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Extending this already existing example of example registration web application,
that is using textfield, if, checkbox, and checkboxlist Struts2 Tags.
I am goind to add couple of Radio buttons to the exsiting screen, and
try to use Struts2 RadioTag.
Objective of this example is just to demonstrate ways to use Apache
Struts2 with Action class as plain POJO and screens are using Struts2 Tags,
such as IF Tag, TextField Tag, Checkbox Tag, CheckboxList Tag, and now
Radio Tag to be used in this example.
There are two screens, one is the main screen for user to enter certain
data, and the other screen displays this set of data in form of preview.
User data should flow to the Action class and to corresponding bean
and then this data will be shown in preview form to the user in another
screen.
As shown below:
As shown in this images, we have two screens, so two JSP pages, index.jsp
and preview.jsp files.
index.jsp
The main JSP file that holds some of textfield tag, form tag, checkbox tag
and chechboxlist tag, along with these Tags, I am going to ass Radio Tag as
well etc.
<%@ taglib uri="/struts-tags" prefix="struts2"%>
<html>
<body>
<h4>Example Registration Page</h4>
<struts2:bean id="so" name="sample.SubscriptionOptions"/>
<struts2:bean id="consentOption" name="sample.ConsentOptions"/>
<struts2:form method="post" action="myexample" namespace="/sample">
<table>
<tr><td><struts2:textfield key="myBean.userName" label="Name "/></td></tr>
<tr><struts2:textfield key="myBean.roll" label="Roll "/></td></tr>
<tr><td><struts2:textfield key="myBean.section" label="Section "/></td></tr>
<tr><struts2:textfield key="myBean.stdClass" label="Std/Class "/></td></tr>
<struts2:checkbox key="myBean.newsLetterOption" label="Subscription for News Letters "/>
<struts2:checkboxlist label="Other Subscription Options " key="myBean.subscriptionOptions" list="so" labelSeparator=":"/>
<struts2:radio label="You opinion " key="myBean.consentOptions" list="consentOption" labelSeparator=":"/>
<tr><td colspan="2"><struts2:submit value="Register"/></td></tr>
</table>
</struts2:form>
</body>
</html>
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Looking at this JSP file, one can find out the action class name and namespce
action name is myexample and namespace is /sample.
Looking at the struts.xml file, one can find the Action class.
This index.jsp page is just a form that will accept user input and pass on
all these values to corresponding fields in Action class, i.e, MyExample.java.
This will be much clearer once you shall see the corresponding struts.xml
file as shown below:
struts.xml
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE struts PUBLIC
"-//Apache Software Foundation//DTD Struts Configuration 2.0//EN"
"http://struts.apache.org/dtds/struts-2.0.dtd">
<struts>
<package name="goodexample" namespace="/sample" extends="struts-default">
<action name="myexample" class="sample.MyExample" method="preview">
<result name="preview">/preview.jsp</result>
</action>
</package>
</struts>
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So the Action class "sample.MyExample" has a private instance variable
as myBean and a preview method as follows:
Myexample.java
package sample;
/**
* This code is provided "AS IS" without any guaranty
* Use of this code only for educational and learning
* purpose only.
* Author: Amit
* Contact : usingframeworks@gmail.com
* Date: 16-Feb-2009
*/
import java.util.Map;
/**
* This is the Action POJO class
*/
public class MyExample {
private MyBean myBean;
public String preview() throws Exception {
return "preview";
}
public void setMyBean(MyBean argMyBean) {
myBean = argMyBean;
}
public MyBean getMyBean() {
return myBean;
}
}
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Now Mybean is the class that is holding all the variables those will
be accepting values from Struts2 Tags from index.jsp file.
Now I am going to add another variable "consentOptions" of type java.util.List
and corresponding setter and getter methods.
