class);
for (int i = 0; i< jsonObjArrayList.size(); i++){
System.out.println(jsonObjArrayList.get(i).toString());
}
}
答案 1 :(得分：0)
public static void main(String[] args) {
// TODO Auto-generated method stub
JSONObject obj = new JSONObject();
obj.put("emotional distress", 4);
obj.put("peer difficulties", 6);
obj.put("behavioural difficulties", 9);
JSONArray array = new JSONArray();
for(String key : obj.keySet()) {
JSONObject newObj = new JSONObject();
newObj.put("label", key);
newObj.put("value", obj.get(key));
array.put(newObj);
}
System.out.println(array);
}
您的A对象在此obj，B为array。
答案 2 :(得分：0)
您可以使用此代码进行一些修改。我已将输出中的键更改为大写，您可以根据需要编写一些。
public static void main(String[] args) {
String data = "{\"emotional distress\":4,\"peer difficulties\":6,\"behavioural difficulties\":8,\"kind and helpful behaviour\":8,\"overall stress\":32,\"_sdqID\":11,\"hyperactivity and concentration\":6}";
JSONObject json = new JSONObject();
JSONArray chart = new JSONArray();
json.put("chart", chart);
JSONObject jsonObject = new JSONObject(data);
Iterator<String> iterator = jsonObject.keys();
while(iterator.hasNext()) {
String key = iterator.next();
if(key.equalsIgnoreCase("_sdqID")) {
continue;
}
int value = jsonObject.getInt(key);
key = key.toUpperCase();
JSONObject row = new JSONObject();
row.put("label", key);
row.put("value", value);
chart.put(row);
}
}
答案 3 :(得分：0)
好的，所以变量sch看起来像这样
{"schData":[{"emotional distress":4,"peer difficulties":6,"behavioural difficulties":8,"kind and helpful behaviour":8,"overall stress":32,"_sdqID":11,"hyperactivity and concentration":6},{"emotional distress":4,"peer difficulties":8,"behavioural difficulties":6,"kind and helpful behaviour":5,"overall stress":28,"_sdqID":10,"hyperactivity and concentration":5},{"emotional distress":4,"peer difficulties":8,"behavioural difficulties":6,"kind and helpful behaviour":5,"overall stress":28,"_sdqID":9,"hyperactivity and concentration":5},{"emotional distress":2,"peer difficulties":2,"behavioural difficulties":4,"kind and helpful behaviour":2,"overall stress":13,"_sdqID":8,"hyperactivity and concentration":3},{"emotional distress":5,"peer difficulties":6,"behavioural difficulties":8,"kind and helpful behaviour":7,"overall stress":32,"_sdqID":7,"hyperactivity and concentration":6},{"emotional distress":7,"peer difficulties":6,"behavioural difficulties":8,"kind and helpful behaviour":9,"overall stress":34,"_sdqID":6,"hyperactivity and concentration":4},{"emotional distress":5,"peer difficulties":4,"behavioural difficulties":4,"kind and helpful behaviour":6,"overall stress":21,"_sdqID":5,"hyperactivity and concentration":2},{"emotional distress":1,"peer difficulties":0,"behavioural difficulties":0,"kind and helpful behaviour":0,"overall stress":1,"_sdqID":4,"hyperactivity and concentration":0}]}
这是java代码
JSONArray data = new JSONArray();
//System.out.println("sch" + sch);
JSONArray records = (JSONArray) sch.get("schData");
for (int i = 0; i < records.size(); i++) {
//code
JSONObject chart = new JSONObject();
JSONObject obj = (JSONObject) records.get(i);
JSONArray rowArray = new JSONArray();
for (Object key : obj.keySet()) {
String keyStr = (String)key;
Object keyvalue = obj.get(keyStr);
//Print key and value
// System.out.println("key: "+ keyStr + " value: " + keyvalue);
JSONObject row = new JSONObject();
row.put("label", keyStr);
row.put("value", keyvalue);
