XML与JSP联手（外文文献翻译）.docVIP

Using XML and JSP together Im going to assume that, like most Java programmers, you know what JavaServer Pages (JSP) and Extensible Markup Language (XML) are, but you may be a little unclear on how you can use them. JSP use is pretty easy to defend. It allows you to design a Website built from files that look and act a lot like HTML. The only difference is that JSPs also act dynamically -- for example, they can process forms or read databases -- using Java as a server-side scripting language. XML use is more difficult to justify. While it seems as if every new product supports it, each one seems to be using XML for a different purpose. In this article, you will learn to design a system using XML in a fairly modest way. Many Websites have vast collections of data that are displayed in a more or less standard way. I will design a system that uses XML files to store data on a Web server and JSP files to display that data. XML versus relational databases But wait, you may ask, youre using XML to store data? Why not use a database? Good question. The answer is that for many purposes, a database is overkill. To use a database, you have to install and support a separate server process, which often also requires installing and supporting a database administrator. You must learn SQL, and write SQL queries that convert data from a relational to an object structure and back again. If you store your data as XML files, you lose the overhead of an extra server. You also gain an easy way to edit your data: just use a text editor, rather than a complicated database tool. XML files are also easier to back up, to share with your friends, or to download to your clients. You can also easily upload new data to your site, using FTP. A more abstract advantage of XML is that, being a hierarchical rather than a relational format, it can be used in a much more straightforward manner to design data structures that fit your needs. You dont need to use an entity relationship editor nor norm