Spring 3일차 - Container

2020.10.22(목)

 

1. Container : 여러개의 클래스를 모아서 관리 영역

========

  ApplicationContext (스프링 4)

     ==> XML을 파싱

  AnnotationConfigApplicationContext (스프링 5)

     ==> Annotation 이용

 

xml 이용 (스프링4)

src/main/java

com.sist.di

Sawon.java

package com.sist.di;

public class Sawon {
	private String name;
	private String dept;
	private String job;
	public String getName() {
		return name;
	}
	public void setName(String name) {
		this.name = name;
	}
	public String getDept() {
		return dept;
	}
	public void setDept(String dept) {
		this.dept = dept;
	}
	public String getJob() {
		return job;
	}
	public void setJob(String job) {
		this.job = job;
	}
	
}

Member.java

package com.sist.di;

public class Member {
	private String name;
	private String addr;
	private String tel;
	public String getName() {
		return name;
	}
	public void setName(String name) {
		this.name = name;
	}
	public String getAddr() {
		return addr;
	}
	public void setAddr(String addr) {
		this.addr = addr;
	}
	public String getTel() {
		return tel;
	}
	public void setTel(String tel) {
		this.tel = tel;
	}
	
}

app1.xml (beans, p)

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xmlns:p="http://www.springframework.org/schema/p"
	xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd">
	<bean id="sa" class="com.sist.di.Sawon"
		p:name="홍길동"
		p:dept="영업부"
		p:job="대리"
	/>

</beans>

app2.xml (beans, p)

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xmlns:p="http://www.springframework.org/schema/p"
	xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd">
	<bean id="mem" class="com.sist.di.Member"
		p:name="심청이"
		p:addr="서울"
		p:tel="010-1111-1111"
	/>

</beans>

MainClass.java

package com.sist.di;

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

public class MainClass {
	public static void main(String[] args) {
		String[] xml= {"app1.xml", "app2.xml"};
		ApplicationContext app=new ClassPathXmlApplicationContext(xml);
		// new ClassPathXmlApplicationContext({"app1.xml", "app2.xml"});
		Sawon sa = (Sawon)app.getBean("sa"); // Object => 반드시 형변환
		// DL => id명을 가지고 클래스를 찾아주는 기능
		System.out.println("이름:"+sa.getName());
		System.out.println("부서:"+sa.getDept());
		System.out.println("직위:"+sa.getJob());
		Member mem = app.getBean("mem",Member.class); // 데이터을 통일 (제네릭스)
		// List<String> 모든 데이터형이 object에서 string으로 변환
		System.out.println("이름:"+mem.getName());
		System.out.println("주소:"+mem.getAddr());
		System.out.println("전화:"+mem.getTel());
	}
}

 

@Configuration 애노테이션 (스프링5)

com.sist.di

Config.java

package com.sist.di;

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

@Configuration
public class Config {
	@Bean("sawon")
	public Sawon sawonInfo() {
		/*
		 * <bean id="sa" class="com.sist.di.Sawon"
				p:name="홍길동"
				p:dept="영업부"
				p:job="대리"
			/>
			 * map.put("sa", new Sawon()) => 100번지
			 * public Object getBean(String id){
			 * 	return map.get(id);
			 * }
			 * Sawon sa=getBean("sa")
			 * Sawon sa=100
		 */
		Sawon s = new Sawon(); //객체 생성
		// DI
		s.setName("이순신");
		s.setDept("개발부");
		s.setJob("과장");
		return s;
	}
}

Config2.java

package com.sist.di;

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

@Configuration
public class Config2 {
	@Bean("mem")
	public Member memberInfo() {
		Member m=new Member();
		m.setName("춘향이");
		m.setAddr("서울");
		m.setTel("010-1111-1111");
		return m;
	}
}

MainClass2.java

package com.sist.di;

import org.springframework.context.annotation.AnnotationConfigApplicationContext;

public class MainClass2 {

	public static void main(String[] args) {
		AnnotationConfigApplicationContext app = new AnnotationConfigApplicationContext(Config.class, Config2.class);
		Sawon s=(Sawon)app.getBean("sawon");
		System.out.println(s.getName());
		System.out.println(s.getDept());
		System.out.println(s.getJob());
		Member m=(Member)app.getBean("mem");
		System.out.println(m.getName());
		System.out.println(m.getAddr());
		System.out.println(m.getTel());
	}

}

 

