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Learning Scala : Hello World Web App with SBT

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Chee Seng Chua

Posts: 62
Nickname: quai83
Registered: Nov, 2006

Chee Seng Chua is Senior Application Developer for KZEN Solutions Berhad

Learning Scala : Hello World Web App with SBT

Posted: May 7, 2011 7:42 AM

This post originated from an RSS feed registered with Web Buzz by Chee Seng Chua.
Original Post: Learning Scala : Hello World Web App with SBT Feed Title: Chee Seng Tech Blog Feed URL: http://chuacheeseng.blogspot.com/atom.xml Feed Description: When you think you are superior, you are being an idiot...	Latest Web Buzz Posts Latest Web Buzz Posts by Chee Seng Chua Latest Posts From Chee Seng Tech Blog

Creating Project:-


mkdir HelloWorld
cd HelloWorld
sbt

You will be prompted to create new project, type 'y' and enter project name, organization, version etc.:-


Name: HelloWorld 
Organization: QQ Enterprise
Version [1.0]: 
Scala version [2.8.1]: 
sbt version [0.7.5]:

Required Scala libraries will be downloaded automatically, make sure you are connected to internet.

Create WebAppBuild.scala build in project/build/ (create build directory if it's not there):-


import sbt._
class WebAppBuild(info: ProjectInfo) extends DefaultWebProject(info) {
    val jetty6 = "org.mortbay.jetty" % "jetty" % "6.1.14" % "test" 
    val servletApi = "javax.servlet" % "servlet-api" % "2.5"
}

In the SBT console, enter:-


reload
update

Create HelloWorldServlet.scala in src/main/scala directory:-


import javax.servlet.http._
class HelloWorldServlet extends HttpServlet {
    override def doGet(req: HttpServletRequest, resp: HttpServletResponse) = {
        resp.getWriter().print("Hello World!")
    }
}

Create webapp directory in src/main, and consequently create WEB-INF directory and web.xml:-


<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE web-app
PUBLIC "-//Sun Microsystems, Inc.//DTD Web Application 2.2//EN"
"http://java.sun.com/j2ee/dtds/web-app_2_2.dtd">
<web-app>
 
   <servlet>
      <servlet-name>HelloWorld</servlet-name>
      <servlet-class>HelloWorldServlet</servlet-class>
   </servlet>
 
   <servlet-mapping>
      <servlet-name>HelloWorld</servlet-name>
      <url-pattern>/HelloWorld</url-pattern>
   </servlet-mapping>
</web-app>

In SBT, run:-


reload
jetty-run

Open your web browser and go to http://localhost:8080, you should see the Hello World! message being print out from your simple servlet written in Scala.

Read: Learning Scala : Hello World Web App with SBT

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