UTGB track (web application) consists of a set of actions, which are accessible from http://localhost:8989/myapp/(action name). To add your own action, type utgb action (action name). It will add a new action into you web application. To enable the new action in your web server, you need to issue the compile command again, and have to restart the web server.

myapp> utgb action HelloWorld

myapp> utgb compile

myapp> utgb server

You may see the new action from http://localhost:8989/myapp/HelloWorld or http://localhost:8989/myapp/helloworld (lower case name).

A web action receives a set of URL query parameters in the form of String. For example, a request http://localhost:8989/myapp/helloworld?name=leo&year=2008 has two parameters, name and year. In the traditional web application development (e.g. CGI), you have to convert the data type of these values; for example, the name value is String itself, and the year value must be translated from String to Integer. To program these processes is bothersome and usually error-prone. In UTGB, these tasks can be performed in a simple manner. All you need to do is to add appropriate setter methods in your action. UTGB automatically translates String input values in a URL request by investigating the setter's argument type.

public class HelloWorld extends WebTrackBase
{
    private static final long    serialVersionUID    = 1L;
    private static Logger _logger = Logger.getLogger(HelloWorld.class);
   
    private String name = "World";
    private int year = 2007;
    public HelloWorld()
    {}
    
    public void handle(HttpServletRequest request, HttpServletResponse response)
    throws ServletException, IOException
    {
        response.getWriter().println("Happy new year! " + name + ":" + year);
    }

     // setters for year and name parameters 
     public void setYear(int year) { this.year = year; }
     public void setName(String name) { this.name = name; } 
}