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JSPs JSPs Lecture 8 Lecture 8 cs193i – Internet cs193i – Internet Technologies Technologies Summer 2004 Summer 2004 Stanford University Stanford University

JSPs Lecture 8 cs193i – Internet Technologies Summer 2004 Stanford University

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Page 1: JSPs Lecture 8 cs193i – Internet Technologies Summer 2004 Stanford University

JSPsJSPsLecture 8Lecture 8

cs193i – Internet cs193i – Internet TechnologiesTechnologies

Summer 2004Summer 2004

Stanford UniversityStanford University

Page 2: JSPs Lecture 8 cs193i – Internet Technologies Summer 2004 Stanford University

Administrative StuffAdministrative Stuff

HW#3 due todayHW#3 due today HW#4 due August 11HW#4 due August 11 All local SCPD students must come All local SCPD students must come

to campus for final examto campus for final exam

Page 3: JSPs Lecture 8 cs193i – Internet Technologies Summer 2004 Stanford University

Why JSPs?Why JSPs?

Goal: Create dynamic web content (HTML, XML, ...) for a Web Application

Goal: Make it easier/cleaner to mix static HTML parts with dynamic Java servlet code

JSP specification ver. 2.0Java Servlet specification ver. 2.4

Page 4: JSPs Lecture 8 cs193i – Internet Technologies Summer 2004 Stanford University

JSP/ASP/PHP vs JSP/ASP/PHP vs CGI/ServletsCGI/Servlets

CGI & Servlets -- Mostly Code with some HTML via print & out.println

JSP/ASP/PHP -- Mostly HTML, with code snippets thrown in No explicit recompile Great for small problems Easier to program Not for large computations

Page 5: JSPs Lecture 8 cs193i – Internet Technologies Summer 2004 Stanford University

What is JSP?What is JSP?

Mostly HTML page, with extension .jsp Include JSP tags to enable dynamic

content creation Translation: JSP → Servlet class Compiled at Request time

(first request, a little slow) Execution: Request → JSP Servlet's

service method

Page 6: JSPs Lecture 8 cs193i – Internet Technologies Summer 2004 Stanford University

What is a JSP?What is a JSP?

<html> <body> <jsp:useBean.../> <jsp:getProperty.../> <jsp:getProperty.../> </body></html>

Page 7: JSPs Lecture 8 cs193i – Internet Technologies Summer 2004 Stanford University

AdvantagesAdvantages

Code -- Computation HTML -- Presentation Separation of Roles

Developers Content Authors/Graphic

Designers/Web Masters Supposed to be cheaper... but not

really...

Page 8: JSPs Lecture 8 cs193i – Internet Technologies Summer 2004 Stanford University

Model-View-ControllerModel-View-Controller

A Design Pattern Controller -- receives user interface

input, updates data model Model -- represents state of the world

(e.g. shopping cart) View -- looks at model and generates

an appropriate user interface to present the data and allow for further input

Page 9: JSPs Lecture 8 cs193i – Internet Technologies Summer 2004 Stanford University

Model-View-ControllerModel-View-Controller

Bean

JSP

ServletController

View

Model

Page 10: JSPs Lecture 8 cs193i – Internet Technologies Summer 2004 Stanford University

public class OrderServlet … { public void dogGet(…){ if(isOrderValid(req)){ saveOrder(req); … out.println(“<html><body>”); … } private void isOrderValid(…){ … } private void saveOrder(…){ … }}

Public class OrderServlet … { public void doGet(…){ … if(bean.isOrderValid(…)){ bean.saveOrder(req); … forward(“conf.jsp”); }}

<html> <body> <c:forEach items=“${order}”> … </c:forEach> </body></html>

isOrderValid()saveOrder()

------------------private state

Pure Servlet

Servlet

JSP

Java Bean

Page 11: JSPs Lecture 8 cs193i – Internet Technologies Summer 2004 Stanford University

JSP Big PictureJSP Big Picture

Server w/JSP Container

GET /hello.jsp

<html>Hello!</html>

Hello.jsp

HelloServlet.java

HelloServlet.class

Page 12: JSPs Lecture 8 cs193i – Internet Technologies Summer 2004 Stanford University

A JSP FileA JSP File

Page 13: JSPs Lecture 8 cs193i – Internet Technologies Summer 2004 Stanford University

