spring装配bean-xml

最新推荐文章于 2025-04-06 22:37:36 发布

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最新推荐文章于 2025-04-06 22:37:36 发布

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分类专栏： # spring

本文链接：https://blog.youkuaiyun.com/YKWNDY/article/details/81745159

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本文通过一个具体的示例，展示了如何使用Spring框架进行依赖注入，包括定义接口、实现类、配置文件以及单元测试验证。

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其他参考文章：https://blog.youkuaiyun.com/m0_37630602/article/details/70229501

package springinaction.soundsystem.xml;
import org.springframework.beans.factory.annotation.Autowired;

public class CDPlayer implements MediaPlayer {
  private CompactDisc cd;

  @Autowired
  public CDPlayer(CompactDisc cd) {
    this.cd = cd;
  }

  @Override
  public void play() {
    cd.play();
  }

}

package springinaction.soundsystem.xml;

public interface CompactDisc {

  void play();

}

package springinaction.soundsystem.xml;

public interface MediaPlayer {

  void play();

}

package springinaction.soundsystem.xml;

public class SgtPeppers implements CompactDisc {

  private String title = "Sgt. Pepper's Lonely Hearts Club Band";  
  private String artist = "The Beatles";
  @Override
  public void play() {
    System.out.println("Playing " + title + " by " + artist);
  }

}

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

    <bean id="compactDisc" class="springinaction.soundsystem.xml.SgtPeppers"/>

    <bean id="cdPlayer" class="springinaction.soundsystem.xml.CDPlayer"
          c:cd-ref="compactDisc" />
</beans>

import org.junit.Rule;
import org.junit.Test;
import org.junit.contrib.java.lang.system.SystemOutRule;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.test.context.ContextConfiguration;
import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;
import springinaction.soundsystem.xml.MediaPlayer;

import static org.junit.Assert.assertEquals;

@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration(locations = "classpath:assembly-bean-xml.xml")
public class CNamespaceReferenceTest {

  @Rule
  public final SystemOutRule log = new SystemOutRule().enableLog();

  @Autowired
  private MediaPlayer player;

  @Test
  public void play() {
    player.play();
    assertEquals(
        "Playing Sgt. Pepper's Lonely Hearts Club Band by The Beatles\r\n",
        log.getLog());

  }

}