[JAVA/SPRING] 어노테이션을 이용한 스프링 설정 – 1

어노테이션을 이용한 스프링 설정 – 1

XML을 이용한 스프링 설정파일 제작을 Java파일로 제작할 수 잇는 방법

새로운 Java 파일을 만든다

• @Configuration 어노테이션을 통해, 설정 파일임을 명시한다.

package ems.member.configration;
​
import org.springframework.context.annotation.Configuration;
​
@Configuration
public class MemberConfig {
    
}

메소드를 통해 빈(Bean)을 만든다.

• @Bean 어노테이션을 통해, 빈(Bean) 객체임을 명시한다.

• 메소드의 이름은 빈(Bean)의 id와 동일하고, 반환형은 class의 이름과 동일하다.

<bean id="studentDao" class="ems.member.dao.StudentDao" ></bean>

->

@Bean
public StudentDao studentDao() {
    return new StudentDao();
}

constructor-arg는 생성자 파라미터에 넣어준다.

<bean id="registerService" class="ems.member.service.StudentRegisterService">
        <constructor-arg ref="studentDao" ></constructor-arg>
</bean>

->

@Bean
public StudentRegisterService registerService() {
    return new StudentRegisterService(studentDao());
}

property는 해당 객체를 하나 생성한 후, setter을 통해 value를 입력해준다.

<bean id="dataBaseConnectionInfoDev" class="ems.member.DataBaseConnectionInfo">
        <property name="jdbcUrl" value="jdbc:oracle:thin:@localhost:1521:xe" />
        <property name="userId" value="scott" />
        <property name="userPw" value="tiger" />
</bean>

->

@Bean
public DataBaseConnectionInfo dataBaseConnectionInfoDev() {
    DataBaseConnectionInfo infoDev = new DataBaseConnectionInfo();
    infoDev.setJdbcUrl("jdbc:oracle:thin:@localhost:1521:xe");              infoDev.setUserId("scott");
    infoDev.setUserPw("tiger");
        
    return infoDev;
}

property의 값이 여러개인 경우(List,Map), ArrayList, HashMap 등 자료구조를 이용한다.

<bean id="informationService" class="ems.member.service.EMSInformationService">
        <property name="info">
            <value>Education Management System program was developed in 2015.</value>
        </property>
        <property name="copyRight">
            <value>COPYRIGHT(C) 2015 EMS CO., LTD. ALL RIGHT RESERVED. CONTACT MASTER FOR MORE INFORMATION.</value>
        </property>
        <property name="ver">
            <value>The version is 1.0</value>
        </property>
        <property name="sYear">
            <value>2015</value>
        </property>
        <property name="sMonth">
            <value>1</value>
        </property>
        <property name="sDay">
            <value>1</value>
        </property>
        <property name="eYear" value="2015" />
        <property name="eMonth" value="2" />
        <property name="eDay" value="28" />
        <property name="developers">
            <list>
                <value>Cheney.</value>
                <value>Eloy.</value>
                <value>Jasper.</value>
                <value>Dillon.</value>
                <value>Kian.</value>
            </list>
        </property>
        <property name="administrators">
            <map>
                <entry>
                    <key>
                        <value>Cheney</value>
                    </key>
                    <value>cheney@springPjt.org</value>
                </entry>
                <entry>
                    <key>
                        <value>Jasper</value>
                    </key>
                    <value>jasper@springPjt.org</value>
                </entry>
            </map>
        </property>
        <property name="dbInfos">
            <map>
                <entry>
                    <key>
                        <value>dev</value>
                    </key>
                    <ref bean="dataBaseConnectionInfoDev"/>
                </entry>
                <entry>
                    <key>
                        <value>real</value>
                    </key>
                    <ref bean="dataBaseConnectionInfoReal"/>
                </entry>
            </map>
        </property>
    </bean>

->

@Bean
public EMSInformationService informationService() {
    EMSInformationService info = new EMSInformationService();
    info.setInfo("Education Management System program was developed in 2015.");
    info.setCopyRight("COPYRIGHT(C) 2015 EMS CO., LTD. ALL RIGHT RESERVED. CONTACT MASTER FOR MORE INFORMATION.");
    info.setVer("The version is 1.0");
    info.setsYear(2015);
    info.setsMonth(1);
    info.setsDay(1);
    info.seteYear(2015);
    info.seteMonth(2);
    info.seteDay(28);
​
    ArrayList<String> developers = new ArrayList<String>();
    developers.add("Cheney.");
    developers.add("Eloy.");
    developers.add("Jasper.");
    developers.add("Dillon.");
    developers.add("Kian.");
    info.setDevelopers(developers);
​
    Map<String, String> administrators = new HashMap<String, String>();
    administrators.put("Cheney", "cheney@springPjt.org");
    administrators.put("Jasper", "jasper@springPjt.org");
    info.setAdministrators(administrators);
​
    Map<String, DataBaseConnectionInfo> dbInfos = new HashMap<String, DataBaseConnectionInfo>();
    dbInfos.put("dev", dataBaseConnectionInfoDev());
    dbInfos.put("real", dataBaseConnectionInfoReal());
    info.setDbInfos(dbInfos);
​
    return info;
}

메인클래스에서, GenericXmlApplicationContext대신 AnnotationConfigApplicationContext를 이용한다.

AnnotationConfigApplicationContext ctx = 
                new AnnotationConfigApplicationContext(MemberConfig.class);