Hi again,
GAE don't allow to use FileWriter, but I need to write an XML file!
I noticed it from here:
http://code.google.com/intl/it-IT/appengine/docs/java/jrewhitelist.html
I can use the classes:
javax.xml.transform.Transformer
javax.xml.transform.dom.DOMSource
.....
that allow writing to an XML file
So I tried to do so:
CLIENT-SIDE:
MAIN:
....
RPCService rpc = new RPCService();
//rpc.testRPC(rooto, callback);
rpc.creaXML(nickname,pass,email2,gio,mes,ann,callback);
........
AsyncCallback callback = new AsyncCallback()
{
public void onFailure(Throwable caught)
{
Window.alert("Failure!");
}
public void onSuccess(Object result)
{
Window.alert("Success");
System.out.println((String)result);
}
};
....
-----------------------------------------------------------------------------------------------------------
package de.vogella.gwt.helloworld.client;
import com.google.gwt.user.client.rpc.RemoteService;
public interface MyService extends RemoteService {
//public String testRPC(String message);
public void creaXML(String nickname,String pass,String email2,String
gio,String mes, String ann);
}
---------------------------------------------------------------------------------------------------------
package de.vogella.gwt.helloworld.client;
import com.google.gwt.core.client.GWT;
import com.google.gwt.user.client.rpc.AsyncCallback;
import com.google.gwt.user.client.rpc.ServiceDefTarget;
public class RPCService implements MyServiceAsync {
MyServiceAsync service = (MyServiceAsync)
GWT.create(MyService.class);
ServiceDefTarget endpoint = (ServiceDefTarget) service;
public RPCService()
{
endpoint.setServiceEntryPoint(GWT.getModuleBaseURL() +
"rpc");
}
/*
public void testRPC(String message, AsyncCallback callback)
{
service.testRPC(message, callback);
}
*/
public void creaXML(String nickname,String pass,String
email2,String gio,String mes, String ann,AsyncCallback callback)
{
service.creaXML(nickname, pass, email2, gio, mes, ann,
callback);
}
}
------------------------------------------------------------------------------------------------------------
package de.vogella.gwt.helloworld.client;
import java.io.File;
import org.w3c.dom.Document;
import com.google.gwt.user.client.rpc.AsyncCallback;
public interface MyServiceAsync {
//void testRPC(String message, AsyncCallback<String> callback);
void creaXML(String nickname,String pass,String email2,String
gio,String mes, String ann,AsyncCallback<Void> callback);
}
------------------------------------------------------------------------------------------------------------
SERVER -SIDE:
package de.vogella.gwt.helloworld.server;
import java.io.*;
import org.w3c.dom.*;
import org.w3c.dom.Document;
import org.xml.sax.SAXException;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;
import javax.xml.transform.*;
import javax.xml.transform.dom.DOMSource;
import javax.xml.transform.stream.StreamResult;
import de.vogella.gwt.helloworld.client.MyService;
import com.google.gwt.user.server.rpc.RemoteServiceServlet;
public class MyServiceImpl extends RemoteServiceServlet implements
MyService {
public void creaXML(String nickname,String pass,String email2,String
gio,String mes, String ann){
/*
XML format (keywords are space delimited):
<utenti> <--già presente
<utente>
<nick>...</nick>
<psw>...</psw>
<mail>...</mail>
<datan>
<gg>...</gg>
<mm>...</mm>
<aa>...</aa>
</datan>
</utente>
</utenti>
*/
String dest = "utenti.xml";
Document doc = null;
DocumentBuilder db = null;
//Istanziazione di DocumentBuilderFactory
DocumentBuilderFactory dbf =
DocumentBuilderFactory.newInstance();
//Istanziazione di DocumentBuilder
try{
db = dbf.newDocumentBuilder();
}
catch(ParserConfigurationException pce){
System.err.println("Errore per DocumentBuilder");
}
try {
doc = db.parse("utenti.xml");
} catch (SAXException se) {
// TODO Auto-generated catch block
} catch (IOException ioe){
System.err.println(ioe);
}
Node root = doc.getDocumentElement(); //root=<utenti>
Node utente = doc.createElement("utente");
root.appendChild(utente);
Node nick = doc.createElement("nick");
Node Tnick = doc.createTextNode(nickname);
nick.appendChild(Tnick);
utente.appendChild(nick);
Node password = doc.createElement("psw");
Node Tpass = doc.createTextNode(pass);
password.appendChild(Tpass);
utente.appendChild(password);
Node email = doc.createElement("mail");
Node Tmail = doc.createTextNode(email2);
email.appendChild(Tmail);
utente.appendChild(email);
Node datan = doc.createElement("datan");
utente.appendChild(datan);
Node giorni = doc.createElement("gg");
Node Tgg = doc.createTextNode(gio);
giorni.appendChild(Tgg);
datan.appendChild(giorni);
Node mesi = doc.createElement("mm");
Node Tmm = doc.createTextNode(mes);
mesi.appendChild(Tmm);
datan.appendChild(mesi);
Node anni = doc.createElement("aa");
Node Taa = doc.createTextNode(ann);
anni.appendChild(Taa);
datan.appendChild(anni);
DOMSource sorgente = new DOMSource (doc);
StreamResult sr = new StreamResult (dest);
TransformerFactory tf =
TransformerFactory.newInstance();
Transformer transf;
try {
transf = tf.newTransformer();
} catch (TransformerConfigurationException tce)
{
System.out.println(tce.getMessage());
