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spring 2 min read 4.2 KB Raw Markdown
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Spring Framework

시작하기

  • 자바의 대표적인 프레임워크
  • Spring Framework를 중심으로 다양한 프로젝트 제품군
  • EJB(Enterprise Java Beans)의 무거운 구조 대체
  • 매년 업그레이드되면서 Java의 새로운 기능 적용
  • 최초 빌드 도구 Maven 활용, 4.0부터 빌드도구 Gradle 사용
  • 스프링 프로젝트 개발 구조는 Maven 스타일

필요조건

기본 개념

  • IoC/DI Inversion of Control/Dependency Injection
  • AOP Aspect Oriented Programming
  • PSA Portable Service Abstraction

스프링 아키텍처

Simple Spring Code

  • use : MainApp.java

  • bean : HelloWorld.java

  • config : Beans.xml

  • HelloWorld.java

java
package com.okdevtv.okspring;

public class HelloWorld {
  private String message;

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

  public String getMessage() {
  return this.message;
  }
}
  • MainApp.java
java
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);
  }
}
  • Beans.xml
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"
  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>
  • pom.xml
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/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

  • singleton
  • prototype
  • request
  • session
  • global-session

example

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

Bean lifecycle

  • Initialization callbacks
    • init-method=“init”
    • InitializingBean interface
java
public class ExampleBean implements InitializingBean {
  public void afterPropertiesSet() {
    // do some initialization work
  }
}
  • Destruction callbacks
    • destroy-method=“destroy”
    • DisposableBean interface
java
public class ExampleBean implements DisposableBean {
  public void destroy() {
    System.out.println("destroy");
  }
}

related

  • ioc: IoC Container
  • bean: Bean
  • boot: 스프링 부트
  • boot2: 스프링 부트2
  • utils: 스프링 Utils
  • spel: 스프링 표현식

참고