Re: GWT 2 Servlet

Build the RequestBuilder object in Client side. Implement the
RequestCallback interface in client side code, override the
onResponseReceived(), onError() method. Call the send() method in
RequestBuilder class, requestBuilder object call the service method in
servlet. Try the below code to talk to servlet.

//client side code

public class RequestBuilderTest implements RequestCallback
{
private RequestBuilder rb;
public RequestBuilderTest()
{
rb = new RequestBuilder(RequestBuilder.POST,"Your_servlet_name");
rb.setCallback(this);
Button send = new Button("Mail");
send.addClickHandler(new ClickHandler() {
@Override
public void onClick(ClickEvent event) {
try
{
rb.send();
}
catch(RequestException e)
{

}

}
});
RootLayoutPanel.get().add(send);
}

@Override
public void onError(Request request, Throwable exception)
{
Window.alert("Error received from servlet");
}
@Override
public void onResponseReceived(Request request, Response response)
{
Window.alert("Response received from servlet");
}

}

//server side code

public class TestServlet extends HttpServlet
{
private static final long serialVersionUID = 1L;
public void doPost(HttpServletRequest req, HttpServletResponse
resp)
{
try
{
int port =req.getRemotePort();
System.out.println("port :"+port);
}
catch (AddressException e1)
{
e1.printStackTrace();
}
}

// To edit web.xml in War directory

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE web-app
PUBLIC "-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN"
"http://java.sun.com/dtd/web-app_2_3.dtd">
<web-app>
<!-- Servlets -->
<servlet>
<servlet-name>SampleServlet</servlet-name>
<servlet-class>com.tan.server.TestServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>SampleServlet</servlet-name>
<url-pattern>/Your_servlet_name</url-pattern>
</servlet-mapping>
<!-- Default page to serve -->
<welcome-file-list>
<welcome-file>SampleGAE.html</welcome-file>
</welcome-file-list>
</web-app>

S. Abraham
www.DataStoreGwt.com
Persist objects directly in GAE

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