SpringBoot的Bean

实体类:Dog.java

package club.swzdl.springboot.domain.entities;
/*
 * @Author Sheng WenZeng
 * @Date 2019/9/22 22:50
 * @Version 1.0
 */

/**
 * @author Sheng Wenzeng
 * @ClassName Dog
 * @Description TODO
 * @Date 2019/9/22 22:50
 * @Version 1.0
 */
public class Dog {
    private String name;
    private int age;

    public int getAge() {
        return age;
    }

    void setAge(int age) {
        this.age = age;
    }

    @Override
    public String toString() {
        return "Dog{" +
                "name='" + name + '\'' +
                ", age=" + age +
                '}';
    }

    public String getName() {
        return name;
    }

    void setName(String name) {
        this.name = name;
    }
}

相当于 Spring 的 xml 配置文件BeanConfigOfDog.java

package club.swzdl.springboot.domain.entities;/*
 * @Author Sheng WenZeng
 * @Date 2019/9/22 22:14
 * @Version 1.0
 */

import org.springframework.context.annotation.Configuration;

/**
 * @author Sheng Wenzeng
 * @ClassName Dog
 * @Description TODO
 * @Date 2019/9/22 22:14
 * @Version 1.0
 */

/*
 * 本文件就相当于 Spring 的 xml 配置文件,相当于 Dog.java 的 Spring 配置文件
 */
@Configuration
public class BeanConfigOfDog {

    @org.springframework.context.annotation.Bean()
    public Dog dog_1() {
        Dog dog = new Dog();
        dog.setName("Tom");
        dog.setAge(1);
        return dog;
    }

    @org.springframework.context.annotation.Bean()
    public Dog dog_2() {
        Dog dog = new Dog();
        dog.setName("Jack");
        dog.setAge(2);
        return dog;
    }
}

两种装配方式:入口函数:SpringBootApplication.java

package club.swzdl.springboot;

import club.swzdl.springboot.domain.entities.Dog;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

import javax.annotation.Resource;

@SpringBootApplication
@RestController
public class SpringbootApplication {

    /*
     * 指定要装配的 Bean 的名字
     */
    @Resource(name = "dog_1")
    Dog dog_1;

    /*
     * 自动装配,默认与名字相同,即注入名为 dog_2 的 Bean
     */
    @Autowired
    Dog dog_2;

    public static void main(String[] args) {
        SpringApplication.run(SpringbootApplication.class, args);
    }

    @RequestMapping("/getBeans")
    public String getBeans() {
        System.out.println(dog_1.toString());
        System.out.println(dog_2.toString());
        return "";
    }
}

运行结果

Dog{name='Tom', age=1}
Dog{name='Jack', age=2}