<%@ Directive %><%@ Directive %><%@ page contentType="text/html" %><%@ taglib prefix="c" uri=http://java.sun.com/jstl/core %><html> <head> <title>JSP is Easy</title> </head> <body bgcolor="white"> <h1>JSP is as easy as ...</h1> <%-- Calculate the sum of 1 + 2 + 3 dynamically --%> 1 + 2 + 3 = <c:out value="${1 + 2 + 3}" /> </body></html>

Page 14: JSPs Lecture 8 cs193i – Internet Technologies Summer 2004 Stanford University

<%-- JSPComment --><%-- JSPComment --><%@ page contentType="text/html" %><%@ taglib prefix="c" uri=http://java.sun.com/jstl/core %><html> <head> <title>JSP is Easy</title> </head> <body bgcolor="white"> <h1>JSP is as easy as ...</h1> <%-- Calculate the sum of 1 + 2 + 3 dynamically --%> 1 + 2 + 3 = <c:out value="${1 + 2 + 3}" /> </body></html>

Page 15: JSPs Lecture 8 cs193i – Internet Technologies Summer 2004 Stanford University

Template TextTemplate Text<%@ page contentType="text/html" %><%@ taglib prefix="c" uri=http://java.sun.com/jstl/core %><html> <head> <title>JSP is Easy</title> </head> <body bgcolor="white"> <h1>JSP is as easy as ...</h1> <%-- Calculate the sum of 1 + 2 + 3 dynamically --%> 1 + 2 + 3 = <c:out value="${1 + 2 + 3}" /> </body></html>

Page 16: JSPs Lecture 8 cs193i – Internet Technologies Summer 2004 Stanford University

<%= expr ><%= expr >

Java expression whose output is spliced into HTML

<%= userInfo.getUserName() %><%= 1 + 1 %><%= new java.util.Date() %>

Translated to out.println(userInfo.getUserName()) ...

WARNING: Old School JSP! The new way is introduced after break.... you mayuse either, but Old School JSP is used sparingly nowadays

Page 17: JSPs Lecture 8 cs193i – Internet Technologies Summer 2004 Stanford University

<% code %><% code %>

Scriptlet: Add a whole block of code to JSP... passed through to JSP's service method

Page 18: JSPs Lecture 8 cs193i – Internet Technologies Summer 2004 Stanford University

<%@ page language="java" contentType="text/html" %><%@ page import="java.util.*" %><%@ taglib prefix="c" uri="http://java.sun.com/jstl/core" %><% // Create an ArrayList with test data ArrayList list = new ArrayList( ); Map author1 = new HashMap( ); author1.put("name", "John Irving"); author1.put("id", new Integer(1)); list.add(author1); Map author2 = new HashMap( ); author2.put("name", "William Gibson"); author2.put("id", new Integer(2)); list.add(author2); Map author3 = new HashMap( ); author3.put("name", "Douglas Adams"); author3.put("id", new Integer(3)); list.add(author3); pageContext.setAttribute("authors", list);%><html> <head> <title>Search result: Authors</title> </head> <body bgcolor="white"> Here are all authors matching your search critera: <table> <th>Name</th> <th>Id</th> <c:forEach items=“${authors}” var=“current”>

Page 19: JSPs Lecture 8 cs193i – Internet Technologies Summer 2004 Stanford University

<%@ page language="java" contentType="text/html" %><html> <head> <title>Browser Check</title> </head> <body bgcolor="white">

<% String userAgent = request.getHeader("User-Agent"); if (userAgent.indexOf("MSIE") != -1) { %> You're using Internet Explorer. <% } else if (userAgent.indexOf("Mozilla") != -1) { %> You're probably using Netscape. <% } else { %> You're using a browser I don't know about. <% } %> </body></html>

Page 20: JSPs Lecture 8 cs193i – Internet Technologies Summer 2004 Stanford University

<%! decl ><%! decl >

Turned into an instance variable for the servlet

What did I tell you about instance variables & multithreaded servlets?

Serious Race Conditions Here!

Page 21: JSPs Lecture 8 cs193i – Internet Technologies Summer 2004 Stanford University

<%@ page language="java" contentType="text/html" %><%! int globalCounter = 0;%><html> <head> <title>A page with a counter</title> </head> <body bgcolor="white"> This page has been visited: <%= ++globalCounter %> times. <p> <% int localCounter = 0; %> This counter never increases its value: <%= ++localCounter %> </body></html>

Declarations have serious multithreading issues!

