用@Component注解代替@Configuration注解，定义bean

 1 package com.timo.entity;
 2 
 3 import org.springframework.beans.factory.annotation.Value;
 4 import org.springframework.stereotype.Repository;
 5 import org.springframework.stereotype.Service;
 6 
 7 /**
 8  * 这里可以写@Component,@Service,@Controller注解，写@Repository注解会报错
 9  * 报错的原因是在配置文件或者注解排除了@Repository.
10  */
11 @Service
12 public class Dog {
13 //    @Value("pug")
14     private String name;
15 //    @Value("18")
16     private Integer age;
17 
18     public String getName() {
19         return name;
20     }
21 
22     public void setName(String name) {
23         this.name = name;
24     }
25 
26     public Integer getAge() {
27         return age;
28     }
29 
30     public void setAge(Integer age) {
31         this.age = age;
32     }
33 }

 1 package com.timo.entity;
 2 
 3 import org.springframework.beans.factory.annotation.Autowired;
 4 import org.springframework.stereotype.Component;
 5 
 6 @Component
 7 public class Master {
 8     @Autowired
 9     private Dog dog;
10     private String name;
11 
12     public String getName() {
13         return name;
14     }
15 
16     public Master(String name) {
17         this.name = name;
18     }
19 
20     public void setName(String name) {
21         this.name = name;
22     }
23 
24     public Dog getDog() {
25         return dog;
26     }
27 
28     public void setDog(Dog dog) {
29         this.dog = dog;
30     }
31     public void showDogInfo(){
32         System.out.println("name="+dog.getName());
33         System.out.println("age="+dog.getAge());
34     }
35 }

package com.timo.entity;

import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Lazy;
import org.springframework.context.annotation.Scope;
import org.springframework.context.annotation.ScopedProxyMode;
import org.springframework.stereotype.Component;

@Component
public class FactoryMethodComponent {
    @Bean
    @Scope("prototype")
    public static Dog dog(){
        Dog dog = new Dog();
        dog.setAge(20);
        dog.setName("人民");
        return  dog;
    }
    @Bean
    public static Master master(){
        Master master = new Master("ouyangfeng");
        master.setDog(dog());

        return  master;
    }
    public void doWork(){
        System.out.println("I can do everything");
    }
}

测试类的代码如下：

package com.timo.test2;

import com.timo.entity.Dog;
import com.timo.entity.FactoryMethodComponent;
import com.timo.entity.Master;
import org.springframework.context.annotation.AnnotationConfigApplicationContext;

public class Test5 {
    public static void main(String[] args) {
        AnnotationConfigApplicationContext applicationContext = new AnnotationConfigApplicationContext(FactoryMethodComponent.class);
        Dog dog = applicationContext.getBean(Dog.class);
        System.out.println("name="+dog.getName());
        System.out.println("age="+dog.getAge());
        System.out.println("***********************");
        FactoryMethodComponent factoryMethodComponent = applicationContext.getBean(FactoryMethodComponent.class);
        factoryMethodComponent.doWork();
        Master master = applicationContext.getBean(Master.class);
        System.out.println("master "+master.getDog().getName());
    }
}