JavaConfig和XML之间的互相引用

JavaConfig引用JavaConfig

   现在，我们临时假设 PersonConfig 已经变得有些笨重，我们想要将其进行拆分。当然，它目前只定义了两个 bean，远远称不上复杂的 Spring 配置。不过，我们假设两个 bean 就已经太多了。

package person;

import org.springframework.beans.factory.annotation.Configurable;
import org.springframework.context.annotation.Bean;

/**
 * Created on 2022/9/3.
 *
 * @author 国洪志
 */
@Configurable
public class PersonConfig{
    @Bean
    public Game game() {
        return new Lol();
    }

    @Bean
    public User user(Game game) {
        return new User(game);
    }
}

   实现的一种方案就是将 PersonConfig拆分，定义到它自己的 Config类中。

package person;

import org.springframework.beans.factory.annotation.Configurable;
import org.springframework.context.annotation.Bean;

/**
 * Created on 2022/9/3.
 *
 * @author 国洪志
 */
@Configurable
public class GameConfig {
    @Bean
    public Game game() {
        return new Lol();
    }
    
}

package person;

import org.springframework.beans.factory.annotation.Configurable;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Import;

/**
 * Created on 2022/9/3.
 *
 * @author 国洪志
 */
@Configurable
@Import(GameConfig.class)
public class UserConfig {
    @Bean
    public User user(Game game) {
        return new User(game);
    }
}

package person;

import org.springframework.context.annotation.Import;

/**
 * Created on 2022/9/3.
 *
 * @author 国洪志
 */
@Configuration
@Import({GameConfig.class,UserConfig.class})
public class PlayGameConfig {
}

在JavaConfig中引用XML

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
  http://www.springframework.org/schema/beans/spring-beans.xsd" >

    <bean id="game" class="person.Lol">
    </bean>

</beans>

package person;

import org.springframework.beans.factory.annotation.Configurable;
import org.springframework.context.annotation.Import;
import org.springframework.context.annotation.ImportResource;

/**
 * Created on 2022/9/3.
 *
 * @author 国洪志
 */
@Configurable
@Import(UserConfig.class)
@ImportResource("classpath:person.xml")
public class PlayGameConfig {
}

在XML中引用XML

XML 配置文件中使用 元素来引用

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
  http://www.springframework.org/schema/beans/spring-beans.xsd" >

    <bean id="game" class="person.Lol">
    </bean>

</beans>

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
  http://www.springframework.org/schema/beans/spring-beans.xsd" >
    <import resource="game.xml" />
    <bean id="user" class="person.User">
        <constructor-arg ref="game"/>
    </bean>

</beans>

在XML中引用JavaConfig

<bean id="user" class="person.User">
    <constructor-arg ref="game"/>
</bean>