JAVA EE: Servlets : Servlet Interface

Sunday, 23 March 2014

Servlets : Servlet Interface

Click here to watch in Youtube : https://www.youtube.com/watch?v=X9AheaJGMBI

Click the below Image to Enlarge

Servlet Interface

ServletInterface Project Dir Structure

Servlet Interface

FirstServlet.java

import java.io.IOException;
import java.io.PrintWriter;

import javax.servlet.Servlet;
import javax.servlet.ServletConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;

public class FirstServlet implements Servlet
{
  ServletConfig config = null;

  public void init( ServletConfig config )
  {
    this.config = config;
    System.out.println("-----------------------------------------------------");
    System.out.println("init method has been called and servlet is initialized");
    System.out.println("-----------------------------------------------------");
  }

  public void service( ServletRequest req, ServletResponse res ) throws IOException, ServletException
  {
    System.out.println("-----------------------------------------------------");
    System.out.println("service method has been called");
    System.out.println("-----------------------------------------------------");

    res.setContentType("text/html");

    PrintWriter out = res.getWriter();
    out.print("<html><body>");
    out.print("<b>hello simple servlet</b>");
    out.print("<br>");
    out.print("<b>Servlet Info :</b> "+getServletInfo());
    out.print("<br>");
    out.print("<b>Get Servlet config object :</b> "+getServletConfig());
    
    out.print("</body></html>");

  }

  public void destroy()
  {
    System.out.println("-----------------------------------------------------");
    System.out.println("destroy method has been called and servlet is destroyed");
    System.out.println("-----------------------------------------------------");
  }

  public ServletConfig getServletConfig()
  {
    return config;
  }

  public String getServletInfo()
  {
    return "copyright 2014-01-01 version : 3.0";
  }

}

Web.xml

<?xml version="1.0" encoding="ISO-8859-1"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 xmlns="http://java.sun.com/xml/ns/javaee"
 xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"
 metadata-complete="true" version="3.0">
 <display-name>Servlet Interface</display-name>
 <description>
        This is a simple web application with a source code organization
        based on the recommendations of the Application Developer's Guide.
    </description>
 <servlet>
  <servlet-name>FirstServlet</servlet-name>
  <servlet-class>FirstServlet</servlet-class>

 </servlet>
 <servlet-mapping>
  <servlet-name>FirstServlet</servlet-name>
  <url-pattern>/firstServlet</url-pattern>
 </servlet-mapping>

</web-app>

index.html

<!DOCTYPE HTML><html lang="en"><head>
<meta charset="UTF-8">
<title>ServletInterface</title>
</head>
<body>
<p>
<h3>ServletInterface</H3>
<p></p>
<ul>

<li><a href="firstServlet">FirstServlet</a></li>

</ul>
</body></html>

Environment Used:

JDK version :1.6.0_30
Tomcat version : 7.0.50

To Download ServletInterfaceApp Project Click the below link

https://sites.google.com/site/javaee4321/servlets/ServletInterfaceApp.zip?attredirects=0&d=1

See also:

Servlets Tutorial

All Design Patterns Links