Validation using Struts2 Framework and XML file with Eclipse Indigo

In this Tutorial we are performing server side validation using Struts2 framework on various fields eg. name,email etc.

Project Structure in Project Explorer:

Firstly Download Struts2 Jars

How to Use Struts2 Jars by two ways:
1. Put all downloaded jars into lib folder of your project.

2. The way i am using Jars, For More Details Read How to set Struts2 Environment
Web Deployment Assembly

contactus.jsp
create a user input page.
 <%@ page language="java" contentType="text/html; charset=ISO-8859-1"  
      pageEncoding="ISO-8859-1"%>  
      <%@ taglib prefix="s" uri="/struts-tags"%>  
      <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">  
 <html>  
 <head>  
 <meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">  
 <title>Contact Us</title>  
 </head>  
 <body bgcolor="brown">  
      <h1>Contact Information</h1>  
      <hr>  
            <s:form action="customer.action" method="post" >  
            <s:textfield name="Name" key="label.name" size="40" />  
            <s:textfield name="Age" key="label.age" size="40" />  
            <s:textfield name="Email" key="label.email" size="40" />  
             <s:textarea name="Message" key="label.msg" rows="10" cols="40" ></s:textarea>  
            <s:submit key="label.customer" align="center" />  
         </s:form>  
 </body>  
 </html>  

success.jsp
create a user's success page.
 <%@ page language="java" contentType="text/html; charset=ISO-8859-1"  
   pageEncoding="ISO-8859-1"%>  
   <%@ taglib prefix="s" uri="/struts-tags"%>  
 <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">  
 <html>  
 <head>  
 <meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">  
 <title>success</title>  
 </head>  
 <body bgcolor="lightblue">  
 <center><h3>  
 Hello! <s:property value="name"/></h3></center>  
 </body>  
 </html>  

ContactAction.java
create a Action java class.
 package in.blog.webideaworld;  
 import com.opensymphony.xwork2.ActionSupport;  
 @SuppressWarnings("serial")  
 public class ContactAction extends ActionSupport {  
      private String name;  
      private int age;  
      private String email;  
      private String message;  
      public String getName() {  
           return name;  
      }  
      public void setName(String name) {  
           this.name = name;  
      }  
      public int getAge() {  
           return age;  
      }  
      public void setAge(int age) {  
           this.age = age;  
      }  
      public String getEmail() {  
           return email;  
      }  
      public void setEmail(String email) {  
           this.email = email;  
      }  
      public String getMessage() {  
           return message;  
      }  
      public void setMessage(String message) {  
           this.message = message;  
      }  
      public String execute() throws Exception{  
           return SUCCESS;  
      }  
 }  

ContactAction-validation.xml
Create validators in XML file and the format for the validatiors xml file is <ActionClassName>-validation.xml
 <!DOCTYPE validators PUBLIC "-//Apache Struts//XWork Validator 1.0.3//EN"  
           "http://struts.apache.org/dtds/xwork-validator-1.0.3.dtd">  
 <validators>  
      <field name="Name">  
           <field-validator type="requiredstring">  
                <message key="errors.required" />  
           </field-validator>  
           <field-validator type="regex">  
       <param name="expression">[a-zA-Z]{2,20}</param>  
       <message key="errors.invalid" />  
     </field-validator>  
      </field>  
      <field name="Age">  
    <field-validator type="required">  
      <message key="errors.required" />  
    </field-validator>  
    <field-validator type="int">  
      <param name="min">18</param>  
      <param name="max">100</param>  
      <message key="errors.agerange" />  
    </field-validator>  
  </field>  
      <field name="Email">  
           <field-validator type="requiredstring">  
                <message key="errors.required" />  
           </field-validator>  
           <field-validator type="email">  
                <message key="errors.invalid" />  
           </field-validator>  
      </field>  
      <field name="Message">  
           <field-validator type="requiredstring">  
                <message key="errors.required" />  
           </field-validator>  
        <field-validator type="stringlength">  
       <param name="minLength">4</param>  
       <param name="maxLength">200</param>  
       <message key="errors.msgrange"/>  
   </field-validator>  
      </field>  
 </validators>  

ApplicationResources.properties
 label.name=Name  
 label.age=Age  
 label.email=Email  
 label.msg=Message  
 label.customer=Send  
 errors.invalid=${getText(fieldName)} is invalid.  
 errors.required=${getText(fieldName)} is required.  
 errors.agerange=Age must be between ${min} and ${max}, current value is ${Age}.  
 errors.msgrange=Message length must be between ${minLength} to ${maxLength} characters.  

struts.xml
set result name="success" for success.jsp and name="input" for contactus.jsp for validation messages to show up on input page.
 <?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>  
        <constant name="struts.custom.i18n.resources" value="ApplicationResources" />   
   <package name="default" namespace="/" extends="struts-default">  
     <action name="customer" class="in.blog.webideaworld.ContactAction" method="execute" >  
     <result name="success">success.jsp</result>  
     <result name="input">contactus.jsp</result>  
     </action>  
   </package>  
   </struts>  

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

Download Code

View in Browser: 
checking validation without input values:
checking validation with input values:
success page:


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