Spring Framework

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Simple Spring Code

package com.okdevtv.okspring;

public class HelloWorld {
  private String message;

  public void setMessage(String message) {
  this.message = message;
  }

  public String getMessage() {
  return this.message;
  }
}
package com.okdevtv.okspring;

import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

public class MainApp {
  public static void main(String[] args) {
    ApplicationContext context = new ClassPathXmlApplicationContext("Beans.xml");
    HelloWorld obj = (HelloWorld) context.getBean("helloWorld");
    String message = obj.getMessage();
    System.out.println("Your Message : " + message);
  }
}
<?xml version = "1.0" encoding = "UTF-8"?>

<beans xmlns="http://www.springframework.org/schema/beans"
  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  xsi:schemaLocation="http://www.springframework.org/schema/beans
   http://www.springframework.org/schema/beans/spring-beans-3.0.xsd">

  <bean id="helloWorld" class="com.okdevtv.okspring.HelloWorld">
    <property name="message" value="# Hello World!" />
  </bean>

</beans>
<?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/maven-v4_0_0.xsd">
	<modelVersion>4.0.0</modelVersion>
	<groupId>com.okdevtv</groupId>
	<artifactId>okspring</artifactId>
	<name>okspring</name>
	<version>1.0.0-BUILD-SNAPSHOT</version>
	<properties>
		<java-version>1.8</java-version>
		<org.springframework-version>3.1.1.RELEASE</org.springframework-version>
		<failOnMissingWebXml>false</failOnMissingWebXml>
	</properties>
	<dependencies>
		<!-- Spring -->
		<dependency>
			<groupId>org.springframework</groupId>
			<artifactId>spring-context</artifactId>
			<version>${org.springframework-version}</version>
		</dependency>
	</dependencies>
</project>

Bean scope

example

<bean id="..." class="..." scope="singleton">
</bean>

Bean lifecycle

public class ExampleBean implements InitializingBean {
  public void afterPropertiesSet() {
    // do some initialization work
  }
}
public class ExampleBean implements DisposableBean {
  public void destroy() {
    System.out.println("destroy");
  }
}

related

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