Download Apache Jakarta Commons: Reusable Java Components by Will Iverson PDF

By Will Iverson

Iverson, an program improvement perform supervisor, exhibits Java builders how one can take complete good thing about Jakarta Commons. He starts with an summary of the objectives, deploy, and use of the Commons parts, then provides example-rich chapters at the 12 most respected Commons applications, supplying precise code samples for each part. The publication might be helpful for builders development code for front-end net functions, client-side software program, or back-end servers.

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Extra info for Apache Jakarta Commons: Reusable Java Components

Example text

Notice the text field at the top, allowing the user to specify a URL, and the two buttons. 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.

Jsp">Return to default directory

The FTPConnection object used by the JSP page is fairly straightforward, as shown in Figure 4-3. Figure 4-3. FTPConnection class. The code for FTPConnection is shown in Listing 4-2. 54 55 Listing 4-2. *; public class FTPConnection { /** * The FTP client implementation. Note that we don't preserve * the client between executions - doing so would significantly * improve performance, but would require more effort to ensure * synchronization.

Listing 2-7. HttpServletRequest; /** This static class is used to manage the files posted to the * server. */ public class Files { public static Hashtable getFiles() { return uploadedFiles; } private static Hashtable uploadedFiles = new Hashtable(); /** * List of blocked file extensions taken from the MS security * note posted at... wsh", // Also, don't allow people to upload code! separator"); /** * Used to determine if a file should not be uploaded based on * file extension. endsWith(blockedFileExtensions[i])) return true; } return false; } /** 32 * The base path corresponds to the base directory of the 33 * application context's WEB-INF directory.

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