1 import java.util.ArrayList;
 2 import java.util.HashMap;
 3 import java.util.List;
 4 
 5 import net.sf.json.JSONArray;
 6 import net.sf.json.JSONObject;
 7 
 8 public class testJSON {
 9     public static void main(String[] args) {
10         // TODO Auto-generated method stub
11         HashMap<String, String> map;
12         List<HashMap<String, String>> list = new ArrayList<HashMap<String, String>>();
13         for (int i = 1; i < 4; i++) {
14             map = new HashMap<String, String>();
15             map.put("unique_id", "" + i);
16             list.add(map);
17         }
18         testJSON test = new testJSON();
19         test.readJSON(test.createJSON(list));
20     }
21 
22     private JSONObject createJSON(List<HashMap<String, String>> list) {
23         JSONObject object = new JSONObject();
24         JSONArray array = new JSONArray();
25         array = JSONArray.fromObject(list);
26 
27         object.put("patinent_id", "111111111");
28         object.put("visit_id", 1);
29         object.put("file", array);
30         System.out.println("object‘s content----" + object.toString());
31         return object;
32     }
33 
34     private void readJSON(JSONObject object) {
35         System.out.println("patinent_id------>"
36                 + object.getString("patinent_id"));
37         System.out.println("visit_id------>" + object.getInt("visit_id"));
38         JSONArray array = object.getJSONArray("file");
39         System.out.println("These are unique_id:");
40         for (int i = 0; i < array.size(); i++) {
41             JSONObject arrObject = array.getJSONObject(i);
42             System.out.println("unique_id is "
43                     + arrObject.getString("unique_id"));
44         }
45     }
46 
47 }