我想使用JSR330 (@Inject,@Singleton,.)。因此,由于spring是常用的,所以我希望使用spring作为底层实现。但我不明白是否可以用:
我尝试了以下方法,但没有成功:
package org.di.spring;
import org.springframework.context.ApplicationContext;
import org.springframework.context.annotation.AnnotationConfigApplicationContext;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;
import org.tomerbd.snippets.nlp.OpenNLP;
import javax.inject.Inject;
// A failed attempt to achieve: DI + JSR330 + Spring + NoSpring Specific Annotations + No XML
// I didn't want to have any spring annotations but it looks like I have to, wanted to be pure JSR330.
@Configuration
@ComponentScan
public class DIJSR330NoXML {
public static class UseMe {
public String getMe() { return "here I am"; }
}
public static class IWillUseYou {
@Inject private UseMe useMe;
public String letsUseHim() {
return useMe.getMe();
}
}
public static void main(String[] args) throws Exception {
ApplicationContext ctx = new AnnotationConfigApplicationContext("org.di.spring");
((AnnotationConfigApplicationContext) ctx).refresh();
IWillUseYou user = ctx.getBean(IWillUseYou.class); // any other way to get class? I don't want to use spring annotations only jsr330 please with spring as impl!
System.out.println(user.letsUseHim());
}
}输出失败:
20:25:38.509 [main] DEBUG org.springframework.beans.factory.support.DefaultListableBeanFactory - Eagerly caching bean 'DIJSR330NoXML' to allow for resolving potential circular references
20:25:38.564 [main] DEBUG org.springframework.beans.factory.support.DefaultListableBeanFactory - Finished creating instance of bean 'DIJSR330NoXML'
20:25:38.566 [main] DEBUG org.springframework.beans.factory.support.DefaultListableBeanFactory - Returning cached instance of singleton bean 'org.springframework.context.event.internalEventListenerFactory'
20:25:38.794 [main] DEBUG org.springframework.context.annotation.AnnotationConfigApplicationContext - Unable to locate LifecycleProcessor with name 'lifecycleProcessor': using default [org.springframework.context.support.DefaultLifecycleProcessor@51c693d]
20:25:38.805 [main] DEBUG org.springframework.beans.factory.support.DefaultListableBeanFactory - Returning cached instance of singleton bean 'lifecycleProcessor'
20:25:38.813 [main] DEBUG org.springframework.core.env.PropertySourcesPropertyResolver - Could not find key 'spring.liveBeansView.mbeanDomain' in any property source
Exception in thread "main" org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type 'org.di.spring.DIJSR330NoXML$IWillUseYou' available
at org.springframework.beans.factory.support.DefaultListableBeanFactory.getBean(DefaultListableBeanFactory.java:347)
at org.springframework.beans.factory.support.DefaultListableBeanFactory.getBean(DefaultListableBeanFactory.java:334)
at org.springframework.context.support.AbstractApplicationContext.getBean(AbstractApplicationContext.java:1107)
at org.di.spring.DIJSR330NoXML.main(DIJSR330NoXML.java:31)
Process finished with exit code 1因此,如果JSR330提供了DI和spring支持JSR330,那么是否可以只使用,只使用 JSR 330注释,而不使用Spring呢?
如果这是不可能的,那么您能否告诉我,我需要使用哪一组最小的spring注释(请不要使用xml )才能正常工作。
发布于 2018-07-26 17:37:32
来自javax.inject的所有注释(包括这些命名注释)都被理解为JSR330,它只是一个API,即一个提供接口的应用程序接口,而没有任何实现。
这意味着使用这些注释,因为它不会触发任何效果,因为没有类、容器,也没有监视这些注释在哪里使用的任何内容。Java和Java都没有提供任何IoC (反转控制)容器。您必须包括这些实现框架- Spring就是一个很好的例子。
看看前男友。JBoss焊。配置此实现和其他实现的方式(注释、XML,任何不同的东西)都是单独的。
https://stackoverflow.com/questions/51544449
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