java org.json.JSONException: JSONObject["ListeCar"] 未找到
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org.json.JSONException: JSONObject["ListeCar"] not found
提问by Nuno Dores
I want to read this JSON file with java using json library
我想使用 json 库用 java 读取这个 JSON 文件
"ListeCar": [
{
"id": "R",
"size": "2",
"Orientation": "Horizontal",
"Position": {
"Row": "2",
"Column": "0"
}
}
This is my java code :
这是我的java代码：
package rushhour;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.IOException;
import java.util.Iterator;
import org.json.*;
public class JsonClass {
public static void main(String[] args) throws IOException, JSONException {
try{
JSONObject obj = new JSONObject(new FileReader("C:\Users\Nuno\Desktop\School\clg-g41326\RushHourJson.json"));
JSONObject jsonObject = (JSONObject) obj;
JSONArray Liste = obj.getJSONArray("ListeCar");
String listeCar = Liste.getJSONObject(0).getString("id");
for (int i = 0; i <Liste.length(); i++) {
String id = Liste.getJSONObject(i).getString("id");
System.out.println(id);
String size = Liste.getJSONObject(i).getString("size");
System.out.println(size);
String Orientation = Liste.getJSONObject(i).getString("Orientation");
System.out.println(Orientation);
String Position = Liste.getJSONObject(i).getString("Position");
System.out.println(Position);
}
}catch(JSONException e){
e.printStackTrace();
}
}
}
I'm doing this in netbeans and it's kind a my first time using Json ! I want just to do a system.out from this little json code. I don't know why he's not finding the file that i put in the new JSONObjet ...
我在 netbeans 中这样做，这是我第一次使用 Json ！我只想从这个小小的 json 代码中做一个 system.out 。我不知道他为什么找不到我放在新 JSONObjet 中的文件...
回答by Abhishek
{
"ListeCar":[
{
"id":"R",
"size":"2",
"Orientation":"Horizontal",
"Position":{
"Row":"2",
"Column":"0"
}
}]
}
try placing this in your .json file your json is not valid... try placing it in this site to check for it's validity.... http://json.parser.online.fr/
尝试将其放入您的 .json 文件中，您的 json 无效...尝试将其放入此站点以检查其有效性.... http://json.parser.online.fr/
And the code for the correct output....
以及正确输出的代码......
public static void main(String[] args) throws IOException, JSONException, ParseException {
try {
JSONParser parser = new JSONParser();
Object obj = parser.parse(new FileReader("/home/Desktop/temp.json"));
JSONObject objJsonObject = new JSONObject(obj.toString());
System.out.println(objJsonObject);
JSONArray Liste = objJsonObject.getJSONArray("ListeCar");
String listeCar = Liste.getJSONObject(0).getString("id");
for (int i = 0; i < Liste.length(); i++) {
String id = Liste.getJSONObject(i).getString("id");
System.out.println(id);
String size = Liste.getJSONObject(i).getString("size");
System.out.println(size);
String Orientation = Liste.getJSONObject(i).getString("Orientation");
System.out.println(Orientation);
String Position = Liste.getJSONObject(i).getJSONObject("Position").toString();
System.out.println(Position);
}
} catch (JSONException e) {
e.printStackTrace();
}
}
You forgot to parse json... which is done in the above code.... a link about the tutorial on how to do this is as follows:: http://crunchify.com/how-to-read-json-object-from-file-in-java/
你忘了解析 json ......这是在上面的代码中完成的......关于如何做到这一点的教程的链接如下：http: //crunchify.com/how-to-read-json- java中的文件中的对象/
