注入和资源和自动连线注释 [英] Inject and Resource and Autowired annotations

问题描述

@Inject 和 @Resource 和 @Autowired 注释？

我们什么时候应该使用它们？

When should we use each of them?

推荐答案

@Inject与@Autowire与@Resource之间的区别？

The difference between @Inject vs. @Autowire vs. @Resource?

@Autowired：弹簧适当注释（而不是@Inject和@Resource），通过类型注入资源，即由注释字段或承包商的接口的类。如果我们几乎没有实现接口或子类，我们可以使用@Qualifier注释来缩小选择范围，以避免歧义。对于回退匹配，bean名称被认为是默认限定符值。虽然你可以使用这个惯例通过名字来引用特定的bean，但是@Autowired基本上是关于类型驱动的注入和可选语义限定词。

@Autowired: spring propriety annotation (as opposed to @Inject and @Resource) that inject a resource by-type, i.e. by the class of by the interface of the annotated field or contractor. In case we have few implementation of an interface or a subclass we can narrow down the selection using the @Qualifier annotation to avoid ambiguity. For a fallback match, the bean name is considered a default qualifier value. Although you can use this convention to refer to specific beans by name, @Autowired is fundamentally about type-driven injection with optional semantic qualifiers.

@Inject： / strong>基于JSR-330（针对Java的依赖注入）的注释识别可注入的构造函数，方法和字段。此注释是Spring的@Autowired注释几乎完全可以替代。所以，不用使用Spring特定的@Autowired注释，你可以选择使用@Inject。 @Autowired和@Inject之间的一个区别是@Inject没有必需的字段，以防万一我们找不到一个合适的对象来注入它将失败，而@Autowired可以使用required = false并允许null的能力字段如果需要！）。
@Inject注释的优点是，而不是直接注入引用，您可以要求@Inject注入提供程序。提供程序接口允许懒惰地注入bean引用和注入一个bean的多个实例。
如果我们几乎没有实现接口或子类，我们可以使用@Named注释来缩小选择范围，以避免歧义。 @Named注释非常像基于JSR-250的Spring的@Qualifier

@Inject: Annotation based on JSR-330 (Dependency Injection for Java) identifies injectable constructors, methods, and fields. This annotation is an almost complete drop-in replacement for Spring’s @Autowired annotation. So, instead of using the Spring-specific @Autowired annotation, you might choose to use @Inject. One of the differences between @Autowired and @Inject is that @Inject does not have the required field so in case we fail to find a suitable object to inject it will fail while @Autowired can used required=false and allow null able field (only if required!). Advantage of @Inject annotation is that rather than inject a reference directly, you could ask @Inject to inject a Provider. The Provider interface enables, among other things, lazy injection of bean references and injection of multiple instances of a bean. In case we have few implementation of an interface or a subclass we can narrow down the selection using the @Named annotation to avoid ambiguity. @Named annotation works much like Spring’s @Qualifier

@Resource：注释。 @Resource与@Autowired和@Inject非常相似，但主要的区别是为了找出需要注入的bean而执行的路径。 @Resource将首先按名称缩小搜索范围，然后按类型缩小搜索范围，最后按限定符缩小搜索范围（如果按名称找到匹配项则忽略）。 @Autowired和@Inject将首先按类型缩小搜索范围，然后按限定符缩小搜索范围，最后按名称缩小搜索范围。

@Resource: annotation based on JSR-250. @Resource is quite similar to @Autowired and @Inject, but the main difference is the execution paths taken to find out the required bean to inject. @Resource will narrow down the search first by name then by type and finally by Qualifiers (ignored if match is found by name). @Autowired and @Inject will narrow down the search first by type then by qualifier and finally by the name.

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