Spring bean 没有从自定义库中自动连接

发布于 2025-01-10 07:53:07 字数 595 浏览 0 评论 0原文

我由自己的库（com.custom.mylib）创建，它返回如下所示的字符串。

@Component
public class MyLibrary{

    @Value("${str.message}")
    private String message; //This val should come from app which is going to use this lib
    public String readMessage() {
        return message;
    }

我已经创建了一个将使用上述库的项目。我已将 lib 作为 pom 依赖项包含在内。但是当我尝试从我的应用程序调用库方法时。我收到以下错误。如何解决呢？

   @Autowired
    private MyLibrary myLibrary;

考虑在您的配置。

我还在 application.properties 文件中添加了以下内容，以便库可以获取该值

str.message=Hello world

原文

I have created by own library(com.custom.mylib) which returns a string like below.

@Component
public class MyLibrary{

    @Value("${str.message}")
    private String message; //This val should come from app which is going to use this lib
    public String readMessage() {
        return message;
    }

I have create a project which is going to use above library. I have included the lib as pom dependency .But when I try to call library method from my app. I get the error below.
How to resolve it?

   @Autowired
    private MyLibrary myLibrary;

Consider defining a bean of type 'com.custom.mylog.MyLibrary' in your
configuration.

I also have below in application.properties file so that library can pick the value up

str.message=Hello world

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心头的小情儿 2025-01-17 07:53:07

我似乎得到了解决方案。我需要创建 META-INF 文件并执行 org.springframework.boot.autoconfigure.EnableAutoConfiguration=

如此处给出的
Spring Boot：从库项目自动装配 bean

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寒江雪… 2025-01-17 07:53:07

由于它必须用作外部库，因此您可以通过 @Configuration 文件实例化它：

@Configuration
public class AppConfiguration {

    @Bean
    public MyLibrary createMyLibraryInstance() {
        return new MyLibrary();
    }
}

我使用的规则如下（这不是通用规则）：

在您的域类中（Controller , Service) ：在构造函数中使用 @Autowired 。这是注入依赖项的推荐方法。
您想要使用外部类：使用 @Configuration 注释实现 Java 配置，以将外部类实例化为 bean。
您想要创建自定义实用程序类：用 @Component 装饰它。
当您有多个实现时，请使用 @Qualifier 并在 @Configuration 类中定义您的 bean。

As it has to be used as a external library, you can instantiate it throught a @Configuration file:

@Configuration
public class AppConfiguration {

    @Bean
    public MyLibrary createMyLibraryInstance() {
        return new MyLibrary();
    }
}

The rule I used is the follow (this is not an universal rule):

In your domain classes (Controller, Service) : use @Autowired in your constructor. It is the recommanded way to inject your dependencies.
You want to use external classes : implements a Java Configuration with @Configuration annotation, to instanciate your external classes as beans.
You want to create custom utilities classes : decorate it with @Component.
When you have more than on implementation, use @Qualifier and define your beans in a @Configuration class.

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