I am trying to create the following JSON Structure dynamically
{
"items":
{
"Popcorn":
[
{
"name": "RegularPack"
},
{
"name": "Bucket"
}
],
"Chips":
[
{
"name": "HotChips"
},
{
"name": "UncleChips"
}
]
}
}
I have tried , but not sure of how to do that .
Could anybody please help me ??
import java.util.ArrayList;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
import org.json.JSONException;
public class TEST {
public static void main(String[] args) throws JSONException {
Map<String, ArrayList<String>> data = new HashMap<String, ArrayList<String>>();
ArrayList<String> popcornlist = new ArrayList<String>();
popcornlist.add("Regular Pack");
popcornlist.add("Bucket");
ArrayList<String> chipslist = new ArrayList<String>();
chipslist.add("HotChips");
chipslist.add("Uncle Chips");
data.put("Popcorn", popcornlist);
data.put("Chips", chipslist);
Iterator iterator=data.entrySet().iterator();
while(iterator.hasNext()){
Map.Entry e = ( Map.Entry ) iterator.next ( ) ;
System.out.println("key: "+e.getKey());
}
}
}
Could anybody please tell me where to Open the JSONObject and JSONArray ??
I am using org.json for this .
Please see the following link which indicates when to use JSONObject and JSONArray . It may be easier to send a java object back to the front end and use some client side code to parse it to a JSON object using GSON
Encoding JSON in Java
import org.json.simple.JSONObject;
class JsonEncodeDemo
{
public static void main(String[] args)
{
JSONObject obj = new JSONObject();
obj.put("name", "foo");
obj.put("num", new Integer(100));
obj.put("balance", new Double(1000.21));
obj.put("is_vip", new Boolean(true));
System.out.print(obj);
}
}
Output
{"balance": 1000.21, "num":100, "is_vip":true, "name":"foo"}
Decoding JSON in Java
import org.json.simple.JSONObject;
import org.json.simple.JSONArray;
import org.json.simple.parser.ParseException;
import org.json.simple.parser.JSONParser;
class JsonDecodeDemo
{
public static void main(String[] args)
{
JSONParser parser=new JSONParser();
String s = "[0,{\"1\":{\"2\":{\"3\":{\"4\":[5,{\"6\":7}]}}}}]";
try{
Object obj = parser.parse(s);
JSONArray array = (JSONArray)obj;
System.out.println("The 2nd element of array");
System.out.println(array.get(1));
System.out.println();
JSONObject obj2 = (JSONObject)array.get(1);
System.out.println("Field \"1\"");
System.out.println(obj2.get("1"));
s = "{}";
obj = parser.parse(s);
System.out.println(obj);
s= "[5,]";
obj = parser.parse(s);
System.out.println(obj);
s= "[5,,2]";
obj = parser.parse(s);
System.out.println(obj);
}catch(ParseException pe){
System.out.println("position: " + pe.getPosition());
System.out.println(pe);
}
}
}
Output
The 2nd element of array
{"1":{"2":{"3":{"4":[5,{"6":7}]}}}}
Field "1"
{"2":{"3":{"4":[5,{"6":7}]}}}
{}
[5]
[5,2]
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