JAVA EE: Spring Bean Java Config Example | Spring JavaConfig example

Friday, 26 October 2018

Spring Bean Java Config Example | Spring JavaConfig example | Spring Tutorial

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Spring Bean Java Config Example | Spring JavaConfig example | Spring Tutorial

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%20http://maven.apache.org/maven-v4_0_0.xsd">

    <modelVersion>4.0.0</modelVersion>

    <groupId>com.ram.core</groupId>

    <artifactId>SpringHelloWorld</artifactId>

    <packaging>jar</packaging>

    <version>1.0-SNAPSHOT</version>

    <name>SpringHelloWorld</name>

    <url>http://maven.apache.org</url>

    <properties>

        <spring.version>5.0.2.RELEASE</spring.version>

    </properties>

    <dependencies>

        <dependency>

            <groupId>junit</groupId>

            <artifactId>junit</artifactId>

            <version>3.8.1</version>

            <scope>test</scope>

        </dependency>

        <!-- Spring 5 dependencies -->

        <dependency>

            <groupId>org.springframework</groupId>

            <artifactId>spring-core</artifactId>

            <version>${spring.version}</version>

        </dependency>

        <dependency>

            <groupId>org.springframework</groupId>

            <artifactId>spring-context</artifactId>

            <version>${spring.version}</version>

        </dependency>

    </dependencies>

</project>

HelloWorld.java

package com.ram.hello;

public interface HelloWorld

{

    public void printHelloWorld(String msg);

}

HelloWorldImpl.java

package com.ram.hello.impl;

import com.ram.hello.HelloWorld;

public class HelloWorldImpl implements HelloWorld

{

    public void printHelloWorld(String msg)

    {

        System.out.println("Hello : " + msg);

    }

}

AppConfig.java

package com.ram.config;

import org.springframework.context.annotation.Bean;

import org.springframework.context.annotation.Configuration;

import com.ram.hello.HelloWorld;

import com.ram.hello.impl.HelloWorldImpl;

/**

 * Annotate with @Configuration to tell Spring that this is the core

 * Spring configuration file, and define bean via @Bean.

 */

@Configuration

public class AppConfig

{

    @Bean(name = "helloBean")

    public HelloWorld helloWorld()

    {

        return new HelloWorldImpl();

    }

}

App.java

package com.ram.core;

import org.springframework.context.ApplicationContext;

import org.springframework.context.annotation.AnnotationConfigApplicationContext;

import com.ram.config.AppConfig;

import com.ram.hello.HelloWorld;

public class App

{

    public static void main(String[] args)

    {

        /*

         * Load the JavaConfig class with

         * AnnotationConfigApplicationContext.

         */

        ApplicationContext context = new AnnotationConfigApplicationContext(

                AppConfig.class);

        HelloWorld helloWorldImplObj = (HelloWorld) context.getBean("helloBean");

        helloWorldImplObj.printHelloWorld("Spring5 Hello world");

    }

}

Output

Sep 29, 2018 10:13:18 AM org.springframework.context.support.AbstractApplicationContext prepareRefresh

INFO: Refreshing org.springframework.context.annotation.AnnotationConfigApplicationContext@5f4da5c3: startup date [Sat Sep 29 10:13:18 IST 2018]; root of context hierarchy

Hello : Spring5 Hello world