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

[vaibhav bhalke]

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

[Juan Pablo Gardella]

Modularize. You can have a service pojo object and invoque this in both servlets.

2011/8/31 vaibhav bhalke <bhalke....@gmail.com>

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[Abduxkur Ablimit]

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....@gmail.com>
To: google-we...@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?

[vaibhav gwt]

Thanks for reply
In your provided code , you are calling TargetServlet from client.
I want to call targetServlet from BasicServiceImpl(GWT Servlet).

On Sep 1, 6:41 am, Abduxkur Ablimit <sugar...@yahoo.com> wrote:
> 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.vaib...@gmail.com>

[Михаил Ольховский]

if you realy need to call http servlet, i think it will help you: http://hc.apache.org/

Basic HTTP POST example

but if GWT SERVLET and SERVLET are located on one server, it is better to use another communications mechanism

[Abduxkur Ablimit]

you can put those code in client side AsyncCallback method body, that mean AsyncCallback impl == BasicServiceImpl .

---

From: vaibhav gwt <bhalke....@gmail.com>
To: Google Web Toolkit <google-we...@googlegroups.com>
Sent: Friday, September 2, 2011 3:52 PM
Subject: Re: GWT : How to call SERVLET FROM GWT_SERVLET and How to return value from target servlet to source servlet?

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[Shraddha Sanap]

helllo,
can u please tell me how implement servlet in gwt project
My aim is:-
i want clients machines username.
but its returning server's userid.
now i am trying to implement servlet.
SO tell me how write code? how to call and execute

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