Spring MVC

Session in Spring MVC


Create Spring MVC Project

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




Configure pom.xml

<?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>

Configure application.properties

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

server.port=9596




Entities Class

Create new package, named com.demo.entities. In this package, create entities class as below:

Product Entity

Create new java class, named Product.java

package com.demo.entities;

public class Product {

	private String id;
	private String name;
	private double price;

	public String getId() {
		return id;
	}

	public void setId(String id) {
		this.id = id;
	}

	public String getName() {
		return name;
	}

	public void setName(String name) {
		this.name = name;
	}

	public double getPrice() {
		return price;
	}

	public void setPrice(double price) {
		this.price = price;
	}

	public Product() {
	}

	public Product(String id, String name, double price) {
		this.id = id;
		this.name = name;
		this.price = price;
	}

}

Create Controller

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

package com.demo.controllers;

import java.util.ArrayList;
import java.util.List;
import javax.servlet.http.HttpSession;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import com.demo.entities.Product;

@Controller
@RequestMapping(value = "demo")
public class DemoController {

	@RequestMapping(method = RequestMethod.GET)
	public String index(HttpSession session) {

		session.setAttribute("age", 20);
		session.setAttribute("username", "acc1");

		// Assign Object
		Product product = new Product("p01", "name 1", 20);
		session.setAttribute("product", product);

		// Assign Objects List
		List<Product> products = new ArrayList<Product>();
		products.add(new Product("p01", "name 1", 20));
		products.add(new Product("p02", "name 2", 21));
		products.add(new Product("p03", "name 3", 22));
		session.setAttribute("products", products);

		return "demo/index";
	}

}




Create View

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

Index View

Create new jsp file named index.jsp

<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
	pageEncoding="ISO-8859-1"%>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"%>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Result Page</title>
</head>
<body>

	<h3>Single Values</h3>
	<table border="1" cellpadding="2" cellspacing="2">
		<tr>
			<td>Age</td>
			<td>${sessionScope.age }</td>
		</tr>
		<tr>
			<td>Username</td>
			<td>${sessionScope.username }</td>
		</tr>
	</table>

	<h3>Product Information</h3>
	<table border="1" cellpadding="2" cellspacing="2">
		<tr>
			<td>Id</td>
			<td>${sessionScope.product.id }</td>
		</tr>
		<tr>
			<td>Name</td>
			<td>${sessionScope.product.name }</td>
		</tr>
		<tr>
			<td>Price</td>
			<td>${sessionScope.product.price }</td>
		</tr>
	</table>


	<h3>Products List</h3>
	<table border="1" cellpadding="2" cellspacing="2">
		<tr>
			<th>Id</th>
			<th>Name</th>
			<th>Price</th>
		</tr>
		<c:forEach var="product" items="${sessionScope.products }">
			<tr>
				<td>${product.id }</td>
				<td>${product.name }</td>
				<td>${product.price }</td>
			</tr>
		</c:forEach>
	</table>


</body>
</html>

Structure of Spring MVC Project




Run Application

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

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

Output

References

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


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