Java Interview Answers: Top Most Struts 2.x Validation Example

Tuesday 6 August 2013

Top Most Struts 2.x Validation Example

Here we will see how to write and implement the Struts 2.x Validation.

Create a Web Application project in Eclipse

1) Write login.jsp, login_success.jsp and login_failed.jsp under WebContent folder
2) Design the web.xml to point the the login.jsp
3) Develop the LoginAction.java , UserModel.java under src folder
4) Write the required validation properties in LoginAction.properties under src folder
5) struts.xml will the action mapping under src folder

The code for each file :

login.jsp

<%@ taglib uri="/struts-tags" prefix="struts2"%>
<html>
<body>
<h2> Welcome to STruts2 validation demo</h2>
<struts2:form action="login">
<struts2:textfield name="userName" label="LoginName"/>
<struts2:password name="password" label="Password"/>
<struts2:submit value="Login"/>
</struts2:form>
</body>

</html>

login_success.jsp

<html>
<body>
<h2> user is successfully logged in</h2>
</body>
</html>

login_failed.jsp

<html>
<body>
<h2> UserName/password is invalid</h2>
</body>
</html>

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"
id="WebApp_ID" version="2.5">
<display-name>Struts2Example2</display-name>

<filter>
<filter-name>Struts2Controller</filter-name>
<filter-class>org.apache.struts2.dispatcher.FilterDispatcher</filter-class>
</filter>

<filter-mapping>
<filter-name>Struts2Controller</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>

<welcome-file-list>
<welcome-file>login.jsp</welcome-file>
</welcome-file-list>
</web-app>

LoginAction.java

import com.opensymphony.xwork2.ActionSupport;
public class LoginAction extends ActionSupport{

private String userName;
private String password;

public String getUserName() {
return userName;
}
public void setUserName(String userName) {
this.userName = userName;
}
public String getPassword() {
return password;
}

public void setPassword(String password) {
this.password = password;
}

public void validate() {
System.out.println("valdate method");
System.out.println("userName == "+userName);
System.out.println("password == "+password);

if(userName == null || userName.length() == 0){
System.out.println("user name is empty");
addFieldError("userName", getText("myapp.struts2.userName.required"));
}

if(password == null || password.length() == 0){
System.out.println("password is empty");
addFieldError("password", "Password is mandatory");
}
}

public String execute() throws Exception {
System.out.println("execute method");
boolean result = UserModel.isUserNameAndPasswordExist(userName, password);
if(result){
return "success";
}else{
return "failure";
}

}
}

UserModel.java

import java.sql.Connection;

import java.sql.DriverManager;

import java.sql.PreparedStatement;

import java.sql.ResultSet;

import java.sql.SQLException;

import java.util.ArrayList;

public class UserModel {

private static Connection con;

static {

try{

Class.forName("oracle.jdbc.driver.OracleDriver");

con = DriverManager.getConnection(

"jdbc:oracle:thin:@localhost:1521:XE", "user", "passwd");

}catch(Exception e){

e.printStackTrace();

}

public static boolean isUserNameAndPasswordExist (

String userName,String password){

boolean result = false;

try{

String sql = "select * from user where password = ? and login_name = ?";

PreparedStatement ps = con.prepareStatement(sql);

ps.setString(2, userName);

ps.setString(1, password);

ResultSet rs = ps.executeQuery();

if(rs.next() && rs.getInt(1)> 0){

result = true;

}

}catch(SQLException e){

e.printStackTrace();

}

return result;

}

LoginAction.properties

myapp.struts2.userName.required=UserName is required

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">

<result name="success">/login_success.jsp</result>

<result name="failure">/login_failed.jsp</result>

<result name="input">/login.jsp</result>

</action>

</package>

</struts>

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Tuesday 6 August 2013

Top Most Struts 2.x Validation Example

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