Spring Course – Hello World Spring Maven Web Project using Java configuration

Day #4 – Hello World Spring Maven Web Project using Java configuration

img1

#1 Add properties and dependencies in 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 http://maven.apache.org/maven-v4_0_0.xsd">
	<modelVersion>4.0.0</modelVersion>
	<groupId>com.janani</groupId>
	<artifactId>bookapp-spring</artifactId>
	<packaging>war</packaging>
	<version>0.0.1-SNAPSHOT</version>
	<name>bookapp-spring Maven Webapp</name>
	<url>http://maven.apache.org</url>
	<properties>
		<maven.compiler.source>1.8</maven.compiler.source>
		<maven.compiler.target>1.8</maven.compiler.target>
		<failOnMissingWebXml>false</failOnMissingWebXml>
	</properties>
	<dependencies>
		<dependency>
			<groupId>junit</groupId>
			<artifactId>junit</artifactId>
			<version>3.8.1</version>
			<scope>test</scope>
		</dependency>
		<dependency>
			<groupId>org.springframework</groupId>
			<artifactId>spring-webmvc</artifactId>
			<version>4.3.11.RELEASE</version>
		</dependency>
		<dependency>
			<groupId>javax.servlet</groupId>
			<artifactId>javax.servlet-api</artifactId>
			<version>4.0.0</version>
			<scope>provided</scope>
		</dependency>
		<dependency>
			<groupId>javax.servlet</groupId>
			<artifactId>jstl</artifactId>
			<version>1.2</version>
		</dependency>
		<dependency>
			<groupId>mysql</groupId>
			<artifactId>mysql-connector-java</artifactId>
			<version>6.0.6</version>
		</dependency>
	</dependencies>
	<build>
		<finalName>bookapp-spring</finalName>
	</build>
</project>

#2 Create Java Configuration file SpringConfig.java and WebConfig.java under src=>main

  • Right click main=>New=>Folder=>java=>Finish
  • Right click java=>New=>Class
    • In package=>type com.janani.config and In Class=>SpringConfig=>Finish
    • In package=>type com.janani.config and In Class=>WebConfig=>Finish
package com.janani.config;

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.servlet.ViewResolver;
import org.springframework.web.servlet.config.annotation.DefaultServletHandlerConfigurer;
import org.springframework.web.servlet.config.annotation.EnableWebMvc;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurerAdapter;
import org.springframework.web.servlet.view.InternalResourceViewResolver;
import org.springframework.web.servlet.view.JstlView;

@Configuration
@EnableWebMvc
@ComponentScan(basePackages = "com.janani")
public class SpringConfig extends WebMvcConfigurerAdapter {

	@Bean
	public ViewResolver viewResolver() {

		InternalResourceViewResolver viewResolver = new InternalResourceViewResolver();
		viewResolver.setViewClass(JstlView.class);
		viewResolver.setPrefix("/");
		viewResolver.setSuffix(".jsp");
		return viewResolver;
	}

	@Override
	public void configureDefaultServletHandling(DefaultServletHandlerConfigurer configurer) {
		configurer.enable();
	}
}

 

package com.janani.config;

import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import javax.servlet.ServletRegistration;
import org.springframework.web.WebApplicationInitializer;
import org.springframework.web.context.support.AnnotationConfigWebApplicationContext;
import org.springframework.web.servlet.DispatcherServlet;

public class WebConfig implements WebApplicationInitializer {
	public void onStartup(ServletContext ctx) throws ServletException {
		AnnotationConfigWebApplicationContext webCtx = new AnnotationConfigWebApplicationContext();
		webCtx.register(SpringConfig.class);
		webCtx.setServletContext(ctx);
		ServletRegistration.Dynamic servlet = ctx.addServlet("dispatcher", new DispatcherServlet(webCtx));
		servlet.setLoadOnStartup(1);
		servlet.addMapping("/");
	}
}

#3 Create a Controller

  • In bookapp-spring=>src=>main=>java=>com=>janani=>controller, create a class HomeController
package com.janani.controller;

import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;

@Controller
@RequestMapping("/home")
public class HomeController {
	@GetMapping
	public String home() {
		return "index";
	}
}

#3 Run the Project 

Hint:In menu bar=>Project=>Clean=>Clean all projects

  • Right click the project bookapp-spring=>Run As=>Run on Server=>Finish
  • Displays default jsp i.e. index.jsp

img3.png

  • Access http://localhost:8080/bookapp-spring/home, it also points to index.jsp(as specified in HomeController)

img2

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