Page 22: JSPs Lecture 8 cs193i – Internet Technologies Summer 2004 Stanford University

<%@ page language="java" contentType="text/html" %><%! int globalCounter = 0;%><html> <head> <title>A page with a counter</title> </head> <body bgcolor="white"> This page has been visited: <%= ++globalCounter %> times. <p> <% int localCounter = 0; %> This counter never increases its value: <%= ++localCounter %> </body></html>

Not saved between requests...!

Page 23: JSPs Lecture 8 cs193i – Internet Technologies Summer 2004 Stanford University

<%@ page language="java" contentType="text/html" %><%@ page import="java.util.Date" %><%! int globalCounter = 0; java.util.Date startDate; public void jspInit( ) { startDate = new java.util.Date( ); }

public void jspDestroy( ) { ServletContext context = getServletConfig().getServletContext( ); context.log("test.jsp was visited " + globalCounter + " times between " + startDate + " and " + (new Date( ))); }%><html> <head> <title>A page with a counter</title> </head> <body bgcolor="white"> This page has been visited: <%= ++globalCounter %> times since <%= startDate %>. </body></html>

No real need anymore, since we don't use instance variables!

Page 24: JSPs Lecture 8 cs193i – Internet Technologies Summer 2004 Stanford University

<jsp:include …><jsp:include …>

<jsp:include page="trailer.html“ flush="true" />

Page 25: JSPs Lecture 8 cs193i – Internet Technologies Summer 2004 Stanford University

Five Minute Five Minute BreakBreak

Page 26: JSPs Lecture 8 cs193i – Internet Technologies Summer 2004 Stanford University

Big Picture – Web AppsBig Picture – Web AppsDatabase

Legacy Applications

Java Applications

Web Service

Other…?

End User #1

End User #2

Web Server(Servlets/JSP)

Page 27: JSPs Lecture 8 cs193i – Internet Technologies Summer 2004 Stanford University

Invoking Dynamic CodeInvoking Dynamic Code(from JSPs)(from JSPs)

Call Java Code Directly(Expressions, Declarations, Scriptlets)

Call Java Code Indirectly(Separate Utility Classes, JSP calls methods)

Use Beans(jsp:useBean, jsp:getProperty, jsp:setProperty)

Use MVC architecture (servlet, JSP, JavaBean) Use JSP expression Language

(shorthand to access bean properties, etc) Use custom tags

(Develop tag handler classes; use xml-like custom tags)

Page 28: JSPs Lecture 8 cs193i – Internet Technologies Summer 2004 Stanford University

Invoking Dynamic CodeInvoking Dynamic Code(from JSPs)(from JSPs)

Call Java Code Directly(Expressions, Declarations, Scriptlets)

Call Java Code Indirectly(Separate Utility Classes, JSP calls methods)

Use Beans(jsp:useBean, jsp:getProperty, jsp:setProperty)

Use MVC architecture (servlet, JSP, JavaBean) Use JSP expression Language

(shorthand to access bean properties, etc) Use custom tags

(Develop tag handler classes; use xml-like custom tags)

Simple Application orSmall Development Team

Complex Application orBig Development Team

Page 29: JSPs Lecture 8 cs193i – Internet Technologies Summer 2004 Stanford University

Servlets and JSPsServlets and JSPs

Core Servlets and JavaServer Pages, 2nd Edition, Volumes 1 & 2. Marty Hall & Larry Brown

Page 30: JSPs Lecture 8 cs193i – Internet Technologies Summer 2004 Stanford University

Java BeansJava Beans

Purpose: Store Data Simple Object,

requires no argument constructor Properties accessible via get & set

methods

Page 31: JSPs Lecture 8 cs193i – Internet Technologies Summer 2004 Stanford University

Java BeansJava Beans

For a "foo" property, a java bean will respond to Type getFoo() void setFoo(Type foo)

For a boolean "bar" property, a java bean will respond to boolean isBar() void setBar(boolean bar)

Page 32: JSPs Lecture 8 cs193i – Internet Technologies Summer 2004 Stanford University

Java BeanJava Bean

int getCount()void setCount(int c)

String getS()void setS(String s)

int[] getFoo()void setFoo(int[] f)

int count;String s;int[] foo;

Page 33: JSPs Lecture 8 cs193i – Internet Technologies Summer 2004 Stanford University
Page 34: JSPs Lecture 8 cs193i – Internet Technologies Summer 2004 Stanford University

