Java Server Pages (JSP)
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1 Java Server Pages (JSP) What is JSP JSP simply puts Java inside HTML pages. You can take any existing HTML page and change its extension to ".jsp" instead of ".html". Scripting elements are used to provide dynamic pages
2 JSP and Servlets Each JSP page is turned into a Java servlet, compiled and loaded. This compilation happens on the first request. After the first request, the file doesn't take long to load anymore. Every time you change the JSP file, it will be re-compiled again. Java Server Page translator Java servlet source code compiler Java Servlet class file Generated servlets You can examine the source code produced by the JSP translation process. There is a directory called generated in Sun Java J2EE Application Server where you can find the source code. Note that the _jspservice method corresponds to the servlet service method (which is called by doget or dopost)
3 JSP elements (overview) Directives of the form %> Scripting elements Expressions of the form <%= expr %> Scriptlets of the form <% code %> Declarations of the form <%! code %> JSP Comments <% %> Standard actions Example: <jsp:usebean>... </jsp:usebean> Implicit variables like request, response, out JSP Directives They have the form name attribute1="...", attribute2="..."... %> page include taglib Specify page properties Include a file at translation time Specify custom tags
4 JSP Directive Examples Import java packages page import="java.util.*,java.sql.*" %> Multiple import statements page import="java.util.*" %> page import="java.sql.*" %> Including file at translation time include file="header.html" %> For include the path is relative to the JSP file JSP Scripting Elements: Expressions For an expression scripting element like <%= expr %>, expr is evaluated and the result is converted to a string and placed into the JSP's servlet output stream. In a Java servlet this would be equivalent to PrintWriter out = response.getwriter();... out.print(expr);
5 JSP Expression Examples Displaying request parameters (request is an implicit object available in a JSP) Your name is <%= request.getparameter("name") %> and your age is <%= request.getparameter("age") %> Doing calculations The value of pi is <%= Math.PI %> and the square root of two is <%= Math.sqrt(2.0) %> and today's date is <%= new java.util.date() %>. JSP Scripting Elements: Scriptlet For a scriplet <% statements %> the Java statements are placed in the translated servlet's _jspservice method body (which is called by either doget or dopost) public void _jspservice(httpservletrequest request, HttpServletResponse response) throws java.io.ioexception, ServletException {... statements...
6 JSP Scriplet Examples Check a request parameter <% String name = request.getparameter("name"); if (name == null) { %> <h3>please supply a name</h3> <% else { %> <h3>hello <%= name %></h3> <% %> In this example, there are 3 scriptlets elements and one expression element JSP Scripting Elements: Declaration For a declaration <%! declarations %> the Java statements are placed in the class outside the _jspservice method. Declarations can be Java instance variable declarations or Java methods // declarations would go here public void _jspservice(...) {...
7 JSP Declaration examples Declaring instance variables <%! private int count = 0; %>... The count is <%= count++ %>. Declaring methods <%! private int toint(string s) { return Integer.parseInt(s); %> Including Files Including files at translation time (when JSP is translated to a servlet) <%@ include file="filename" %> Including files at request time <jsp:include page="filename" flush = "true" />
8 A simple JSP <html> <head><title>jsp Test</title></head> <body> <h1>jsp Test</h1> Time: <%= new java.util.date() %> </body> </html> The expression scripting element <%=... %> is equivalent to the scriptlet <% out.print(...); %> The Implicit out Object In a scriptlet <%... %> you can use the out object to write to the output stream. Example: <% %> out.print("the sum is "); out.print("1 + 2 = " + (1+2));
9 The Implicit request Object In a scriptlet <%... %> you can use the request object to access GET/POST parameters. Example: <html> <head><title>...</title></head> <body> <h1>...</h1> <p><%= request.getparameter("greeting") %></p> </body></html> Example: HTML Form Submission Using GET <html> <head><title>jsp Processing...</title></head> <body> <h1>jsp Processing form with GET</h1> <form action= processform.jsp" method="get"> First name: <input type="text" name="firstname"><br /> Last name: <input type="text" name="lastname"> <p><input type="submit" name="button" value="submitname"></p> </form> </body> </html>
10 Example: HTML Form Submission Using POST <html> <head><title>jsp Processing...</title></head> <body> <h1>jsp Processing form with POST</h1> <form action= processform.jsp" method="post"> First name: <input type="text" name="firstname"><br /> Last name: <input type="text" name="lastname"> <p><input type="submit" name="button" value="submitname"></p> </form> </body> </html> Processing Submitted HTML Forms ProcessForm.jsp: <html> <head> <title>jsp Form Results</title> </head> <body> <h1>jsp Form Results</h1> Hello <%= request.getparameter("firstname") %> <%= request.getparameter("lastname") %> </body> </html>
