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Google App Engine Hello world

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In this article,I am going to show how to deploy J2EE Google Web Application in Google App Engine

 Step 1: Install Google App Engine in Eclipse Market Place.

Step 2: Create Google Web Application in Eclipse and Create  Google Web Application Name from Google App Engine Dashboard Page https://appengine.google.com/

Screen Shots


Project Folder Explorer Screen Shot
 


App Engine Xml Configuration
<?xml version="1.0" encoding="utf-8"?>
<appengine-web-app xmlns="http://appengine.google.com/ns/1.0">
  <application>jspexample123</application>
  <version>1</version>

  <!--
    Allows App Engine to send multiple requests to one instance in parallel:
  -->
  <threadsafe>true</threadsafe>

  <!-- Configure java.util.logging -->
  <system-properties>
    <property name="java.util.logging.config.file" value="WEB-INF/logging.properties"/>
  </system-properties>

  <!--
    HTTP Sessions are disabled by default. To enable HTTP sessions specify:

      <sessions-enabled>true</sessions-enabled>

    It's possible to reduce request latency by configuring your application to
    asynchronously write HTTP session data to the datastore:

      <async-session-persistence enabled="true" />

    With this feature enabled, there is a very small chance your app will see
    stale session data. For details, see
    http://code.google.com/appengine/docs/java/config/appconfig.html#Enabling_Sessions
  -->

</appengine-web-app>

Here,

<application>jspexample123</application>
  Web application has to be given the same name that I have given in the Google App Engine page 

In Web.xml
<?xml version="1.0" encoding="utf-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns="http://java.sun.com/xml/ns/javaee"
xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee
http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" version="2.5">
<servlet>
<servlet-name>JspExampleinGAE</servlet-name>
<servlet-class>com.kumaran.jsp.JspExampleinGAEServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>JspExampleinGAE</servlet-name>
<url-pattern>/jspexampleingae</url-pattern>
</servlet-mapping>
<welcome-file-list>
<welcome-file>index.html</welcome-file>
</welcome-file-list>
</web-app>

Servlet Coding

package com.kumaran.jsp;

import java.io.IOException;
import javax.servlet.http.*;

@SuppressWarnings("serial")
public class JspExampleinGAEServlet extends HttpServlet {
public void doGet(HttpServletRequest req, HttpServletResponse resp)
throws IOException {
resp.setContentType("text/html");
resp.getWriter().println("<h1>Hello, world<h1>");
}
}


Html Page

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<!-- The HTML 4.01 Transitional DOCTYPE declaration-->
<!-- above set at the top of the file will set     -->
<!-- the browser's rendering engine into           -->
<!-- "Quirks Mode". Replacing this declaration     -->
<!-- with a "Standards Mode" doctype is supported, -->
<!-- but may lead to some differences in layout.   -->

<html>
  <head>
    <meta http-equiv="content-type" content="text/html; charset=UTF-8">
    <title>Hello App Engine</title>
  </head>

  <body>
    <h1>Hello App Engine!</h1>
    <table>
      <tr>
        <td colspan="2" style="font-weight:bold;">Available Servlets:</td>        
      </tr>
      <tr>
        <td><a href="jspexampleingae">JspExampleinGAE</a></td>
      </tr>
    </table>
  </body>
</html>


Deploy this web application into google app engine







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