Spring Framework 4.3.4 Tutorial de anotação @Order – Ordem de classificação para um componente de bean anotado
Publicados: 2017-03-04Estrutura Web MVC – Spring é a melhor estrutura de controlador da Web e modelo de configuração para aplicativos corporativos de programação baseada em Java.
Temos mais de 40 tutoriais Spring MVC no Crunchify até agora. Neste tutorial, veremos @Order Annotation
. Qual é o uso de @Order na primavera? Aspectos de pedidos com Spring AOP
e MVC
.
Aqui estão os passos curtos:
- Vamos criar um Projeto Web Dinâmico
- Crie o arquivo de configuração do Spring
crunchify-bean.xml
- Converta-o para o projeto Maven
- Criar Beans com Anotação de Pedido
- Criar caso de teste e executar
Etapas detalhadas: vamos começar
Passo 1
- Ir para o Eclipse
- Clique em
File
- Clique em
New
- Clique em
Dynamic Web Project
Passo 2
- Forneça o nome do projeto:
CrunchifySpringMVC4OrderAnnotation
- Forneça o tempo de execução de destino. Principalmente a localização do Apache Tomcat no Eclipse.
- Escolha a versão do Dynamic Web Module:
3.1
Etapa 3
- Clique com o botão direito no projeto
- Clique em Configurar
- Converter projeto para projeto Maven
Passo 4
Escolha a configuração padrão e clique em Finish
.
Passo-5
Aqui está uma estrutura de projeto antes de começarmos.
Abra o arquivo pom.xml e adicione a dependência Spring MVC 4.3.4.
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< dependency > < groupId > org . springframework < / groupId > < artifactId > spring - context < / artifactId > < version > 4.3.4.RELEASE < / version > < / dependency > |
aqui está meu arquivo pom.xml
completo
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< 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 > |
Passo-6
- Clique com o botão direito em Recursos Java
- Clique em Novo
- Clique na pasta de origem e forneça o nome:
resources
Passo-7
Crie o arquivo crunchify-bean.xml
na pasta de recursos. Aqui está um conteúdo completo do arquivo.
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<? 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 > |
Passo-8
Agora vamos criar 5 arquivos com a anotação @Order
.
- Interface CrunchifyCompany.java
- CrunchifyGoogle1.java ==> Com
@Order(1)
- CrunchifyFacebook2.java ==> Com
@Order(2)
- CrunchifyYahoo3.java ==> Com
@Order(3)
- CrunchifyPrintResult.java
CrunchifyCompany.java
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package com . crunchify . spring . tutorials ; /** * @author Crunchify.com * */ public interface CrunchifyCompany { // do nothing here } |
CrunchifyGoogle1.java
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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
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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
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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
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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 ; } } |
Passo-9
Agora vamos criar o caso de teste CrunchifyOrderTest.java
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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 ) ; } } |
Passo-10
Agora é só clicar com o botão direito no arquivo CrunchifyOrderTest.java
e Run As
-> Java Application
. Você deve ver o resultado impresso na ordem que especificamos Ordem.
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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 |