使用new关键字创建的Spring bean(@Component)中的自动装配

Question

我有两个春豆如下:

@Component("A")
@Scope("prototype")
public class A extends TimerTask {

    @Autowired
    private CampaignDao campaignDao;
    @Autowired
    private CampaignManager campManger;
    A(){
        init_A();
       }
    }

由于遗留代码,我必须用新关键字创建A的新对象

@Component("B")
@Scope("prototype")
public class B{
     public void test(){
       A a = new A();
     }
}

当运行 - >类A中的spring bean为null时,我可以创建一个Spring bean A的新实例并仍在其中使用自动装配吗？

Answer 1

您的组件"A"不是由Spring容器创建的,因此不会注入依赖项.但是,如果您需要支持一些遗留代码(我从您的问题中理解),您可以使用@Configurable注释和构建/编译时间编织:

@Configurable(autowire = Autowire.BY_TYPE)
public class A extends TimerTask {
  // (...)
}

然后,Spring将向组件A注入自动连接的依赖项,无论它是否由容器本身实例化,或者它是否在某些遗留代码中实例化new.

例如,要使用maven插件设置构建时编织,您必须:

1. 添加<context:spring-configured/>到Spring应用程序上下文
2. 配置Maven AspectJ插件:

在构建插件部分:

<build>
  <plugins>
    <plugin>
      <groupId>org.codehaus.mojo</groupId>
      <artifactId>aspectj-maven-plugin</artifactId>
      <version>1.4</version>
      <configuration>
        <complianceLevel>1.6</complianceLevel>
        <encoding>UTF-8</encoding>
        <aspectLibraries>
          <aspectLibrary>
            <groupId>org.springframework</groupId>
            <artifactId>spring-aspects</artifactId>
          </aspectLibrary>
        </aspectLibraries>
        <!-- 
          Xlint set to warning alleviate some issues, such as SPR-6819. 
          Please consider it as optional.
          https://jira.springsource.org/browse/SPR-6819
        -->
        <Xlint>warning</Xlint>
      </configuration>
      <executions>
        <execution>
          <goals>
            <goal>compile</goal>
            <goal>test-compile</goal>
          </goals>
        </execution>
      </executions>
    </plugin>
  </plugins>
</build>

...和依赖项部分:

<dependency>
  <groupId>org.springframework</groupId>
  <artifactId>spring-aspects</artifactId>
  <version>3.1.1.RELEASE</version>
</dependency>
<dependency>
  <groupId>org.aspectj</groupId>
  <artifactId>aspectjrt</artifactId>
  <version>1.6.11</version>
</dependency>

有关详细信息,请参阅Spring参考:http: //static.springsource.org/spring/docs/current/spring-framework-reference/html/aop.html#aop-atconfigurable