spring in action 学习笔记九：如何证明在scope为prototype时每次创建的对象不同。

　　spring 中scope的值有四个：分别是：singleton、prototype、session、request。其中session和request是在web应用中的。

下面证明当scope为prototype时每次创建的对象是不同的。

示例代码如下：

 package com.advancedWiring.ambiguityIniAutowiring2;

 import org.springframework.beans.factory.BeanNameAware;

 import org.springframework.beans.factory.config.ConfigurableBeanFactory;

 import org.springframework.context.annotation.Scope;

 import org.springframework.stereotype.Component;

 /**

  * Created by ${秦林森} on 2017/6/9.

  */

 @Component

 @Scope(ConfigurableBeanFactory.SCOPE_PROTOTYPE)

 public class Student implements BeanNameAware{

     private  String name;

     private Integer age;

     public String getName() {

         return name;

     }

     public void setName(String name) {

         this.name = name;

     }

     public Integer getAge() {

         return age;

     }

     public void setAge(Integer age) {

         this.age = age;

     }

     @Override

     public void setBeanName(String name) {

         System.out.println("the Student bean name is :"+name);

     }

 }

 package com.advancedWiring.ambiguityIniAutowiring2;

 import org.springframework.beans.factory.config.ConfigurableBeanFactory;

 import org.springframework.context.annotation.Bean;

 import org.springframework.context.annotation.ComponentScan;

 import org.springframework.context.annotation.Configuration;

 import org.springframework.context.annotation.Scope;

 /**

  * Created by ${秦林森} on 2017/6/9.

  */

 @Configuration

 @ComponentScan

 public class StudentConfig {

 }

 package com.advancedWiring.ambiguityIniAutowiring2;

 import org.springframework.context.annotation.AnnotationConfigApplicationContext;

 import org.springframework.context.support.ClassPathXmlApplicationContext;

 /**

  * Created by ${秦林森} on 2017/6/9.

  */

 public class Test {

     public static void main(String[] args) {

         AnnotationConfigApplicationContext ac = new AnnotationConfigApplicationContext(StudentConfig.class);

         Student student = ac.getBean(Student.class);

         Student student2 = ac.getBean(Student.class);

         System.out.println(student==student2);

     }

 }/**output:
false/

上面的测试类的运行结果是false，就说明了在scope为prototype时，spring每次创建的bean都是一个全新的对象。