JavaServer Pages (JSP)
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1 JavaServer Pages (JSP)
2 The Context The Presentation Layer of a Web App the graphical (web) user interface frequent design changes usually, dynamically generated HTML pages Should we use servlets? No difficult to develop and maintain (the view) lack of flexibility lack of role separation: design designer
3 Example: HelloServlet.java import javax.servlet.*; import javax.servlet.http.*; import java.io.*; public class Hello extends HttpServlet { public void doget(httpservletrequest request, HttpServletResponse response) throws IOException { response.setcontenttype("text/html"); } } PrintWriter out = new PrintWriter(response.getWriter()); out.println("<html>" + "<head><title>welcome!</title></head>" + "<body>" + "<h1><font color=\"red\"> Welcome! </font></h1>" + "<h2>current date and time:" + new java.util.date() + " </h2>" + "</body>" + "</html>"); out.close();
4 Example: hello.jsp <html> <head> <title>welcome!</title> </head> <body> <h1><font color="red"> Welcome! </font></h1> <h2>current date and time: <%= new java.util.date() %> </h2> </body> </html>
5 The Concept Standard component to create the presentation, that is conform to View Helper design pattern
6 JavaServer Pages (JSP) The standard solution to create web content easily that has both static and dynamic components Web pages Provides a natural, declarative, presentation oriented approach to creating static content Templates Are based on and benefit from all the dynamic capabilities of Java Servlet technology Every JSP is actually a servlet A first (small) step towards the role separation
7 The main features of JSP A JSP page is a text document that contains: static data (template) (HTML, SVG, WML, etc.) JSP elements, which construct the content JSP elements may be: JSP tags scriptles (code sequences written in Java...) JSP uses an expression language for accessing server-side objects The source files may be.jsp,.jspf,.jspx
8 The Life Cycle of a JSP Page
9 Translation Phase //Example taken from Apache Tomcat application server //This is the source file of the servlet generated for hello.jsp package org.apache.jsp; import javax.servlet.*; import javax.servlet.http.*; import javax.servlet.jsp.*; implements javax.servlet.servlet public final class hello_jsp extends org.apache.jasper.runtime.httpjspbase implements org.apache.jasper.runtime.jspsourcedependent {... public void _jspservice(httpservletrequest request, HttpServletResponse response) throws java.io.ioexception, ServletException {... out.write("<html>");... out.write("</html>"); } }
10 JSP Syntax <%-- Hello World example, not again... --%> JSP Comment page language="java" contenttype="text/html; pageencoding="utf-8"%> <html> <head> <title>first JSP</title> </head> page import="java.util.date" %> include file="header.html" %> JSP Directives <%! String message = "Hello World"; %> <body> <% for(int i=1; i<=4; i++) { out.println("<h" + i + ">" + message + "</H" + i + ">"); } %> <!-- Page generated at: <%= new Date() %> --> </body> </html> JSP Expression JSP Declaration JSP Scriptlet
11 JSP Elements Element Standard Syntax XML Syntax Comment <% %> <! > Declarations <%!..%> <jsp:declaration>.. </jsp:declaration> Directives include.. %> page.. %> taglib.. %> <jsp:directive.include.. /> <jsp:directive.page.. /> xmlns:prefix="tag library URL" Expressions <%=..%> <jsp:expression>.. </jsp:expression> Scriptles <%..%> <jsp:scriptlet>.. </jsp:scriptlet> Standard actions <jsp:action>.. </jsp:action> <jsp:usebean>.. </jsp:usebean> <jsp:forward>.. </jsp:forward> <jsp:include>.. </jsp:include>.. Everything else besides the JSP elements is considered static content and it appears unaltered in the output. <html> <!-- this is static content --> Hello world! </html>
12 Scopes
13 JSP Objects Object Type Scope request HttpServletRequest REQUEST response HttpServletResponse PAGE application ServletContext APPLICATION pagecontext PageContext PAGE out JSPWriter PAGE config ServletConfig PAGE page (this) HttpJspPage PAGE session HttpSession SESSION exception Throwable PAGE
14 Examples of using JSP objects Get a parameter from the request <%= request.getparameter("nume") %> Get the IP address of the client and the type of his browser <%= request.getremoteaddr() %> <%= request.getheader("user-agent") %> <% session.setattribute("user", "Duke"); synchronized (application) { application.setattribute("sharedobject", new Object()); } out.println("<h1> Hello </h1>"); response.sendredirect(" response.senderror(404); %>
15 Exception Handling page errorpage="showerror.jsp" %> <html> <head> <title>error Handling Example</title> </head> <body> <% // Throw an exception to invoke the error page int x = 1; if (x == 1) { throw new RuntimeException("Boom!"); } %> </body> </html> Some JSP Page <%@ page iserrorpage="true" %> <html> <head> <title>show Error Page</title> </head> <body> <h1>opps...</h1> <p>sorry, an error occurred.</p> Error Handler <p>here is the exception stack trace: </p> <pre> <% exception.printstacktrace(response.getwriter()); %> </pre> </body> </html>
16 JSP Actions An action encapsulates some logic, that will be accesible using an XML tag The goal is: to eliminate scriptlets from a page to promote reusability There are two types of JSP actions: standard, of the form <jsp:action /> custom
17 JSP Standard Actions Accessing the Data Layer (The Model) <jsp:usebean> <jsp:setproperty> <jsp:getproperty> Dispatching the request... <jsp:forward> <jsp:include>
18 JavaBean Components Reusable components that encapsulate some data exposed as properties Described by classes that are public, serializable and have a default constructor JavaBeans are used to store information at a specific scope: request, session, etc. JSP Pages and Servlets will store and retrieve data using JavaBeans The Model
19 Example of a JavaBean package test; public class Person { Person is a bean private String name; private BigDecimal salary;... public String getname() { return name; } Name is a property public void setname(string name) { this.nume = nume; } }...
20 Standard Actions for JavaBeans Creating/Accessing an instance of the bean <jsp:usebean id="pers" class="test.person" scope="session" > pers.setname("duke");... </jsp:usebean> Accessing the properties of the bean <jsp:setproperty name="pers" property="name" value="joe" /> Person, your name is: <jsp:getproperty name="pers" property="name"/> A (small) step towards accesing the data layer without writing Java code...
21 Model 1
22 Using a JavaBean in a JSP <html> <jsp:usebean id="pers" scope="request" class="test.person" /> <%-- We use introspection to populate the bean --%> <jsp:setproperty name="pers" property="*" /> <% if ( request.getparameter("name") == null ) { %> <form method="get"> Nume: <input type="text" name="name" size="25" /> <br/> <input type="submit" value="ok"/> </form> <% } else { <!-- If we decide not to use introspection: <jsp:setproperty name="pers" property="name" value="<%= request.getparameter("name") %>" /> --> Salut, <jsp:getproperty name="pers" property="name" />! <% } %> </html>
23 Using a JavaBean in a servlet public void doget (HttpServletRequest request, HttpServletResponse response) { //Get the JavaBean from its scope Person person = (Person) request.getattribute("pers"); // Use the JavaBean person.setname("joe"); //Eventually, forward the request getservletcontext().getrequestdispatcher("result.jsp").forward(request, response); }
24 <jsp:forward page=... />
25 <jsp:include page=... /> include %> directive <jsp: include /> action
26 Request Chaining The first JSP of the chain maps the input elements of the form to the properties of the bean. <jsp:setproperty name="pers" property="name" value="*" />
27 Model View Controller
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