JSP-based dynamic website development technology _ MySQL

With the development of Web technology and the arrival of the e-commerce era, people are no longer satisfied with the establishment of various websites for static information publishing. more often, they need to be able to interact with users, dynamic websites that provide services such as management and control of backend databases. Dynamic website development technology early dynamic website development technology is the use of CGI-BIN interface. With the development of Web technology and the arrival of the e-commerce era, developers are no longer satisfied with the establishment of various websites for static information Publishing, more often, it is necessary to interact with users and provide dynamic websites with services such as management and control of backend databases.
Dynamic website development technology
Early dynamic website development technology used CGI-BIN interfaces. Developers write separate programs related to interfaces and Web-based applications. The latter calls the former through the Web server. This development technology has serious scalability problems-each new CGI program requires a new process to be added to the server. If multiple users access the program concurrently, these processes will exhaust all the available resources of the Web server until it crashes.
To overcome this drawback, Microsoft proposed the Active Server Pages (ASP) technology, which simplifies Web application development by using plug-ins and APIs. Compared with CGI, ASP has the advantage that it can contain HTML tags, directly access the database, and use infinitely expanded ActiveX controls. Therefore, it is more flexible in programming. However, this technology is basically limited to Microsoft's operating system platform. The main work environment is Microsoft's IIS application structure, therefore, ASP technology cannot easily implement cross-platform Web server program development.
Hypertext Preprocessor (Hyper Text Preprocessor) is similar to ASP in PHP dynamic website development technology. it is also a server-side scripting language embedded in HTML documents. Most of its syntax is similar to C, Java, Perl, and other languages, and forms its own unique style. with this language, Web programmers can quickly develop dynamic Web pages. PHP can run on most Unix platforms, GUN/Linux, and Microsoft Windows platforms. PHP has the following advantages: easy installation, simple learning process, convenient database connection, strong compatibility, strong scalability, and object-oriented programming. However, PHP also has some weaknesses, mainly because PHP is an interpreted language that does not support multi-threaded structures and has limited support for platforms and connected databases, especially in terms of supported standards, PHP is not suitable for some e-commerce applications.

Some other technologies, such as Java Servlets, can be used to easily compile interactive server-side code in Java. A Java Servlets is a Java-based program running on the server (unlike the Applet, which runs on the browser ). Developers write such Java Servlets to receive HTTP requests from Web browsers and dynamically generate responses (you may need to query the database to complete such requests ), then, send a response containing HTML or XML documents to the browser. This technology is very difficult for common page designers to easily master. In this way, the entire webpage must be created in Java Servlets. If developers or Web administrators want to adjust the page display, they have to edit and re-compile the Java Servlets.
Sun Microsystems Inc .) integration and balancing of existing Java programming environments (such as Java Servlets and JavaBeans) with extensive support and cooperation among Web servers, application servers, transaction systems, and development tool vendors) after supporting technologies and tools, a new method for developing Web applications-the assumerver Pages technology (JSP) is developed ). This dynamic website development technology has the following features:
Able to run on any Web or application server;
Separated application logic and page display;
Fast development and testing;
It simplifies the process of developing Web-based interactive applications.
Technical methods of JSP
In order to quickly and conveniently develop dynamic websites, JSP has made improvements in the following aspects, making it the preferred solution to quickly establish a cross-platform dynamic website.
1. separate content generation and display
With JSP technology, Web page developers can use HTML or XML tags to design and format the final page, use JSP identifiers or small scripts to generate dynamic content on the page (the content varies according to the request, such as requesting account information or the price of a specific bottle of wine ). The logic of the generated content is encapsulated in the identifiers and JavaBeans components and bundled in the script. all the scripts run on the server. Because the core logic is encapsulated in the identifiers and JavaBeans, Web administrators and page designers can edit and use JSP pages without affecting content generation.
On the server side, the JSP Engine interprets JSP identifiers and scripts to generate the requested content (for example, accessing the JavaBeans component and accessing the database or containing files using JDBC technology ), in addition, the results are sent back to the browser in the form of HTML (or XML) pages. This not only helps the author to protect his own code, but also ensures the full availability of any HTML-based Web browser.
2. reusable components
Most JSP pages rely on reusable, cross-platform components (JavaBeans or Enterprise JavaBeans components) to execute the complex processing required by applications. Developers can share and exchange components that perform common operations, or make these components used by more users and customer groups. The component-based approach accelerates the overall development process and balances various organizations in their development efforts with their existing skills and optimization results.