=========================================

2. 자동주입 @Autoweired 애노테이션

src/main/java

Config.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE configuration
   PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
   "http://mybatis.org/dtd/mybatis-3-config.dtd">
<configuration>
 <typeAliases>
  <typeAlias type="com.sist.di2.EmpVO" alias="empVO"/>
 </typeAliases>
 <mappers>
  <mapper resource="com/sist/di2/emp-mapper.xml"/>
 </mappers>
</configuration>

app3.xml (beans, context, p)

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xmlns:context="http://www.springframework.org/schema/context"
	xmlns:p="http://www.springframework.org/schema/p"
	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-4.3.xsd">
	<!-- 데이터베이스 정보 생성 
		BasicDataSource
			driverClassName
			url
			username
			password
	 -->
	<bean id="ds" class="org.apache.commons.dbcp.BasicDataSource"
		p:driverClassName="oracle.jdbc.driver.OracleDriver"
		p:url="jdbc:oracle:thin:@211.238.142.000:1521:XE"
		p:username="hr"
		p:password="happy"
	/>
	<!-- 
		1. 일반 데이터 값주입
		2. 스프링에서 생성된 객체 주소 주입 p:객체명-ref="해당 클래스의 id명"
	 -->
	<!-- SqlSessionFactory (ssf) 오라클정보 getConnection-->
	<bean id="ssf" class="org.mybatis.spring.SqlSessionFactoryBean"
		p:dataSource-ref="ds"
		p:configLocation="classpath:Config.xml"
	/>
	<!-- EmpDAO로 전송 -->
	<bean id="dao" class="com.sist.di2.EmpDAO"
		p:sqlSessionFactory-ref="ssf"
	/>
</beans>

 

 

* lombok-1.18.12.jar (VO Getter/Setter자동생성)

mvnrepository.com/artifact/org.projectlombok/lombok/1.18.12

 

com.sist.di2

EmpVO.java

package com.sist.di2;
import java.util.*;

import lombok.Getter;
import lombok.Setter;
// VO => 스프링에서 관리하는 클래스가 아니다 (데이터) : 사용자 정의 데이터형
/*
 * 스프링이 관리하는 대상
 * =================
 * @Repository
 * 1. DAO
 * 
 * @Component
 * 2. Manager (웹크롤링, 트위터, openApi)
 * 
 * @Controller
 * 3. Model
 * 
 * @Service
 * 4. Service (DAO+DAO) => BI
 * 
 * @Aspect
 * 5. AOP(공통모듈)
 */
@Getter
@Setter
public class EmpVO {
	private int empno;
	private String ename;
	private String job;
	private Date regdate;
	private int sal;
}

 

emp-mapper.xml (Mybatis이용) => 환경설정위해서 Config.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.sist.di2.emp-mapper">
 <select id="empListData" resultType="EmpVO">
  SELECT empno,ename,job,hiredate as regdate,sal 
  FROM emp
 </select>
</mapper>

 

EmpDAO.java

package com.sist.di2;

import org.mybatis.spring.support.SqlSessionDaoSupport;
import java.util.*;

public class EmpDAO extends SqlSessionDaoSupport{
	public List<EmpVO> empListData(){
		return getSqlSession().selectList("empListData");
	}
}

 

MainClass.java

package com.sist.di2;

import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import java.util.*;

public class MainClass {
	public static void main(String[] args) {
		ApplicationContext app=new ClassPathXmlApplicationContext("app3.xml");
		// EmpDAO dao=new EmpDAO(); =>new를주면 setting이 안되서 오류가 남. 
		// 스프링에서 생성된 DAO를 가져와야함
		EmpDAO dao=(EmpDAO)app.getBean("dao");
		List<EmpVO> list=dao.empListData();
		for(EmpVO vo:list) {
			System.out.println(vo.getEmpno()+" "
					+vo.getEname()+" "
					+vo.getJob()+" "
					+vo.getRegdate().toString()+" "
					+vo.getSal());
		}
	}
}

 

*아래와 같이 dataSource로부터 databaseId를 찾을 수 없다고 오류가 뜨면

ERROR: org.apache.ibatis.executor.BaseExecutor - Could not get a databaseId from dataSource
org.apache.commons.dbcp.SQLNestedException: Cannot load JDBC driver class 'oracle.jdbc.driver.OracleDriver'

Project 오른쪽클릭 - Properties를 클릭한 후

Java Build Path-Libraries-Add Eternal JARs을 통해 ojdbc6.jar를 넣어주면 오류가 안뜬다!

(Referenced Libraries로 복붙해도 된다)

 

=>출력 결과

 

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