SpringBootBean被加载时进行控制

import org.springframework.context.annotation.ImportSelector;
import org.springframework.core.type.AnnotationMetadata;
public class MyImportSelector implements ImportSelector {
    @Override
    public String[] selectImports(AnnotationMetadata annotationMetadata) {
        try {
            Class<?> name = Class.forName("yi.beans.kun");
            if (name!=null){
                return new String[]{"yi.beans.Cat"};
            }
        }catch (ClassNotFoundException e){
            return new  String[0];
        }
        return null;
    }
}

import org.springframework.context.annotation.Import;
import yi.beans.MyImportSelector;
@Import(MyImportSelector.class)
public class AConfig {
}

import org.springframework.context.ApplicationContext;
import org.springframework.context.annotation.AnnotationConfigApplicationContext;
import yi.config.AConfig;
public class App3 {
    public static void main(String[] args) {
        ApplicationContext context=new AnnotationConfigApplicationContext(AConfig.class);
        String[] names = context.getBeanDefinitionNames();
        for (String name : names) {
            System.out.println(name);
        }
    }
}

import org.springframework.context.annotation.ComponentScan;
@ComponentScan("yi.beans")
public class AConfig {
}

import org.springframework.context.ApplicationContext;
import org.springframework.context.annotation.AnnotationConfigApplicationContext;
import yi.config.AConfig;
public class App3 {
    public static void main(String[] args) {
        ApplicationContext context=new AnnotationConfigApplicationContext(AConfig.class);
        String[] names = context.getBeanDefinitionNames();
        for (String name : names) {
            System.out.println(name);
        }
    }
}

import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;
import org.springframework.boot.autoconfigure.condition.ConditionalOnBean;
import org.springframework.boot.autoconfigure.condition.ConditionalOnClass;
import org.springframework.boot.autoconfigure.condition.ConditionalOnMissinGClass;
import org.springframework.boot.autoconfigure.condition.ConditionalOnNotWEBApplication;
import org.springframework.stereotype.Component;
@ConditionalOnClass(Mouse.class)    //要加载猫，必须要有老鼠这个bean
@ConditionalOnBean(name = "zhizhi")     //而且这个老鼠bean的名字必须是“zhizhi”
@ConditionalOnMissingClass("yi.beans.Dog")      //但是不能有狗，猫捉老鼠不想有狗
@ConditionalOnNotWebApplication     //环境必须为非Web环境
@Component("miao")  //猫的bean叫“miao”
@Data
@NoArgsConstructor
@AllArgsConstructor
public class Cat {
    String shout;
}

import lombok.Data;
@Data
public class Mouse {
    private String name;
    private int age;
}

import lombok.Data;
@Data
public class Cat {
    private String name;
    private int age;
}

import lombok.Data;
import org.springframework.boot.context.properties.ConfigurationProperties;
@Data
@ConfigurationProperties(prefix = "cartoon")    
public class CartoonProperties {
    private Cat cat;
    private Mouse mouse;
}

import lombok.Data;
import org.springframework.boot.context.properties.EnableConfigurationProperties;
import org.springframework.stereotype.Component;
import org.springframework.util.StringUtils;
@Data
@Component
@EnableConfigurationProperties(CartoonProperties.class)
public class CartoonCatAndMouse {
    private Cat cat;
    private Mouse mouse;
    private CartoonProperties cartoonProperties;
    public CartoonCatAndMouse(CartoonProperties cartoonProperties){
        this.cartoonProperties=cartoonProperties;
        this.cat=new Cat();
        this.cat.setName(cartoonProperties.getCat()!=null&& StringUtils.hasText(cartoonProperties.getCat().getName())?
                cartoonProperties.getCat().getName():"Tom");
        this.cat.setAge(cartoonProperties.getCat()!=null&& cartoonProperties.getCat().getAge()!=0?
                cartoonProperties.getCat().getAge():6);
        this.mouse=new Mouse();
        this.mouse.setName(cartoonProperties.getMouse()!=null&&StringUtils.hasText(cartoonProperties.getMouse().getName())?
                cartoonProperties.getMouse().getName():"Jerry");
        this.mouse.setAge(cartoonProperties.getMouse()!=null && cartoonProperties.getMouse().getAge()!=0?
                cartoonProperties.getMouse().getAge():2);
    }
    public void play() {
        System.out.println(cat.getAge()+"岁的"+cat.getName()+"和"+mouse.getAge()+"岁的"+mouse.getName()+"打起来了");
    }
}

import com.yi.bean.CartoonCatAndMouse;
import org.junit.jupiter.api.Test;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;
@SpringBootTest
class SpringbootBean2ApplicationTests {
    @Autowired
    private CartoonCatAndMouse cartoonCatAndMouse;
    @Test
    void contextLoads() {
        cartoonCatAndMouse.play();
    }
}