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JSP Introduction


JSP stands for Java Server Pages and is a dynamic web development technology. It uses JSP tags to insert Java code into HTML pages. Label usually <%Start with%>End.

JSP is AJava servlet that is primarily used to implement the user interface portion of a Java web application. Web developers write JSPs by combining HTML code, XHTML code, XML elements, and embedded JSP operations and commands.

JSP takes user input data, accesses databases and other data sources through web forms, and then dynamically creates web pages.

JSP tags have many functions, such as accessing the database, recording user selection information, accessing JavaBeans components, etc., and passing control information and sharing information on different web pages.


Why use JSP?

JSP programs have similar functions to CGI programs, but compared to CGI programs, JSP programs have the following advantages:

  • Performance is superior because JSP can embed elements directly in HTML pages without having to reference CGI files separately.
  • The server calls the compiled JSP file, unlike CGI/Perl, which must load the interpreter and the target script first.
  • JSP is based on the Java Servlet API, so JSP has a variety of powerful enterprise Java APIs, including JDBC, JNDI, EJB, JAXP and more.
  • JSP pages can be used with servlets that handle business logic, which is supported by the Java servlet template engine.

Finally, JSP is an integral part of Java EE and a complete enterprise application platform. This means that JSP can implement the most complex applications in the simplest way.


The advantages of JSP

The following are some of the other benefits of using JSP:

  • Compared with ASP: JSP has two major advantages. First, the dynamic part is written in Java, not VB or other MS-specific languages, so it's more powerful and easy to use. The second point is that JSP is easy to port to non-MS platforms.
  • Compared with pure Servlet: JSP can easily write or modify HTML pages without facing a lot of println statements.
  • Compared with SSI: SSI cannot use form data and cannot connect to the database.
  • Compared with JavaScript: Although JavaScript can dynamically generate HTML on the client side, it is difficult to interact with the server, so it cannot provide complex services such as accessing databases and image processing.
  • Compared to static HTML: Static HTML does not contain dynamic information.