Spring学习笔记--使用Spring基于Java的配置

我们需要使用@Component注解来定义一个配置类，在配置类中我们定义Bean：

package com.moonlit.myspring;

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

@Configuration
public class MoonlitConfig {
    @Bean
    public Weapon halberd() {
        return new Halberd();
    }
    @Bean
    public Hero guanyu() {
        GuanYu gy = new GuanYu();
        gy.setWeapon(halberd());
        return gy;
    }
}

这里的GuanYu类如下：

package com.moonlit.myspring;

public class GuanYu implements Hero {
    private Weapon weapon;
    public void perform() {
        System.out.println("Guan Yu pick up his weapon.");
        weapon.attack();
    }
    public Weapon getWeapon() {
        return weapon;
    }
    public void setWeapon(Weapon weapon) {
        this.weapon = weapon;
    }
}

然后我们就可以使用这个基于@Bean注解的bean了，下面的测试类用于演示效果：

package com.moonlit.practice;

import com.moonlit.myspring.Hero;
import com.moonlit.myspring.MoonlitConfig;

public class TestPractive {
    public static void main(String[] args) {
        Hero hero = new MoonlitConfig().guanyu();
        hero.perform();
    }
}

输出效果如下:

Guan Yu pick up his weapon.
halberd is attacking!!!