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。