Struts 2 E-mail Validator

The email validator in Struts 2 Framework checks whether a given String field is empty or not and contains a valid email address or not. If the entered value does not match with the email type then the e-mail validator generates an error message.

The error message is supplied between the <message> </message> tag. The following example demonstrates how to use an email validator to check the entered value.

Follow the steps to develop the email validator example:

Step 1: Create the struts.xml file and add the following xml snippet in the struts.xml file.


<?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>

    <!-- Rose India Struts 2 Tutorials -->

    <constant name="struts.enable.DynamicMethodInvocation" value="false" />

    <constant name="struts.devMode" value="true" />



    <package name="roseindia" namespace="/roseindia" extends="struts-default">

    

    <!-- Add actions here -->



    <!-- Email validation -->



    <action name="emailValidation">

      <result>/pages/emailInputForm.jsp</result>

    </action>



    <action name="emailValidation1" class="net.roseindia.EmailVaLidationAction">

      <result name="input">/pages/emailInputForm.jsp</result>

      <result name="error">/pages/emailInputForm.jsp</result>

      <result>/pages/emailSuccess.jsp</result>

   </action>



         <!-- Add actions here -->

    </package>





    <!-- Add packages here -->



</struts>

Step 2 : Create an input jsp form. as shown below:

emailInputForm.jsp


<%@ taglib prefix="s" uri="/struts-tags" %>



<html>



<head>



<title>Email input form</title>

 <link href="<s:url value="/css/main.css"/>" rel="stylesheet"

          type="text/css"/>

      <s:head/>

</head>



<body>

  

  <s:form method="POST" action="emailValidation1">

   </td>

  </tr>

    <s:textfield label="Enter Email Address" name="myEmail" />

    <s:submit />

  </s:form>



</body>



</html>

Step 3 : Create an Action class.

EmailVaLidationAction.java


package net.roseindia;

import com.opensymphony.xwork2.ActionSupport;



public class EmailVaLidationAction extends ActionSupport {



  private String myEmail;



  public void setMyEmail(String myEmail){

    this.myEmail = myEmail;

  }

  public String getMyEmail(){

    return myEmail;

  }

}

Step 4 : Create an e-mail validator as:.

The validation.xml format is either <ActionClassName>-validation.xml or <ActionClassName>-<ActionAliasName>-validation.xml.

email validator :
This Field Validator checks whether a given String field is empty or not and contains a valid email address or not. If it has valid email type then the user is sent to the emailSuccess.jsp page. Otherwise, it displays the message given in the xml file (e.g. Please enter a valid email.).
The email validator takes the following parameters:

fieldName - This is the field name of validator that validates. It is required only if the user is using Plain-Validator Syntax .

EmailVaLidationAction-validation.xml


<?xml version="1.0" encoding="UTF-8"?>

<!DOCTYPE validators PUBLIC 

      "-//OpenSymphony Group//XWork Validator 1.0.2//EN" 

      "http://www.opensymphony.com/xwork/xwork-validator-1.0.2.dtd">

      

<validators>



  <field name="myEmail">

    <field-validator type="email">

       <message>Please enter a valid email</message>

    </field-validator>

  </field>



</validators>

When the correct email address is entered then the user gets the emailSuccess.jsp page

emailSuccess.jsp


<%@page language="java" %>

<html>



<head>

  <title>Correct entry</title>

</head>



<body>

<b>Welcome to </b><%=request.getParameter("myEmail") %>!

</body>



</html>

Output:

When this application executes the user gets the following output :

If you enter the wrong email address then you get a message as shown:

Again, If you enter the wrong email address then you get:

If you enter the correct email address:

Then you get: