Spring MVC

Spring MVC Hello World Example –

• Create a “Dynamic Web Project”
• Convert to Maven Project
• Match your Project Structure
• Add dependencies in pom.xml
  • spring-webmvc
  • javax.servlet-api
• Add code for the rest of the file as shown below

pom.xml

<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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
	<modelVersion>4.0.0</modelVersion>
	<groupId>Spring-MVC-HelloWorld-Demo</groupId>
	<artifactId>Spring-MVC-HelloWorld-Demo</artifactId>
	<version>0.0.1-SNAPSHOT</version>
	<packaging>war</packaging>

	<name>Spring-MVC-HelloWorld-Demo</name>
	<url>http://maven.apache.org</url>

	<properties>
		<maven.compiler.source>1.8</maven.compiler.source>
		<maven.compiler.target>1.8</maven.compiler.target>
	</properties>

	<dependencies>
		<dependency>
			<groupId>org.springframework</groupId>
			<artifactId>spring-webmvc</artifactId>
			<version>5.0.2.RELEASE</version>
		</dependency>
		<dependency>
			<groupId>javax.servlet</groupId>
			<artifactId>javax.servlet-api</artifactId>
			<version>4.0.1</version>
		</dependency>
		<dependency>
			<groupId>junit</groupId>
			<artifactId>junit</artifactId>
			<version>3.8.1</version>
			<scope>test</scope>
		</dependency>
	</dependencies>

	<build>
		<sourceDirectory>src</sourceDirectory>
		<plugins>
			<plugin>
				<artifactId>maven-compiler-plugin</artifactId>
				<version>3.8.1</version>
				<configuration>
					<release>15</release>
				</configuration>
			</plugin>
			<plugin>
				<artifactId>maven-war-plugin</artifactId>
				<version>3.2.3</version>
				<configuration>
					<warSourceDirectory>WebContent</warSourceDirectory>
				</configuration>
			</plugin>
		</plugins>
	</build>
</project>

web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xmlns="http://xmlns.jcp.org/xml/ns/javaee"
	xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd"
	id="WebApp_ID" version="3.1">
	
	<absolute-ordering />
	<!-- Configure Dispatcher Servlet -->
	<servlet>
		<servlet-name>dispatcher</servlet-name>
		<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
		<init-param>
			<param-name>contextConfigLocation</param-name>
			<param-value>/WEB-INF/spring-mvc-demo-servlet.xml</param-value>
		</init-param>
		<load-on-startup>1</load-on-startup>
	</servlet>

	<!-- Set up URL mapping -->
	<servlet-mapping>
		<servlet-name>dispatcher</servlet-name>
		<url-pattern>/</url-pattern>
	</servlet-mapping>
	
</web-app>

spring-mvc-demo-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:context="http://www.springframework.org/schema/context"
	xmlns:mvc="http://www.springframework.org/schema/mvc"
	xmlns:util="http://www.springframework.org/schema/util"
	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-4.1.xsd
    	http://www.springframework.org/schema/mvc
        http://www.springframework.org/schema/mvc/spring-mvc.xsd
        http://www.springframework.org/schema/util
        http://www.springframework.org/schema/util/spring-util.xsd">

	<!-- Component Scanning -->
	<context:component-scan base-package="com.misstechack.springmvcdemo"></context:component-scan>
		
	<!-- Conversion, formatting, validation support -->
	<mvc:annotation-driven />
		
	<!-- Configure View Resolver -->
	<bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
		<property name="prefix" value="/WEB-INF/view/"></property>
		<property name="suffix" value=".jsp"></property>
	</bean>
	
</beans>

Model Class – User.java

package com.misstechack.springmvcdemo.model;

public class User {
	public String userName;
	public String getUserName() {
		return userName;
	}
	public void setUserName(String userName) {
		this.userName = userName;
	}
}

Controller Class – HomeController.java

package com.misstechack.springmvcdemo.controller;

import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.validation.annotation.Validated;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;

import com.misstechack.springmvcdemo.model.User;

@Controller
public class HomeController {
	
	@RequestMapping(value="/", method=RequestMethod.GET)
	public String home(Model model) {
		return "home";
	}
	@RequestMapping(value="/user", method=RequestMethod.POST)
	public String user(@Validated User user, Model model) {
		model.addAttribute("userName", user.getUserName());
		return "user";
	}
}

View – home.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8" %>
<html>
	<head>
		<title>Home</title>
	</head>
	<body>
		<h1>Hello World!</h1>
		<hr>
		<form action="user" method="post">
			User Name:  
			<input type="text" name="userName" placeholder="Enter name">
			<br><br>
			<input type="submit" value="Submit">
		</form>
	</body>
</html>

View – user.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01Transitional//EN" "https://www.w3.org/TR/html4/loose.dtd">
<html>
	<head>
		<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
		<title>User Home Page</title>
	</head>
	<body>
		<h3>Hey!! I am ${userName}</h3>
	</body>
</html>

Steps to execute MVC Application:

• In Eclipse, stop Tomcat
• Right-click your project and select Export > WAR File
• In the Destination field, enter: /Spring-MVC-HelloWorld-Demo.war
• Outside of Eclipse, start Tomcat
• If you are using MS Windows, then you should find it on the Start menu
• Make sure Tomcat is up and running by visiting: http://localhost:8080
• Deploy your new WAR file by copying it to \webapps
• Visit your new app. If your war file was: Spring-MVC-HelloWorld-Demo.war then you can access it with http://localhost:8080/Spring-MVC-HelloWorld-Demo/