• Homepage
  • Articoli
  • Generale
  • Spring Framework 4.3.4 @Order Annotation Tutorial – Ordina per un componente Bean annotato

Spring Framework 4.3.4 @Order Annotation Tutorial – Ordina per un componente Bean annotato

Pubblicato: 2017-03-04

Framework Web MVC: Spring è il miglior framework di controller Web e modello di configurazione per l'applicazione aziendale di programmazione basata su Java.

Finora abbiamo più di 40 tutorial Spring MVC su Crunchify. In questo tutorial esamineremo @Order Annotation . A cosa serve @Order in primavera? Aspetti di ordinazione con Spring AOP e MVC .

Ecco i brevi passaggi:

  • Creeremo un progetto Web dinamico
  • Crea il file Spring Config crunchify-bean.xml
  • Convertilo in Maven Project
  • Crea fagioli con l'annotazione dell'ordine
  • Crea test-case ed esegui

Passaggi dettagliati: iniziamo

Passo 1

  1. Vai a Eclipse
  2. Fare clic su File
  3. Fare clic su New
  4. Fare clic su Dynamic Web Project

Crea un progetto Web dinamico - Eclipse - Crunchify Tips

Passo 2

  1. Fornisci il nome del progetto: CrunchifySpringMVC4OrderAnnotation
  2. Fornisci il runtime di destinazione. Principalmente posizione di Apache Tomcat in Eclipse.
  3. Scegli la versione del modulo Web dinamico: 3.1

Target Runtime 8.0 e Modulo Web Dinamico 3.1

Passaggio 3

  1. Fare clic con il tasto destro del mouse sul progetto
  2. Fare clic su Configura
  3. Converti progetto in progetto Maven

Converti progetto in Maven

Passaggio 4

Scegli l'impostazione predefinita e fai clic su Finish .

ID gruppo Maven e ID artefatto per il progetto Maven

Passaggio 5

Ecco una struttura del progetto prima di iniziare.

Spring-MVC-@Order-Annotation-Tutorial-Java-Eclipse-Project-Structure-Crunchify-Spring Config File

Apri il file pom.xml e aggiungi la dipendenza Spring MVC 4.3.4.

Spring MVC 4.2.3 dependency
1
2
3
4
5
< dependency >
< groupId > org . springframework < / groupId >
< artifactId > spring - context < / artifactId >
< version > 4.3.4.RELEASE < / version >
< / dependency >

ecco il mio file pom.xml completo

pom.xml file
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
< project xmlns = "http://maven.apache.org/POM/4.0.0" xmlns : xsi = "http://www.w3.org/2001/XMLSchema-instance" xsi : schemaLocation = "http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd" >
   < modelVersion > 4.0.0 < / modelVersion >
   < groupId > CrunchifySpringMVC4OrderAnnotation < / groupId >
   < artifactId > CrunchifySpringMVC4OrderAnnotation < / artifactId >
   < version > 0.0.1 - SNAPSHOT < / version >
   < packaging > war < / packaging >
   < build >
     < sourceDirectory > src < / sourceDirectory >
     < plugins >
       < plugin >
         < artifactId > maven - compiler - plugin < / artifactId >
         < version > 3.3 < / version >
         < configuration >
           < source > 1.8 < / source >
           < target > 1.8 < / target >
         < / configuration >
       < / plugin >
       < plugin >
         < artifactId > maven - war - plugin < / artifactId >
         < version > 2.6 < / version >
         < configuration >
           < warSourceDirectory > WebContent < / warSourceDirectory >
           < failOnMissingWebXml > false < / failOnMissingWebXml >
         < / configuration >
       < / plugin >
     < / plugins >
   < / build >
   < dependencies >
   < dependency >
   < groupId > org . springframework < / groupId >
   < artifactId > spring - context < / artifactId >
   < version > 4.3.4.RELEASE < / version >
   < / dependency >
   < / dependencies >
< / project >

Passaggio 6

  1. Fare clic con il tasto destro su Risorse Java
  2. Fare clic su Nuovo
  3. Fare clic sulla cartella di origine e fornire il nome: resources

Crea la cartella delle risorse in Risorse Java

Passaggio 7

Crea il file crunchify-bean.xml nella cartella delle risorse. Ecco un contenuto completo del file.

crunchify-bean.xml
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
<? 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 : p = "http://www.springframework.org/schema/p"
xmlns : context = "http://www.springframework.org/schema/context"
xsi : schemaLocation = "http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-4.0.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context-4.0.xsd" >
 
< context : annotation - config / >
< ! -- Specify Bean ID "orders" -- >
< bean id = "orders" class = "com.crunchify.spring.tutorials.CrunchifyPrintResult" / >
< ! -- This is required and loads each class under below package -- >
< context : component - scan base - package = "com.crunchify.spring.tutorials" / >
< / beans >

Passaggio 8

Ora creeremo 5 file con l'annotazione @Order .

