Struts 2 form validation using annotation
To Validate form field in struts 2 application you could directly annotate form field. In this demo you will see how to validate form fields.
Steps:
- Create maven project name: Struts2FormValidation. Below is final structure of project:
- FormValidationAction.java
package com.javahonk.action; import org.apache.struts2.convention.annotation.Action; import org.apache.struts2.convention.annotation.Result; import org.apache.struts2.convention.annotation.Results; import com.opensymphony.xwork2.ActionSupport; import com.opensymphony.xwork2.validator.annotations.EmailValidator; import com.opensymphony.xwork2.validator.annotations.RequiredStringValidator; @Results({ @Result(name = "error", location = "/index.jsp"), @Result(name = "input", location = "/index.jsp")}) public class FormValidationAction extends ActionSupport { private static final long serialVersionUID = 1L; private String firstName; private String lastName; private String email; @Override @Action(value = "/formValidationAction") public String execute() throws Exception { return ActionSupport.INPUT; } public String getFirstName() { return firstName; } @RequiredStringValidator(message = "First name is required.") public void setFirstName(String firstName) { this.firstName = firstName; } public String getLastName() { return lastName; } @RequiredStringValidator(message = "Last name is required.") public void setLastName(String lastName) { this.lastName = lastName; } public String getEmail() { return email; } @RequiredStringValidator(message = "Email id is required.") @EmailValidator(message = "Please enter valid email.") public void setEmail(String email) { this.email = email; } }
- index.jsp:
<%@ page language="java" contentType="text/html; charset=ISO-8859-1" pageEncoding="ISO-8859-1"%> <%@ taglib prefix="s" uri="/struts-tags" %> <?xml version="1.0" encoding="UTF-8" ?> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html> <head> <title>Struts 2 form validation using annotation</title> <s:head/> </head> <body> <h1 style="color: green"><s:text name="Struts 2 form validation using annotation" /></h1> <s:if test="hasActionErrors()"> <div id="fieldErrors"> <s:actionerror/> </div> </s:if> <s:form action="formValidationAction" namespace="/" method="post" name="strutsForm"> <s:textfield name="firstName" size="30" maxlength="50" key="First Name"/> <s:textfield name="lastName" size="30" maxlength="50" key="Last Name"/> <s:textfield name="email" size="30" maxlength="50" key="Email Id"/> <s:submit type="button" key="submit" label="Submit" align="right"/> </s:form> </body> </html>
- pom.xml:
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd"> <modelVersion>4.0.0</modelVersion> <groupId>com.javahonk</groupId> <artifactId>Struts2FormValidation</artifactId> <packaging>war</packaging> <version>0.0.1-SNAPSHOT</version> <name>Struts2FormValidation Maven Webapp</name> <url>http://maven.apache.org</url> <dependencies> <dependency> <groupId>org.apache.struts</groupId> <artifactId>struts2-core</artifactId> <version>2.3.16.3</version> </dependency> <dependency> <groupId>org.apache.struts</groupId> <artifactId>struts2-convention-plugin</artifactId> <version>2.3.16.3</version> </dependency> </dependencies> <build> <finalName>Struts2FormValidation</finalName> </build> </project>
- Hopefully you already setup tomcat server with eclipse if not please use this tutorial. To run: Right click on project –> Run As –> Run on Server. You will see below page:
- Click Submit button without entering any data. You will see below validation message on the page:
For more information please read struts 2 tutorial here.
Download Project: Struts2FormValidation
