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Java EE 02-First Servlet

Java EE 02-First Servlet



How to create your first Java Servlet Using Eclipse and JBoss

How to create your first Java Servlet Using Eclipse and JBoss



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    Java EE 02-First Servlet Java EE 02-First Servlet Presentation Transcript

    • Introduction to Java Enterprise Edition Configuring JBoss within Eclipse  Write your first Servlet Fernando Gil lobho.gil@gmail.com Marzo 2012
    • Agenda How to configure JBoss AS within Eclipse in order to start the develop of JavaEE applications. Well write our first Servlet class. Well discuss the deployment descriptor.
    • JBoss AS 6.1 & Eclipse Indigo First download Eclipse IDE for Java Developers from: http://www.eclipse.org/downloads and JBoss 6.1 from: http://www.jboss.org/jbossas/downloads/ Open Eclipse. Create a New Server: Go to File/New/Other  Select Server Option  Search JBoss 6.x  Browse JBoss Home  Directory (the folder where you saved JBoss) Click Finish 
    • Important If you can not find JBoss 6.x in the servers list, try to Download additional server adapters:  Sometimes eclipse can not find the JBoss adapters, in that case check this video tutorial to solve the problem: Eclipse & JBoss AS 6
    • Dynamic Web Project Open Eclipse and select File/New/ Dynamic Web Project Set the Project Name and the location In Target Runtime we must select the runtime of JBoss 6.x The Dynamic web module version will be set automatically We can Click Finish
    • Creating our Servlet In order to keep the example simple, well create a servlet selecting File/New/Class and set the values like in the picture:
    • The Codepackage com.dss.tut;import java.io.*;import javax.servlet.*;import javax.servlet.http.*;public class FirstServlet extends HttpServlet { /* The service() method handles requests and creates responses. * The servlet container automatically calls this method when * it gets any request for this servlet.*/ public void service(HttpServletRequest req, HttpServletResponse resp) throws IOException, ServletException{ PrintWriter pw = resp.getWriter(); pw.println("<html>"); pw.println(" <head></head>"); pw.println(" <body>"); pw.println(" <h1>Hello! this is my firstServlet</h1>"); pw.println(" </body>"); pw.println("</html>"); }}
    • Deployment Descriptor We must indicate to the Application Server the configurations of our Servlets. The Deployment descriptor is a XML file to accomplish this task. We will talk more about this file later. By the moment we need to create a new file called web.xml in the directory: WebContent/WEB-INF of our project. <?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_3_0.xsd" id="WebApp_ID" version="3.0"> <servlet> <!-- Define our servlet indicating one name to identify it and the class which represent it including the package --> <servlet-name>First</servlet-name> <servlet-class>com.dss.tut.FirstServlet</servlet-class> </servlet> <servlet-mapping> <!-- Link one existent servlet with an url. Whit this we can specify the way we can access the Servlet by the browser--> <servlet-name>First</servlet-name> <url-pattern>/MyServlet</url-pattern> </servlet-mapping> </web-app>
    • Compilation and Deployment Now we just need to select our project, right click, Run As.., Run on Server, Select our JBoss Server and wait. Remember the url pattern that we specified in the deployment descriptor, because that is the way well access to the Servlet.
    • Next Lesson:JPS Technology Fernando Gil lobho.gil@gmail.com Marzo 2012