spring boot 自定义starter示例

以下是一个简单的Spring Boot自定义Starter的示例。

1. 创建一个新的Maven项目作为Starter：

<groupId>com.example</groupId>
<artifactId>my-custom-spring-boot-starter</artifactId>
<version>1.0.0-SNAPSHOT</version>
<packaging>jar</packaging>
 
<dependencies>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter</artifactId>
    </dependency>
</dependencies>

2. 创建一个配置属性类：

package com.example.config;
 
import org.springframework.boot.context.properties.ConfigurationProperties;
 
@ConfigurationProperties(prefix = "custom.starter")
public class CustomStarterProperties {
    private String message;
 
    public String getMessage() {
        return message;
    }
 
    public void setMessage(String message) {
        this.message = message;
    }
}

3. 创建自动配置类：

package com.example.autoconfigure;
 
import com.example.config.CustomStarterProperties;
import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
import org.springframework.boot.context.properties.EnableConfigurationProperties;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
 
@Configuration
@EnableConfigurationProperties(CustomStarterProperties.class)
@EnableAutoConfiguration
public class CustomStarterAutoConfiguration {
 
    private final CustomStarterProperties properties;
 
    public CustomStarterAutoConfiguration(CustomStarterProperties properties) {
        this.properties = properties;
    }
 
    @Bean
    public CustomStarterService customStarterService() {
        return new CustomStarterService(properties.getMessage());
    }
}

4. 创建服务类：

package com.example;
 
public class CustomStarterService {
    private String message;
 
    public CustomStarterService(String message) {
        this.message = message;
    }
 
    public String getMessage() {
        return message;
    }
}

5. 在resources目录下创建META-INF文件夹，并在其中创建spring.factories文件：

org.springframework.boot.autoconfigure.EnableAutoConfiguration=com.example.autoconfigure.CustomStarterAutoConfiguration

这样一个简单的自定义Spring Boot Starter就完成了。可以将这个项目打包成JAR，并在其他Spring Boot项目中通过Maven或Gradle引用，使用@EnableAutoConfiguration注解来启用自动配置。