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Answer to Question #69798 in Java | JSP | JSF for Pratik Kadam

Question #69798
What are Applets and Servlets in Java? Explain with Example
Expert's answer
Answer:
Java applet - an application program, most often written in the Java programming language in the form of bytecode. Java applets are executed in a web browser using a virtual Java machine (JVM), or Apple's AppletViewer, a standalone applet testing tool.
The <applet> tag is the basis for embedding an applet in an HTML file. Following is an example that invokes the "Hello, World" applet −
<html>
<title>The Hello, World Applet</title>
<hr>
<applet code = "HelloWorldApplet.class" width = "320" height = "120">
If your browser was Java-enabled, a "Hello, World"
message would appear here.
</applet>
<hr>
</html>
Information taken from this page - https://www.tutorialspoint.com/java/java_applet_basics.htm

The servlet is a Java interface, the implementation of which expands the functionality of the server. The servlet interacts with clients through the request-response principle.
Although servlets can serve any requests, they are used to extend Web servers. For such applications, Java Servlet technology defines HTTP-specific servlet classes.
The javax.servlet and javax.servlet.http packages provide interfaces and classes for creating servlets.
Following is the sample source code structure of a servlet example to show Hello World −
// 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.
}
}

Information taken from this page - https://www.tutorialspoint.com/servlets/servlets-first-example.htm

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