JavaServer Pages

Solutions to Workshops

Java Servlets: Solutions to Workshops

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Contents

Lesson 2: Using Basic JSP Constructs Workshop...........................................................................1 Lesson 4: Include Files in JSP Workshop ........................................................................................4 Lesson 5: Using JavaBeans with JSPs Workshop...........................................................................6 Lesson 7: Custom Tag Library Basics Workshops ..........................................................................9 Lesson 8: Adding Attributes to Custom Tag Workshop .................................................................11 Lesson 8: Using PageContext Workshop ......................................................................................14 Lesson 9: Using Body Content Workshop .....................................................................................17

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Jav Server Pages: Solutions to Workshops

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Lesson 2: Using Basic JSP Constructs Workshop

Welcome.jsp <TITLE>Welcome

Welcome <%= request.getParameter("userName") %>!

We are pleased to have you as a customer!

Here is the information you entered:

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<% String strCardNum = request.getParameter("cardNumber"); if(strCardNum.length() > 0) { %> <% } else { %> <% } %>

Name:	<%= request.getParameter("userName") %>
Street address:	<%= request.getParameter("street") %>
City:	<%= request.getParameter("city") %>
State:	<%= request.getParameter("state") %>
Zip:	<%= request.getParameter("zip") %>
Credit Card #:	<%= strCardNum %>
Note: Since you did not enter a credit card number, all orders must be paid in cash on the barrelhead!

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register.html <TITLE>Customer Registration

Customer Registration

Please enter the following information so we can process your order:

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Name:
Street address:
City:
State:
Zip:
Credit Card #:

web.xml <web-app>

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Lesson 4: Include Files in JSP Workshop

CompanyHeader.jsp

StudentSoft Online SuperStore

If we don't have it, you don't need it!

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Welcome.jsp <TITLE>Welcome <%@ include file="CompanyHeader.jsp" %>

Welcome <%= request.getParameter("userName") %>!

We are pleased to have you as a customer!

Here is the information you entered:

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<% String strCardNum = request.getParameter("cardNumber"); if(strCardNum.length() > 0) { %> <% } else { %> <% } %>

Name:	<%= request.getParameter("userName") %>
Street address:	<%= request.getParameter("street") %>
City:	<%= request.getParameter("city") %>
State:	<%= request.getParameter("state") %>
Zip:	<%= request.getParameter("zip") %>
Credit Card #:	<%= strCardNum %>
<jsp:include page="NoCreditCard.html" flush="true" />

---

NoCreditCard.html Note: Since you did not enter a credit card number, all orders must be paid in cash on the barrelhead!

And we mean it!!!

Register.html same as before

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Lesson 5: Using JavaBeans with JSPs Workshop

CustomerBean.java /* Customer String String String String String String

Bean with these read/write properties: userName street city state zip cardNumber

*/ package labs.jspbeans; public class CustomerBean { private String userName private String street private String city private String state private String zip private String cardNumber

= = = = = =

""; ""; ""; ""; ""; "";

//================================================ // String userName property //================================================ public String getUserName() { return userName; } public void setUserName(String value) { userName = value; } //================================================ // String street property //================================================ public String getStreet() { return street; } public void setStreet(String value) { street = value; }

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//================================================ // String city property //================================================ public String getCity() { return city; } public void setCity(String value) { city = value; } //================================================ // String state property //================================================ public String getState() { return state; } public void setState(String value) { state = value; } //================================================ // String zip property //================================================ public String getZip() { return zip; } public void setZip(String value) { zip = value; } //================================================ // String cardNumber property //================================================ public String getCardNumber() { return cardNumber; } public void setCardNumber(String value) { cardNumber = value; } }

Welcome.jsp <TITLE>Welcome <jsp:useBean id="customer" class="labs.jspbeans.CustomerBean" scope="session"> <jsp:setProperty name="customer" property="*" /> <%@ include file="CompanyHeader.jsp" %>

Welcome <jsp:getProperty name="customer" property="userName" />!

We are pleased to have you as a customer!

Here is the information you entered:

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property="street" />

property="city" />

property="state" />

property="zip" />

<% String strCardNum = customer.getCardNumber(); if(strCardNum.length() > 0) { %> <% } else { %> <% } %>

Name:	<jsp:getProperty name="customer" property="userName" />
Street address:	<jsp:getProperty name="customer"
City:	<jsp:getProperty name="customer"
State:	<jsp:getProperty name="customer"
Zip:	<jsp:getProperty name="customer"
Credit Card #:	<jsp:getProperty name="customer" property="cardNumber" />
<jsp:include page="NoCreditCard.html" flush="true" />

---

Unchanged members CompanyHeader.jsp Register.html NoCreditCard.html

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Lesson 7: Custom Tag Library Basics Workshops

CounterTest.jsp --> <%@ taglib uri='ctlbasic' prefix='basic' %> This page has been accessed times!

ctlbasic.tld 1.0 <jspversion>1.1 <shortname>JSP course labs Various tags for CTL labs hitcount ctlbasic.HitCountTag empty

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HitCountTag.java package ctlbasic; import javax.servlet.jsp.JspException; import javax.servlet.jsp.JspWriter; import javax.servlet.jsp.tagext.TagSupport; public class HitCountTag extends TagSupport { private static int _iInstCount; private static int _iCount; public HitCountTag() { System.out.println("Instantiating CounterTag #" + ++_iInstCount); } public int doStartTag() throws JspException { _iCount++; System.out.println("Incrementing counter to " + _iCount); try { JspWriter out = pageContext.getOut(); out.print(_iCount); } catch(java.io.IOException ex) { throw new JspException(ex.getMessage()); } return SKIP_BODY; } }

web.xml <web-app> ctlbasic /WEB-INF/tlds/ctlbasic.tld

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Lesson 8: Adding Attributes to Custom Tag Workshop

CounterTest.jsp <%@ taglib uri='ctladvanced1' prefix='adv1' %> Count for Huey (reset=true):

Count for Dewey (explicit reset=false):

Count for Louie (default reset):

Count for (parameter):

ctladvanced1.tld 1.0 <jspversion>1.1 <shortname>JSP course labs Various tags for CTL labs hitcount ctladvanced1.HitCountTag

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empty name <required>true true reset <required>false false

HitCountTag.java package ctladvanced1; import java.util.Hashtable; import javax.servlet.jsp.*; import javax.servlet.jsp.tagext.TagSupport; public class HitCountTag extends TagSupport { private static int _iInstCount; // private static int _iCount; private static Hashtable _htCounters = new Hashtable(); private String _strName; private boolean _bReset = false; public HitCountTag() { System.out.println("Instantiating CounterTag #" + ++_iInstCount); } public void setPageContext(PageContext pc) { super.setPageContext(pc); _strName = null; _bReset = false; } // Name attribute public void setName(String value) { _strName = value; } public void setReset(String value) { _bReset = value.toUpperCase().equals("TRUE"); } public int doStartTag() throws JspException { // Get initial count

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int iCount = 0; if(! _bReset && _htCounters.containsKey(_strName)) { Integer intCount = (Integer) _htCounters.get(_strName); iCount = intCount.intValue(); } iCount++; try { JspWriter out = pageContext.getOut(); out.print(iCount); // Put new count back into hashtable Integer intCount = new Integer(iCount); _htCounters.put(_strName, intCount); } catch(java.io.IOException ex) { throw new JspException(ex.getMessage()); } return SKIP_BODY; } }

web.xml <web-app> ctlbasic /WEB-INF/tlds/ctlbasic.tld ctladvanced1 /WEB-INF/tlds/ctladvanced1.tld

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Lesson 8: Using PageContext Workshop

CounterTest.jsp <%@ taglib uri='ctladvanced2' prefix='adv2' %> <% String strName = request.getParameter("name"); if(strName == null) strName = "No name"; %> Count for Huey (reset=true):

Count for Dewey (explicit reset=false):

Count for Louie (default reset):

Count for <%= strName %> (parameter):

ctladvanced2.tld 1.0 <jspversion>1.1 <shortname>JSP course labs

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Various tags for CTL labs hitcount ctladvanced2.HitCountTag empty name <required>true true reset <required>false false

HitCountTag.java package ctladvanced2; //import java.util.Hashtable; import javax.servlet.jsp.*; import javax.servlet.jsp.tagext.TagSupport; public class HitCountTag extends TagSupport { private static int _iInstCount; // private static int _iCount; // private static Hashtable _htCounters = new Hashtable(); private String _strName; private boolean _bReset = false; public HitCountTag() { System.out.println("Instantiating CounterTag #" + ++_iInstCount); } public void setPageContext(PageContext pc) { super.setPageContext(pc); _strName = null; _bReset = false; } // Name attribute public void setName(String value) { _strName = value; } public void setReset(String value) { _bReset = value.toUpperCase().equals("TRUE"); }

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public int doStartTag() throws JspException { // Get initial count int iCount = 0; Integer intCount = (Integer) pageContext.getAttribute(_strName, PageContext.APPLICATION_SCOPE); if(! _bReset && intCount != null) { Integer intCount = (Integer) _htCounters.get(_strName); iCount = intCount.intValue(); }

//

iCount++; try { JspWriter out = pageContext.getOut(); out.print(iCount); // Put new count back into hashtable intCount = new Integer(iCount); pageContext.setAttribute(_strName, intCount, PageContext.APPLICATION_SCOPE); } catch(java.io.IOException ex) { throw new JspException(ex.getMessage()); } return SKIP_BODY; } }

web.xml < <web-app> ctlbasic /WEB-INF/tlds/ctlbasic.tld ctladvanced1 /WEB-INF/tlds/ctladvanced1.tld ctladvanced2 /WEB-INF/tlds/ctladvanced2.tld

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Lesson 9: Using Body Content Workshop

CompanyBean.java /* Company Bean with these read/write properties: String name String motto */ package ctlbody; public class CompanyBean { private String name = ""; private String motto = ""; //================================================ // String name property //================================================ public String getName() { return name; } public void setName(String value) { name = value; } //================================================ // String motto property //================================================ public String getMotto() { return motto; } public void setMotto(String value) { motto = value; } public String toString() { return "Name: " + name + '\n' + "Motto: " + motto + '\n'; } }

