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Struts 2 double validation

Last Updated : 28 Apr, 2025
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The Struts 2 Framework's Double Validator determines whether or not the input is double. The error message is generated if the input is not twice. The input range can also be verified using a double validator. This example shows how to check the input range using a double validator.

Plain validator Syntax of double validator

The purpose of the double validator is to verify that the double falls within a certain range.

<validators> 
  <validator type="double">
    <param name=”fieldName">fieldName</param>
    <param name="min">minDouble</param>
    <param name="max">maxDouble</param>
    <message>message string</message>
  </validator>
</validators>

Parameters of double validator

  • minExclusive:The minimal exclusive value is specified by minExclusive. By default, it is disregarded.
  • minInclusive : The minimal inclusive value is specified by minInclusive. By default, it is disregarded.
  • maxExclusive: The maximum inclusive value is indicated by maxInclusive. By default, it is disregarded.
  • fieldName:The field name that has to be verified is specified by fieldName. Only in Plain-Validator is it necessary.

Struts 2 double validation

index.jsp for input

Using struts UI tags, this jsp website generates a form. The user provides it with their name, password, and email address.

HTML 
<html>  
<head>  
<STYLE type="text/css">  
.errorMessage{color:red;}  
</STYLE>  
</head>  
<body>  
  
<s:form action="login">  
<s:textfield name="id" label="UserName"></s:textfield>  
<s:textfield name="price" label="Amount"></s:textfield>  
<s:submit value="login"></s:submit>  
</s:form>  
  
</body>  
</html>

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//EN"
"http://struts.apache.org/dtds/struts-2.1.1.dtd">
 
<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>

Action class

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

Java 
package org.geeksforgeeks;  
  
import com.opensymphony.xwork2.ActionSupport;
 
public class Login extends ActionSupport{
    
    private String userName;
    private double amount;
 

    public String execute(){
        return SUCCESS;    
    }    
    //getters and setters
    public String getUserName() {
        return userName;
    }
    public void setUserName(String userName) {
        this.userName = userName;
    }
 
    public double getAmount() {
        return amount;
    }
 
    public void setAmount(double amount) {
        this.amount = amount;
    }
 
}

Validation file

Bundled validators are being used here to carry out the validation.

XML 
<?xml version="1.5" encoding="UTF-8"?>  
  
  <!DOCTYPE validators PUBLIC   
        "-//geeksforgeeks//XWork Validator 1.0.2//EN"   
        "http://https://www.geeksforgeeks.org//xwork/xwork-validator-2.1.7.dtd">  
  
        <validators>  
          
        <field name="price">  
        <field-validator type="double">  
          <param name="minInclusive">200.0</param>  
          <param name="maxExclusive">9999.9</param>  
          
        <message>Price must be between ${minInclusive} to ${maxExclusive}</message>  
        </field-validator>  
        </field>  
        </validators>

View component

The user's information is shown in a basic JavaScript file.

XML 
<%@ taglib uri="/struts-tags" prefix="s"%>
<html>
    <head>
        <title>Struts 2 double validator</title>
    </head>
    <body>
        <h3>This is a double validator example.</h3>
 
        Hello <s:property value="UserName" />
 
    </body>
</html>

Output:

Output Screen

Conclusion

The Struts 2 Framework's Double Validator determines whether or not the input is double. The error message is generated if the input is not twice. The input range can also be verified using a double validator. This example shows how to check the input range using a double validator.


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