  1. Interfaccia CrunchifyCompany.java
  2. CrunchifyGoogle1.java ==> Con @Order(1)
  3. CrunchifyFacebook2.java ==> Con @Order(2)
  4. CrunchifyYahoo3.java ==> Con @Order(3)
  5. CrunchifyPrintResult.java

CrunchifyCompany.java

CrunchifyCompany.java
Java
1
2
3
4
5
6
7
8
9
10
package com . crunchify . spring . tutorials ;
 
/**
* @author Crunchify.com
*
*/
 
public interface CrunchifyCompany {
// do nothing here
}

CrunchifyGoogle1.java

CrunchifyGoogle1.java
Java
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
package com . crunchify . spring . tutorials ;
 
import org . springframework . core . annotation . Order ;
import org . springframework . stereotype . Component ;
 
/**
* @author Crunchify.com
*
*/
 
@Component
@Order ( 1 ) // @Order defines the sort order for an annotated component. The value() is optional and represents an order value as
// defined in the Ordered interface. Lower values have higher priority. The default value is
// Ordered.LOWEST_PRECEDENCE, indicating lowest priority (losing to any other specified order value).
public class CrunchifyGoogle1 implements CrunchifyCompany {
 
private String order = "Crunchify Google with Order-1" ;
 
public String toString ( ) {
return "Class Name: " + this . getClass ( ) . getSimpleName ( ) + " - Result: " + this . order ;
}
}

CrunchifyFacebook2.java

CrunchifyFacebook2.java
Java
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
package com . crunchify . spring . tutorials ;
 
import org . springframework . core . annotation . Order ;
import org . springframework . stereotype . Component ;
 
@Component
@Order ( 2 )
public class CrunchifyFacebook2 implements CrunchifyCompany {
 
private String order = "Crunchify Facebook with Order-2" ;
 
public String toString ( ) {
return "Class Name: " + this . getClass ( ) . getSimpleName ( ) + " - Result: " + this . order ;
}
}

CrunchifyYahoo3.java

CrunchifyYahoo3.java
Java
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
package com . crunchify . spring . tutorials ;
 
import org . springframework . core . annotation . Order ;
import org . springframework . stereotype . Component ;
 
@Component
@Order ( 3 )
public class CrunchifyYahoo3 implements CrunchifyCompany {
 
private String order = "Crunchify Yahoo with Order-3" ;
 
public String toString ( ) {
return "Class Name: " + this . getClass ( ) . getSimpleName ( ) + " - Result: " + this . order ;
}
}

CrunchifyPrintResult.java

CrunchifyPrintResult.java
Java
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
package com . crunchify . spring . tutorials ;
 
import java . util . List ;
 
import org . springframework . beans . factory . annotation . Autowired ;
import org . springframework . stereotype . Component ;
 
/**
* @author Crunchify.com
*
*/
 
@Component
public class CrunchifyPrintResult {
@Autowired
private List <CrunchifyCompany> order ;
private String result = "" ;
 
public String toString ( ) {
order . stream ( ) . forEach ( ( temp ) - > {
this . result = result + temp + "\n" ; // print result and add new line
} ) ;
return this . result ;
}
}

Passaggio 9

Ora creiamo testcase CrunchifyOrderTest.java

CrunchifyOrderTest.java
Java
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
package com . crunchify . spring . tests ;
 
import org . springframework . context . ApplicationContext ;
import org . springframework . context . support . ClassPathXmlApplicationContext ;
 
import com . crunchify . spring . tutorials . CrunchifyPrintResult ;
 
/**
* @author Crunchify.com
*
*/
 
public class CrunchifyOrderTest {
 
@SuppressWarnings ( "resource" )
public static void main ( String [ ] args ) {
 
// Load Spring ApplicationContext file crunchify-beans.xml
ApplicationContext context = new ClassPathXmlApplicationContext ( "crunchify-beans.xml" ) ;
// get the bean which we specified in file crunchify-beans.xml file
CrunchifyPrintResult results = ( CrunchifyPrintResult ) context . getBean ( "orders" ) ;
// After loading each class - just print result
System . out . println ( results ) ;
}
}

Passaggio 10

Ora fai clic destro sul file CrunchifyOrderTest.java e Run As -> Java Application . Dovresti vedere il risultato stampato nell'ordine che abbiamo specificato Order.

Output
1
2
3
Class Name : CrunchifyGoogle1 - Result : Crunchify Google with Order - 1
Class Name : CrunchifyFacebook2 - Result : Crunchify Facebook with Order - 2
Class Name : CrunchifyYahoo3 - Result : Crunchify Yahoo with Order - 3

Esempio di annotazione dell'ordine di primavera di Crunchify