[Spring] 실습 5일차_SpEL_Collection

2022. 3. 19. 17:45

실습 5일차_SpEL

https://docs.spring.io/spring-framework/docs/3.2.x/spring-framework-reference/html/expressions.html

Spring SpEL_Collection_Selection

MainClass.java

 import java.util.List;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.GenericXmlApplicationContext;
import com.dto.ListPerson;
import com.dto.Person;
 
public class MainClass {
	public static void main(String[] args) {
		
		ApplicationContext ctx = new GenericXmlApplicationContext("classpath:com/config/user.xml");
			
		ListPerson listPerson = ctx.getBean("list1", ListPerson.class); //System.out.println(list1);
		List<Person> list1 = listPerson.getList();
		System.out.println("1. 전체 데이터 출력");
		
		for (Person person : list1) {
			System.out.println(person);
		}
		
		ListPerson listPerson2 = ctx.getBean("list2", ListPerson.class); //System.out.println(list1);
		List<Person> list2 = listPerson2.getList();
		System.out.println("2. SpEL 전체 데이터 출력");
		for (Person person : list2) {
			System.out.println(person);
		}
		
		ListPerson listPerson3 = ctx.getBean("list3", ListPerson.class); //System.out.println(list1);
		List<Person> list3 = listPerson3.getList();
		System.out.println("3. SpEL 특정 인덱스 데이터 출력");
		for (Person person : list3) {
			System.out.println(person);
		}
		
		ListPerson listPerson4 = ctx.getBean("list4", ListPerson.class); //System.out.println(list1);
		List<Person> list4 = listPerson4.getList();
		System.out.println("4. SpEL 조건 데이터 출력");
		for (Person person : list4) {
			System.out.println(person);
		}
		
		ListPerson listPerson5 = ctx.getBean("list5", ListPerson.class); //System.out.println(list1);
		List<Person> list5 = listPerson5.getList();
		System.out.println("5. SpEL 멀티 조건 데이터 출력");
		for (Person person : list5) {
			System.out.println(person);
		}
	}
}

ListPerson.java

 package com.dto;
import java.util.List;
 
public class ListPerson {
 
	List<Person> list;
 
	public List<Person> getList() {
		return list;
	}
 
	public void setList(List<Person> list) {
		this.list = list;
	}
 
	@Override
	public String toString() {
		return "ListPerson [list=" + list + "]";
	}
}

Person.java

 package com.dto;
 
public class Person {
	
	String username;
	int age;
	boolean married;
	double weight;
	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 boolean isMarried() {
		return married;
	}
	public void setMarried(boolean married) {
		this.married = married;
	}
	public double getWeight() {
		return weight;
	}
	public void setWeight(double weight) {
		this.weight = weight;
	}
	@Override
	public String toString() {
		return "Person [username=" + username + ", age=" + age + ", married=" + married + ", weight=" + weight + "]";
	}
	
}

user.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"
	xmlns:p="http://www.springframework.org/schema/p"
	xmlns:util="http://www.springframework.org/schema/util"
	xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
		http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util-4.3.xsd">
 
	<util:list id="personList">
		<bean id="p1" class="com.dto.Person" p:username="고길동" p:age="30" p:married="true" p:weight="50" />
		<bean id="p2" class="com.dto.Person" p:username="신길동" p:age="40" p:married="false" p:weight="60" />
		<bean id="p3" class="com.dto.Person" p:username="홍길동" p:age="10" p:married="false" p:weight="70" />
		<bean id="p4" class="com.dto.Person" p:username="이길동" p:age="25" p:married="true" p:weight="60" />
	</util:list>
	
	<bean id="list1" class="com.dto.ListPerson">
		<property name="list" ref="personList" />
	</bean>
	
	<!-- SpEL -->
	<bean id="list2" class="com.dto.ListPerson">
		<property name="list" value="#{personList}"/>
	</bean> 
	
	<!-- SpEL -->
	<bean id="list3" class="com.dto.ListPerson">
		<property name="list" value="#{personList[1]}"/>
	</bean> 
	
	<!-- SpEL -->
	<!-- 행선택(selection) 문법 ===> 참조값.?[조건식] -->
	<bean id="list4" class="com.dto.ListPerson">
		<property name="list" value="#{personList.?[age > 25]}"/>
	</bean> 
	
