Hello Forms

We can handle a form:

<html>
  <head>
    <title>Introductions</title>
  </head>
  <body>
    <form method="get" action="/servlet/hello">
      If you don't mind me asking, what is your name?
      <input type="text" name="name"/><p/>
        <input type="submit"/>
    </form>
  </body>
</html>

with this code:

import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;

public class Hello extends HttpServlet {

  public void doGet(HttpServletRequest req, HttpServletResponse res)
                               throws ServletException, IOException {

    res.setContentType("text/html");
    PrintWriter out = res.getWriter();

    String name = req.getParameter("name");
    out.println("<html>");
    out.println("<head><title>Hello, " + name + "</title></head>");
    out.println("<body>");
    out.println("Hello, " + name);
    out.println("</body></html>");
  }

  public String getServletInfo() {
    return "A servlet that knows the name of the person to whom it's" + 
           "saying hello";
  }
}

The code gets the value of the parameter and prints it.