Friday, 10 July 2015

Struts 2 int validation example

The int validator checks that given number is witin the specified range. It can be used in productId, employeeId etc.

Parameters of int validator

There is 3 parameters defined for int validator.
ParameterDescription
fieldNamespecifies the field name that is to be validated. It is required in Plain-Validator only.
minspecifies the minimum value. It is ignored bydefault.
maxspecifies the maximum value. It is ignored bydefault.

Example of int validator

  1. <validators>  
  2.  <!-- Plain Validator Syntax -->  
  3.           <validator type="int">  
  4.               <param name="fieldName">age</param>  
  5.               <param name="min">16</param>  
  6.               <param name="max">50</param>  
  7.               <message>Age must be between ${min} and ${max}</message>  
  8.           </validator>  
  9.             
  10. </validators>  
  1. <validators>  
  2.     <!-- Field Validator Syntax -->  
  3.           <field name="age">  
  4.               <field-validator type="int">  
  5.                   <param name="min">16</param>  
  6.                   <param name="max">50</param>  
  7.                   <message>Age must be between ${min} and ${max}</message>  
  8.               </field-validator>  
  9.           </field>  
  10.   
  11. </validators>  

Full example of int 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
  1. <%@ taglib uri="/struts-tags" prefix="s" %>  
  2. <html>  
  3. <head>  
  4. <STYLE type="text/css">  
  5. .errorMessage{color:red;}  
  6. </STYLE>  
  7. </head>  
  8. <body>  
  9.   
  10. <s:form action="register">  
  11. <s:textfield name="id" label="Product Id"></s:textfield>  
  12. <s:textfield name="price" label="Product Price"></s:textfield>  
  13. <s:submit value="register"></s:submit>  
  14. </s:form>  
  15.   
  16. </body>  
  17. </html>  

2) Create the action class

This action class inherits the ActionSupport class and overrides the execute method.
RegisterAction.java
  1. package com.javatpoint;  
  2.   
  3. import com.opensymphony.xwork2.ActionSupport;  
  4.   
  5. public class Register extends ActionSupport{  
  6. private int id;  
  7. private double price;  
  8.   
  9. public int getId() {  
  10.     return id;  
  11. }  
  12.   
  13. public void setId(int id) {  
  14.     this.id = id;  
  15. }  
  16.   
  17. public double getPrice() {  
  18.     return price;  
  19. }  
  20.   
  21. public void setPrice(double price) {  
  22.     this.price = price;  
  23. }  
  24.   
  25. public String execute(){  
  26.     return "success";  
  27. }  
  28.   
  29. }  

3) Create the validation file

Here, we are using bundled validators to perform the validation.
Register-validation.xml
  1. <?xml version="1.0" encoding="UTF-8"?>  
  2.   
  3.   <!DOCTYPE validators PUBLIC   
  4.         "-//OpenSymphony Group//XWork Validator 1.0.2//EN"   
  5.         "http://www.opensymphony.com/xwork/xwork-validator-1.0.2.dtd">  
  6.   
  7.         <validators>  
  8.           
  9.                   
  10.         <field name="id">  
  11.         <field-validator type="int">  
  12.         <param name="min">1</param>  
  13.         <param name="max">999</param>  
  14.           
  15.         <message>Id must be between ${min} to ${max}</message>  
  16.         </field-validator>  
  17.         </field>  
  18.           
  19.           
  20.         </validators>  

4) Create struts.xml

This xml file defines an extra result by the name input, and an interceptor jsonValidatorWorkflowStack.
struts.xml
  1. <?xml version="1.0" encoding="UTF-8" ?>  
  2. <!DOCTYPE struts PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 2.1//EN" "http://struts.apache.org/dtds/struts-2.1.dtd">  
  3. <struts>  
  4. <package name="default" extends="struts-default">  
  5. <action name="register" class="com.javatpoint.Register">  
  6. <result name="input">index.jsp</result>  
  7. <result>welcome.jsp</result>  
  8. </action>  
  9.   
  10. </package>  
  11. </struts>      
  12.     
  13.    

5) Create view component

It is the simple jsp file displaying the information of the user.
welcome.jsp
  1. <%@ taglib uri="/struts-tags" prefix="s" %>  
  2.   
  3. Product Id:<s:property value="id"/><br/>  
  4. Product price:<s:property value="price"/>