JSP in Java
Jakarta Server Pages (JSP) is a technology that helps software developers create dynamically generated web pages based on HTML, XML, SOAP, or other document types. It was released in 1999 by Sun Microsystems and is similar to PHP and ASP, but uses the Java programming language. JSP allows Java code and certain predefined actions to be interleaved with static web markup content, such as HTML, and the resulting page is compiled and executed on the server to deliver a document. To deploy and run JSP, a compatible web server with a servlet container, such as Apache Tomcat or Jetty, is required.
JSP is an advanced version of Servlet Technology and is used to create dynamic web content. It consists of both HTML tags and JSP tags, with JSP tags used to insert Java code into HTML pages. JSP is first converted into a servlet by the JSP container before processing the client’s request. It has various features like JSP Expressions, JSP tags, JSP Expression Language, etc. JSP is advantageous over Servlet as it requires less coding, is easy to maintain, and has access to the entire API of Java.
Architecturally, JSP may be viewed as a high-level abstraction of Java servlets. JSPs are translated into servlets at runtime, and each JSP servlet is cached and re-used until the original JSP is modified. At runtime, the JSP code is interpreted by the JSP compiler, which parses out all the special features in the JSP code and translates them to Java code. The Java class created from each JSP implements Servlet.
While JSP may not be as commonly used in greenfield projects anymore, it is still a core Java web technology and is used in older Java web applications. Some developers still find it useful for building simple, dynamic Java web pages.
