使用new关键字创建的Spring bean(@Component)中的自动装配 [英] Autowiring in Spring bean (@Component) created with new keyword
问题描述
我有两个spring bean,如下所示:
I have two spring beans as follows:
@Component("A")
@Scope("prototype")
public class A extends TimerTask {
@Autowired
private CampaignDao campaignDao;
@Autowired
private CampaignManager campManger;
A(){
init_A();
}
}
我必须用新的A创建一个新对象关键字,由于遗留代码
I have to make a new object of A with new keyword, due to a legacy code
@Component("B")
@Scope("prototype")
public class B{
public void test(){
A a = new A();
}
}
运行时 - > A类中的spring bean是空的,我可以创建一个新的spring bean A的实例,还是使用自动装配?
when Running -> the spring beans in the class A are null, can i create a new instance of the spring bean A and still use autowiring in it ?
推荐答案
你的组件A 不是由Spring容器创建的,因此依赖关系不会被注入。但是,如果您需要支持一些遗留代码(从您的问题可以看出),您可以使用 @Configurable
注释和构建/编译时编织:
Yours component "A" is not created by Spring container, thus, dependencies are not injected. However, if you need to support some legacy code (as I understand from your question), you can use @Configurable
annotation and build/compile time weaving:
@Configurable(autowire = Autowire.BY_TYPE)
public class A extends TimerTask {
// (...)
}
然后,Spring将注入自动连线依赖关系到组件A,无论是否被实例化容器本身,或者如果它是通过新的
实例化的。
Then, Spring will inject autowired dependencies to component A, no matter if it's instantiated by container itself, or if it's instantiated in some legacy code by new
.
例如,要设置build-时间编织与maven插件你必须:
For example, to set up build-time weaving with maven plugin you have to:
- 添加
< context:spring-configured />
到Spring应用程序上下文 - 配置 Maven AspectJ插件< a>:
- Add
<context:spring-configured/>
to the Spring application context - Configure Maven AspectJ plugin:
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:
<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
Please consult Spring reference for more details: http://static.springsource.org/spring/docs/current/spring-framework-reference/html/aop.html#aop-atconfigurable
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