What is JSP
What is a JSP and what is it used for?
Java Server Pages (JSP) is a platform independent presentation layer technology that comes with SUN's J2EE platform. JSPs are normal HTML pages with Java code pieces embedded in them. JSP pages are saved to *.jsp files. A JSP compiler is used in the background to generate a Servlet from the JSP page.
Or you can answer it from two different perspectives: that of an HTML designer and that of a Java programmer.
If you are an HTML designer, you can look at JSP technology as extending HTML to provide you with the ability to seamlessly embed snippets of Java code within your HTML pages. These bits of Java code generate dynamic content, which is embedded within the other HTML/XML content you author. Even better, JSP technology provides the means by which programmers can create new HTML/XML tags and JavaBeans components, which provide new features for HTML designers without those designers needing to learn how to program.
Note: A common misconception is that Java code embedded in a JSP page is transmitted with the HTML and executed by the user agent (such as a browser). This is not the case. A JSP page is translated into a Java servlet and executed on the server. JSP statements embedded in the JSP page become part of the servlet generated from the JSP page. The resulting servlet is executed on the server. It is never visible to the user agent.
If you are a Java programmer, you can look at JSP technology as a new, higher-level means to writing servlets. Instead of directly writing servlet classes and then emitting HTML from your servlets, you write HTML pages with Java code embedded in them. The JSP environment takes your page and dynamically compiles it. Whenever a user agent requests that page from the Web server, the servlet that was generated from your JSP code is executed, and the results are returned to the user.
2007-04-03, 5003👍, 0💬
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