	<!-- SpEL -->
	<!-- 행선택(selection) 문법 ===> 참조값.?[조건식 and 조건식 or 조건식] -->
	<bean id="list5" class="com.dto.ListPerson">
		<property name="list" value="#{personList.?[age > 25 and married == true]}"/>
	</bean>
 
</beans>

* 출력 화면

Spring SpEL_Collection_Projection

MainClass.java

 import java.util.List;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.GenericXmlApplicationContext;
import com.dto.ListPerson;
import com.dto.Person;
 
public class MainClass {
	public static void main(String[] args) {
 
		ApplicationContext ctx =
				new GenericXmlApplicationContext("classpath:com/config/user.xml");
		
		ListPerson listPerson1 = ctx.getBean("list1", ListPerson.class);
	    List<String> usernameList = listPerson1.getUsernameList();
	    System.out.println("1. username 프라퍼티 전체 출력");
	    for (String name : usernameList) {
			System.out.println(name);
		}
	
	    ListPerson listPerson2 = ctx.getBean("list2", ListPerson.class);
	    List<Integer> ageList = listPerson2.getAgeList();
	    System.out.println("2. age 프라퍼티 전체 출력");
	    for (int age : ageList) {
			System.out.println(age);
		}
	
	}
}

ListPerson.java

 package com.dto;
import java.util.List;
 
public class ListPerson {
 
	// selection
	List<Person> list;
	
	// projection
	List<String> usernameList;
	List<Integer> ageList;
	
	public List<String> getUsernameList() {
		return usernameList;
	}
 
	public void setUsernameList(List<String> usernameList) {
		this.usernameList = usernameList;
	}
 
	public List<Integer> getAgeList() {
		return ageList;
	}
 
	public void setAgeList(List<Integer> ageList) {
		this.ageList = ageList;
	}
 
	public List<Person> getList() {
		return list;
	}
 
	public void setList(List<Person> list) {
		this.list = list;
	}
 
	@Override
	public String toString() {
		return "ListPerson [list=" + list + "]";
	}
	
}

Person.java

 package com.dto;
 
public class Person {
 
	String username;
	int age;
	boolean married;
	double weight;
	
	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 boolean isMarried() {
		return married;
	}
	public void setMarried(boolean married) {
		this.married = married;
	}
	public double getWeight() {
		return weight;
	}
	public void setWeight(double weight) {
		this.weight = weight;
	}
	@Override
	public String toString() {
		return "Person [username=" + username + ", age=" + age + ", married=" + married + ", weight=" + weight + "]";
	}
}

user.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"
	xmlns:util="http://www.springframework.org/schema/util"
	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/util http://www.springframework.org/schema/util/spring-util-4.3.xsd">
 
	<util:list id="personList">
	   <bean id="p1" class="com.dto.Person" p:username="홍길동" p:age="30" p:married="true" p:weight="78.6" />
	   <bean id="p2" class="com.dto.Person" p:username="고길동" p:age="40" p:married="false" p:weight="100.2" />
	   <bean id="p3" class="com.dto.Person" p:username="신길동" p:age="10" p:married="false" p:weight="56.2" />
	   <bean id="p4" class="com.dto.Person" p:username="이길동" p:age="23" p:married="true" p:weight="75.6" />
	</util:list>
	
	 <!-- 
	   selection 문법:  참조변수.?[조건식] , 참조변수.?[조건식 and 조건식 or 조건식] 
	 -->
	 
	 <!-- 
	     projection 문법:  참조변수.![property]  
	 -->
	 <bean id="list1" class="com.dto.ListPerson">
	   <property name="usernameList" value="#{personList.![username]}" />
	 </bean>
	 
	 <bean id="list2" class="com.dto.ListPerson">
	   <property name="ageList" value="#{personList.![age]}" />
	 </bean>
</beans>

* 출력 화면

Spring SpEL_Collection_Selection & Projection

MainClass.java

 import java.util.List;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.GenericXmlApplicationContext;
import com.dto.ListPerson;
import com.dto.Person;
 
public class MainClass {
	public static void main(String[] args) {
 
		ApplicationContext ctx =
				new GenericXmlApplicationContext("classpath:com/config/user.xml");
		
		ListPerson listPerson1 = ctx.getBean("list1", ListPerson.class);
	    List<String> usernameList = listPerson1.getUsernameList();
	    System.out.println("1. username 프라퍼티 조건 출력");
	    for (String name : usernameList) {
			System.out.println(name);
		}
	
	    ListPerson listPerson2 = ctx.getBean("list2", ListPerson.class);
	    List<Integer> ageList = listPerson2.getAgeList();
	    System.out.println("2. age 프라퍼티 조건 출력");
	    for (int age : ageList) {
			System.out.println(age);
		}
	
	}
}

ListPerson.java

 package com.dto;
import java.util.List;
 
public class ListPerson {
	
	// selection
	List<Person> list;
	
	// projection
	List<String> usernameList;
	List<Integer> ageList;
	
	public List<String> getUsernameList() {
		return usernameList;
	}
 
	public void setUsernameList(List<String> usernameList) {
		this.usernameList = usernameList;
	}
 
	public List<Integer> getAgeList() {
		return ageList;
	}
 
	public void setAgeList(List<Integer> ageList) {
		this.ageList = ageList;
	}
 
	public List<Person> getList() {
		return list;
	}
 
	public void setList(List<Person> list) {
		this.list = list;
	}
 
	@Override
	public String toString() {
		return "ListPerson [list=" + list + ", usernameList=" + usernameList + ", ageList=" + ageList + "]";
	}
 
}

Person.java

 package com.dto;
 
public class Person {
	
	String username;
	int age;
	boolean married;
	double weight;
	
	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 boolean isMarried() {
		return married;
	}
	public void setMarried(boolean married) {
		this.married = married;
	}
	public double getWeight() {
		return weight;
	}
	public void setWeight(double weight) {
		this.weight = weight;
	}
	@Override
	public String toString() {
		return "Person [username=" + username + ", age=" + age + ", married=" + married + ", weight=" + weight + "]";
	}
	
}

user.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"
	xmlns:util="http://www.springframework.org/schema/util"
	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/util http://www.springframework.org/schema/util/spring-util-4.3.xsd">
 
	<util:list id="personList">
	   <bean id="p1" class="com.dto.Person" p:username="고길동" p:age="30" p:married="true" p:weight="78.6" />
	   <bean id="p2" class="com.dto.Person" p:username="신길동" p:age="40" p:married="false" p:weight="100.2" />
	   <bean id="p3" class="com.dto.Person" p:username="홍길동" p:age="10" p:married="false" p:weight="56.2" />
	   <bean id="p4" class="com.dto.Person" p:username="이길동" p:age="23" p:married="true" p:weight="75.6" />
	</util:list>
	
	 <!-- 
	   selection 문법:  참조변수.?[조건식] , 참조변수.?[조건식 and 조건식 or 조건식] 
	 -->
	 
	 <!-- 
	     projection 문법:  참조변수.![property]  
	 -->
	 
	 <!-- 
	     selection 및 projection 조합
	         ==> 참조변수.?[조건식].![property]
	  -->
	 <bean id="list1" class="com.dto.ListPerson">
	   <property name="usernameList" value="#{personList.?[age > 25].![username]}" />
	 </bean>
	 
	 <bean id="list2" class="com.dto.ListPerson">
	   <property name="ageList" value="#{personList.?[married==true].![age]}" />
	 </bean>
</beans>

* 출력 화면

출처

+ 강의 교재

'AI Bootcamp > Spring' 카테고리의 다른 글

[Spring] Could not publish server configuration for Tomcat v8.5 Server at localhost.Multiple Contexts have a path of "/app". (0)	2022.03.20
[Spring] 실습 5일차_AOP (0)	2022.03.20
[Spring] 실습 5일차_SpEL (0)	2022.03.19
[Spring] 실습 4일차_MyBatis_Transaction★ (0)	2022.03.18
[Spring] 실습 4일차_MyBatis ★ (0)	2022.03.18

내 블로그 - 관리자 홈 전환	`Q` `Q`
새 글 쓰기	`W` `W`

글 수정 (권한 있는 경우)	`E` `E`
댓글 영역으로 이동	`C` `C`

이 페이지의 URL 복사	`S` `S`
맨 위로 이동	`T` `T`
티스토리 홈 이동	`H` `H`
단축키 안내	`Shift` + `/` `⇧` + `/`

deeprun

[Spring] 실습 5일차_SpEL_Collection

실습 5일차_SpEL

Spring SpEL_Collection_Selection

Spring SpEL_Collection_Projection

Spring SpEL_Collection_Selection & Projection

출처

'AI Bootcamp > Spring' 카테고리의 다른 글

+ Recent posts

티스토리툴바

단축키

내 블로그

블로그 게시글

모든 영역

	import java.util.List;
	import org.springframework.context.ApplicationContext;
	import org.springframework.context.support.GenericXmlApplicationContext;
	import com.dto.ListPerson;
	import com.dto.Person;

	public class MainClass {
	public static void main(String[] args) {

	ApplicationContext ctx = new GenericXmlApplicationContext("classpath:com/config/user.xml");

