英文:
Dependency Injection of Singleton Class that extends from Interface
问题
我有一个名为ReadingStrategyImp的单例类，它继承自一个接口ReadingStrategy。在readingStrategyImp-getInstance()方法中，将返回ReadingStrategyImp类的实例。
以下是您的查询：
我想要在项目的几个其他类中注入ReadingStrategyImp的依赖关系。
我通过以下代码实现了这一点：
ReadingStrategy readingStrategy;
@Autowired
public void setReadingStrategy(ReadingStrategyImp readingStrategy) {
this.readingStrategy = ReadingStrategyImp.getInstance();
}
我想知道如何注入这个依赖关系。
英文:
I have a Singleton class ReadingStratgeyImp that extends from an Interface ReadingStrategy. In readingStrategyImp-getInstance() method will return the instance of ReadingStrategyImp.
Here is my query:
I want to inject the dependency of ReadingStrategyImp in a few of the other classes of the project.
I am achieving this by below code
ReadingStrategy readingStrategy;
@Autowired
public void setReadingStrategy(ReadingStrategyImp readingStrategy) {
this.readingStrategy = ReadingStrategyImp.getInstance();
}
I want to know how one will inject the dependency.
答案1
得分: 1
@Component
public class Sample {
// spring will automatically find the implementation class and inject it.
// so, the ReadingStrategyImp class will automatically injected.
@Autowired
@Qualifier("readingStrategyImp")
private ReadingStrategy readingStrategy;
}
That's all.
英文:
You simply do this :
@Component
public class Sample {
// spring will automatically find the implementation class and inject it.
// so, the ReadingStrategyImp class will automatically injected.
@Autowired
@Qualifier("readingStrategyImp")
private ReadingStrategy readingStrategy;
}
That's all.
答案2
得分: 0
如果我理解你的问题正确，你应该首先为ReadingStrategy创建一个名为ReadingStrategyImp的Bean：
@Bean
public ReadingStrategy readingStrategy() {
return ReadingStrategyImp.getInstance();
}
然后在需要的地方，你可以直接自动装配ReadingStrategy。
@Autowired
ReadingStrategy readingStrategy;
依赖于接口而不是具体类通常是更好的做法。
英文:
If I understand your question correct, you should create first a Bean for ReadingStrategy with ReadingStrategyImp:
@Bean
public ReadingStrategy readingStrategy() {
return ReadingStrategyImp.getInstance();
}
Then you could just autowire the ReadingStrategy where you need it.
@Autowired ReadingStrategy readingStrategy;
Its always better to depend on interfaces not on concrete classes.
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