}
catch (TransformerException te)
{
System.out.println(te.getMessage());
}
}
-----------------------------------------------------------------------------------------------------------
module GWT:
<?xml version="1.0" encoding="UTF-8"?>
<module rename-to='de_vogella_gwt_helloworld'>
<!-- Inherit the core Web Toolkit stuff. -->
<inherits name='com.google.gwt.user.User'/>
<!-- Inherit the default GWT style sheet. You can change -->
<!-- the theme of your GWT application by uncommenting -->
<!-- any one of the following lines. -->
<inherits name='com.google.gwt.user.theme.standard.Standard'/>
<!-- <inherits name='com.google.gwt.user.theme.chrome.Chrome'/> -->
<!-- <inherits name='com.google.gwt.user.theme.dark.Dark'/> -->
<!-- Other module inherits -->
<inherits name='com.google.gwt.xml.XML'/>
<inherits name='com.google.gwt.http.HTTP'/>
<!-- Specify the app entry point class. -->
<entry-point class='de.vogella.gwt.helloworld.client.HelloGwt'/>
<!-- Specify the paths for translatable code -->
<source path='client'/>
<source path='shared'/>
<inherits name="com.google.gwt.search.Search"/>
<servlet path="/rpc"
class="de.vogella.gwt.helloworld.server.MyServiceImpl" />
</module>
-------------------------------------------------------------------------------------------------------------
WEB.XML
<?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 -->
<!-- Default page to serve -->
<welcome-file-list>
<welcome-file>De_vogella_gwt_helloworld.html</welcome-file>
</welcome-file-list>
<servlet>
<servlet-name>rPCImpl</servlet-name>
<servlet-class>de.vogella.gwt.helloworld.server.MyServiceImpl</
servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>rPCImpl</servlet-name>
<url-pattern>/de_vogella_gwt_helloworld/rpc</url-pattern>
</servlet-mapping>
</web-app>
-------------------------------------------------------------------------------------------------------------
Starting the application I got the following error:
[ERROR] javax.servlet.ServletContext log: Exception while dispatching
incoming RPC call
com.google.gwt.user.server.rpc.UnexpectedException: Service method
'public abstract void
de.vogella.gwt.helloworld.client.MyService.creaXML (java.lang.String,
java.lang.String, java.lang. String, java.lang.String,
java.lang.String, java.lang.String) 'Threw an unexpected exception:
javax.xml.transform.TransformerFactoryConfigurationError: Provider not
found org.apache.xalan.processor.TransformerFactoryImpl
at com.google.gwt.user.server.rpc.RPC.encodeResponseForFailure
(RPC.java: 378)
....
What does this mean?
Okay still do so?
Thanks to all
Sebe
On Jan 3, 11:41 pm, "a...@mechnicality.com" <a...@mechnicality.com>
wrote:
> On 1/3/2011 2:29 PM, A. Stevko wrote:> Can you use
> com.google.appengine.api.datastore.Text ?
> > |Text| wraps around a string of unlimited size.
> >http://code.google.com/appengine/docs/java/javadoc/com/google/appengi...
>
> Nope - its 3D vertex and animation data - basically integer and floating
> point binary values. The
> whole point of putting it in a blobstore is to avoid having lots of
> complicated code on the client
> to parse and process the data. The server processes it, caches it, and makes
> it available via a
> URN-based keying system.
>
> One possible option is to binhex it, I suppose, but that isn't very
> attractive, requiring an extra
> processing step on the client. I think I'll just stick to using Amazon EC2
> for my web services!
> Thanks for the suggestions, however.
>
> Regards
>
> Alan
>
>
>
>
>
> > On Mon, Jan 3, 2011 at 2:12 PM, a...@mechnicality.com
> > <mailto:a...@mechnicality.com>
> > <a...@mechnicality.com <mailto:a...@mechnicality.com>> wrote:
>
> > On 1/3/2011 2:05 PM, Matthew Hill wrote:
> >> Can't you store it in the DB? --
>
> > According to the GAE docs:
>
> > maximum entity size 1 megabyte
>
> > Most of my entities *start* at 1 MB and go up to maybe 500+ (its 3D
> > data)
>
> > So, I assumed that, no, I couldn't store it in the DB :-)
>
> > Alan
>
> >> You received this message because you are subscribed to the Google
> >> Groups "Google Web
> >> Toolkit" group.
> >> To post to this group, send email to
> >> google-web-toolkit@googlegroups.com
> >> <mailto:google-web-toolkit@googlegroups.com>.
> >> To unsubscribe from this group, send email to
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> >> <mailto:google-web-toolkit+unsubscr...@googlegroups.com>.
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>
> > --
> > You received this message because you are subscribed to the Google
> > Groups "Google Web Toolkit"
> > group.
> > To post to this group, send email to google-web-toolkit@googlegroups.com
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>
> > --
> > -- A. Stevko
> > ===========
> > "If everything seems under control, you're just not going fast enough." M.
> > Andretti
>
> > --
> > You received this message because you are subscribed to the Google Groups
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>
> --
> Alan Chaney
> CTO and Founder, Mechnicality, Inc.www.mechnicality.com
--
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