	ListPerson listPerson = ctx.getBean("list1", ListPerson.class); //System.out.println(list1);
	List<Person> list1 = listPerson.getList();
	System.out.println("1. 전체 데이터 출력");

	for (Person person : list1) {
	System.out.println(person);
	}

	ListPerson listPerson2 = ctx.getBean("list2", ListPerson.class); //System.out.println(list1);
	List<Person> list2 = listPerson2.getList();
	System.out.println("2. SpEL 전체 데이터 출력");
	for (Person person : list2) {
	System.out.println(person);
	}

	ListPerson listPerson3 = ctx.getBean("list3", ListPerson.class); //System.out.println(list1);
	List<Person> list3 = listPerson3.getList();
	System.out.println("3. SpEL 특정 인덱스 데이터 출력");
	for (Person person : list3) {
	System.out.println(person);
	}

	ListPerson listPerson4 = ctx.getBean("list4", ListPerson.class); //System.out.println(list1);
	List<Person> list4 = listPerson4.getList();
	System.out.println("4. SpEL 조건 데이터 출력");
	for (Person person : list4) {
	System.out.println(person);
	}

	ListPerson listPerson5 = ctx.getBean("list5", ListPerson.class); //System.out.println(list1);
	List<Person> list5 = listPerson5.getList();
	System.out.println("5. SpEL 멀티 조건 데이터 출력");
	for (Person person : list5) {
	System.out.println(person);
	}
	}
	}

	package com.dto;
	import java.util.List;

	public class ListPerson {

	List<Person> list;

	public List<Person> getList() {
	return list;
	}

	public void setList(List<Person> list) {
	this.list = list;
	}

	@Override
	public String toString() {
	return "ListPerson [list=" + list + "]";
	}
	}

	package com.dto;

	public class Person {

	String username;
	int age;
	boolean married;
	double weight;
	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 boolean isMarried() {
	return married;
	}
	public void setMarried(boolean married) {
	this.married = married;
	}
	public double getWeight() {
	return weight;
	}
	public void setWeight(double weight) {
	this.weight = weight;
	}
	@Override
	public String toString() {
	return "Person [username=" + username + ", age=" + age + ", married=" + married + ", weight=" + weight + "]";
	}

	}

	<?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"
	xmlns:util="http://www.springframework.org/schema/util"
	xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
	http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util-4.3.xsd">

	<util:list id="personList">
	<bean id="p1" class="com.dto.Person" p:username="고길동" p:age="30" p:married="true" p:weight="50" />
	<bean id="p2" class="com.dto.Person" p:username="신길동" p:age="40" p:married="false" p:weight="60" />
	<bean id="p3" class="com.dto.Person" p:username="홍길동" p:age="10" p:married="false" p:weight="70" />
	<bean id="p4" class="com.dto.Person" p:username="이길동" p:age="25" p:married="true" p:weight="60" />
	</util:list>

	<bean id="list1" class="com.dto.ListPerson">
	<property name="list" ref="personList" />
	</bean>

	<!-- SpEL -->
	<bean id="list2" class="com.dto.ListPerson">
	<property name="list" value="#{personList}"/>
	</bean>

	<!-- SpEL -->
	<bean id="list3" class="com.dto.ListPerson">
	<property name="list" value="#{personList[1]}"/>
	</bean>

	<!-- SpEL -->
	<!-- 행선택(selection) 문법 ===> 참조값.?[조건식] -->
	<bean id="list4" class="com.dto.ListPerson">
	<property name="list" value="#{personList.?[age > 25]}"/>
	</bean>

	<!-- SpEL -->
	<!-- 행선택(selection) 문법 ===> 참조값.?[조건식 and 조건식 or 조건식] -->
	<bean id="list5" class="com.dto.ListPerson">
	<property name="list" value="#{personList.?[age > 25 and married == true]}"/>
	</bean>

	</beans>