Re: How to get list of objects from JSON ??

On 26 oct, 15:38, Santosh kumar <kopp....@gmail.com> wrote:
> Hi ,
>
> Moitra and Thomas
>
> Thanks for your reply.. !!
>
> Anyways i got a solution..
>
> *use this code in the servlet* ---
> - get the list of products (productList) and use it in the servlet:
> - This is JSON format to form a array of objects
>
>         // Open the <script> tag
>         writer.append("<script type=\"text/javascript\">");
>         writer.append("var product=");
>         writer.append("{productList: '[");
>
>         Iterator<Product> iter = productList.iterator();
>         while (iter.hasNext()) {
>             Product product= iter.next();
>             writer.append("{productName: \"" + Product .getProductName() +
>                     "\", id: " + Product .getId() +
>                     ", productDetails: \"" + Product .getProductDetails() +
>                        .................................
>                        .................................
>                       "\"}");
>             if (iter.hasNext()) {
>                 writer.append(",");
>             }
>         }
>
>         // End the <script> tag
>         writer.append("]'}; </script>");
>
> *use this code in the GWT onModule *---
> - call the above servlet on onModule
>
>         Dictionary product= Dictionary.getDictionary("product");
>         String productListStr = product.get("productList").toString();
>         JSONArray productJSONArray = JSONParser.parse(productListStr
> ).isArray();
>         List<Product> ProductList = new ArrayList<Product>();
>         for (int i = 0; i < productJSONArray .size(); i++) {
>             JSONObject productJSONObject = (JSONObject)productJSONArray
> .get(i);
>             Product product= new Product();
>
>             JSONString productNameJSONString = productJSONObject
> .get("productName").isString();
>             product.setProductName(productNameJSONString .stringValue());
>
>             product.setId(Long.valueOf(productJSONObject
> .get("id").toString()));
>
>             .........................
>             .........................
>
>             ProductList .add(product);
>         }
>
> finally we will get a list of objects. i.e, ProductList .
>
> Guys its really cool concept .. !! enjoy it !! :-)

Rewritten using overlay types:
public final class Product extends JavaScriptObject {
protected Product() { /* required for overlay types */ }

public native String getProductName() /*-{ return
this.productName; }-*/;

public native String getId() /*-{ return this.id; }-*/;
}

...

public native JsArray<Product> getProductList() /*-{ return
$wnd.product.productList; }-*/;

...

JsArray<Product> productList = getProductList();

Of course, if your really want Product as a "real" bean, and a List<?>
instead of a JsArray<?>, you can copy things around (see below); but
really I believe overlay types are much more readable than anything
using com.google.gwt.json.* classes.

// renaming the above overlay type to ProductJSO, and using your
Product bean class:
List<Product> productList = new ArrayList<Product>();
JsArray<ProductJSO> products = getProductList();
for (int i = 0, l = products.getLength(); i < l; i++) {
ProductJSO jso = products.get(i);
Product p = new Product();
p.setProductName(jso.getProductName());
p.setId(jso.getId());
products.add(p);
}

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