Apache Jakarta Commons: Reusable Java Components by Will Iverson

By Will Iverson

Iverson, an program improvement perform supervisor, indicates Java builders easy methods to take complete good thing about Jakarta Commons. He starts off with an summary of the pursuits, install, and use of the Commons elements, then offers example-rich chapters at the 12 most dear Commons programs, delivering unique code samples for each part. The booklet should be important for builders construction code for front-end internet purposes, client-side software program, or back-end servers.

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Figure 2-11. Files class diagram. The source for the application's in-memory record, shown in Listing 2-7, deals with a number of platform-specific functions in addition to tracking the files themselves. For example, depending on your operating system, you may want to deny certain file names. A list of inappropriate file extensions for Microsoft Windows is shownyou may want to add more if you are using another operating system. zip archives, both to avoid potential security issues associated with other file types and to save space on the server).

Figure 3-7. Initial Swing client view. Clicking the Load button sends a GET request to the specified URL. Figure 3-8 shows the client after clicking the Load button three timesyou'll notice that the counter cookie, displayed at the top of the page (along with the session cookie), is now set to three. The main text area shows the content of the retrieved page, and the bottom bar displays the response code as sent by the server. 43 44 Figure 3-8. Viewing cookies. Clicking the Clear button sends a form POST back to the server, as shown in Figure 3-9.

Figure 3-4. HTTP methods relationship diagram. [View full size image] 39 40 The main methods of interest for HttpMethod and HttpUrlMethod are shown in Figure 3-5. Figure 3-5. HttpMethod interface. 40 41 You may want to inquire about the current status of the client, for example to determine the current state of the cookies that have been set. getState() method. This returns an HttpState object, as shown in Figure 3-6. 41 42 Figure 3-6. HttpState. [View full size image] So, to recap, you'll use an HttpClient object as a single representation of a client, you'll create an HttpMethod to make a connection, and you'll inspect the HttpState object to get data about the current client state.

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