SPRING in ACTION 4th Note-Chapter II -002-@ComponentScan, @Autowired usage

First, @ComponentScan

1.

@Configuration    // Description This class is a profile // Open Scan that scans the current class of packages and their child packages publicclass  cdplayerconfig {}

2.

@ComponentScan (basepackages={"Soundsystem", "video"})// scan multiple packages publicclass  cdplayerconfig {}

3.

@ComponentScan (Basepackageclasses={cdplayer.  Class, AAA. class}) // Specify the classes to scan  Public class Cdplayerconfig {}

Second, @Autowired

1. Can be used in the construction method

@Component  Public class Implements MediaPlayer {  private  compactdisc cd;  @Autowired  //@Injectpublic    cdplayer (compactdisc cd) {     this. cd = cd;  }    Public void Play () {    cd.play ();  }}

2. In the Set method

@Autowired  Public void Setcompactdisc (Compactdisc cd) {this. cd = cd;}

3. In the General method

@Autowired  Public void Insertdisc (Compactdisc cd) {this. cd = cd;}

4. If the dependency is not required, you can set the property

@Autowired (required=false) public cdplayer (compactdisc CD) {this . cd = cd;}

5. @inject Replacement Available

1  PackageSoundsystem;2 ImportJavax.inject.Inject;3 Importjavax.inject.Named;4 @Named5  Public classCDPlayer {6 ...7 @Inject8  PublicCDPlayer (Compactdisc cd) {9  This. cd =cd;Ten } One ... A}

SPRING in ACTION 4th Note-Chapter II [ Email protected] , the use of @Autowired