spring2

bean 경로

<!-- root 로거 기본 설정 -->
<root level="debug"><!-- 로그 기록 레벨 : trace-debug-info- warn-error -->
<appender-ref ref="STDOUT" />
<appender-ref ref="DAILYOUT" />
</root>

error로 설정시 깔끔하게 나옴

 

ApplicationContext ctx = new GenericXmlApplicationContext("file:\\c:\\upload\\person.xml");

 

ApplicationContext ctx = new
				GenericXmlApplicationContext("classpath:stu.xml");
		Student s1 = ctx.getBean("xxx", Student.class);
		System.out.println(s1);
		Student s2 = (Student)ctx.getBean("xxx");
		s2.setAge(20);
		s2.setName("이순신");
		System.out.println(s2.toString());

Student [name=홍길동, age=10]

Student [name=이순신, age=20]

 

ApplicationContext ctx = new
				GenericXmlApplicationContext("com/kkk/*.xml");
		Person p1 = ctx.getBean("xxx", Person.class);
		System.out.println(p1);
		System.out.println(p1.getInfo());
		System.out.println("==============");
		ApplicationContext ctx1 = new
				GenericXmlApplicationContext("com/kkk/animal.xml");
		Animal a =
				(Animal)ctx1.getBean("yyy");
		System.out.println(a);
		System.out.println(a.getName());

→ console

2.xml에서 빈 생성 , 생성 빈 사용 방법=========

Animal 생성자 호출됨 기본생서아 호출

com.spring.Person@57db2b13 이순신

Animal 생성자 호출됨 기본생서아 호출

com.spring.Animal@2254127a 고양이

 

com/kkk/*.xml→ animal.xml에서 xxx yyy 둘다 받음

<bean class="com.spring.Animal" id="yyy"></bean>

<bean class="com.spring.Person" id="xxx"></bean>

 

import /bean 경로

<!-- 다른 configuration.xml 파일을 import 해서 사용 -->
<import resource ="animal.xml"/>

결과 동일 하게 나옴

System.out.println("2.xml에서 빈 생성 , 생성 빈 사용 방법=========");
		ApplicationContext ctx = new
				GenericXmlApplicationContext("classpath:com/kkk/person.xml");
		Person p1 = ctx.getBean("xxx", Person.class);
		System.out.println(p1);
		System.out.println(p1.getInfo());
		System.out.println("==============");
		Animal a =
				(Animal)ctx.getBean("yyy");
		System.out.println(a);
		System.out.println(a.getName());

 

xml 을 ,로 동시에 불러오다 ↓

ApplicationContext ctx = new
				GenericXmlApplicationContext("classpath:com/kkk/animal.xml","classpath:com/kkk/person.xml");

multi

Servlet dao 패턴 이용 db

Servlet ⇒ service ⇒ dao → db class Service {

dao dao;

public Service(){

Public Service (Dao dao){ //생성자

this.dao =dao;

}

public void select(){

dao.select();

}

}

///////////////////////

Dao dao = new Dao; //빈생성

Service service = new Service(dao);// 주입

//constructor injection

Servlet 은 Service.select();

bean =⇒

<bean class="com.spring.Person" id ="aaa"></bean>
<!--  기본생성자 사용 필수  -->
<bean class="com.spring.Person" id ="kkk">
<constructor-arg name="x" value ="롱길동"></constructor-arg>

 

System.out.println("2.xml에서 빈 생성 , 생성 빈 사용 방법=========");
		ApplicationContext ctx = new
				GenericXmlApplicationContext("classpath:com/spring/person.xml");
		Person p1 = ctx.getBean("kkk", Person.class);
		System.out.println(p1);
		System.out.println(p1.getInfo());
		
		System.out.println("==============");
		Person p2 = ctx.getBean("aaa", Person.class);
		System.out.println(p2);
		System.out.println(p2.getInfo());

 

 

person.java

ublic class Person {
	
		String name;

	public Person() {
		super();
		System.out.println("person 기본생성자");
	}
	public Person(String x) {
		super();
		System.out.println("person애개변수");
		this.name=x;
	}
	public String getInfo() {
		return this.name;
	}
}

