Menu

Showing posts with label How to read a JSON. Show all posts
Showing posts with label How to read a JSON. Show all posts

Create JS Object from JSON text

How to traverse on JSON (JavaScript object notation) object using JavaScript and how to traverse JSON array using JavaScript?

 Below is the simple HTML and JavaScript based program, which have a JSON data object and further that json object have json array. Using JavaScript we will read that json data one by one and generate output for end user, and later that output we will show on html page.

 1
 2
 3
 4
 5
 6
 7
 8
 9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
<html>
<body>
<h2>Create JS Object from JSON String</h2>
 <p id="output">
 </p>
<script>
var txt = '{"employees":[' +
'{"firstName":"Rashid","lastName":"Jorvee" },' +
'{"firstName":"Java","lastName":"Script" },' +
'{"firstName":"Node","lastName":"JS" }]}';


var jsonData = JSON.parse(txt);
var output="";
for (var i = 0; i < jsonData.employees.length; i++) {
    var counter = jsonData.employees[i];
    console.log(counter.firstName);
    output += "First name: " +  counter.firstName +  ", Last Name: " +counter.lastName +"<br />";
 document.getElementById("output").innerHTML = output;
   
}

</script>
</body>
</html>

Output:

Create JS Object from JSON String

First name: Rashid, Last Name: Jorvee
First name: Java, Last Name: Script
First name: Node, Last Name: JS

Output on browser console: 

console output on browser debugger console
console output on browser debugger console

at No comments:
Labels: , , , ,

How to iterate on a JSON objects using Java

Today we are going to see how to iterate on a JSON object or read a JSON file and fetch key and value from that JSON file using Java.

 Below is the example code snippet.



 1
 2
 3
 4
 5
 6
 7
 8
 9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
package rashidjorvee;

import java.io.FileReader;

import org.json.simple.JSONArray;
import org.json.simple.JSONObject;
import org.json.simple.parser.JSONParser;
public class JsonReader {
 /* JSON data file
  * [
    {
      "componentName": "comp1""compKey": [
        {
          "keyname": "json_key1",
          "props": [
            {
              "fieldLabel": "Jorvee",
              "name": "./productProperty",
              "id": "productID",
              "sling:resourceType": "granite/ui/components/foundation/form/textfield"
            }
          ]
        }
      ]
    },
    {
      "componentName": "comp2""compKey": [
        {
          "keyname": "json_key2",
          "props": [
            {
              "fieldLabel": "Rashid",
              "name": "./productProperty",
              "id": "productID",
              "sling:resourceType": "foundation/components/parsys"
            }
          ]
        }
      ]
    }
  ]
  */
 public static void main(String[] args) {
  try{
   JSONParser parser=new JSONParser();
   JSONArray a = (JSONArray) parser.parse(new FileReader("D:\\json/jsonFile.json"));
   for (Object comp:a) {
    JSONObject key1 = (JSONObject) comp;
    String componentName = (String) key1.get("componentName");
    System.out.println("componentName: "+componentName);
    JSONArray compkeys = (JSONArray) key1.get("compKey");
    for (Object o : compkeys)
    {
     JSONObject key = (JSONObject) o;
     String keyName = (String) key.get("keyname");
     System.out.println("KeyName: "+keyName);
     
     JSONArray keys = (JSONArray) key.get("props");
     for (Object prop : keys) {
      JSONObject properties = (JSONObject) prop;
      
      String name = (String) properties.get("name");
      System.out.println("Name: " +name);
      
      String fieldLabel = (String) properties.get("fieldLabel");
      System.out.println("City: "+fieldLabel);
      
      String job = (String) properties.get("sling:resourceType");
      System.out.println("resourceType: "+job);
      
      String id = (String) properties.get("id");
      System.out.println("ID: "+id);
      
     }
     System.out.println("\n");
    }
   }
  } catch(Exception e) {}

 }

}
at No comments:
Labels: , , , ,
Subscribe to: Posts (Atom)