GWT (Client) = How to convert an object to JSON and send it to the server?

Question

I know that GWT has good RPC support. But for various purposes I need to build this myself:

1.) How to convert a Bean (on the client side), for example:

class MyPerson { String name; String getName(); void setName(String name); //.. } 

from gwt to json string? (Ideally use only those libraries that are officially included in GWT / Google).

2.) Secondly, how can I send this generated JSON string from the client side to any server using any GWT Client Logik. (Ideally use only those libraries that are officially included in GWT / Google).

I searched a lot, but the examples never show how to send data, but only to receive JSON data.

Many thanks!!! Jens

Answer 1

There's a great class called AutoBeanFactory that GWT will create for you, no third-party libraries are required. See http://google-web-toolkit.googlecode.com/svn-history/r9219/javadoc/2.1/com/google/gwt/editor/client/AutoBeanFactory.html

Once you have AutoBeanFactory, you can use it as follows:

creating JSON from an object of type SimpleInterface

 AutoBean<SimpleInterface> bean = beanFactory.create(SimpleInterface.class, simpleInterfaceInstance); String requestData = AutoBeanCodex.encode(bean).getPayload(); useRequestBuilderToSendRequestWhereverYouWant(requestData); 

parsing JSON from an object of type SimpleInterface

 SimpleInterface simpleInterfaceInstance = AutoBeanCodex.decode(beanFactory, SimpleInterface.class, responseText).as(); 

You can use RequestBuilder to send these requests without GWT-RPC or RF material.

Answer 2

I recommend that you use RestyGWT , which makes JSON services work the same as GWT RPC services.

Answer 3

Take a look at the GWT AutoBean framework, which you can use to create and retrieve useful JSON data. The RequestBuilder type can be used to send HTTP requests to the server.

Answer 4

You have another solution that is a third-party solution, perhaps a second solution, but it can also be the first. The third party is called GSON, and it is an open source project in Google code. You can find it here .

I used it, and it is very good and very simple.