Question

我想从json对象获取密钥。我使用下面的代码来获取它，

JSONParser parser = new JSONParser();
   try {

                Object obj = null;
                try {
                    obj = parser.parse(new FileReader(new File("json/customer_list.json")));
                } catch (org.json.simple.parser.ParseException e1) {
                    e1.printStackTrace();
                }
                JSONObject jsonObject = (JSONObject) obj;
                JSONArray listOfBranches = (JSONArray) jsonObject.get("customers");
                for (int i = 0; i < listOfBranches.size(); i++) {
                    System.out.println("Customer :" + listOfBranches.get(i));
                }
            } catch (FileNotFoundException e) {
                e.printStackTrace();
            } catch (IOException e) {
                e.printStackTrace();
            }

在这部分中，

System.out.println（＆＃34;客户：＆＃34; + listOfBranches.get（i））;

我得到了下面的对象，

{"Photo":{"input_required":false,"output_type":"","input_fields":[{"input_type":"INTEGER","length":"","reg_exp":"","label":"","field_type":"TEXT"},{"values":"","length":"","reg_exp":"","label":"Mode","field_type":"drop_down"},{"length":"","input_type":"INTEGER","reg_exp":"","label":"Quantity","field_type":"TEXT"}]},"video":{"input_required":true,"output_type":"","input_pattern":""},"drawing":{"input_required":true,"output_type":"PDF","input_pattern":""}}

从这个json我想得到照片，视频和绘图的关键。你能建议我这么做吗？提前谢谢。

Answer 1

我使用下面的代码

从json对象获取密钥

try {

            Object obj = null;
            try {
                obj = parser.parse(new FileReader(new File("json/customer_list.json")));
            } catch (org.json.simple.parser.ParseException e1) {
                e1.printStackTrace();
            }
            JSONObject jsonObject = (JSONObject) obj;
            JSONArray listOfBranches = (JSONArray) jsonObject.get("customers");
            for (int i = 0; i < listOfBranches.size(); i++) {
                JSONObject item = (JSONObject)listOfBranches.get(i);
                Set keys = item.keySet();
                Iterator a = keys.iterator();
                while(a.hasNext()) {
                    String key = (String)a.next();
                    System.out.print("key : "+key);
                }
                System.out.println("Customer :" + listOfBranches.get(i)+"\n item "+item);
            }
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }

快乐编码......

无法从java中的JSONObject获取密钥

1 个答案: