Java Server Pages v3.1 Workshop Solutions

8/14/2019 Java Server Pages v3.1 Workshop Solutions

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JavaServerPages

Solutions toWorkshops


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Java Servlets: Solutions to Workshops Page i

2004 SkillBuilders, Inc. V 3.1

Contents

Lesson 2: Using Basic JSP Constructs Workshop...........................................................................1Lesson 4: Include Files in JSP Workshop........................................................................................4Lesson 5: Using JavaBeans with JSPs Workshop...........................................................................6

Lesson 7: Custom Tag Library Basics Workshops ..........................................................................9Lesson 8: Adding Attributes to Custom Tag Workshop .................................................................11Lesson 8: Using PageContext Workshop ......................................................................................14Lesson 9: Using Body Content Workshop .....................................................................................17


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Jav Server Pages: Solutions to Workshops Page 1


Lesson 2: Using Basic JSPConstructs Workshop

Welcome.jsp

Welcome

Welcome !

We are pleased to have you as a customer!

Here is the information you entered:

Name:

Street address:

City:

State:

Zip:


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0) { %>

Credit Card #:

Note: Since you did not enter a credit card number, all ordersmust be paid in cash on the barrelhead!

register.html

Customer Registration

Customer RegistrationPlease enter the following information so we can process your order:

Name:

Street address:

City:


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State:

Zip:

Credit Card #:

web.xml


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Lesson 4: Include Files in JSPWorkshop

CompanyHeader.jsp

StudentSoft Online SuperStoreIf we don't have it, you don't need it!

Welcome.jsp

Welcome

Welcome !



Name:

Street address:


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City:

State:

Zip:

0) { %>

Credit Card #:

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 withJSPs Workshop

CustomerBean.java

/*Customer Bean with these read/write properties:

String userName

String streetString cityString stateString zipString 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

Welcome

Welcome !



Name:


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Street address:

City:

State:

Zip:

0) {%>

Credit Card #:

Unchanged members

CompanyHeader.jspRegister.html

NoCreditCard.html


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Lesson 7: Custom Tag LibraryBasics Workshops

CounterTest.jsp

A Hit Count Tag

This page has been accessed times!

ctlbasic.tld

1.01.1JSP course labsVarious tags for CTL labs

hitcountctlbasic.HitCountTagempty


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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

ctlbasic/WEB-INF/tlds/ctlbasic.tld


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Lesson 8: Adding Attributes toCustom Tag Workshop

CounterTest.jsp

A Hit Count Tag

Count for Huey (reset=true):

Count for Dewey (explicit reset=false):

Count for Louie (default reset):

Count for (parameter):

ctladvanced1.tld

1.01.1JSP course labsVarious tags for CTL labs

hitcount

ctladvanced1.HitCountTag


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empty

nametruetrue

resetfalsefalse

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");

}


// 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 hashtableInteger intCount = new Integer(iCount);

_htCounters.put(_strName, intCount);

}catch(java.io.IOException ex) {


}}

web.xml


ctladvanced1/WEB-INF/tlds/ctladvanced1.tld


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Lesson 8: Using PageContextWorkshop

CounterTest.jsp

A Hit Count Tag

Count for Huey (reset=true):

Count for Dewey (explicit reset=false):

Count for Louie (default reset):

Count for (parameter):

ctladvanced2.tld

1.01.1

JSP course labs


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Various tags for CTL labs

hitcountctladvanced2.HitCountTag

empty

nametruetrue

resetfalse

false

HitCountTag.java

package ctladvanced2;

//import java.util.Hashtable;


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 attributepublic void setName(String value) {_strName = value;

}

public void setReset(String value) {_bReset = value.toUpperCase().equals("TRUE");

}


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// Get initial countint 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 hashtableintCount = new Integer(iCount);

pageContext.setAttribute(_strName, intCount,PageContext.APPLICATION_SCOPE);}catch(java.io.IOException ex) {


}

}

web.xml


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Lesson 9: Using Body ContentWorkshop

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

Dorothy Com's Online StoreThe lowest prices in Cyberspace!

CompanyTag.java

package ctlbody;


public class CompanyTag extends TagSupport {

private static boolean _bCreatedBean = false;public static final String BEAN_NAME = "companyBean";


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

1.1JSP course labsVarious tags for CTL labs

company

ctlbody.CompanyTagJSP

namectlbody.NameTag

JSP

mottoctlbody.MottoTagJSP

CustomerBean.java

//*Customer Bean with these read/write properties:

String userNameString streetString cityString state

String zipString 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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//================================================// 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 stringString 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 attributeObject 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




ctlbody/WEB-INF/tlds/ctlbody.tld

welcome.jsp

Welcome

Welcome !




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Name:

Street address:

City:

State:

Zip:

0) {%>

Credit Card #:

Unchanged

Register.htmlNoCreditCard.html

Java Server Pages v3.1 Workshop Solutions

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