生活中的Design.

SpringFrameWork

Spring
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2019/12/11 Share

SpringFrameWork

IoC container

  • BeanFactory
    • ApplicationContext

初始化IoC Container

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ApplicationContext context = new ClassPathXmlApplicationContext("services.xml", "daos.xml");

获取Beans

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  // create and configure beans
ApplicationContext context = new ClassPathXmlApplicationContext("services.xml", "daos.xml");

// retrieve configured instance
PetStoreService service = context.getBean("petStore", PetStoreService.class);

// use configured instance
List<String> userList = service.getUsernameList();

如果是Groovy定义的

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ApplicationContext context = new GenericGroovyApplicationContext("services.groovy", "daos.groovy");

Way of DI (Dependencies Injection)

  • XML configuration

    属性name元素引用JavaBean属性的名称，ref元素引用另一个bean定义的名称。
    id属性是一个字符串，用于标识单个bean定义。 class属性定义bean的类型并使用完全限定的classname

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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"
        xsi:schemaLocation="http://www.springframework.org/schema/beans/http://www.springframework.org/schema/beans/spring-beans.xsd">
            <!-- id属性是一个字符串，用于标识单个bean定义的变量名。 class属性定义bean的类型并使用完全限定的classname-->
      <bean id="petStore"
       class="org.springframework.samples.jpetstore.services.PetStoreServiceImpl">
          <property name="accountDao" ref="accountDao"/>
          <property name="itemDao" ref="itemDao"/>
          <!-- additional collaborators and configuration for this bean go here -->
      </bean>
      <bean id="accountDao"
          class="org.springframework.samples.jpetstore.dao.jpa.JpaAccountDao">
          <!-- additional collaborators and configuration for this bean go here -->
      </bean>

      <bean id="itemDao" class="org.springframework.samples.jpetstore.dao.jpa.JpaItemDao">
          <!-- additional collaborators and configuration for this bean go here -->
      </bean>
    </beans>

    指定工厂方法来生成实例

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    <bean id="clientService"
      class="examples.ClientService"
      factory-method="createInstance"/>
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    public class ClientService {
       private static ClientService clientService = new ClientService();
       private ClientService() {}

       public static ClientService createInstance() {
           return clientService;
       }
    }

  • Groovy bean definition DSL

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    beans {
        dataSource(BasicDataSource) {
            driverClassName = "org.hsqldb.jdbcDriver"
            url = "jdbc:hsqldb:mem:grailsDB"
            username = "sa"
            password = ""
            settings = [mynew:"setting"]
        }
        sessionFactory(SessionFactory) {
            dataSource = dataSource
        }
        myService(MyService) {
            nestedBean = { AnotherBean bean ->
                dataSource = dataSource
            }
        }
    }

  • Annotation-based configuration

  • Java-based configuration

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    @Configuration
    public class AppConfig {

      @Bean
      public TransferServiceImpl transferService() {
        return new TransferServiceImpl();
      }
    }

    效果等同于

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    <beans>
      <bean id="transferService" class="com.acme.TransferServiceImpl"/>
    </beans>

Bean属性

Property Explained in…​
class Instantiating beans
name Naming beans
scope Bean scopes
constructor arguments Dependency Injection
properties Dependency Injection
autowiring mode Autowiring collaborators
lazy-initialization mode Lazy-initialized beans
initialization method Initialization callbacks
destruction method Destruction callbacks

原文作者：Apm29

原文链接：https://apm29.github.io/2019/12/11/Spring/

发表日期：December 11th 2019, 9:11:20 pm

更新日期：December 18th 2019, 4:51:02 pm

版权声明：本文采用知识共享署名-非商业性使用 4.0 国际许可协议进行许可

CATALOG
  1. 1. SpringFrameWork
    1. 1.1. IoC container
      1. 1.1.1. Way of DI (Dependencies Injection)
    2. 1.2. Bean属性
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