Spring 3.2 MVC Form Handling

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Spring 3.2 MVC Form Handling

In this example, you will learn about handling forms in Spring 3.2 MVC.

In the given below example, a login page is given in which you need to enter following correct information :

User Name (Admin)
Password (root)

The project structure is given below :

Given below the application flow followed by the code used in the application :

When you execute the application, the first page which will appear to you is :

If fill incorrect information, it will redirect you on a error page :

If login is correct, it will show you the following code :

Codes :

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>Spring3.2Form Handling</display-name>
<welcome-file-list>
<welcome-file>index.jsp</welcome-file>
</welcome-file-list>

<servlet>
<servlet-name>dispatcher</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<load-on-startup>1</load-on-startup>
</servlet>

<servlet-mapping>
<servlet-name>dispatcher</servlet-name>
<url-pattern>*.html</url-pattern>
</servlet-mapping>

</web-app>

dispatcher-servlet.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:p="http://www.springframework.org/schema/p"
xmlns:context="http://www.springframework.org/schema/context"
xsi:schemaLocation="
http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context.xsd">

<context:component-scan base-package="net.roseindia.controller" />

<bean id="viewResolver"
class="org.springframework.web.servlet.view.UrlBasedViewResolver">
<property name="viewClass"
value="org.springframework.web.servlet.view.JstlView" />
<property name="prefix" value="/WEB-INF/jsp/" />
<property name="suffix" value=".jsp" />
</bean>

<bean id="messageSource"
class="org.springframework.context.support.ReloadableResourceBundleMessageSource">
<property name="basename" value="/WEB-INF/messages" />
</bean>

</beans>

index.jsp

<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
pageEncoding="ISO-8859-1"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Insert title here</title>
</head>
<body>
<jsp:forward page="loginForm.html"></jsp:forward>
</body>
</html>

FormController.java

package net.roseindia.controller;

import java.util.Map;

import net.roseindia.model.LoginForm;

import org.springframework.stereotype.Controller;
import org.springframework.validation.BindingResult;
import org.springframework.web.bind.annotation.RequestMapping;

@Controller
public class FormController {
@RequestMapping("/loginForm.html")
public String showForm(Map<String, LoginForm> model) {
LoginForm loginForm = new LoginForm();
model.put("loginForm", loginForm);
return "loginform";
}

@RequestMapping("/login.html")
public String processForm(LoginForm loginForm, BindingResult result,
Map<String, LoginForm> model) {
String userName = "Admin";
String password = "root";
if (result.hasErrors()) {
return "loginform";
}
loginForm = (LoginForm) model.get("loginForm");

if (!loginForm.getUserName().equals(userName)
|| !loginForm.getPassword().equals(password)) {
return "loginerror";
}

model.put("loginForm", loginForm);
return "loginsuccess";
}

}

LoginForm.java

package net.roseindia.model;

import javax.validation.constraints.Size;
import org.hibernate.validator.constraints.NotEmpty;

public class LoginForm {
@NotEmpty
@Size(min = 1, max = 50)
private String userName;

@NotEmpty
@Size(min = 1, max = 20)
private String password;

public void setUserName(String userName) {
this.userName = userName;
}

public String getUserName() {
return userName;
}

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

public String getPassword() {
return password;
}

}

loginform.jsp

<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
pageEncoding="ISO-8859-1"%>
<%@ taglib prefix="form" uri="http://www.springframework.org/tags/form"%>

<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" 
"http://www.w3.org/TR/html4/loose.dtd">

<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Spring3Example</title>
</head>
<body>
<h3>Login Form</h3>
<font color="blue">
<h5>User Name="Admin" and Password="root"</h5>
</font>
<form:form action="login.html" commandName="loginForm">
<table>
<tr>
<td>User Name:<FONT color="red"><form:errors
path="userName" /></FONT></td>
</tr>

<tr>
<td><form:input path="userName" /></td>
</tr>

<tr>
<td>Password:<FONT color="red"><form:errors
path="password" /></FONT></td>
</tr>

<tr>
<td><form:password path="password" /></td>
</tr>

<tr>
<td><input type="submit" value="Submit" /></td>
</tr>

</table>
</form:form>
</body>
</html>

loginsuccess.jsp

<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
pageEncoding="ISO-8859-1"%>
<%@ taglib prefix="core" uri="http://java.sun.com/jsp/jstl/core"%>

<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Spring 3.2 Form Handling Example</title>
</head>
<body>
<h3>Welcome <core:out value="${loginForm.userName}" /></h3>
<table>
<tr>
<td><a href="loginForm.html">Back</a></td>
</tr>
</table>
</body>

</html>

loginerror.jsp

<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
pageEncoding="ISO-8859-1"%>

<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">

<html>

<head>

<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">

<title>Spring3Example</title>

</head>

<body>

<h3>Login Error !!! Click below to login again</h3>

<table>

<tr>

<td><a href="loginForm.html">Retry</a></td>

</tr>

</table>

</body>

</html>

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Spring 3.2 MVC Form Handling