[Spring]Annotation-based container configuration_AnotationBasis_03 －－JSR 330 Standard Annotations

最新推荐文章于 2024-05-25 01:07:03 发布

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本文详细介绍了JSR330标准中的核心注解，包括@Inject、@Named和@Singleton的作用与用法，并提供了具体的代码示例。了解这些注解如何帮助实现依赖注入及组件的命名和作用域。

JSR 330 Standard Annotations

<dependency> <groupId>javax.inject</groupId> <artifactId>javax.inject</artifactId> <version>1</version>
</dependency>

由于这并不包含在javaspring框架中所以需要通过maven导入依赖

@Inject

类似于@Autowired

import javax.inject.Inject; public class SimpleMovieLister {
private MovieFinder movieFinder;
@Inject
public void setMovieFinder(MovieFinder movieFinder) { this.movieFinder = movieFinder;
}
public void listMovies() { this.movieFinder.findMovies(...); ...
} }

@Inject并没有required属性可以设置

@Named

同时具有@Qulifier和@Component的功能

import javax.inject.Inject; import javax.inject.Named;
public class SimpleMovieLister { private MovieFinder movieFinder;
@Inject
public void setMovieFinder(@Named("main") MovieFinder movieFinder) {
this.movieFinder = movieFinder; }
// ...
}

import javax.inject.Inject; import javax.inject.Named;
@Named("movieListener")
public class SimpleMovieLister { private MovieFinder movieFinder;
@Inject
public void setMovieFinder(MovieFinder movieFinder) { this.movieFinder = movieFinder;
}
// ...
}

@Singleton 类似于 @Scope("singleton"）