Struts 2 double validation example

The double validator checks that given floating-point number is within the specified range. It can be used in product price etc.

Parameters of double validator

There is 5 parameters defined for double validator.

Parameter	Description
fieldName	specifies the field name that is to be validated. It is required in Plain-Validator only.
minInclusive	specifies the minimum inclusive value. It is ignored bydefault.
maxInclusive	specifies the maximum inclusive value. It is ignored bydefault.
minExclusive	specifies the minimum exclusive value. It is ignored bydefault.
maxExclusive	specifies the maximum exclusive value. It is ignored bydefault.

Example of double validator

<validators>
 <!-- Plain Validator Syntax -->
          <validator type="double">
              <param name="fieldName">price</param>
              <param name="minInclusive">100.0</param>
              <param name="maxInclusive">10000.0</param>
              <message>Price must be between ${minInclusive} and ${maxInclusive}</message>
          </validator>
          
</validators>

<validators>
    <!-- Field Validator Syntax -->
          <field name="price">
              <field-validator type="double">
                 <param name="minInclusive">100.0</param>
                 <param name="maxInclusive">10000.0</param>
                 <message>Price must be between ${minInclusive} and ${maxInclusive}</message>
          </field-validator>
          </field>

</validators>

Full example of double 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="id" label="Product Id"></s:textfield>
<s:textfield name="price" label="Product Price"></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.javatpoint;

import com.opensymphony.xwork2.ActionSupport;

public class Register extends ActionSupport{
private int id;
private double price;

public int getId() {
	return id;
}

public void setId(int id) {
	this.id = id;
}

public double getPrice() {
	return price;
}

public void setPrice(double price) {
	this.price = price;
}

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="price">
  		<field-validator type="double">
  		  <param name="minInclusive">100.0</param>
          <param name="maxExclusive">9999.9</param>
  		
  		<message>Price must be between ${minInclusive} to ${maxExclusive}</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.javatpoint.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" %>

Product Id:<s:property value="id"/><br/>
Product price:<s:property value="price"/>

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