Hello World: Command Line

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Hello World: Command Line

Hello World: Command Line

This example contains an HTML file and a servlet class:

index.html

<!DOCTYPE html>
<html>
  <head>
    <title>Server Hello World: Command Line</title>
  </head>
  <body>
    <h1>Happy Coding</h1>
    <p>Hello world!</p>
  </body>
</html>

/WEB-INF/classes/io/happycoding/servlets/HelloWorldServlet.java

package io.happycoding.servlets;

import java.io.IOException;

import jakarta.servlet.annotation.WebServlet;
import jakarta.servlet.http.HttpServlet;
import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpServletResponse;

@WebServlet("/hello")
public class HelloWorldServlet extends HttpServlet {

  @Override
  public void doGet(HttpServletRequest request, HttpServletResponse response)
      throws IOException {
    response.setContentType("text/html;");
    response.getWriter().println("<h1>Hello world!</h1>");
  }
}

You can view the directory here or download it as a zip file here.

See the Anatomy of a Web App tutorial for instructions on compiling and packaging this example.

Anatomy of a Web App Examples

Hello World: Static Website Hello World: Static Website

Run a server that shows a static website.

Hello World: Command Line Hello World: Command Line

Use the command line to run a server.

Hello World: Maven Hello World: Maven

Use Maven to build a web app.

Add Your Own Example Add Your Own Example

Add your own example to Happy Coding.

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