MyBean.java
package sample;
import java.util.List;
import java.util.ArrayList;
public class MyBean
{
private String userName;
private String roll;
private String section;
private String stdClass;
private List subscriptionOptions;
private List consentOptions;
private boolean newsLetterOption;
public String getUserName() {
return this.userName;
}
public void setUserName(String argUserName) {
userName = argUserName;
}
public String getRoll() {
return this.roll;
}
public void setRoll(String argRoll) {
roll = argRoll;
}
public String getSection() {
return this.section;
}
public void setSection(String argSection) {
section = argSection;
}
public String getStdClass() {
return this.stdClass;
}
public void setStdClass(String argStdClass) {
stdClass = argStdClass;
}
public List getSubscriptionOptions() {
return subscriptionOptions;
}
public void setSubscriptionOptions(List argSubscriptionOptions) {
subscriptionOptions = argSubscriptionOptions;
}
public void setNewsLetterOption(boolean argNewsLetterOption) {
newsLetterOption = argNewsLetterOption;
}
public boolean getNewsLetterOption() {
return newsLetterOption;
}
public void setConsentOptions(List argConsentOptions) {
consentOptions = argConsentOptions;
}
public List getConsentOptions() {
return consentOptions;
}
}
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And another class file that holds all the hard coded subscription options
for this example, those are to be shown in checkbox list as labels.
SubscriptionOptions.java
package sample;
import java.util.ArrayList;
public class SubscriptionOptions extends ArrayList
{
public SubscriptionOptions() {
super();
add("Technical Support");
add("Business Support");
add("HR Support");
add("Help Desk Emails");
}
}
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Just like Subscription options, I have introduced another class "ConsentOptions.java".
This class file holds all the labels for the radio buttons, like for this example,
these are "Agree" and "Disagree" .
ConsentOptions.java
package sample;
import java.util.ArrayList;
public class ConsentOptions extends ArrayList
{
public ConsentOptions() {
super();
add("Agree");
add("Disagree");
}
}
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Once all the fields in MyBean are populated with values from index.jsp
screen, then these values are to be shown in preview page, so comes the
preview.jsp file. There is a slight change in this preview.jsp file, to include
Radio button selectioned value, either Agree or Disagree.
preview.jsp
<%@ taglib uri="/struts-tags" prefix="struts2"%>
<html>
<head></head>
<body>
<h2>Preview Page</h2>
<table>
<tr><td>
<b><font color="green">Name : </font>
</td><td><struts2:property value="myBean.userName"/></td></tr>
<tr><td><b><font color="green">Roll No. : </font></b></td><td>
<struts2:property value="myBean.roll"/></td></tr>
<tr><td><b><font color="green">Section : </font>
</b></td><td><struts2:property value="myBean.section"/></td></tr>
<tr><td><b><font color="green">Std/Class : </font>
</b></td><td><struts2:property value="myBean.stdClass"/></td></tr>
<tr><td>
<b><font color="green">New Letter Subscription :</font></b></td><td>
<struts2:if test="myBean.newsLetterOption">
Yes
</struts2:if>
<struts2:else>
No
</struts2:else>
</td></tr>
<tr><td valign="top"><b><font color="green">Other Subscription Options:</font></b></td><td>
<struts2:iterator id="a" value="myBean.subscriptionOptions">
<struts2:property value="a"/>
<br>
</struts2:iterator>
</td></tr>
<tr><td valign="top"><b><font color="green">User consent Option selected :</font></b></td><td>
<struts2:iterator id="b" value="myBean.consentOptions">
<struts2:property value="b"/>
<br>
</struts2:iterator>
</td></tr>
</table>
</body>
</html>
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If you are interested in setting up this example in tomcat web server,
following are some other files details such as
web.xml
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE web-app
PUBLIC "-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN"
"http://java.sun.com/dtd/web-app_2_3.dtd">
<web-app>
<display-name>Struts Blank</display-name>
<filter>
<filter-name>sample-filter</filter-name>
<filter-class>
org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter
</filter-class>
</filter>
<filter-mapping>
<filter-name>sample-filter</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
</web-app>
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And as I am using Struts 2.1.6 version, then you may have to download
all dependent JAR files from
http://struts.apache.org/download.cgi
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If anything missed out , please let me know at
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