jsppresentation-1jsppresentation-160407040755.pptx60407040755.pptx
gvenkatacharvicse230
29 views
34 slides
Aug 29, 2025
Slide 1 of 34
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
About This Presentation
jsppresentation-160407040755.pptxjsppresentation-160407040755.pptxjsppresentation-160407040755.pptxjsppresentation-160407040755.pptxjsppresentation-160407040755.pptxjsppresentation-160407040755.pptxjsppresentation-160407040755.pptxjsppresentation-160407040755.pptx
Slide Content
Java Server Pages By K.Siva Naga Lakshmi DS-A
Topics Introduction to JSP Introduction to Servlet JSP vs Servlet Architecture of JSP Life Cycle of a JSP Page JSP Scripting Elements JSP Directives JSP Implicit Objects Transferring Control of JSP MVC in JSP 2
Topics Cont. Demo Create a JSP Page Create a Servlet Configure Servlet Using web.xml Parse Data Between JSP & Servlet Set Default Error Page 3
What is JSP? JSP is a server-side programming technology. Developed by Sun Microsystems in 1999. Fast way to create web pages to display dynamic data . JSP page contains both static & dynamic data . 4
What is JSP? Cont. Helps to write web applications easily even with a less knowledge in Java . Extension of a JSP page is . jsp or . jspx Initially JSP was developed to replace servlet but now common practice is to use servlet and JSP together using MVC (model-view-controller) pattern. 5
What is Servlet? Servlet is a server-side program. Executes in a web server (eg: Tomcat). Receives HTTP requests from users and returns HTTP responses . Written in Java. Runs on every platform that supports Java. Supported my most popular web servers. 6
7 JSP vs Servlet Relationship between JSP & Servlet JSP is an interface on top of Servlets. A JSP program is compiled into a Java servlet before execution. Why JSP? Easier to write than servlets Designers can write HTML, programmers can write Java portions Servlets came first, followed by JSP.
8 JSP vs Servlet Cont. Advantages of Servlets Performance Get loaded upon first request Multithreading Each request runs in its own separate thread Simplicity Run inside controlled server environment No specific client software is needed: Web browser is enough
9 Architecture of JSP Fig: JSP Processing
10 Architecture of JSP Cont. Client’s Computer Server 1.Browser requests HTML 7. Server sends HTML back to browser servlet servlet class 5.The servlet runs and generates HTML Java Engine 6. Java Engine sends HTML to server 2. Server sends requests to Java Engine 3. If needed, the Java Engine reads the . jsp file 4. The JSP is turned into a servlet, compiled, and loaded Bean JSP
11 Lifecycle of a JSP Page A JSP life cycle can be defined as the entire process from its creation till the destruction The following are the paths followed by a JSP Compilation has 3 steps Parsing JSP Turning the JSP into a servlet Compiling the servlet Initialization Execution Destroy
12 Request Response Lifecycle of a JSP Page Cont.
13 JSP Scripting Elements There are three types of scripting elements in JSP, Scriptlet tag Expression tag Declaration tag
14 Scriptlet Tag In JSP, JAVA code can be written inside the JSP page using Scriptlet tag . Syntax: <% java source code %> Example: <html> <body> <% out.print (“Hello world…”); %> </body> </html>
15 Expression Tag Code placed within expression tag is written to the output stream of the response. So, no need to write out.print () to write data. Syntax: <%= Statement %> Example: <html> <body> <%= “Hello world!” %> </body> </html> Note: Do not end statement with semicolon (;)
16 Declaration Tag Used to declare fields and methods . The code written inside this tag is placed outside the service() method of auto generated servlet. So it doesn’t get memory at each request. Syntax: <%! Statement %> Example: <html> <body> <%! int data=60; %> <%= “Value is: “ + data %> </body> </html>
17 Comments in JSP There are two types of JSP comment types that we are using. Hidden Comments (JSP comments) Visible only inside JSP page but not in the generated HTML page Example: <%-- This is a hidden JSP comment --%> Comments within HTML content Comments to be generated inside the output HTML page Example: <!-- Comment inside the generated HTML -->
18 JSP Directives Directives are messages that tells the web container how to translate a JSP page into corresponding servlet . Three types: page directive include directive taglib directive Syntax of JSP directives <%@ directive attribute=“value” %>
19 page directive Defines attributes that apply to an entire JSP page. Syntax: <%@ page attribute=“value” %> Attributes : import, contentType , extends, info, buffer, language, autoFlush , session, pageEncoding , errorPage , isErrorPage