11 Temperature Conversion Example page import="java.text.decimalformat" %> <html> <head><title>fahrenheit... Conversion</title></head> <body> <h1>fahrenheit to Celsius Conversion</h1> <% String self = request.getrequesturi(); if (request.getparameter("convert") == null) { %> <form action="<%= self %>" method="post"> Fahrenheit temperature: <input type="text" name="fahrenheit" /> <p><input type="submit" name="convert" value="convert to Celsius" /></p> </form> Temperature Conversion Example (Contd.) <% else { double fahr = 0.0; try { fahr = Double.parseDouble( request.getparameter("fahrenheit")); catch (NumberFormatException e) { // do nothing, accept default value
12 Temperature Conversion Example (Contd.) double celsius = (fahr ) * (5.0/9.0); DecimalFormat f2 = new DecimalFormat("0.00"); %> <%= f2.format(fahr) %>F is <%= f2.format(celsius) %>C <p><a href="<%= self %>">Another conversion</a> </p> <% %> </body> </html> Java Beans Special classes that encapsulate some data They have a default constructor get and set methods for data fields (properties) A bean can be constructed in JSP using <jsp:usebean id = "..." class = "..." /> If the bean already exists this statement does nothing
13 Setting properties To set a property of a bean use <jsp:setproperty name="..." property="..." value="..." /> To set a property using the value of a request parameter use <jsp:setproperty name="..." property="..." param="..." /> Getting properties To get a property of a bean use <jsp:getproperty name="..." property="..." />
14 A Greeting Bean package beans; public class Greeting { private String greeting; // the property public Greeting() { greeting = "Hello World"; public String getgreeting() { return greeting; public void setgreeting(string g) { greeting = (g == null)? "Hello World" : g; Java Beans Naming convention If the property name is greeting The get method must have the name getgreeting The set method must have the name setgreeting
15 Creating a Bean Create a bean and use default property <jsp:usebean id="hello" class="beans.greeting" /> Create a bean and set its property when it is constructed <jsp:usebean id="hello" class="beans.greeting" > <jsp:setproperty name="hello" property="greeting" value="hello JSP World" /> </jsp:usebean> Here <jsp:setproperty> is in the body of the <jsp:usebean> element. Creating a Bean (Contd.) Create a bean and set its property after it has been constructed <jsp:usebean id="hello" class="beans.greeting" /> <jsp:setproperty name="hello" property="greeting" value="hello JSP World" /> The <jsp:setproperty> tag is now outside the <jsp:usebean> tag so it will always set the property, not just when the bean is constructed
16 Example 1: Using Java Beans in JSP Files <jsp:usebean id="hello" class="beans.greeting" /> <jsp:setproperty name="hello" property="greeting" value="hello JSP World" /> <html> <head> <title>greeting JSP that uses a Greeting bean</title> </head> <body> <h1>greeting JSP that uses a Greeting bean</h1> <p><jsp.getproperty name="hello" property="greeting" /> </p> </body> </html> Example 2: Using Java Beans in JSP Files Two Beans: One initialized explicitly and the other is initialized using a request parameter <jsp:usebean id="greet1" class="beans.greeting" /> <jsp:usebean id="greet2" class="beans.greeting" /> <jsp:setproperty name="greet1" property="greeting" value="hello JSP World" /> <jsp:setproperty name="greet2" property="greeting" param="greeting" /> <html><head><title>greeting JSP using two Greeting beans</title></head><body> <h1>greeting JSP using two Greeting beans</h1> <p>1st bean: <jsp:getproperty name="greet1" property="greeting" /></p> <p>2nd bean: <jsp:getproperty name="greet2" property="greeting" /></p></body></html>
17 Example 3: Using Java Beans in JSP Files Three Beans: One initialized explicitly, one is initialized using a request parameter, and one is initialized using getparameter <jsp:usebean id="greet1" class="beans.greeting" /> <jsp:usebean id="greet2" class="beans.greeting" /> <jsp:usebean id="greet3" class="beans.greeting" /> <jsp:setproperty name="greet1" property="greeting" value="hello JSP World" /> <jsp:setproperty name="greet2" property="greeting" param="greeting" /> <%-- Following works but param method is better --%> <jsp:setproperty name="greet3" property="greeting" value="<%= request.getparameter(\"greeting\") %>" /> Reference COS 2206 JSP, Barry G. Adams, Department of Mathematics and Computer Science, Laurentain University.
![greeting" /> <jsp:setproperty name="greet1" property="greeting" value="hello JSP World" /> <jsp:setproperty name="greet2" property="greeting" param="greeting" /> <%-- Following works](/docs-images/47/20611940/images/page_17.jpg "but param method is better --%> <jsp:setproperty name=\"greet3\" property=\"greeting\" value=\"<%= request.getparameter(\\"greeting\\") %>\" /> Reference COS 2206 JSP, Barry G.")
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No no-argument constructor. No default constructor found
Every software developer deals with bugs. The really tough bugs aren t detected by the compiler. Nasty bugs manifest themselves only when executed at runtime. Here is a list of the top ten difficult and
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