// MagicBean.java/* A simple bean that contains a single* "magic" string.*/public class MagicBean { private String magic; public MagicBean(String string) {

magic = string; } public MagicBean() {

magic = "Woo Hoo"; // default magic string } public String getMagic() {

return(magic); } public void setMagic(String magic) {

this.magic = magic; }}

Page 35: JSPs Lecture 8 cs193i – Internet Technologies Summer 2004 Stanford University

Java BeansJava Beans <jsp:useBean id="myBean"

class="com.foo.MyBean“ scope="request"/> <jsp:getProperty name="myBean“

property="lastChanged" /> <jsp:setProperty name="myBean“

property="lastChanged" value="<%= new Date()%>"/>

Example <jsp:usebean id="bean" class="MagicBean" /> <jsp:getProperty name="bean"

property="magic" />

Page 36: JSPs Lecture 8 cs193i – Internet Technologies Summer 2004 Stanford University

<!-- bean.jsp --><hr><h3>Bean JSP</h3>

<p>Have all sorts of elaborate, tasteful HTML ("presentation") surrounding the data we pull off the bean.

<p>Behold -- I bring forth the magic property from the Magic Bean...

<!-- bring in the bean under the name "bean" --><jsp:usebean id="bean" class="MagicBean" />

<table border=1><tr><td bgcolor=green><font size=+2>Woo</font> Hoo</td><td bgcolor=pink><font size=+3><td bgcolor=pink><font size=+3> <!-- the following effectively does bean.getMagic() --> <jsp:getProperty name="bean" property="magic" /></font></td><td bgcolor=yellow>Woo <font size=+2>Hoo</font></td></tr></table>

<!-- pull in content from another page at request time with a relative URL ref to another page --> <jsp:include page="trailer.html" flush="true" />

Page 37: JSPs Lecture 8 cs193i – Internet Technologies Summer 2004 Stanford University

public class HelloBean extends HttpServlet{ public void doGet(HttpServletRequest request, HttpServletResponse response)

throws IOException, ServletException { response.setContentType("text/html");

PrintWriter out = response.getWriter();out.println("<html>");out.println("<head>");out.println("<html>");out.println("<head>");String title = "Hello Bean";out.println("<title>" + title + "</title>");out.println("</head>");out.println("<body bgcolor=white>");out.println("<h1>" + title + "</h1>");out.println("<p>Let's see what Mr. JSP has to

contribute...");request.setAttribute("foo", "Binky");MagicBean bean = new MagicBean("Peanut butter sandwiches!");request.setAttribute("bean", bean);RequestDispatcher rd = getServletContext().getRequestDispatcher("/bean.jsp");rd.include(request, response);rd.include(request, response);out.println("<hr>");out.println("</body>");out.println("</html>");

} // Override doPost() -- just have it call doGet() public void doPost(HttpServletRequest request, HttpServletResponse response)

throws IOException, ServletException {

doGet(request, response); }}

Page 38: JSPs Lecture 8 cs193i – Internet Technologies Summer 2004 Stanford University

JSP TagsJSP Tags

Found in JSP Pages Look like HTML Tags

<blah attr=val>Foo</blah> Single Tag Format

<blah attr=val/>

Page 39: JSPs Lecture 8 cs193i – Internet Technologies Summer 2004 Stanford University

<%-- JSPComment --%><%-- JSPComment --%><%@ page contentType="text/html" %><%@ taglib prefix="c" uri="http://java.sun.com/jstl/core" %><html> <head> <title>JSP is Easy</title> </head> <body bgcolor="white"> <h1>JSP is as easy as ...</h1> <%-- Calculate the sum of 1 + 2 + 3 dynamically --%> 1 + 2 + 3 = <c:out value="${1 + 2 + 3}" /> </body></html>

Page 40: JSPs Lecture 8 cs193i – Internet Technologies Summer 2004 Stanford University

<%@ Directive %><%@ Directive %><%@ page contentType="text/html" %><%@ taglib prefix="c" uri="http://java.sun.com/jstl/core" %><html> <head> <title>JSP is Easy</title> </head> <body bgcolor="white"> <h1>JSP is as easy as ...</h1> <%-- Calculate the sum of 1 + 2 + 3 dynamically --%> 1 + 2 + 3 = <c:out value="${1 + 2 + 3}" /> </body></html>

Page 41: JSPs Lecture 8 cs193i – Internet Technologies Summer 2004 Stanford University

