在Java中的json对象中添加json数组

Question

I am struggling to fit in a jsonArray inside a json object (through java code).. please help me out.

My Input JsonObject is :

{ 
   "products":{  
      "productId":"712161780324",
      "imageURL":"http:example.com/imageResource.jpg",
      "internalItemCode":"N08792 8W"
      }
}

I will have to read "imageURL" property from this JSONObject and append its variants to the same json object (image variants will be in SortedSet data structure).

Sample O/P 1 :

{  
   "products":{  
      "productId":"712161780324",
      "imageURL":"http:example.com/imageResource.jpg",
      "internalItemCode":"N08792 8W",
      "variants":[  
         "http:example.com/imageResource_variant1.jpg",
         "http:example.com/imageResource_variant2.jpg"
      ]
   }
}

Sample O/P 2 :

{  
   "products":{  
      "productId":"712161780324",
      "imageURL":"http:example.com/imageResource.jpg",
      "internalItemCode":"N08792 8W",
      "variants":[ 
            { 
             "url" : "http:example.com/imageResource_variant1.jpg"
            },
           {
            "url" : "http:example.com/imageResource_variant2.jpg"
           }
      ]
   }
}

The logic i tried to get sample output 2 is some what like below,

// productDetail is the give input JSONObject
    JSONObject product = productDetail.optJSONObject("products");
    SortedSet<String> imageUrls = new TreeSet<>(); 
    imageUrls.add("http:example.com/imageResource_variant1.jpg"); 
    imageUrls.add("http:example.com/imageResource_variant2.jpg"); 
    Iterator<String> itr = imageUrls.iterator();
    JSONArray imageUrlsArray = new JSONArray();
    while (itr.hasNext()) {
        JSONObject imageUrlObj = new JSONObject();
        imageUrlObj.put("url", itr.next());
        imageUrlsArray.put(imageUrlObj);
        }
    product.append("variants", imageUrlsArray);

When i tried to print the productDetail JSON object after executing above logic

System.out.println(productDetail.toString());

I observed the following output :

{  
   "products":{  
      "productId":"712161780324",
      "imageURL":"http:example.com/imageResource.jpg",
      "internalItemCode":"N08792 8W",
      "variants":[
           [ 
            { 
             "url" : "http:example.com/imageResource_variant1.jpg"
            },
           {
            "url" : "http:example.com/imageResource_variant2.jpg"
           }
      ]
     ]
   }
}

If you notice, It's coming up like Array of arrays (extra [ ] for "variants"), Please help me in understanding Where my logic is going wrong.

And also, Please help me getting the First sample out put.

Appreciate quick response..

Thanks, Rohit.

Answer 1

First sample can be archivable as simple as this:

    JSONObject product = productDetail.optJSONObject("products");
    JSONArray imageUrlsArray = new JSONArray();
    imageUrlsArray.put(0, "http:example.com/imageResource_variant1.jpg");
    imageUrlsArray.put(1, "http:example.com/imageResource_variant2.jpg");
    product.append("variants", imageUrlsArray);

Answer 2

Try using put instead of append :

 JSONObject product = productDetail.optJSONObject("products");
 SortedSet<String> imageUrls = new TreeSet<>(); 
 imageUrls.add("http:example.com/imageResource_variant1.jpg"); 
 imageUrls.add("http:example.com/imageResource_variant2.jpg"); 
 Iterator<String> itr = imageUrls.iterator();
 JSONArray imageUrlsArray = new JSONArray();
 while (itr.hasNext()) {
     JSONObject imageUrlObj = new JSONObject();
     imageUrlObj.put("url", itr.next());
     imageUrlsArray.put(imageUrlObj);
     }
-product.append("variants", imageUrlsArray);
+product.put("variants", imageUrlsArray);

From the docs :

Append values to the array under a key. If the key does not exist in the JSONObject, then the key is put in the JSONObject with its value being a JSONArray containing the value parameter. If the key was already associated with a JSONArray, then the value parameter is appended to it.