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Java Server Pages (JSP)
JSP or JavaServer Pages, known to some as the Java Scripting Preprocessor, is a Java technology that allows developers to dynamically generate HTML, XML or some other type of web page. The technology allows Java code and certain pre-defined actions to be embedded into static content.

The JSP syntax adds additional XML tags, called JSP actions, to be used to invoke built-in functionality. Additionally, the technology allows for the creation of JSP tag libraries that act as extensions to the standard HTML or XML tags. Tag libraries provide a platform independent way of extending the capabilities of a web server.

JSPs are compiled into Servlets by a JSP compiler. A JSP compiler may generate a servlet in Java code that is then compiled by the Java compiler, or it may generate byte code for the servlet directly. In either case, it is helpful to understand how the JSP compiler transforms the page into a Java servlet. For an example, see the following input, and its resulting generated Java servlet.

JSP and Servlets

JSP Syntax A JavaServer Page may be broken down into the following pieces:

• static data such as HTML
• JSP directives such as the include directive
• JSP scripting elements and variables
• JSP actions
• custom tags

Static data

JSP directives

• include – The include directive informs the JSP compiler to include a complete file into the current file. It is as if the contents of the included file were pasted directly into the original file. This functionality is similar to the one provided by the C preprocessor.
  <%@ include file="somefile.ext" %>
• page – There are several options to the page directive.
  • import results in a java import statement being inserted into the resulting file
  • contentType specifies the content that is generated. This should be used if HTML is not used or if the character set is not the default character set.
  • errorPage indicates the page that will be shown if an exception occurs while processing the HTTP request.
  • isErrorPage if set to true, it indicates that this is the error page.
  • isThreadSafe indicates if the resulting servlet is thread safe.
    • <%@ page import="java.util.*" %> //example import
    • <%@ page contentType="text/html" %> //example contentType
    • <%@ page isErrorPage=false %> //example for non error page
    • <%@ page isThreadSafe=true %> //example for a thread safe JSP
    • Note: Only the "import" page directive can be used multiple times in the same JSP.