Prerequisite: Servlets and Applets
Applets | Servlets |
---|---|
A Java applet is a small application which is written in Java and delivered to users in the form of bytecode. | A servlet is a Java programming language class used to extend the capabilities of a server. |
Applets are executed on client side. | Servlets are executed on server side. |
Applets are used to provide interactive features to web applications that cannot be provided by HTML alone like capture mouse input etc. | Servlets are the Java counterpart to other dynamic Web content technologies such as PHP and ASP.NET. |
Life cycle of Applets init(), stop(), paint(), start(), destroy(). | Lifecycle of servlets are:- init( ), service( ), and destroy( ). |
Packages available in Applets are :- import java.applet.*; and import java.awt.*. | Packages available in servlets are:- import javax.servlet.*; and import java.servlet.http.*; |
Applets use user interface classes like AWT and Swing. | No User interface required. |
Applets are more prone to risk as it is on the client machine. | Servlets are under the server security. |
Applets utilize more network bandwidth as it executes on the client machine. | Servlets are executed on the servers and hence require less bandwidth. |
Requires java compatible browser for execution. | It accepts input from browser and generates response in the form of HTML Page, Javascript Object, Applets etc. |
Applets are two types 1.) Untrusted Applets 2.) trusted Applets | Servlet are two types 1.) Generic Servlet 2.) HTTP Servlet |
Applets is a part of JSE(JAVA Standard Edition) Modules. | Servlet is a part of JEE(Java Enterprise Edition ) Modules. |
Examples:
- Creating “hello world” Applet.
Java
// A Hello World Applet // Save file as HelloWorld.java import java.applet.Applet;
import java.awt.Graphics;
// HelloWorld class extends Applet public class HelloWorld extends Applet {
// Overriding paint() method
@Override
public void paint(Graphics g)
{
g.drawString("Hello World", 20 , 20 );
}
} |
- Creating “hello world” Servlet.
Java
// Import required java libraries import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;
// Extend HttpServlet class public class HelloWorld extends HttpServlet {
private String message;
public void init() throws ServletException
{
// Do required initialization
message = "Hello World";
}
public void doGet(HttpServletRequest request,
HttpServletResponse response)
throws ServletException, IOException
{
// Set response content type
response.setContentType("text/html");
// Actual logic goes here.
PrintWriter out = response.getWriter();
out.println("<h1>" + message + "</h1>");
}
public void destroy()
{
// do nothing.
}
} |
Article Tags :
Recommended Articles