20 include directive Includes the contents of any resource (may be jsp file, html file or text file. It includes the original content of the included resources at page translation time. Reusability is the advantage. Syntax: <%@ include file=“ resourcename ” %>
21 taglib directive Used to define a tag library that defines many tags. We use the TLD (Tag Library Descriptor) file to define the tags. Syntax: <%@ taglib uri =“ uriofthetaglibrary ” prefix=“ prefixoftaglibrary ” %>
22 JSP Implicit Objects There are several objects that are automatically available in JSP called implicit objects. Variable Type out JspWriter request HTTPServletRequest response HTTPServletResponse config ServletConfig application ServletContext session HTTPSession pageContext PageContext page Object exception Throwable
23 out implicit object For writing any data to the buffer , JSP provides an implicit object named out. Syntax: out.print (); request implicit object Access to information associated with a request . This object is normally used in looking up parameter values and cookies. <% String str = request.getParameter (“ uname ”); %>
24 config implicit object This object can be used to get configuration information for a particular JSP page. This variable information can be used for one JSP page only. application implicit object This object can be used to get configuration information from configuration file(web.xml). This variable information can be used for all JSP pages.
25 session implicit object The Java developer can use this object to set, get or remove attribute or to get session information . pageContext implicit object The pageContext object can be used to set,get or remove attribute from one of the following scopes: i . Page ii. Request iii. Session iv. Application exception implicit object This object can be used to print the exception . But it can only be used in error pages.
26 Transferring Control of JSP Transferring control explain how to redirect user to another page from JSP. There are two methods. sendRedirect () forward()
27 sendRedirect () Request is transfer to another resource to different domain or different server for further processing. Container transfers the request to client or browser so URL given inside the sendRedirect method is visible as a new request to the client . When sendRedirect method calls, old request and response objects are lost because it is treated as new request by the browser.
28 sendRedirect () Cont. We can notice the browser address bar URL will change . This method is slower because it involves two tasks (requests). Create a new request Remove old request If we need to pass data using this method, we may need to use session or pass data along with the URL.
29 forward() Request is transfer to other resource within the same server for further processing. Web container handle all process internally and client or browser is not involved. When forward method is called on requestdispatcher object we pass request and response objects so our old request object is present on new resource which is going to process our request.
30 forward() Cont. We cannot notice any change of the URL in browser address bar. Faster than send redirect. When we redirect using forward and we want to use same data in new resource we can use request.setAttribute () as we have request object available.
31 MVC in JSP MVC – Model View Controller It is a design pattern that separates the business logic, presentation logic and data. Model The back-end of the application. Can be legacy code or Java code (usually JavaBeans).
32 View The end user’s view (what does the end user see?). Mostly done using JSP . Controller Controls the overall flow of the application. Usually a servlet . MVC Cont.
33 (Client) Browser (Controller) Servlet (View) JSP (Model) Java Beans Enterprise Servers/ Data sources Request Response Application server 1 5 3 2 instantiate 4 MVC Architecture
35 Thank You!
Tags
Categories
GeneralDownload
Download Slideshow Get the original presentation fileQuick Actions
Statistics
- Views 29
- Slides 34
- Age 93 days
Related Slideshows
22
Pray For The Peace Of Jerusalem and You Will Prosper
RodolfoMoralesMarcuc
30 views
26
Don_t_Waste_Your_Life_God.....powerpoint
chalobrido8
32 views
31
VILLASUR_FACTORS_TO_CONSIDER_IN_PLATING_SALAD_10-13.pdf
JaiJai148317
30 views
14
Fertility awareness methods for women in the society
Isaiah47
29 views
35
Chapter 5 Arithmetic Functions Computer Organisation and Architecture
RitikSharma297999
26 views
5
syakira bhasa inggris (1) (1).pptx.......
ourcommunity56
28 views