In this section, you will see the use how to validate form field or user
input in struts2.
Struts2 used a xml file for validation called validation.xml.
Struts2 provides two ways for defining validator in XML file.
Field validator- It works on single field of form. It define validator per field base.
| <validators> <field name="username"> <field-validator type="required"> <message>User name required.</message> </field-validator> </field> </validators> |
Here, you will see a email validation example.
index.jsp
|
<%@ page language="java" contentType="text/html; charset=ISO-8859-1" pageEncoding="ISO-8859-1"%> <%@taglib uri="/struts-tags" prefix="s" %>< html>< head><title>Email_Validator_Example</title><s:head/></head>< body>Email_Validator_Example.....< s:form action="emailvalidation.action">< s:textfield name="email" label="Email-Id :"></s:textfield>< s:submit></s:submit></s:form></ body></ html> |
EmailValidationAction.java (Action )
|
package roseindia;import com.opensymphony.xwork2.ActionSupport;public class EmailValidationAction extends ActionSupport { private String email; public String getEmail() { return email; }public void setEmail(String email) { this.email = email; } @Override public String execute() throws Exception { // TODO Auto-generated method stub return SUCCESS; }} |
EmailValidationAction-validation.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="email">< field-validator type="requiredstring"> <message>Email id is required</message></ field-validator>< field-validator type="email"> <message>Please enter valid email id.</message></ field-validator></ field></ validators> |
struts.xml
|
<? xml version="1.0" encoding="UTF-8"?><! DOCTYPE struts PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 2.0//EN" "http://struts.apache.org/dtds/struts-2.0.dtd">< struts> <constant name="struts.enable.DynamicMethodInvocation" value="false" /> <constant name="struts.devMode" value="false" /><package name="roseindia" namespace="/" extends="struts-default"> <action name="emailvalidation" class="roseindia.EmailValidationAction"> <result name="input">index.jsp</result> <result name="error">index.jsp</result> <result>successJsp.jsp</result> </action></package></ struts> |
success.jsp
|
<%@ page language="java"contentType="text/html; charset=ISO-8859-1" pageEncoding="ISO-8859-1"%> <%@taglib uri="/struts-tags" prefix="s" %>< html>< head><title>Insert title here</title></head>< body>Email-Id....< s:property value="email"/></body></ html> |
Output
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