Re: GWT : How to call SERVLET FROM GWT_SERVLET and How to return value from target servlet to source servlet?

you can call a servlet from client side like this (may be you want put these code into AsyncCallback method body, from gwt servlet):

        btn.addClickHandler(new ClickHandler(){
            public void onClick(ClickEvent event) {
               final String link = GWT.getModuleBaseURL() + "someServlet?year="+year.getValue(year.getSelectedIndex())+"&month="+month.getValue(month.getSelectedIndex());
                RequestBuilder builder = new RequestBuilder(RequestBuilder.GET,link);
                try {
                    builder.sendRequest(null, new RequestCallback() {
                        @Override
                        public void onResponseReceived(Request request,
                                Response response) {
                            if (response.getStatusCode() == 200) {
                               // response.getText();
                             } else if (response.getStatusCode() == 404) {
                                Window.alert("Service not available.");
                            }
                        }
                        @Override
                        public void onError(Request request, Throwable exception) {
                            Window.alert("Service not available.");
                        }
                    });
                } catch (RequestException re) {
                    GWT.log("Error", re);
                }
            }
        });

---

From: vaibhav bhalke <bhalke.vaibhav@gmail.com>
To: google-web-toolkit@googlegroups.com
Sent: Wednesday, August 31, 2011 4:30 PM
Subject: GWT : How to call SERVLET FROM GWT_SERVLET and How to return value from target servlet to source servlet?

I have 2 servlets.

One In GWT module i.e BasicServiceImpl extends RemoteServiceServlet implements BasicMassUpdateService

and other servlet TargetServlet extends HttpServlet in TargetServlet in diff module/package com.comp.server.servlets

I am using GWT-RPC in my gwt module. I want to write one method getRecordList() in BasicServiceImpl which returns list of record on client side.(right now I am sending dummy data in record list)

In other servlet i.e TargetServlet RecordList formed from database value.

Use case: When we call getRecordList() method using rpc then I want to call SERVLET : TargetServlet to get recordlist, TargetServlet will return recordlist to getRecordList of Gwt_servlet and finally getRecordList() returns recordlist on client side

1: How to call other servlet(TargetServlet) from GWT_SERVLET i.e BasicServiceImpl

2: How to send recordlist from TargetServlet to getRecordList() of BasicServiceImpl(GWT SERVLET)

Any help or guidance in this matter would be appreciated

--
Best Regards,
Vaibhav





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