To View the hello2 Web Module Using NetBeans IDE (The Java EE 6 Tutorial)

The Java EE 6 Tutorial

To View the `hello2` Web Module Using NetBeans IDE

In NetBeans IDE, select File->Open Project.

In the Open Project dialog, navigate to:
tut-install/examples/web/

Select the hello2 folder.

Select the Open as Main Project check box.

Expand the Source Packages node, then the servlets node.

Double-click the GreetingServlet.java file to view it.

This servlet overrides the doGet method, implementing the GET method of HTTP. The servlet displays a simple HTML greeting form whose Submit button, like that of hello1, specifies a response page for its action. The following excerpt begins with the @WebServlet annotation that specifies the URL pattern, relative to the context root:

@WebServlet("/greeting")
public class GreetingServlet extends HttpServlet {

    @Override
    public void doGet(HttpServletRequest request,
            HttpServletResponse response)
            throws ServletException, IOException {

        response.setContentType("text/html");
        response.setBufferSize(8192);
        PrintWriter out = response.getWriter();

        // then write the data of the response
        out.println("<html>"
                + "<head><title>Servlet Hello</title></head>");

        // then write the data of the response
        out.println("<body  bgcolor=\"#ffffff\">"
                + "<img src=\"duke.waving.gif\" alt=\"Duke waving\">"
                + "<h2>Hello, my name is Duke. What's yours?</h2>"
                + "<form method=\"get\">"
                + "<input type=\"text\" name=\"username\" size=\"25\">"
                + "<p></p>"
                + "<input type=\"submit\" value=\"Submit\">"
                + "<input type=\"reset\" value=\"Reset\">"
                + "</form>");

        String username = request.getParameter("username");
        if (username != null && username.length() > 0) {
            RequestDispatcher dispatcher =
                    getServletContext().getRequestDispatcher("/response");

            if (dispatcher != null) {
                dispatcher.include(request, response);
            }
        }
        out.println("</body></html>");
        out.close();
    }
    ...

Double-click the ResponseServlet.java file to view it.

This servlet also overrides the doGet method, displaying only the response. The following excerpt begins with the @WebServlet annotation, which specifies the URL pattern, relative to the context root:

@WebServlet("/response")
public class ResponseServlet extends HttpServlet {

    @Override
    public void doGet(HttpServletRequest request,
            HttpServletResponse response)
            throws ServletException, IOException {
        PrintWriter out = response.getWriter();

        // then write the data of the response
        String username = request.getParameter("username");
        if (username != null && username.length() > 0) {
            out.println("<h2>Hello, " + username + "!</h2>");
        }
    }
    ...

Under the Web Pages node, expand the WEB-INF node and double-click the sun-web.xml file to view it.

In the General tab, observe that the Context Root field is set to /hello2.

For this simple servlet application, a web.xml file is not required.