Page DirectivePage Directive

<%@ page import="package.class" %>

<%@ page import="java.util.*" %> <%@ page contentType="text/html"

%> <%

response.setContentType("text/html"); %>

Page 42: JSPs Lecture 8 cs193i – Internet Technologies Summer 2004 Stanford University

Include DirectiveInclude Directive

<%@ include file="Relative URL"> Included at Translation time May contain JSP code such as

response header settings, field definitions, etc... that affect the main page

Page 43: JSPs Lecture 8 cs193i – Internet Technologies Summer 2004 Stanford University

<jsp:include …><jsp:include …>

Include Files at Request Time <jsp:include

page="news/Item1.html"/> page attribute must point to a page

that is HTML or a page that produces HTML (via JSP, CGI, etc)...

Page 44: JSPs Lecture 8 cs193i – Internet Technologies Summer 2004 Stanford University

Scripting Element TagsScripting Element Tags

<%= expr %> <%! decl %> <% code %>

Page 45: JSPs Lecture 8 cs193i – Internet Technologies Summer 2004 Stanford University

Action ElementsAction Elements

Standard Actions JSTL (tag library) Actions Custom Actions

Page 46: JSPs Lecture 8 cs193i – Internet Technologies Summer 2004 Stanford University

Standard ActionsStandard Actions

<jsp:useBean>Makes a JavaBeans component available in a page

<jsp:getProperty>Gets a property value from a JavaBeans component and adds it to the response

<jsp:setProperty>Set a JavaBeans property value

<jsp:include>Includes the response from a servlet or JSP page during the request processing phase

Page 47: JSPs Lecture 8 cs193i – Internet Technologies Summer 2004 Stanford University

Standard ActionsStandard Actions

<jsp:forward>Forwards the processing of a request to servlet or JSP page

<jsp:param>Adds a parameter value to a request handed off to another servlet or JSP page using <jsp:include> or <jsp: forward>

<jsp:plugin>Generates HTML that contains the appropriate client browser-dependent elements (OBJECT or EMBED) needed to execute an applet with the Java Plug-in software

Page 48: JSPs Lecture 8 cs193i – Internet Technologies Summer 2004 Stanford University

Custom Actions (Tag Custom Actions (Tag Libraries)Libraries)

Can Define Your own! Description

Define Install Declare Use

Details in JavaServer Pages 2nd ed found on Safari Techbooks

Page 49: JSPs Lecture 8 cs193i – Internet Technologies Summer 2004 Stanford University

JSTL TagsJSTL Tags

<%@ taglib prefix="c"

uri="http://java.sun.com/jstl/core" %>

...

<c:out value="${1 + 2 + 3}" />

Page 50: JSPs Lecture 8 cs193i – Internet Technologies Summer 2004 Stanford University

JSP Standard Tag LibraryJSP Standard Tag Library

<%@ page contentType="text/html" %><%@ taglib prefix="c" uri="http://java.sun.com/jstl/core" %><html> <head> <title>JSP is Easy</title> </head> <body bgcolor="white"> <h1>JSP is as easy as ...</h1>

1 + 2 + 3 = <c:out value="${1 + 2 + 3}" /> </body></html>

Built on custom tag infrastructure

Page 51: JSPs Lecture 8 cs193i – Internet Technologies Summer 2004 Stanford University

JSTL Control TagsJSTL Control Tags

<%@ page contentType="text/html" %><%@ taglib prefix="c “uri="http://java.sun.com/jstl/core" %>

<c:if test="${2>0}">It's true that (2>0)!

</c:if>

<c:forEach items="${paramValues.food}" var="current"><c:out value="${current}" />&nbsp;

</c:forEach>

Page 52: JSPs Lecture 8 cs193i – Internet Technologies Summer 2004 Stanford University

Expression Language Expression Language MotivationMotivation

Limitations of MVC <%= ... %>, <% ... %>, <%! ... %> jsp:useBean, jsp:getProperty verbose clumsy scripting & expression elements

to do more complicated Java things With Expression Language

${expression} Short and readable and fluid, like

JavaScript

Page 53: JSPs Lecture 8 cs193i – Internet Technologies Summer 2004 Stanford University

Advantages of Expression Advantages of Expression Language (EL)Language (EL)

Simple & Concise Flexible (use in conjunction with tag

libraries & custom tags) Robust against Error

Page 54: JSPs Lecture 8 cs193i – Internet Technologies Summer 2004 Stanford University

