Struts 2 Validation Example
Struts 2 Validation Example explains about step by step example of Struts2 Validation With Eclipse
Apache Struts 2, is a popular Java Model-View-Contraller (MVC) framework, which is developed by merging WebWork and Struts 1.x web frameworks.
Struts 2 have lot off difference with struts 1, struts 2 have implemented with an idea of convention over configuration, it also have many annotations in order to increase the developer productivity.
Struts 2 provides in built validation features. You can see how to validate the fields in struts 2, on below example
Required Libraries
Following jar must be in classpath
- commons-fileupload-1.3.jar
- commons-io-2.0.1.jar
- commons-lang3-3.1.jar
- commons-logging-1.1.3.jar
- freemarker-2.3.19.jar
- javassist-3.11.0.GA.jar
- ognl-3.0.6.jar
- struts2-core-2.3.15.1.jar
- xwork-core-2.3.15.1.jar
You can see the project structure below
Register.jsp
<%@taglib uri="/struts-tags" prefix="s"%> <html> <head> <s:head /> </head> <body> <s:form action="register" method="post"> <s:textfield name="username" label="User Name" /> <s:textfield name="age" label="Age" /> <s:password name="password" label="Password" /> <s:submit value="register" /> </s:form> </body> </html>
RegisterSuccess.jsp
<%@page contentType="text/html" pageEncoding="UTF-8"%> <%@taglib uri="/struts-tags" prefix="s" %> <html> <body> <h1>Register Success</h1> </body> </html>
RegisterAction.java
Here is the action class, We are using Struts in built custom validate() method and throwing addFieldError()
import com.opensymphony.xwork2.ActionSupport;
public class RegisterAction extends ActionSupport {
private static final long serialVersionUID = 1L;
private String username;
private Integer age;
private String password;
public String execute() {
return "success";
}
public String getUsername() {
return username;
}
public void setUsername(String username) {
this.username = username;
}
public Integer getAge() {
return age;
}
public void setAge(Integer age) {
this.age = age;
}
public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password;
}
public void validate() {
if (getUsername().length() == 0) {
addFieldError("username", "User Name is required");
} else if (!getUsername().equals("Rockey")) {
addFieldError("username", "Invalid User");
}
if (getPassword().length() == 0) {
addFieldError("password", "Invalid password");
}
if (getAge() == null) {
addFieldError("age", "Age required");
}
}
}
struts.xml
Following is the struts 2 configuration, which will used for naviagating different page views
The name of this configuration file should be "struts.xml"
<!DOCTYPE struts PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 2.0//EN" "http://struts.apache.org/dtds/struts-2.0.dtd"> <struts> <package name="default" extends="struts-default"> <action name="register" class="net.javatips.RegisterAction"> <result name="success">RegisterSuccess.jsp</result> <result name="input">Register.jsp</result> </action> </package> </struts>
web.xml
<?xml version="1.0" encoding="UTF-8"?> <web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" version="2.5"> <filter> <filter-name>struts2</filter-name> <filter-class>org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter</filter-class> </filter> <filter-mapping> <filter-name>struts2</filter-name> <url-pattern>/*</url-pattern> </filter-mapping> <session-config> <session-timeout>30</session-timeout> </session-config> <welcome-file-list> <welcome-file>index.jsp</welcome-file> </welcome-file-list> </web-app>
Run
You need to invoke http://localhost:8080/Struts2Validation/Register.jsp
