Spring) bean's Life Cycle (bean의 생명주기)

예제코드 1 (기본)

<?xml version="1.0" encoding="UTF-8"?>

<beans xmlns="http://www.springframework.org/schema/beans"

     xmlns:context="http://www.springframework.org/schema/context"

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.xsd

http://www.springframework.org/schema/context

http://www.springframework.org/schema/context/spring-context.xsd">

    

    <!--

            Client client = new Client("192.168.0.115");

            client.setHost("192.168.1.1");

    -->

    <bean id="client" class="spring.Client">

        <constructor-arg value="192.168.0.115" />

        <property name="host" value="192.168.1.1" />

    </bean>

</beans>

public class Client implements InitializingBean , DisposableBean {

    public Client() {

        System.out.println("Client Default");

    }

    

    private String defaulthost;

    public Client(String defaulthost){

        this.defaulthost = defaulthost;

        System.out.println("Client Overloading :" + this.defaulthost);

    }

    

    private String host;

    public String getHost() {

        return host;

    }

    public void setHost(String host) {

        this.host = host;

        System.out.println("Client setHost() 호출 : " + this.host);

    }

    public void send(){

        System.out.println("데이터 보내기....");

    }

     

    //초기화

    @Override

    public void afterPropertiesSet() throws Exception {

        System.out.println("Client 초기화 함수 호출");     

    }

    //소멸

    @Override

    public void destroy() throws Exception {

        System.out.println("Client 소멸자 함수 호출");

        

    }

}

public class Program {

    public static void main(String[] args) {

        

        //Client client = new Client("192.168.0.115");

        //client.setHost("192.168.1.1");

        

        

        GenericXmlApplicationContext context =

                new GenericXmlApplicationContext("classpath:ApplicationContext.xml");

        Client client = context.getBean("client", Client.class);

        client.send();

        context.close(); //컨테이너 종료

        

    }

}

콘솔결과

Client Overloading :192.168.0.115

Client setHost() 호출 : 192.168.1.1

Client 초기화 함수 호출

데이터 보내기....

Client 소멸자 함수 호출

예제코드 2 (사용자 정의 코드)

<?xml version="1.0" encoding="UTF-8"?>

<beans xmlns="http://www.springframework.org/schema/beans"

     xmlns:context="http://www.springframework.org/schema/context"

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.xsd

http://www.springframework.org/schema/context

http://www.springframework.org/schema/context/spring-context.xsd">

    

    <!--

            Client2 client = new Client2("192.168.0.115");

            client.setHost("192.168.1.1");

            

            사용자가 임의 만들 함수

            Client2_init() : 객체 초기화

            Client2_close() : 객체 소멸자

    -->

    <bean id="client2" class="spring.Client2"

     init-method="Client2_init" destroy-method="Client2_close" >

        <constructor-arg value="192.168.0.115" />

        <property name="host" value="192.168.1.1" />

    </bean>

</beans>

public class Client2 {

    public Client2() {

        System.out.println("Client2 Default");

    }

    

    private String defaulthost;

    public Client2(String defaulthost){

        this.defaulthost = defaulthost;

        System.out.println("Client2 Overloading :" + this.defaulthost);

    }

    

    private String host;

    public String getHost() {

        return host;

    }

    public void setHost(String host) {

        this.host = host;

        System.out.println("Client2 setHost() 호출 : " + this.host);

    }

    public void send(){

        System.out.println("데이터 보내기....");

    }

    

    //개발자가 임의로 만든 함수 > 객체의 초기화

    public void Client2_init(){

        System.out.println("사용자 정의 초기화 함수 호출");

    }

    //개발자가 임의로 만든 함수 > 객체의 소멸자

    public void Client2_close(){

        System.out.println("사용자 정의 소멸자 함수 호출");

    }

}

public class Program2 {

    public static void main(String[] args) {

        

    

        GenericXmlApplicationContext context =

                new GenericXmlApplicationContext("classpath:ApplicationContext2.xml");

        Client2 client = context.getBean("client2", Client2.class);

        client.send();

        context.close();        

    }

}

콘솔결과

Client2 Overloading :192.168.0.115

Client2 setHost() 호출 : 192.168.1.1

사용자 정의 초기화 함수 호출

데이터 보내기....

사용자 정의 소멸자 함수 호출