Struts2 iterator example

s:iterator:

The iterator tag is used to iterate over a value. The value can be any of the java.util.Collection or java.util.Iterator.

Syntax:

<s:iterator value="fieldValue"> //do something </s:iterator>
<s:iterator value="fieldValue"> //do something </s:iterator>

Note: The IteratorStatus class is used to get the iteration status details like count, even, odd etc. To use this functionality we have to declare the IteratorStatus class in the status attribute of the iterator tag.

Example:

index.jsp

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> <title>Struts 2 s:iterator control tag example</title> <META HTTP-EQUIV="Refresh" CONTENT="0;URL=Test.action"> </head> <body> </body> </html>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> <title>Struts 2 s:iterator control tag example</title> <META HTTP-EQUIV="Refresh" CONTENT="0;URL=Test.action"> </head> <body> </body> </html>

web.xml

<?xml version="1.0" encoding="UTF-8"?> <web-app version="2.5" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"> <filter> <filter-name>struts2</filter-name> <filter-class> org.apache.struts2.dispatcher.ng. filter.StrutsPrepareAndExecuteFilter </filter-class> </filter> <filter-mapping> <filter-name>struts2</filter-name> <url-pattern>/*</url-pattern> </filter-mapping> <welcome-file-list> <welcome-file>index.jsp</welcome-file> </welcome-file-list> </web-app>
<?xml version="1.0" encoding="UTF-8"?> <web-app version="2.5" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"> <filter> <filter-name>struts2</filter-name> <filter-class> org.apache.struts2.dispatcher.ng. filter.StrutsPrepareAndExecuteFilter </filter-class> </filter> <filter-mapping> <filter-name>struts2</filter-name> <url-pattern>/*</url-pattern> </filter-mapping> <welcome-file-list> <welcome-file>index.jsp</welcome-file> </welcome-file-list> </web-app>

struts.xml

<!DOCTYPE struts PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 2.0//EN" "http://struts.apache.org/dtds/struts-2.0.dtd"> <struts> <package name="default" extends="struts-default"> <action name="Test" class="com.w3spoint.action.Test"> <result name="success">/test.jsp</result> </action> </package> </struts>
<!DOCTYPE struts PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 2.0//EN" "http://struts.apache.org/dtds/struts-2.0.dtd"> <struts> <package name="default" extends="struts-default"> <action name="Test" class="com.w3spoint.action.Test"> <result name="success">/test.jsp</result> </action> </package> </struts>

Test.java

import java.util.ArrayList; import java.util.List; import com.opensymphony.xwork2.ActionSupport; /** * This class is used as an action class. * @author w3spoint */ public class Test extends ActionSupport{ //data members private List<String> subjectList; //business logic public String execute(){ subjectList = new ArrayList<String>(); subjectList.add("java"); subjectList.add("DBMS"); subjectList.add("Networing"); subjectList.add("Compiler"); return SUCCESS; } //getter setters public List<String> getSubjectList() { return subjectList; } public void setSubjectList(List<String> subjectList) { this.subjectList = subjectList; } }
import java.util.ArrayList; import java.util.List; import com.opensymphony.xwork2.ActionSupport; /** * This class is used as an action class. * @author w3spoint */ public class Test extends ActionSupport{ //data members private List<String> subjectList; //business logic public String execute(){ subjectList = new ArrayList<String>(); subjectList.add("java"); subjectList.add("DBMS"); subjectList.add("Networing"); subjectList.add("Compiler"); return SUCCESS; } //getter setters public List<String> getSubjectList() { return subjectList; } public void setSubjectList(List<String> subjectList) { this.subjectList = subjectList; } }

welcome.jsp

<%@ taglib uri="/struts-tags" prefix="s"%> <html> <head> <title>Struts 2 s:iterator control tag example</title> </head> <body> <h3>This is a s:iterator control tag example.</h3> <h4>Simple iterator</h4> <s:iterator value="subjectList"> <s:property/><br/> </s:iterator> <h4>Iterator with iteration details</h4> <s:iterator value="subjectList" status="subjectListStatus"> <s:if test="#subjectListStatus.first == true"> First Value: <s:property/> </s:if> <s:elseif test="#subjectListStatus.last == true"> Last Value: <s:property/> </s:elseif> <s:else> <s:property/> </s:else> <br/> </s:iterator> </body> </html>
<%@ taglib uri="/struts-tags" prefix="s"%> <html> <head> <title>Struts 2 s:iterator control tag example</title> </head> <body> <h3>This is a s:iterator control tag example.</h3> <h4>Simple iterator</h4> <s:iterator value="subjectList"> <s:property/><br/> </s:iterator> <h4>Iterator with iteration details</h4> <s:iterator value="subjectList" status="subjectListStatus"> <s:if test="#subjectListStatus.first == true"> First Value: <s:property/> </s:if> <s:elseif test="#subjectListStatus.last == true"> Last Value: <s:property/> </s:elseif> <s:else> <s:property/> </s:else> <br/> </s:iterator> </body> </html>

Output:

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