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。