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Struts 2 url validation example

The url validator checks that given value is string and a valid url. It can be used in website url, reciprocal links etc.

Parameters of url validator

There is only 1 parameter defined for url validator.

Parameter	Description
fieldName	specifies the field name that is to be validated. It is required in Plain-Validator only.

Example of url validator

<validators>
 <!-- Plain Validator Syntax -->
         <validator type="url">
             <param name="fieldName">website</param>
             <message>Invalid website url</message>
         </validator>
    
</validators>

<validators>
  <!-- Field Validator Syntax -->
  <field-validator type="url">
         <field name="website">
             <message>Invalid website url</message>
         </field>
</field-validator>

</validators>

Full example of url validator

1) Create index.jsp for input

This jsp page creates a form using struts UI tags. It receives name, password and email id from the user.

index.jsp

<%@ 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="url" label="Website URL"></s:textfield>
<s:submit value="register"></s:submit>
</s:form>

</body>
</html>

2) Create the action class

This action class inherits the ActionSupport class and overrides the execute method.

RegisterAction.java

package com.trainingtrains;

import com.opensymphony.xwork2.ActionSupport;

public class Register extends ActionSupport{
private String url;

public String getUrl() {
	return url;
}

public void setUrl(String url) {
	this.url = url;
}

public String execute(){
	return "success";
}

}

3) Create the validation file

Here, we are using bundled validators to perform the validation.

Register-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="url">
  		<field-validator type="requiredstring">
  		<message>URL can't be blank</message>
  		</field-validator>
  		<field-validator type="url">
  		<message>URL must be correct e.g. http://www.trainingtrains.com</message>
  		</field-validator>
  		</field>
  		
  		
  		</validators>

4) Create struts.xml

This xml file defines an extra result by the name input, and an interceptor jsonValidatorWorkflowStack.

struts.xml

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE struts PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 2.1//EN" "http://struts.apache.org/dtds/struts-2.1.dtd">
<struts>
<package name="default" extends="struts-default">
<action name="register" class="com.trainingtrains.Register">
<result name="input">index.jsp</result>
<result>welcome.jsp</result>
</action>
</package>
</struts>    

5) Create view component

It is the simple jsp file displaying the information of the user.

welcome.jsp

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

URL is:<s:property value="url"/>

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