该文章主要为完成实训任务，详细实现过程及结果见【http://t.csdn.cn/1fwEO】

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一、采用Java配置类管理Bean

1.1 创建子包

• 在cn.kox.spring包里创建day04子包
  

1.2 创建杀龙任务类

• 在day04子包里创建杀龙任务类 - SlayDragonQuest
  

package cn.kox.spring.day04;

public class SlayDragonQuest {
    public void embark() {
        System.out.println("执行🗡🏹💣🐉任务...");
    }
}

1.3 创建勇敢骑士类

• 在day04子包里创建勇敢骑士类 - BraveKnight
  

package cn.kox.spring.day04;

public class BraveKnight {
    private String name; // 骑士姓名
    private SlayDragonQuest slayDragonQuest; // 杀龙任务

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

    // 设置杀龙任务
    public void setSlayDragonQuest(SlayDragonQuest slayDragonQuest) {
        this.slayDragonQuest = slayDragonQuest;
    }

    // 勇敢骑士执行任务
    public void embarkOnQuest() {
        System.out.print("勇敢骑士[" + name + "]"); // 骑士留名
        slayDragonQuest.embark(); // 执行杀龙任务
    }
}

1.4 创建Spring配置类

• 在day04子包里创建Spring配置类 - SpringConfig

package cn.kox.spring.day04;

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

@Configuration // 表明是Spring配置类
public class SpringConfig {
    @Bean // 创建名为slayDragonQuest的Bean
    public SlayDragonQuest slayDragonQuest() {
        return new SlayDragonQuest();
    }

    @Bean // 创建名为braveKnight的Bean
    public BraveKnight braveKnight() {
        BraveKnight braveKnight = new BraveKnight();
        braveKnight.setName("罗宾汉");
        braveKnight.setSlayDragonQuest(slayDragonQuest());
        return braveKnight;
    }
}

1.5 创建测试类

• 在/test/java里创建net.huawei.spring.day04包，在包里创建TestKnight类
  

package cn.kox.spring.day04;

import org.junit.After;
import org.junit.Before;
import org.junit.Test;
import org.springframework.context.annotation.AnnotationConfigApplicationContext;

public class TestKnight {
    private AnnotationConfigApplicationContext context; // 基于注解配置类的应用容器

    @Before
    public void init() {
        // 基于注解配置类创建应用容器
        context = new AnnotationConfigApplicationContext(SpringConfig.class);
    }

    @Test
    public void testKnight() {
        // 根据名称从应用容器里获取勇敢骑士对象
        BraveKnight knight = (BraveKnight) context.getBean("braveKnight");
        // 勇敢骑士执行任务
        knight.embarkOnQuest();
    }

    @After
    public void destroy() {
        // 关闭应用容器
        context.close();
    }
}

1.6 运行测试类

二、课堂练习

2.1 创建救美任务类和救美骑士类

• RescueDamselQuest类 - 救美任务类

package cn.kox.spring.day04;

public class RescueDamselQuest {
    public void embark() {
        System.out.println("执行👮‍️💕👰任务...");
    }
}

• RescueDamselKnight类 - 救美骑士类

package cn.kox.spring.day04;

public class RescueDamselKnight {
    private String name;
    private RescueDamselQuest rescueDamselQuest;

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

    public void setRescueDamselQuest(RescueDamselQuest rescueDamselQuest) {
        this.rescueDamselQuest = rescueDamselQuest;
    }

    public void embarkOnQuest() {
        System.out.print("勇敢骑士[" + name + "]");
        rescueDamselQuest.embark();
    }
}

2.2 修改Spring配置类 - 管理救美任务Bean和救美骑士Bean

package cn.kox.spring.day04;

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

@Configuration // 表明是Spring配置类
public class SpringConfig {
    @Bean // 创建名为slayDragonQuest的Bean
    public SlayDragonQuest slayDragonQuest() {
        return new SlayDragonQuest();
    }

    @Bean
    public RescueDamselQuest rescueDamselQuest() {
        return new RescueDamselQuest();
    }

    @Bean // 创建名为braveKnight的Bean
    public BraveKnight braveKnight() {
        BraveKnight braveKnight = new BraveKnight();
        braveKnight.setName("罗宾汉");
        braveKnight.setSlayDragonQuest(slayDragonQuest());
        return braveKnight;
    }

    @Bean
    public RescueDamselKnight rescueDamselKnight() {
        RescueDamselKnight rescueDamselKnight = new RescueDamselKnight();
        rescueDamselKnight.setName("尼古拉四德中间带个K");
        rescueDamselKnight.setRescueDamselQuest(rescueDamselQuest());
        return rescueDamselKnight;

    }
}

2.3 在testKnight()方法里添加救美骑士

    package cn.kox.spring.day04;

    import org.junit.After;
    import org.junit.Before;
    import org.junit.Test;
    import org.springframework.context.annotation.AnnotationConfigApplicationContext;

    public class TestKnight {
        private AnnotationConfigApplicationContext context; // 基于注解配置类的应用容器

        @Before
        public void init() {
            // 基于注解配置类创建应用容器
            context = new AnnotationConfigApplicationContext(SpringConfig.class);
        }

        @Test
        public void testKnight() {
            // 根据名称从应用容器里获取勇敢骑士对象
            BraveKnight knight = (BraveKnight) context.getBean("braveKnight");
            // 勇敢骑士执行任务
            knight.embarkOnQuest();

            RescueDamselKnight knight1 = (RescueDamselKnight) context.getBean("rescueDamselKnight");
            knight1.embarkOnQuest();
        }

        @After
        public void destroy() {
            // 关闭应用容器
            context.close();
        }
    }

2.4 执行测试方法 - testKnight()