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CompanyHeader.jsp <%@ taglib uri='ctlbody' prefix='bod' %> Dorothy Com's Online Store The lowest prices in Cyberspace! <jsp:useBean id="companyBean" class="ctlbody.CompanyBean" scope="application" />

<jsp:getProperty name="companyBean" property="name" />

<jsp:getProperty name="companyBean" property="motto" />

---

CompanyTag.java package ctlbody; import javax.servlet.jsp.*; import javax.servlet.jsp.tagext.TagSupport; public class CompanyTag extends TagSupport { private static boolean _bCreatedBean = false; public static final String BEAN_NAME = "companyBean"; public int doStartTag() throws JspException { if(_bCreatedBean) return SKIP_BODY; else { CompanyBean company = new CompanyBean(); pageContext.setAttribute(BEAN_NAME, company, PageContext.APPLICATION_SCOPE); return EVAL_BODY_INCLUDE; } } public int doEndTag() throws JspException { _bCreatedBean = true; return EVAL_PAGE; } }

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ctlbody.tld 1.0 <jspversion>1.1 <shortname>JSP course labs Various tags for CTL labs company ctlbody.CompanyTag JSP name ctlbody.NameTag JSP motto ctlbody.MottoTag JSP

CustomerBean.java //* Customer String String String String String String

Bean with these read/write properties: userName street city state zip cardNumber

*/ package ctlbody; public class CustomerBean { private String userName private String street private String city private String state private String zip private String cardNumber

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= = = = = =

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//================================================ // String userName property //================================================ public String getUserName() { return userName; } public void setUserName(String value) { userName = value; } //================================================ // String street property //================================================ public String getStreet() { return street; } public void setStreet(String value) { street = value; } //================================================ // String city property //================================================ public String getCity() { return city; } public void setCity(String value) { city = value; } //================================================ // String state property //================================================ public String getState() { return state; } public void setState(String value) { state = value; } //================================================ // String zip property //================================================ public String getZip() { return zip; } public void setZip(String value) { zip = value; } //================================================ // String cardNumber property //================================================ public String getCardNumber() { return cardNumber; } public void setCardNumber(String value) { cardNumber = value; } }

MottoTag.java package ctlbody; import javax.servlet.jsp.*;

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import javax.servlet.jsp.tagext.BodyTagSupport; public class MottoTag extends BodyTagSupport { public int doAfterBody() throws JspException { System.out.println("Processing motto"); // Get company bean from application attribute Object obj = pageContext.getAttribute(CompanyTag.BEAN_NAME, PageContext.APPLICATION_SCOPE); CompanyBean company = (CompanyBean) obj; System.out.println("Company bean before assigning motto:"); System.out.println(company); // Get body content as a string String content = bodyContent.getString(); company.setMotto(content); System.out.println("Company bean after assigning motto:"); System.out.println(company); return SKIP_BODY; } }

NameTag.java package ctlbody; import javax.servlet.jsp.*; import javax.servlet.jsp.tagext.BodyTagSupport; public class NameTag extends BodyTagSupport { public int doAfterBody() throws JspException { System.out.println("Processing motto"); // Get company bean from application attribute Object obj = pageContext.getAttribute(CompanyTag.BEAN_NAME, PageContext.APPLICATION_SCOPE); CompanyBean company = (CompanyBean) obj; System.out.println("Company bean before assigning name:"); System.out.println(company); // Get body content as a string String content = bodyContent.getString(); company.setName(content); System.out.println("Company bean after assigning name:"); System.out.println(company); return SKIP_BODY; } }

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web.xml <web-app> ctlbasic /WEB-INF/tlds/ctlbasic.tld ctladvanced1 /WEB-INF/tlds/ctladvanced1.tld ctladvanced2 /WEB-INF/tlds/ctladvanced2.tld ctlbody /WEB-INF/tlds/ctlbody.tld

welcome.jsp <TITLE>Welcome <jsp:useBean id="customer" class="ctlbody.CustomerBean" scope="session"> <jsp:setProperty name="customer" property="*" /> <%@ include file="CompanyHeader.jsp" %>

Welcome <jsp:getProperty name="customer" property="userName" />!

We are pleased to have you as a customer!

Here is the information you entered:

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property="userName" />

property="street" />

property="city" />

property="state" />

property="zip" />

<% String strCardNum = customer.getCardNumber(); if(strCardNum.length() > 0) { %> <% } else { %> <% } %>

Name:	<jsp:getProperty name="customer"
Street address:	<jsp:getProperty name="customer"
City:	<jsp:getProperty name="customer"
State:	<jsp:getProperty name="customer"
Zip:	<jsp:getProperty name="customer"
Credit Card #:	<jsp:getProperty name="customer" property="cardNumber" />
<jsp:include page="NoCreditCard.html" flush="true" />

---

Unchanged Register.html NoCreditCard.html

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