★int 타입도 "" 붙여줘야함 자동으로 형변환해줌★

package com.spring;
public class Person {
	
		String name;

//	public Person() {
//		super();
//		System.out.println("person 기본생성자");
//	}
	public Person(String x) {
		super();
		System.out.println("person애개변수"+ x);
	}
	public Person(String x, String y) {
		super();
		System.out.println("person애개변수 x,y "+x+"\t"+y);
	}
	public Person(String xx, int yy) {
		super();
		System.out.println("person애개변수 xx,yy "+xx+"\t"+yy);
	}
	public String getInfo() {
		return "홍길동";
	}
}

 

 

bean

<bean class="com.spring.Person" id ="xxx">
<constructor-arg name="x" value ="홍길동"></constructor-arg>
</bean>
<bean class="com.spring.Person" id ="xxx2">
<constructor-arg name="x" value ="유관순"></constructor-arg>
<constructor-arg name="y" value ="제주"></constructor-arg>
</bean>
<bean class="com.spring.Person" id ="xxx3">
<constructor-arg name="xx" value ="유관순"></constructor-arg>
<constructor-arg name="yy" value ="10"></constructor-arg>
<!--  int 타입도 "" 붙여줘야함 자동으로 형변환해줌 -->
</bean>
</beans>

 

 

main

System.out.println("2.xml에서 빈 생성 , 생성 빈 사용 방법=========");
		ApplicationContext ctx = new
				GenericXmlApplicationContext("classpath:com/spring/person.xml");
		Person p1 = ctx.getBean("xxx", Person.class);
		System.out.println(p1);
		System.out.println(p1.getInfo());
		
		System.out.println("==============");
		Person p2 = ctx.getBean("xxx2", Person.class);
		System.out.println(p2);
		System.out.println(p2.getInfo());
		System.out.println("==============");
		Person p3 = ctx.getBean("xxx3", Person.class);
		System.out.println(p3);
		System.out.println(p3.getInfo());

person애개변수홍길동

person애개변수 x,y 유관순 제주

person애개변수 xx,yy 유관순 10

com.spring.Person@4e0ae11f 홍길동

com.spring.Person@238d68ff 홍길동

com.spring.Person@4b86805d 홍길동

 

bean 을 만들어 ref 방식으로 bean안에 넣음

bean

<bean class="com.spring.Cat" id ="pet01">
<constructor-arg name="catName" value ="야옹이"></constructor-arg>
<constructor-arg name="catAge" value ="20"></constructor-arg>
</bean>

<bean class="com.spring.Person" id ="xxx">
<constructor-arg name="username" value ="홍길동"></constructor-arg>
<constructor-arg name="age" value ="10"></constructor-arg>
<constructor-arg name="cat" ref ="pet01"></constructor-arg>
</bean>

 

 

//방법1
		Person person = new Person("홍길동",10,new Cat("야옹이",20));
		//방법 2
		Cat c = new Cat("야옹이", 20);
        Person p = new Person("홍길동", 10, c);
        System.out.println(p.getUsername());
        System.out.println(p.getAge());
        System.out.println(p.getCat());

 

 

방법2 방식으로

ApplicationContext ctx = new
				GenericXmlApplicationContext("classpath:com/spring/person.xml");
		Person xxx = ctx.getBean("xxx", Person.class);
		System.out.println(xxx);
		System.out.println("=============");
		Cat yyy = xxx.getCat();
		System.out.println(yyy);
		System.out.println("==============");
		Cat c = ctx.getBean("pet01", Cat.class);
		System.out.println(c);

 

 

