Struts 2 Sort tag sample code
To sort list on JSP page in struts 2 application. Struts 2 provide sort tag which sort the list using comparator. Please see example below:
- Create maven project: Struts2Iterator
- Final project structure:
- IteratorTagExampleAction.java
package com.javahonk.action; import java.util.ArrayList; import java.util.List; import org.apache.struts2.convention.annotation.Action; import org.apache.struts2.convention.annotation.Result; import org.apache.struts2.convention.annotation.Results; import com.opensymphony.xwork2.ActionSupport; @Results({ @Result(name = "error", location = "/iterator.jsp"), @Result(name = "input", location = "/iterator.jsp")}) public class IteratorTagExampleAction extends ActionSupport { private static final long serialVersionUID = 1L; private List<Person> personList = new ArrayList<Person>(); @Override @Action(value = "/iteratorTagExampleAction") public String execute() throws Exception { personList.add(new Person("Java", "Honk", "NY")); personList.add(new Person("Ramesh", "Arrepu", "NY")); personList.add(new Person("Igor", "Vornovitsky", "NY")); personList.add(new Person("Bob", "Sidebottom", "NY")); personList.add(new Person("Sunil", "Garg", "NY")); personList.add(new Person("Mike", "Lee", "NY")); return ActionSupport.INPUT; } public List<Person> getPersonList() { return personList; } public void setPersonList(List<Person> personList) { this.personList = personList; } }
- Person.java
package com.javahonk.action; import java.io.Serializable; public class Person implements Serializable{ private static final long serialVersionUID = 1L; private String firstName; private String lastName; private String location; public Person(String firstName, String lastName, String location) { super(); this.firstName = firstName; this.lastName = lastName; this.location = location; } public String getFirstName() { return firstName; } public void setFirstName(String firstName) { this.firstName = firstName; } public String getLastName() { return lastName; } public void setLastName(String lastName) { this.lastName = lastName; } public String getLocation() { return location; } public void setLocation(String location) { this.location = location; } }
- PersonComparator.java:
package com.javahonk.action; import java.util.Comparator; public class PersonComparator implements Comparator<Person>{ public int compare(Person o1, Person o2) { return o1.getFirstName().compareTo(o2.getFirstName()); } }
- iterator.jsp:
<%@ page language="java" contentType="text/html; charset=ISO-8859-1" pageEncoding="ISO-8859-1"%> <%@ taglib prefix="s" uri="/struts-tags"%> <?xml version="1.0" encoding="UTF-8" ?> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html> <head> <title>Struts 2 s:iterator tag sample code</title> <s:head /> </head> <body> <h2 style="color: green"> <s:text name="label.welcome" /> </h2> <h3 style="color: green"> <s:text name="label.iterator" /> </h3> <s:form action="iteratorTagExampleAction" namespace="/" method="post" name="strutsForm"> <table cellspacing="0" cellpadding="0" border="1" width="500"> <tr style="font-weight: bold"> <td><s:text name="label.firstName" /></td> <td><s:text name="label.lastName" /></td> <td><s:text name="label.location" /></td> </tr> <s:iterator value="personList"> <tr> <td><s:property value="firstName" /></td> <td><s:property value="lastName" /></td> <td><s:property value="location" /></td> </tr> </s:iterator> </table> <h3 style="color: green"> <s:text name="label.iterator.sort" /> </h3> <s:bean name="com.javahonk.action.PersonComparator" var="personComparator" /> <table cellspacing="0" cellpadding="0" border="1" width="500"> <tr style="font-weight: bold"> <td><s:text name="label.firstName" /></td> <td><s:text name="label.lastName" /></td> <td><s:text name="label.location" /></td> </tr> <s:sort comparator="personComparator" source="personList"> <s:iterator> <tr> <td><s:property value="firstName" /></td> <td><s:property value="lastName" /></td> <td><s:property value="location" /></td> </tr> </s:iterator> </s:sort> </table> </s:form> </body> </html>
- Web page output:
For more information please read this tutorial
Download Project: Struts2Iterator
