Slide 5.3: Network connection (cont.)

Slide 5.2: Network connection (cont.)
Slide 5.4: Network connection (cont.)
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Network Connection (Cont.)

MIDP Connectivity
HTTP can either be implemented using IP protocols (such as TCP/IP) or non-IP protocols (such as WAP and i-mode), because the MIDP extends CLDC connectivity to provide support for a subset of the HTTP protocol. For network programming using MIDP, revert to the HTTP programming model, and the applications will run on any MIDP device, whether it is a GSM phone with a WAP stack, a phone with i-mode, or a Palm VII wireless.

The HttpConnection Interface
The HttpConnection interface is part of the package javax.microedition.io. It defines the necessary methods and constants for an HTTP connection:

   public interface HttpConnection
     extends javax.microedition.io.ContentConnection

The HTTP protocol is a request-response application protocol in which the parameters of the request must be set before the request is sent. The connection could be in one of the three following states:

Setup: No connection yet
Connected: Connection has been made, the request has been sent, and some response is expected.
Closed: Connection is closed.

In the Setup state, the following methods can be invoked:

   public void  setRequestMethod( String method )
   public void  setRequestProperty( String key, String value )

For example, suppose you have this connection:

   HttpConnection  c = ( HttpConnection )
     Connector.open( "http://java.sun.com/developer" );

Then, you can set the request method to be of type POST as follows:

   c.setRequestMethod( HttpConnection.POST );