HelloWorld.scala

package org.rockcoder.gae;

import java.io._
import javax.servlet.http._
import javax.servlet._

import com.google.appengine.api.datastore._

import com.google.appengine.tools.development.ApiProxyLocalImpl;
import com.google.apphosting.api.ApiProxy;

class TestEnvironment extends ApiProxy.Environment {

    def getAppId() = "Unit Tests"
    def getVersionId() = "1.0"
    def setDefaultNamespace(s: String) = {}
    def getRequestNamespace() = null
    def getDefaultNamespace() = null
    def getAuthDomain() = null
    def isLoggedIn() = false
    def getEmail() = null
    def isAdmin() = false
}

import scala.collection.jcl._
import com.google.appengine.api.datastore.FetchOptions.Builder._

class HelloWorld extends HttpServlet {

    override def init(config: ServletConfig) {

        ApiProxy.setEnvironmentForCurrentThread(new TestEnvironment());
        ApiProxy.setDelegate(new ApiProxyLocalImpl(new File(".")){});
    }

    override def doGet(req: HttpServletRequest , resp: HttpServletResponse ) {

        resp.setContentType("text/html");

        var form = <form method="post">
            <input type="text" name="name" />
            <input type="submit" value="create entity" />
        </form>

        resp.getWriter().println(form.toString);

        //val key = KeyFactory.stringToKey("agpVbml0IFRlc3Rzcg0LEgdjb250YWN0GAIM")

        // Get a handle on the datastore itself
        val datastore = DatastoreServiceFactory.getDatastoreService();

        // Lookup data by known key name
        //val entity = datastore.get(key);

        val pquery = datastore.prepare(new Query("contact"))

        val list = new BufferWrapper[Entity] {
            override def underlying = pquery.asList(withLimit(5))
        }

        var ul = <ul>
            { list.flatMap(li => <li>{ KeyFactory.keyToString(li.getKey) +": "+  li.getProperty("name") }</li>) }
        </ul>

        resp.getWriter().println("<div>"+ul.toString+"</div>");
    }

    override def doPost(req: HttpServletRequest , resp: HttpServletResponse ) {

        val name = req.getParameter("name")

        val datastore = DatastoreServiceFactory.getDatastoreService();

        val entity = new Entity("contact")

            entity.setProperty("name", name)

        val key = datastore.put(entity)

        resp.sendRedirect("/HelloWorld.html")
    }
}