rowArray.add(row);
}
chart.put("chart", rowArray);
JSONObject chartRecord = new JSONObject();
chartRecord.put("title", "xxx");
chartRecord.put("contents", chart);
data.add(chartRecord);
}
//System.out.println("chart data: "+ data);
---响应是这个
[{
"contents": {
"chart": [{
"label": "emotional distress",
"value": 4
}, {
"label": "peer difficulties",
"value": 6
}, {
"label": "behavioural difficulties",
"value": 8
}, {
"label": "kind and helpful behaviour",
"value": 8
}, {
"label": "overall stress",
"value": 32
}, {
"label": "_sdqID",
"value": 11
}, {
"label": "hyperactivity and concentration",
"value": 6
}]
},
"title": "xxx"
}, {
"contents": {
"chart": [{
"label": "emotional distress",
"value": 4
}, {
"label": "peer difficulties",
"value": 8
}, {
"label": "behavioural difficulties",
"value": 6
}, {
"label": "kind and helpful behaviour",
"value": 5
}, {
"label": "overall stress",
"value": 28
}, {
"label": "_sdqID",
"value": 10
}, {
"label": "hyperactivity and concentration",
"value": 5
}]
},
"title": "xxx"
}, {
"contents": {
"chart": [{
"label": "emotional distress",
"value": 4
}, {
"label": "peer difficulties",
"value": 8
}, {
"label": "behavioural difficulties",
"value": 6
}, {
"label": "kind and helpful behaviour",
"value": 5
}, {
"label": "overall stress",
"value": 28
}, {
"label": "_sdqID",
"value": 9
}, {
"label": "hyperactivity and concentration",
"value": 5
}]
},
"title": "xxx"
}, {
"contents": {
"chart": [{
"label": "emotional distress",
"value": 2
}, {
"label": "peer difficulties",
"value": 2
}, {
"label": "behavioural difficulties",
"value": 4
}, {
"label": "kind and helpful behaviour",
"value": 2
}, {
"label": "overall stress",
"value": 13
}, {
"label": "_sdqID",
"value": 8
}, {
"label": "hyperactivity and concentration",
"value": 3
}]
},
"title": "xxx"
}, {
"contents": {
"chart": [{
"label": "emotional distress",
"value": 5
}, {
"label": "peer difficulties",
"value": 6
}, {
"label": "behavioural difficulties",
"value": 8
}, {
"label": "kind and helpful behaviour",
"value": 7
}, {
"label": "overall stress",
"value": 32
}, {
"label": "_sdqID",
"value": 7
}, {
"label": "hyperactivity and concentration",
"value": 6
}]
},
"title": "xxx"
}, {
"contents": {
"chart": [{
"label": "emotional distress",
"value": 7
}, {
"label": "peer difficulties",
"value": 6
}, {
"label": "behavioural difficulties",
"value": 8
}, {
"label": "kind and helpful behaviour",
"value": 9
}, {
"label": "overall stress",
"value": 34
}, {
"label": "_sdqID",
"value": 6
}, {
"label": "hyperactivity and concentration",
"value": 4
}]
},
"title": "xxx"
}, {
"contents": {
"chart": [{
"label": "emotional distress",
"value": 5
}, {
"label": "peer difficulties",
"value": 4
}, {
"label": "behavioural difficulties",
"value": 4
}, {
"label": "kind and helpful behaviour",
"value": 6
}, {
"label": "overall stress",
"value": 21
}, {
"label": "_sdqID",
"value": 5
}, {
"label": "hyperactivity and concentration",
"value": 2
}]
},
"title": "xxx"
}, {
"contents": {
"chart": [{
"label": "emotional distress",
"value": 1
}, {
"label": "peer difficulties",
"value": 0
}, {
"label": "behavioural difficulties",
"value": 0
}, {
"label": "kind and helpful behaviour",
"value": 0
}, {
"label": "overall stress",
"value": 1
}, {
"label": "_sdqID",
"value": 4
}, {
"label": "hyperactivity and concentration",
"value": 0
}]
},
"title": "xxx"
}]