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Вы можете ознакомиться и скачать презентацию на тему Web programming. JSP. Доклад-сообщение содержит 41 слайдов. Презентации для любого класса можно скачать бесплатно. Если материал и наш сайт презентаций Mypresentation Вам понравились – поделитесь им с друзьями с помощью социальных кнопок и добавьте в закладки в своем браузере.

Слайды и текст этой презентации

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Web programming. JSP

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Client-server Client Server Protocol

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Client-server Protocol is HTTP Client sends HTTP request Server generates HTTP response Data are returned as document(HTML, XML, image)

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http Hypertext transfer protocol Resources are identified by URI or URL Command consists of header and data Stateless protocol Request defines action to perform Status codes are returned(200, 404, 500, etc)

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http request

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http request

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http request

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http response

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http response <!DOCTYPE html> <html> <body> <h1>My First Heading</h1> <p>My first paragraph.</p> </body> </html>

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Web server Apache Tomcat Jetty GlassFish WebLogic WebSphere WildFly

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Web server

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HTML <html> <body> <form> <input type="hidden" id="code" /> <textarea id="pre_code" /> <form> </body> </html>

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Web server Java servlets Java server pages(JSP) Web sockets

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Java servlet Java component that runs inside web server Web server loads and destroys servlets Receives HTTP requests, generates results and sends out HTTP responses Part of J2EE

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Java servlet

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Servlet container Interacts with Java servlets Manages lifecycle of the servlet Maps URL to particular servlets Ensures security and check access rights Provides deployment, transaction management, concurrency and other services

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Apache tomcat Developed by Apache Software Foundation Includes web server(Coyote), servlet container(Catalina) and JSP engine(Jasper) Requires Java 7 Current version is 8.0.20 Supports Servlets, JSP, EL and Web sockets

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JSP Adds dynamic content to web pages Designed in 1999 Introduced JSTL(JSP standard tag library) Introduced EL(expression language) Current version 2.4

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jsp

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jsp Client sends HTTP request to the server Server recognized HTTP request and forwards to to JSP engine JSP engine loads JSP page and converts it into servlet JSP engine compiles servlet into executable code and forwards request to servlet engine Servlet engine executes servlet and produces HTML HTTP response with HTML is returned to client

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Sample jsp <%@page language="java" contentType="text/html"%> <html> <head><title>Dynamic HTML</title></head> <body> Hello World! </body> </html>

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Sample jsp <% out.println("<br/>Your IP address is " + request.getRemoteAddr()); String userAgent = request.getHeader("user-agent"); out.println(“<br/>” + userAgent); %>

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Java beans Plain Java objects No-argument public constructors Setter and getter for each field May receive or generate events Serializable

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Java beans public class Product implements Serializable { private int id; public Product() {} public int getId() { return id; } public void setId(int id) { this.id = id; } }

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Jsp architecture

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MVC

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mvc Model contains application data and business rules View contains representation of the data Controller sends commands to view and updates model

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Jsp architecture

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Jsp variables application config out pageContext request response session

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httpservletrequest String getParameter(String name) Enumeration<String> getParameterNames() String[] getParameterValues(String name) String getServerName() String getRemoteAddr() String getHeader(String name); String getMethod(); String getContextPath(); String getQueryString();

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httpservletresponse encodeURL(String) sendRedirect(String) getHeader(String) getContentType() getOutputStream() getCharacterEncoding()

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http session Provides way to identify a user who requests web server Identifies user Has time limitations Has a cookie assigned(JSESSIONID) Used to store attributes

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httpsession getAttribute(String) getId() getServletContext() invalidate() removeAttribute(String) setAttribute(String, Object)

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directives Provides web server with information it needs to handle JSP request Executes before compilation page include taglib

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Page directive <%@page language="java" contentType="text/html"%> <%@page import="java.util.ArrayList"%> <%@page import="java.util.*“ %> <%@page import=“org.hillel.it.model.Product, org.hillel.it.model.Order“ %>

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Include directive <%@include file=“header.jsp“ %>

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actions Executing while processing HTTP request forward include param useBean getProperty text setProperty

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Forward action <jsp:forward page=“login.jsp"> <jsp:param name=“reason" value=“nosession"/> </jsp:forward>

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Include action <jsp:include page=“header.jsp"/>

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useBean action <jsp:useBean id=“service" scope="application“ class=“org.hillel.it.service.ServiceImpl“ /> <% int id = Integer.valueOf(request.getParameter(“id”)); Product product = service.getProduct(id) %>