Servlets

• Java apps that run on a web server
• Servlets are the Java equivalent to CGI programming

Hello, world

// Hello.java
import java.io.*;
import javax.servlet.*;

public class Hello extends GenericServlet {
    public void service(ServletRequest request, ServletResponse response)
        throws ServletException, IOException
    {
        response.setContentType("text/html");
        PrintWriter pw = response.getWriter();
        pw.println("Hello, world!");
        pw.close();
    }
}