New PDF release: Apache Jakarta Commons: Reusable Java Components

By Will Iverson

Iverson, an software improvement perform supervisor, indicates Java builders the best way to take complete benefit of Jakarta Commons. He starts off with an outline of the pursuits, deploy, and use of the Commons parts, then offers example-rich chapters at the 12 most precious Commons applications, offering distinct code samples for each part. The booklet may be helpful for builders construction code for front-end internet functions, client-side software program, or back-end servers.

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Sample text

The other thing you'll notice is the form, which enables a client that does support cookies to reset the counter. Let's look at the JSP code for this simple web page in Listing 3-2. Listing 3-2. jsp">Reload Page

You'll notice the use of cookie management facilities built into the standard JSP/servlet functionality. It's a shame that similar functionality isn't built into the standard Java SDK for accessing resources via HTTPinstead, we must turn to the Jakarta Commons HttpClient component for assistance.

GetServerPort() + "/" + "ch02/upload/"; } /** Deletes the uploaded file. get(file); if (myFile == null) return; // Marks temporary file for deletion. delete(); // Removes from the in-memory hash. remove(file); } } Limitations and Security Issues Before continuing, it's worth taking a moment to consider some of the limitations of the sample code as shown. Most of these limitations are easily solvable, but it's worth considering both the inherent limitations and the security implications of uploading file data to the server.

When adding file upload capability, make sure you've fully considered the security implications. Summary In this chapter, an application was shown demonstrating the use of the FileUpload component to add file uploads to a web application. In the next chapter, this will be flipped around to look at a library intended to help a client application download data from a web server. Project Ideas Use FileUpload in conjunction with the FTP component of the Net package (described in Chapter 4, "Net") to allow users to post files to an FTP server via a browser.

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