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Java Server Pages
- 1. Java Server Pages By Prepared By Raheela Patel Shri Siddheshwar Women’s Polytechnic,solapur
- 2. Content • Introduction • Expression • Declarations • JSP Life Cycle • Java Beans
- 3. Introduction • Java Server Pages (JSP) is a technology that helps software developers create dynamically generated web pages based on HTML, XML, or other document types. Released in 1999 by Sun Microsystems, JSP is similar to PHP, ASP and React's JSX but it uses the Java programming language. • JSP technology is used to create web application just like Servlet technology. It can be thought of as an extension to servlet because it provides more functionality than servlet such as expression language, jstl etc. • A JSP page consists of HTML tags and JSP tags. The jsp pages are easier to maintain than servlet because we can separate designing and development. It provides some additional features such as Expression Language, Custom Tag etc.
- 4. Life Cycle of JSP
- 5. Expression • The code placed within JSP expression tag is written to the output stream of the response. So you need not write out.print() to write data. It is mainly used to print the values of variable or method. • Syntax of JSP expression tag <%= statement %>
- 6. Declarations • The JSP declaration tag is used to declare fields and methods. • The code written inside the jsp declaration tag is placed outside the service() method of auto generated servlet. • So it doesn't get memory at each request. • The syntax of the declaration tag is as follows: <%! field or method declaration %>
- 7. Example of expression tag <html> <body> <%= "welcome to jsp" %> </body> </html>
- 8. Example of Declaration tag <html> <body> <%! int cube(int n){ return n*n*n*; } %> <%= "Cube of 3 is:"+cube(3) %> </body> </html>
- 9. Advantages Over Serverlet • Extension to Servlet • Easy to maintain • Fast Development: No need to recompile and redeploy • Less code than Servlet
- 10. Sample program <html> <body> <% out.print(2*5); %> </body> </html>
- 11. Java Beans • In computing based on the Java Platform, JavaBeans are classes that encapsulate many objects into a single object (the bean). They are serializable, have a zero-argument constructor, and allow access to properties using getter and setter methods.