SPRing從兩個角度實現自動化裝配：組件掃描 （Spring自動發現應用上下文中所創建的bean）自動裝配（autowiring）自動滿足bean之間的依賴

組件掃描：

package test.soundsystem;import org.springframework.context.annotation.ComponentScan;import org.springframework.context.annotation.Configuration;import test.voice.Book;/* * 使用basePackageClasses,spring會自動掃描這些類所在的包， * 建議在包中寫空標記接口，用來被掃描，有利于項目重構。 *  * */@Configuration@ComponentScan(basePackageClasses={Book.class,CompactDisc.class})public class CDPlayerConfig {}接口：
package test.soundsystem;public interface CompactDisc {	void play();}實現類：
package test.soundsystem;import javax.inject.Named;//Named 和 Component相似@Namedpublic class SgtPeppers implements CompactDisc {	private String title="Sgt. Pepper's Lonely Hearts Club Band";	private String artist = "The Beatles";	public void play() {		System.out.println("Playing "+title+" by "+artist);	}}測試類：
package test.soundsystem;import javax.inject.Inject;import org.junit.Test;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 test.voice.Book;@RunWith(SpringJUnit4ClassRunner.class)@ContextConfiguration(classes=CDPlayerConfig.class)public class CDPlayerTest {	@Autowired	private CompactDisc cd;		@Inject	private Book book;		@Test	public void cdShouldNotBeNull(){		cd.play();		book.read();	}}