Create and run a servlet example (Eclipse,GlassFish)

Servlet is a java based server side web technology to develop dynamic web resource programs . Basic requirements are given below to create and run a servlet example .

Softwares :

Java	(Download).
GlassFish server	(Download).
Eclipse	(Download).

Jar files:

javax.servlet.jar	(Download).
javax.servlet.jsp.jar	(Download).

Source files :

welcomeServlet.class(servlet)
web.xml

You can deploy the below Web application in any java supported Web/Application server (Like Tomcat , JBoss, WebSphere , Jetty , Weblogic,….).

Create and run a servlet example Directory Structure :

Create and run a servlet example Deployment : Right click on server , select Add and Remove , select the project and click finish button.

1. Web-client request comes to the Web-server , First it looks for the web application.If exists , it will search for url-pattern (/welcomeApp) in the web.xml from the WEB-INF folder.

2. Later it identifies the servlet-name (Logical Name) ,In our example it is ServletExe .

3. Next it checks for the exact match of the servlet-name (ServletExe) inside the <servlet> tag.

4. Next it checks the servlet-class (servletApp.welcomeServlet) .

5. Loads the servlet class (welcomeServlet.class) from WEB-INF/classes to the container.

6. The doGet() method will execute (see the Servlet Lifecycle).

7. Finally the response goes to the client window.

Example code to create and run a servlet :

Create and run the servlet example welcomeServlet.java

/*
 * Author : java2db.com
 */
package servletApp;

import java.io.IOException;
import java.io.PrintWriter;
import java.util.GregorianCalendar;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;


public class welcomeServlet extends HttpServlet {
    private static final long serialVersionUID = 1L;


    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        try
        {
        response.setContentType("text/html");
        PrintWriter writer =  response.getWriter();
        writer.println("<h2><font color=green>Welcome to the Servlet World...</font></h2>");
        writer.print("<font color=red>The local Date and time is :<font> "+new GregorianCalendar().getTime());
        writer.close();
        }
        catch(Exception exception)
        {
        exception.printStackTrace();    
        }
    }//End doGet
}//End class

* Author : java2db.com

package servletApp;

import java.io.IOException;

import java.io.PrintWriter;

import java.util.GregorianCalendar;

import javax.servlet.ServletException;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

public class welcomeServlet extends HttpServlet {

private static final long serialVersionUID = 1L;

protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

try

{

response.setContentType("text/html");

PrintWriter writer = response.getWriter();

writer.println("<h2><font color=green>Welcome to the Servlet World...</font></h2>");

writer.print("<font color=red>The local Date and time is :<font> "+new GregorianCalendar().getTime());

writer.close();

}

catch(Exception exception)

{

exception.printStackTrace();

}

}//End doGet

}//End class

Create and run the servlet example web.xml

 <?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">
  <servlet>
    <servlet-name>servletExe</servlet-name>
    <servlet-class>servletApp.welcomeServlet</servlet-class>
  </servlet>
  <servlet-mapping>
    <servlet-name>servletExe</servlet-name>
    <url-pattern>/welcomeApp</url-pattern>
  </servlet-mapping>
</web-app>

<?xml version="1.0" encoding="UTF-8"?>

<web-app xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">

<servlet-name>servletExe</servlet-name>

<servlet-class>servletApp.welcomeServlet</servlet-class>

</servlet>

<servlet-mapping>

<servlet-name>servletExe</servlet-name>

<url-pattern>/welcomeApp</url-pattern>

</servlet-mapping>

</web-app>

Create and run a servlet example URL to Run the Application :

http://localhost:8080/welcomeServletApp/welcomeApp

Create and run the servlet example http :- The Hypertext Transfer Protocol

Create and run the servlet example localhost :- Host name (if the server is located in a remote machine , use the IP(Ex :192.164.2.3) address).

Create and run the servlet example 8080 :- Port number of the server that can be hear the client requests.

Create and run the servlet example welcomeServletApp :- Deployed web application name.

Create and run the servlet example welcomeApp :- Url pattern of the servlet program (It is in web.xam).

Create and run the servlet example Execution Result

Comments

Palanikumar says:

November 3, 2015 at 10:36 am

please upload very very basic and small project like jsp+mysql , spring+mysql, Struts+mysql and so on. am very proud of your work

Reply

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Create and run a servlet example (Eclipse,GlassFish)

Example code to create and run a servlet :

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