Login Form with Session in Spring MVC

On the Eclipse, create a Spring MVC project in Spring Boot

Enter Project Information:

Name: LearnSpringMVCWithRealApps
Group: com.demo
Artifact: LearnSpringMVCWithRealApps
Description: Learn Spring MVC with Real Apps
Package: com.demo

Select the technologies and libraries to be used:

Web

Click Next button to show Site Information for project

Click Finish button to finish create Spring MVC project

<?xml version="1.0" encoding="UTF-8"?>
<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/xsd/maven-4.0.0.xsd">
	<modelVersion>4.0.0</modelVersion>

	<groupId>com.demo</groupId>
	<artifactId>LearnSpringMVCWithRealApps</artifactId>
	<version>0.0.1-SNAPSHOT</version>
	<packaging>jar</packaging>

	<name>LearnSpringMVCWithRealApps</name>
	<description>Learn Spring MVC with Real Apps</description>

	<parent>
		<groupId>org.springframework.boot</groupId>
		<artifactId>spring-boot-starter-parent</artifactId>
		<version>1.5.2.RELEASE</version>
		<relativePath /> <!-- lookup parent from repository -->
	</parent>

	<properties>
		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
		<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
		<java.version>1.8</java.version>
	</properties>

	<dependencies>

		<!-- Spring MVC  -->
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-web</artifactId>
		</dependency>

		<!-- JSTL tag lib -->
		<dependency>
			<groupId>javax.servlet.jsp.jstl</groupId>
			<artifactId>javax.servlet.jsp.jstl-api</artifactId>
			<version>1.2.1</version>
		</dependency>

		<dependency>
			<groupId>taglibs</groupId>
			<artifactId>standard</artifactId>
			<version>1.1.2</version>
		</dependency>

		<!-- Tomcat for JSP rendering -->
		<dependency>
			<groupId>org.apache.tomcat.embed</groupId>
			<artifactId>tomcat-embed-jasper</artifactId>
			<scope>provided</scope>
		</dependency>

		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-test</artifactId>
			<scope>test</scope>
		</dependency>
	</dependencies>

	<build>
		<plugins>
			<plugin>
				<groupId>org.springframework.boot</groupId>
				<artifactId>spring-boot-maven-plugin</artifactId>
			</plugin>
		</plugins>
	</build>

</project>

spring.mvc.view.prefix = /WEB-INF/views/
spring.mvc.view.suffix = .jsp
spring.mvc.static-path-pattern=/resources/**

server.port=9596

Create new package named com.demo.controllers. In this package, create new controller name AccountController as below:

package com.demo.controllers;

import javax.servlet.http.HttpSession;
import org.springframework.stereotype.Controller;
import org.springframework.ui.ModelMap;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RequestParam;

@Controller
@RequestMapping(value = "account")
public class AccountController {

	@RequestMapping(method = RequestMethod.GET)
	public String index() {
		return "account/index";
	}

	@RequestMapping(value = "login", method = RequestMethod.POST)
	public String login(
		@RequestParam("username") String username,
		@RequestParam("password") String password,
		HttpSession session,
		ModelMap modelMap) {
		if(username.equalsIgnoreCase("acc1") && password.equalsIgnoreCase("123")) {
			session.setAttribute("username", username);
			return "account/success";
		} else {
			modelMap.put("error", "Invalid Account");
			return "account/index";
		}
	}

	@RequestMapping(value = "logout", method = RequestMethod.GET)
	public String logout(HttpSession session) {
		session.removeAttribute("username");
		return "redirect:../account";
	}

}

Create new folders with path webapp\WEB-INF\views in src\main. In views folder, create new folder named account. In account folder, create JSP Pages as below:

Create new jsp file named index.jsp

<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
	pageEncoding="ISO-8859-1"%>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Login Page</title>
</head>
<body>

	<h3>Login Page</h3>
	${error }
	<form method="post"
		action="${pageContext.request.contextPath }/account/login">
		<table border="0" cellpadding="2" cellspacing="2">
			<tr>
				<td>Username</td>
				<td><input type="text" name="username"></td>
			</tr>
			<tr>
				<td>Password</td>
				<td><input type="password" name="password"></td>
			</tr>
			<tr>
				<td>&nbsp;</td>
				<td><input type="submit" value="Login"></td>
			</tr>
		</table>
	</form>

</body>
</html>

Create new jsp file named success.jsp

<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
	pageEncoding="ISO-8859-1"%>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Success Page</title>
</head>
<body>

	<h3>Success Page</h3>
	Welcome ${sessionScope.username }
	<br>
	<a href="${pageContext.request.contextPath }/account/logout">Logout</a>

</body>
</html>

Select LearnSpringMVCWithRealAppsApplication.java file in com.demo package, right click and select Run As/Spring Boot App menu

Access index method in account controller with following url: http://localhost:9596/account

Output

Test with invalid account is username: acc2 and password: 123

Output

Test with valid account is username: acc1 and password: 123.

Output

Click logout link from success page to remove session and open login page again

Output

I recommend you refer to the books below to learn more about the knowledge in this article:

Create Spring MVC Project

Configure pom.xml

Configure application.properties

Create Controller

Create View

Index View

Success View

Structure of Spring MVC Project

Run Application

References

Create Spring MVC Project

Configure pom.xml

Configure application.properties

Create Controller

Create View

Index View

Success View

Structure of Spring MVC Project

Run Application

References

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