Spring的Bean作用域的单例和多例与Scope的设置-----Spring框架

谁践踏了优雅 2024-03-23 18:53 44阅读 0赞

>     <?xml version="1.0" encoding="UTF-8"?>
>     <beans xmlns="http://www.springframework.org/schema/beans"
>            xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
>            xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd">
>     
>     
>     
>     
>         <bean id="springBean" class="com.powernode.spring6.bean.SpringBean" scope="singleton"></bean>
>     </beans>
> 
> <?xml version="1.0" encoding="UTF-8"?>  
> <beans xmlns="http://www.springframework.org/schema/beans"  
> xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"  
> xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd">  
>   
>   
>   
>   
> <bean id="springBean" class="com.powernode.spring6.bean.SpringBean" scope="singleton"></bean>  
> </beans>

>     package com.powernode.spring6.Test;
>     
>     import com.powernode.spring6.bean.SpringBean;
>     import org.junit.Test;
>     import org.springframework.context.ApplicationContext;
>     import org.springframework.context.support.ClassPathXmlApplicationContext;
>     
>     public class SpringBeanScopeTest
>     {
>         @Test
>         public void TestBeanScope()
>         {
>             //初始化Spring上下文的时候就创建Bean对象了,默认情况下,Bean是单例(Singleton)的,每一次调用getBean的时候都返回那个单例对象
>             ApplicationContext applicationContext = new ClassPathXmlApplicationContext("spring-scope.xml");
>             SpringBean SpringBean = applicationContext.getBean("springBean", SpringBean.class);
>             System.out.println(SpringBean);
>             SpringBean SpringBean1 = applicationContext.getBean("springBean", SpringBean.class);
>             SpringBean SpringBean2 = applicationContext.getBean("springBean", SpringBean.class);
>             //Bean生成的是单例对象
>             System.out.println(SpringBean1 == SpringBean2);
>         }
>         @Test
>         public void TestThreadScope()
>         {
>             ApplicationContext applicationContext = new ClassPathXmlApplicationContext("spring-scope.xml");
>             SpringBean SpringBean = applicationContext.getBean("springBean", SpringBean.class);
>             System.out.println(SpringBean);
>             //Singleton下的跨线程的也是同一个单例对象,多个线程也是一个
>             new Thread(new Runnable()
>             {
>                 @Override
>                 public void run()
>                 {
>                     SpringBean SpringBean1 = applicationContext.getBean("springBean", SpringBean.class);
>                     System.out.println(SpringBean1);
>                 }
>             }).start();
>         }
>     }
> 
> package com.powernode.spring6.Test;  
>   
> import com.powernode.spring6.bean.SpringBean;  
> import org.junit.Test;  
> import org.springframework.context.ApplicationContext;  
> import org.springframework.context.support.ClassPathXmlApplicationContext;  
>   
> public class SpringBeanScopeTest  
> \{  
> @Test  
> public void TestBeanScope()  
> \{  
> //初始化Spring上下文的时候就创建Bean对象了,默认情况下,Bean是单例(Singleton)的,每一次调用getBean的时候都返回那个单例对象  
> ApplicationContext applicationContext = new ClassPathXmlApplicationContext("spring-scope.xml");  
> SpringBean SpringBean = applicationContext.getBean("springBean", SpringBean.class);  
> System.out.println(SpringBean);  
> SpringBean SpringBean1 = applicationContext.getBean("springBean", SpringBean.class);  
> SpringBean SpringBean2 = applicationContext.getBean("springBean", SpringBean.class);  
> //Bean生成的是单例对象  
> System.out.println(SpringBean1 == SpringBean2);  
> \}  
> @Test  
> public void TestThreadScope()  
> \{  
> ApplicationContext applicationContext = new ClassPathXmlApplicationContext("spring-scope.xml");  
> SpringBean SpringBean = applicationContext.getBean("springBean", SpringBean.class);  
> System.out.println(SpringBean);  
> //Singleton下的跨线程的也是同一个单例对象,多个线程也是一个  
> new Thread(new Runnable()  
> \{  
> @Override  
> public void run()  
> \{  
> SpringBean SpringBean1 = applicationContext.getBean("springBean", SpringBean.class);  
> System.out.println(SpringBean1);  
> \}  
> \}).start();  
> \}  
> \}

>     package com.powernode.spring6.bean;
>     
>     import org.slf4j.Logger;
>     import org.slf4j.LoggerFactory;
>     
>     public class SpringBean
>     {
>         private static Logger logger = LoggerFactory.getLogger(SpringBean.class);
>         public SpringBean()
>         {
>             logger.info("无参构造器调用了");
>         }
>     }
> 
> package com.powernode.spring6.bean;  
>   
> import org.slf4j.Logger;  
> import org.slf4j.LoggerFactory;  
>   
> public class SpringBean  
> \{  
> private static Logger logger = LoggerFactory.getLogger(SpringBean.class);  
> public SpringBean()  
> \{  
> logger.info("无参构造器调用了");  
> \}  
> \}