Spring Bean的作用域具体实现(单例、多例、请求、会话、Application)

public class Dog {  
    private String name;  
    public void setName(String name) {  
        this.name = name;  
    }  
}

@Component  
public class DogBeanConfig {  
    @Bean  
    public Dog dog() {  
        Dog dog = new Dog();  
        dog.setName("旺旺");  
        return dog;  
    }  
}

@SpringBootTest  
class ApplicationTests {  
    @Autowired  
    private ApplicationContext applicationContext;  
    @Test  
    void contextLoads() {  
        DogBeanConfig dog1 = applicationContext.getBean(DogBeanConfig.class);;  
        System.out.println(dog1);  
    }  
}

@SpringBootTest  
class ApplicationTests {  
    @Autowired  
    private ApplicationContext applicationContext;  
    @Test  
    void contextLoads() {  
        DogBeanConfig dog1 = applicationContext.getBean(DogBeanConfig.class);;  
        System.out.println(dog1);  
        DogBeanConfig dog2 = applicationContext.getBean(DogBeanConfig.class);;  
        System.out.println(dog2);  
    }  
}

@SpringBootTest  
class ApplicationTests {  
    @Autowired  
    private ApplicationContext applicationContext;  
    @Test  
    void contextLoads() {  
        Dog dog1 = applicationContext.getBean(Dog.class);  
        dog1.setName("狗狗1");  
        System.out.println(dog1);  
        System.out.println(dog1.getName());  
        Dog dog2 = applicationContext.getBean(Dog.class);;  
        System.out.println(dog2);  
        System.out.println(dog2.getName());  
    }  
}

@Component  
public class DogBeanConfig {  
    @Bean  
    public Dog dog() {  
        Dog dog = new Dog();  
        dog.setName("旺旺");  
        return dog;  
    }  
    @Bean  
    @Scope(ConfigurableBeanFactory.SCOPE_SINGLETON)  
    public Dog singleDog() {  
        Dog dog = new Dog();  
        return dog;  
    }  
    @Bean  
    @Scope(ConfigurableBeanFactory.SCOPE_PROTOTYPE)  
    public Dog prototype() {  
        Dog dog = new Dog();  
        return dog;  
    }  
    @Bean  
    @RequestScope    
    public Dog requestDog() {  
        Dog dog = new Dog();  
        return dog;  
    }  
    @Bean  
    @SessionScope    
    public Dog sessionDog() {  
        Dog dog = new Dog();  
        return dog;  
    }  
    @Bean  
    @ApplicationScope    
    public Dog applicationDog() {  
        Dog dog = new Dog();  
        return dog;  
    }  
}

@RestController  
public class DogController {  
    @Autowired  
    private Dog singleDog;  
    @Autowired  
    private Dog prototypeDog;  
    @Autowired  
    private Dog requestDog;  
    @Autowired  
    private Dog sessionDog;  
    @Autowired  
    private Dog applicationDog;  
    @Autowired  
    private ApplicationContext applicationContext;  
    @RequestMapping("/single")  
    public String single(){  
        Dog contexDog = (Dog) applicationContext.getBean("singleDog");  
        return "dog: " + singleDog.toString() + ", contextDog: " + contexDog;  
    }  
    @RequestMapping("/prototype")  
    public String prototype() {  
        Dog contextDog = (Dog) applicationContext.getBean("prototypeDog");  
        return "dog: " + prototypeDog.toString() + ", contextDog: " + contextDog;  
    }  
    @RequestMapping("/request")  
    public String request(){  
        Dog contexDog = (Dog) applicationContext.getBean("requestDog");  
        return "dog: " + requestDog.toString() + ", contextDog: " + contexDog;  
    }  
    @RequestMapping("/session")  
    public String session() {  
        Dog contextDog = (Dog) applicationContext.getBean("sessionDog");  
        return "dog: " + sessionDog.toString() + ", contextDog: " + contextDog;  
    }  
    @RequestMapping("/application")  
    public String application() {  
        Dog contextDog = (Dog) applicationContext.getBean("applicationDog");  
        return "dog: " + applicationDog.toString() + ", contextDog: " + contextDog;  
    }  
}