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Struts 2 Email Validation

Last Updated : 28 Apr, 2025
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EmailValidator verifies that a given String field, if not empty, has a valid email address. It is utilized. Check to ensure that the string field has a valid email address and is not empty. Struts 2 validation is specified via XML or annotations. Manual validation within the action is also feasible, and it may be integrated with XML and annotation-driven validation. Validation is also dependent on the validation and workflow interceptors (which are both included in the default interceptor stack).

Example of Struts 2 Email Validation

XML 
<validators>
    <validator type="email">
        <param name="fieldName">myEmail</param>
        <message>Must provide a valid email</message>
    </validator>
</validators>
 

<field name="myEmail">
   <field-validator type="email">
      <message>Must provide a valid email</message>
   </field-validator>
</field>
 

<field name="myEmail">
   <field-validator type="email">
      <param name="regexExpression">${emailPattern}</param> 
      <param name="caseSensitiveExpression">${emailCaseSensitive}</param> 
      <param name="trimExpression">${trimEmail}</param> 
      <message>Must provide a valid email</message>
   </field-validator>
</field>

Struts 2 Email Validation step by step implementation

Step 1: Create index.jsp for input

This JavaScript website uses struts UI tags to generate a form. The user provides it with their email address, password, and name.

XML 
<%@ taglib uri="/struts-tags" prefix="s" %>  
<html>  
<head>  
<STYLE type="text/css">  
.errorMessage{color:red;}  
</STYLE>  
</head>  
<body>  
  
<s:form action="register">  
<s:textfield name="email" label="Enter Email Id"></s:textfield>  
<s:submit value="register"></s:submit>  
</s:form>  
  
</body>  
</html>

Step 2: Make the action class

The execute function is overridden by this action class, which derives from the ActionSupport class.

Java 
import org.geeksforgeeks.xwork2.ActionSupport;

public class Login extends ActionSupport{
    
    private String userName;
    private String email;
 
    
    public String execute(){
        return SUCCESS;    
    }    
 //generating getters and setters
    
    public String getUserName() {
        return userName;
    }
    public void setUserName(String userName) {
        this.userName = userName;
    }
 
    public String getEmail() {
        return email;
    }
 
    public void setEmail(String email) {
        this.email = email;
    }    
}

Step 3: Assemble the validation file

In this case, the validation is being carried out via bundled validators.

XML 
<!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="userName">
      <field-validator type="requiredstring">
         <param name="trim">true</param>
         <message>
            Username is required.
         </message>
      </field-validator>
   </field>
 
   <field name="email">
        <field-validator type="email">
         <message>
            Invalid email address.
         </message>
      </field-validator>
   </field>
</validators>

Step 4: Create struts.xml

This XML file specifies an interceptor called jsonValidatorWorkflowStack and an additional result called input.

XML 
<!DOCTYPE struts PUBLIC
"-//Apache Software Foundation//DTD Struts Configuration 2.0.1//EN"
"http://struts.apache.org/dtds/struts-2.0.1dtd">
 
<struts>
 
    <package name="user" extends="struts-default">
        <action name="Login" 
                  class="org.geeksforgeeks.action.Login">
          <result name="success">/welcome.jsp</result>
          <result name="input">/login.jsp</result>
        </action>
    </package>
 
</struts>

Step 5: Create a view component

It is a basic JavaScript file that displays the user's information.

XML 
<%@ taglib uri="/struts-tags" prefix="s"%>
<html>
    <head>
        <title>Struts 2 email validator/title>
    </head>
    <body>
        <h3>This is an email validator</h3>
 
        Hello <s:property value="userName" />
 
    </body>
</html>

Output:

Enter UserName and Email:

user name and email


Click on login button:

Click on login button


Conclusion

We hope you learned something new from this article on the Java Struts 2 Email Validation. EmailValidator verifies that a given String field, if not empty, has a valid email address. Struts 2 validation is specified via XML or annotations. Manual validation within the action is also feasible, and it may be integrated with XML and annotation-driven validation.


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