Spring - Bean作用域

SingletonBean

package main.com.lee.c_scope;
/**
 * 單例bean
 *
 * @author Lynch
 *
 */
public class SingletonBean {
    public SingletonBean() {
        System.out.println("單例bean構造了。。。");
    }
}

PrototypeBean

package main.com.lee.c_scope;
/**
 * 多例bean
 *
 * @author Lynch
 *
 */
public class PrototypeBean {
    public PrototypeBean() {
        System.out.println("多例bean構造了...");
    }
}

applicationContext.xml

<!-- Bean的作用域 -->
    <bean id="singletonBean" class="main.com.lee.c_scope.SingletonBean" scope="singleton" />
    <bean id="prototypeBean" class="main.com.lee.c_scope.PrototypeBean" scope="prototype" />

Test

package main.com.lee.c_scope;
import org.junit.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
/**
 * Bean的作用域小測
 *
 * @author Lynch
 *
 */
public class BeanScopeTest {
    @Test
    public void demo1() {
        ApplicationContext applicationContext = new ClassPathXmlApplicationContext("applicationContext.xml");
        // 單例bean
        SingletonBean singletonBean1 = (SingletonBean) applicationContext.getBean("singletonBean");
        SingletonBean singletonBean2 = (SingletonBean) applicationContext.getBean("singletonBean");
        System.out.println(singletonBean1);
        System.out.println(singletonBean2);
        // 多例bean
        PrototypeBean prototypeBean1 = (PrototypeBean) applicationContext.getBean("prototypeBean");
        PrototypeBean prototypeBean2 = (PrototypeBean) applicationContext.getBean("prototypeBean");
        System.out.println(prototypeBean1);
        System.out.println(prototypeBean2);
    }
}

out

單例bean構造了。。。
main.com.lee.c_scope.SingletonBean@170bea5
main.com.lee.c_scope.SingletonBean@170bea5
多例bean構造了...
多例bean構造了...
main.com.lee.c_scope.PrototypeBean@f47396
main.com.lee.c_scope.PrototypeBean@d0af9b