Basic ArithmeticBasic Arithmetic

${1.2 + 2.3} => 3.5 <%= 1.2 + 2.3 %>

${3/0} => Infinity \${1} => ${1} ${10 mod 4} => 2

Page 55: JSPs Lecture 8 cs193i – Internet Technologies Summer 2004 Stanford University

Basic ComparisonsBasic Comparisons

${4.0 >= 3} => true ${4.0 ge 3} => true Not in Java ${100.0 == 100} => true ${(10*10) ne 100} => false Not in Java ${'hip' > 'hit'} => false Not in Java ${'a' < 'b'} => true Not in Java

Page 56: JSPs Lecture 8 cs193i – Internet Technologies Summer 2004 Stanford University

Implicit ObjectsImplicit Objects

${param.foo} => booyah ${param["foo"]} => booyah \${param["foo"]} => ${param["foo"]} ${header["host"]} => localhost:8080 ${header["accept"]} => */* ${header["user-agent"]} => Mozilla/5.0

(Macintosh; U; PPC Mac OS X; en-us) AppleWebKit/124 (KHTML, like Gecko) Safari/125

Page 57: JSPs Lecture 8 cs193i – Internet Technologies Summer 2004 Stanford University

FunctionsFunctions Implemented by Tag Libraries (Tag

Libaries, implemented as Static Methods) ${param["foo"]}

=> JSP 2.0 ${my:reverse(param["foo"])}

=> 0.2 PSJ ${my:reverse(my:reverse(param["foo"]))}

=> JSP 2.0 ${my:countVowels(param["foo"])}

=> 0

Page 58: JSPs Lecture 8 cs193i – Internet Technologies Summer 2004 Stanford University

ConditionalsConditionals

<TD ALIGN="RIGHT“ BGCOLOR=“${(oranges.total < 0) ? "RED" : "WHITE"}">

Page 59: JSPs Lecture 8 cs193i – Internet Technologies Summer 2004 Stanford University

package coreservlets;

public class Salesbean {private double q1, q2, q3, q4;

public SalesBean(double q1Sales, double q2Sales, double q3Sales, double q4Sales) {...

}

public double getQ1() {return(q1);}

public double getQ2() {return(q2);}...

}}

Page 60: JSPs Lecture 8 cs193i – Internet Technologies Summer 2004 Stanford University

package coreservlets;import java.io.*;import javax.servlet.*;import javax.servlet.http.*;

public class Conditionals extends HttpServlet {public void doGet(HttpServletRequest request, HttpServletResponse response)

throws ServletException, IOException {

SalesBean apples = new SalesBean(150.25, -75.25, 22.25, -33.57);SalesBean oranges = new SalesBean(-220.25, -49.57, 138.25, 12.25);

request.setAttribute("apples", apples);request.setattribute("oranges", oranges);RequestDispatcher dispatcher =

request.getRequestDispatcher("/el/conditionals.jsp");dispatcher.forward(request, response);

}}

Page 61: JSPs Lecture 8 cs193i – Internet Technologies Summer 2004 Stanford University

package coreservlets;import java.io.*;import javax.servlet.*;import javax.servlet.http.*;

public class Conditionals extends HttpServlet {public void doGet(HttpServletRequest request, HttpServletResponse response)

throws ServletException, IOException {

SalesBean apples = new SalesBean(150.25, -75.25, 22.25, -33.57);SalesBean oranges = new SalesBean(-220.25, -49.57, 138.25, 12.25);

request.setAttribute("apples", apples);request.setattribute("oranges", oranges);RequestDispatcher dispatcher =

request.getRequestDispatcher("/el/conditionals.jsp");dispatcher.forward(request, response);

}}

Page 62: JSPs Lecture 8 cs193i – Internet Technologies Summer 2004 Stanford University

...

<TD ALIGN="RIGHT" BGCOLOR=“${(oranges.total < 0) ? "RED" : "WHITE"}">

<TD ALIGN="RIGHT" BGCOLOR=“${(apples.q1 < 0) ? "RED" : "WHITE"}">

...

Page 63: JSPs Lecture 8 cs193i – Internet Technologies Summer 2004 Stanford University

EL ExamplesEL Examples

<input name="firstName“ value="${customer.firstName}">

<c:out value="${order.amount + 5}"/>

${order.amount + 5} {order['amount'] + 5}


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