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The first if statement in serveFile() removes the initial slash before attempting to open the file specified by the pathname. Also, the second if statement in serveFile() will choose index.html, and serve the default home page if the client did not explicitly specify a file in the HTTP GET request. The serveFile() method then attempts to open the chosen file and read it into the web server s memory. The code in the try block attempts to initialize a FileReader object with the name of the chosen file, and then attempts to read a single character from the file. If FileReader is not able to open the file and read a byte from it (perhaps because the file does not exist), an exception will be thrown (or raised) and the catch block will return an error to the client. If the file was successfully opened, the server tells the client that the server will be able to satisfy its request for the file by sending an HTTP/1.0 200 OK response message. Then, the server enters a while loop that reads a byte from the file and appends it into a StringBuffer until there are no more bytes in the file. (The FileReader s read method returns -1 when it is finished reading the file.) Once serveFile() finishes reading the file, it outputs the content of the entire StringBuffer to the client, control returns to processRequest(), the connection to the client is closed, and the server waits to process the next client connection. And that s how SimpleWebServer works. It s a very lightweight web server. Of course, it doesn t implement the full HTTP specification (or even a reasonable subset of it), but it can successfully respond to requests from web browser clients.

This first exercise taught you how to build your own toolbars. It also showed you how to use the GtkHandleBox container. In the next exercise, you will reimplement the Text Editor application with a menu bar.

route will suffice for a while, but later on you ll want to add more routes in order to provide URLs that are specific to your application. Just like how previous versions of ASP.NET decided the URL for you based on the directory structure and the Web Form filename (such as Default.aspx), ASP.NET MVC projects come with a default URL structure. Applications that don t require custom URL schemes will do just fine with the defaults. Each route has a name B, a URL definition C, and optional default values D. Our first request for / doesn t have any of these URL pieces, so we look to the defaults. The default values are:

In this exercise, implement the same application as in Exercise 9-1, except use a menu bar this time. You should continue to use GtkUIManager, but the menu does not need to be contained by a GtkHandleBox. Since tooltips are not shown for menu items automatically, use a status bar to provide more information about each item. The menu bar should contain two menus: File and Edit. You should also provide a Quit menu item in the File menu.

The route with the template {controller}/{action}/{id} is a generic one and can be used for many different web requests. Tokens are denoted by the inclusion of curly braces, {}, and the word enclosed in braces matches a value the MVC Framework understands. The most common values that we ll be interested in are controller and action. The controller route value is a special value that the System.Web.Mvc.MvcHandler class passes to the controller factory in order to instantiate a controller. This is also the route we ll be using for the rest of the chapter, so we ll be content with a URL in the form of http://site.org/controllername/actionname. The basic route handler is an instance of IRouteHandler named MvcRouteHandler. We have complete control and could provide our own implementation of IRouteHandler if we wished, but we ll save that for a later chapter.

SimpleWebServer can be compiled as follows: C:\SimpleWebServer> javac SimpleWebServer.java SimpleWebServer is built such that the root of the document tree is the directory from which the program is executed. The web server can be run by invoking the Java interpreter as follows: C:\SimpleWebServer> java com.learnsecurity.SimpleWebServer So how can the web server be used Once the web server gets a connection from a client, it will start looking for files requested by the client in the C:\SimpleWebServer directory. Assume there exists a file called index.html in that directory, which is the default home page for the web server. Typical GET requests from clients may contain a forward slash at the start of the pathname for the file requested, as follows: GET /index.html HTTP/1.0

Summary

We know now that the controller is Home and the action is Index. Take a look in the Controllers folder and you ll see a class called HomeController. By convention, all controller classes end with the word Controller. Open this class and you ll see your first controller class (listing 1.2).

In this chapter, you learned two methods for creating menus, toolbars, and menu bars. The first method was the manual method, which was more difficult but introduced you to all of the necessary widgets. The first example showed you how to use basic menu items to implement a pop-up menu for a progress bar. This example was expanded on in order to provide keyboard accelerators and more information to the user with the GtkStatusbar widget. You also learned about submenus as well as image, toggle, and radio menu items.