3. Spring4.x BeanのScope

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BeanのScopeの簡単な例
@Scopeで次のパラメータ値を指定します.

Singleton         ( )
Prototype        
Request         web request 
Session         web session 

GlobalSession   portal ( ...)

新しいScope Singletonクラス

package com.xiaohan.scope;

import org.springframework.stereotype.Service;

@Service
//  
// @Scope("singleton")
public class SingletonService {
}

新しいScopeをPrototypeとするクラス

package com.xiaohan.scope;

import org.springframework.context.annotation.Scope;
import org.springframework.stereotype.Service;

@Service
@Scope("prototype")
public class PrototypeService {
}

構成クラス

package com.xiaohan.scope;

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

@Configuration
@ComponentScan("com.xiaohan.scope")
public class ScopeConfig {
}

Mainテスト

package com.xiaohan.scope;

import org.springframework.context.ApplicationContext;
import org.springframework.context.annotation.AnnotationConfigApplicationContext;

// Bean Scope
public class Main {
    public static void main(String[] args) {
        ApplicationContext ac = new AnnotationConfigApplicationContext(ScopeConfig.class);
        SingletonService s1 = ac.getBean(SingletonService.class);
        SingletonService s2 = ac.getBean(SingletonService.class);
        System.err.println(s1.equals(s2));  //true

        PrototypeService p1 = ac.getBean(PrototypeService.class);
        PrototypeService p2 = ac.getBean(PrototypeService.class);
        System.err.println(p1.equals(p2));  //false
    }
}

コード作成ツール(反射を復習)

1946号-新入社員(c++)