在 Spring 的 Java 配置中自动装配 bean
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Autowire a bean within Spring's Java configuration
提问by Avanst
Is it possible to use Spring's @Autowiredannotation within a Spring configuration written in Java?
是否可以在用@AutowiredJava 编写的 Spring 配置中使用 Spring 的注释？
For example:
例如：
@Configuration
public class SpringConfiguration{
@Autowired
DataSource datasource;
@Bean
public DataSource dataSource(){
return new dataSource();
}
// ...
}
Obviously a DataSource interface cannot be directly instantiated but I directly instantiated it here for simplification. Currently, when I try the above, the datasource object remains null and is not autowired by Spring.
很明显，一个DataSource接口不能直接实例化，为了简化，我这里直接实例化了。目前，当我尝试上述操作时，数据源对象保持为 null，并且不会由 Spring 自动装配。
I got @Autowiredto work successfully with a Hibernate SessionFactoryobject by returning a FactoryBean<SessionFactory>.
我@Autowired用一个Hibernate成功运行SessionFactory对象通过返回FactoryBean<SessionFactory>。
So my question specifically: is there a way to do that with respect to a DataSource? Or more generally, what is the method to autowire a bean within a Spring Java Configuration?
所以我的问题是：有没有办法对 a 做到这一点DataSource？或者更一般地说，在 Spring Java 配置中自动装配 bean 的方法是什么？
I should note I am using Spring version 3.2.
我应该注意到我使用的是 Spring 3.2 版。
采纳答案by Sotirios Delimanolis
If you need a reference to the DataSourcebean within the same @Configurationfile, just invoke the bean method.
如果您需要DataSource在同一@Configuration文件中引用 bean，只需调用 bean 方法。
@Bean
public OtherBean someOtherBean() {
return new OtherBean(dataSource());
}
or have it autowired into the @Beanmethod
或者让它自动连接到@Bean方法中
@Bean
public OtherBean someOtherBean(DataSource dataSource) {
return new OtherBean(dataSource);
}
The lifecycle of a @Configurationclass sometimes prevents autowiring like you are suggesting.
@Configuration类的生命周期有时会像您建议的那样阻止自动装配。
回答by javahuang
maybe you can use constructor to inject some bean from other configuration file to your configuration，while @Autowired may not work correct in the configuration file
也许您可以使用构造函数将其他配置文件中的一些 bean 注入您的配置，而 @Autowired 在配置文件中可能无法正常工作
@Configuration
public class AppConfig {
private DataSource dataSource;
public AppConfig(DataSource dataSource) {
this.dataSource = dataSource;
}
@Bean
public OtherBean otherBean(){
return new OtherBean(dataSource);
}
}
回答by Shruthi H R
beans configured with @Configuration class can't be autowired ,
用@Configuration 类配置的 bean 不能自动装配，
So you cannot use @Autowiring and @configuration together
所以你不能同时使用@Autowiring 和@configuration
回答by tkruse
For completeness sake: Yes it is technically possible to use @Autowired annotation in spring @Configuration classes, and it works the same way as for other spring beans. But the accepted answer shows how the original problem should be solved.
为了完整起见：是的，技术上可以在 spring @Configuration 类中使用 @Autowired 注释，它的工作方式与其他 spring bean 相同。但是接受的答案显示了应该如何解决原始问题。