<bean class="com.spring.Cat" id ="pet01">
<constructor-arg name="catName" value ="야옹이"></constructor-arg>
<constructor-arg name="catAge" value ="20"></constructor-arg>
</bean>
<bean class="com.spring.Cat" id ="pet02">
<constructor-arg name="catName" value ="누렁이"></constructor-arg>
<constructor-arg name="catAge" value ="10"></constructor-arg>
</bean>
<bean class="com.spring.Person" id ="xxx">
<constructor-arg name="username" value ="홍길동"></constructor-arg>
<constructor-arg name="age" value ="10"></constructor-arg>
<constructor-arg name="cat" ref ="pet02"></constructor-arg>
</bean>

 

 

ApplicationContext ctx = new
				GenericXmlApplicationContext("classpath:com/spring/person.xml");
		Person xxx = ctx.getBean("xxx", Person.class);
		System.out.println(xxx);
		System.out.println("=============");
		Cat yyy = xxx.getCat();
		System.out.println(yyy);
		System.out.println("==============");
		Cat c = ctx.getBean("pet01", Cat.class);
		System.out.println(c);

 

출력내용

2.xml에서 빈 생성 , 생성 빈 사용 방법=========

생성자 호출야옹이 20

생성자 호출누렁이 10

생성자호출홍길동 10

Cat [catName=누렁이, catAge=10]

Person [username=홍길동, age=10, cat=Cat [catName=누렁이, catAge=10]]

Cat [catName=누렁이, catAge=10]

Cat [catName=야옹이, catAge=20]

 

생성자 추가되면 그걸로 toString 재생성 필수 field 도

package com.spring;

public class Person {
	String username;
	int age;
	Cat cat;
	Dog dog;
	public String getUsername() {
		return username;
	}
	public void setUsername(String username) {
		this.username = username;
	}
	public int getAge() {
		return age;
	}
	public void setAge(int age) {
		this.age = age;
	}
	public Cat getCat() {
		return cat;
	}
	public void setCat(Cat cat) {
		this.cat = cat;
	}

	@Override
	public String toString() {
		return "Person [username=" + username + ", age=" + age + ", cat=" + cat + ", dog=" + dog + "]";
	}
	public Person(String username, int age, Cat cat) {
		super();
		System.out.println("생성자호출"+username+"\t"+age+"\t"+cat);
		this.username = username;
		this.age = age;
		this.cat = cat;
	}
	
	public Person(String username, int age) {
		super();
		System.out.println("생성자호출"+username+"\t"+age);
		this.username = username;
		this.age = age;
		
	}
	public Person(String username, int age, Cat cat, Dog dog) {
		super();
		this.username = username;
		this.age = age;
		this.cat = cat;
		this.dog = dog;
	}
	public Dog getDog() {
		return dog;
	}
	public void setDog(Dog dog) {
		this.dog = dog;
	}

}

 

dao

 

기존방식

DeptService// Dao new 코드 없음

DeptDao 를 생성자를 통해 주입 받도록 구현 Main_0.java …

service.getList 호출 데이터 출력

 

dao

public class DeptDAO {
public List<String> getList(){
	return Arrays.asList("A","B","C");
}
}

 

service

public class DeptService { // new 없음
public DeptDAO dao;

public DeptService(DeptDAO dao) { ///// 
	super();
	this.dao = dao;
}

public DeptService() {
	super();
	// TODO Auto-generated constructor stub
}

public List<String>getList(){
	return dao.getList();
}
public DeptDAO getDao() {
	return dao;
}
public void setDao(DeptDAO dao) {/////
	this.dao = dao;
}

}

 

 

bean

<bean class="com.dao.DeptDAO" id ="deptDAO"></bean>
<bean class="com.service.DeptService" id ="deptService">
<constructor-arg name="dao" ref ="deptDAO"></constructor-arg>
</bean>

 

bean 방법

ApplicationContext ctx = new
				GenericXmlApplicationContext("classpath:com/spring/config.xml");
		DeptService service = ctx.getBean("deptService", DeptService.class);

		List<String> list = service.getList();
		System.out.println(list);

 

 

기존방법

DeptDAO dao = new DeptDAO();////////
        //DeptService service = new DeptService(dao);////생성자를 통한 주입
        
        DeptService service = new DeptService();
        service.setDao(dao);
        List<String> list = service.getList();
        System.out.println(list);