工程简介

• 自定义Spring boot starter

1、创建自定义starter项目

• starter-provider，此项目负责封装成自定义starter的jar包，提供给其他项目引用

1.1、添加maven依赖

    <modelVersion>4.0.0</modelVersion>
    <groupId>com.yubest</groupId>
    <artifactId>version-spring-boot-starter</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>version-spring-boot-starter</name>
    <description>Demo project for Spring Boot</description>
    
     <dependencies>
             <dependency>
                 <groupId>org.springframework.boot</groupId>
                 <artifactId>spring-boot-starter</artifactId>
             </dependency>
             <dependency>
                 <groupId>org.springframework.boot</groupId>
                 <artifactId>spring-boot-autoconfigure</artifactId>
             </dependency>
             <dependency>
                 <groupId>org.springframework.boot</groupId>
                 <artifactId>spring-boot-configuration-processor</artifactId>
                 <optional>true</optional>
             </dependency>
     </dependencies>

1.2、添加功能代码

//测试用的需要注入的bean
public class Version {

    private String version;

    private String desc;

    public String getVersion() {
        return version;
    }

    public void setVersion(String version) {
        this.version = version;
    }

    public String getDesc() {
        return desc;
    }

    public void setDesc(String desc) {
        this.desc = desc;
    }

    public String getInfo() {
        return "Version {version=" + getVersion() + ", desc=" + getDesc() + "}";
    }
}

//配置信息
@ConfigurationProperties(prefix = "yubest.version")
public class VersionProperties {

    private String version;

    private String desc;

    public String getVersion() {
        return version;
    }

    public void setVersion(String version) {
        this.version = version;
    }

    public String getDesc() {
        return desc;
    }

    public void setDesc(String desc) {
        this.desc = desc;
    }
}

//自动装配
@Configuration
@EnableConfigurationProperties(VersionProperties.class)
public class VersionAutoConfiguration {

    @Bean
    public Version version(VersionProperties prop) {
        Version version = new Version();
        version.setVersion(prop.getVersion());
        version.setDesc(prop.getDesc());
        return version;
    }
}

1.3、添加自动装配入口类

• 在META-INF目录下添加spring.factories文件，内容为：

org.springframework.boot.autoconfigure.EnableAutoConfiguration=\
com.yubest.provider.config.VersionAutoConfiguration

或者通过自定义enable注解的方式：

//自定义的自动装配注解
@Retention(RetentionPolicy.RUNTIME)
@Target({ElementType.TYPE})
@Documented
@Import({VersionConfigurationSelector.class})
public @interface EnableVersion {
}

//依赖注入的选择器
public class VersionConfigurationSelector implements ImportSelector {

    public String[] selectImports(AnnotationMetadata importingClassMetadata) {
        return new String[]{VersionAutoConfiguration.class.getName()};
    }
}

• 两种方式，选择其一即可

2、创建自定义starter的引用项目

• starter-consumer 是独立的项目，引用 starter-provider 的功能

2.1、添加maven依赖

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

        <dependency>
            <groupId>com.yubest</groupId>
            <artifactId>version-spring-boot-starter</artifactId>
            <version>0.0.1-SNAPSHOT</version>
        </dependency>

2.2、application.properties中添加配置

yubest.version.version=v1.0.0
yubest.version.desc=添加了自定义starter功能

2.3、添加测试代码

@RestController
public class DemoController {

    @Autowired
    private Version version;

    @GetMapping(value = "/getConfig")
    public Object getConfig() {
        return version.getInfo();
    }
}

@EnableVersion
@SpringBootApplication
public class StarterConsumerApplication {

    public static void main(String[] args) {
        SpringApplication.run(StarterConsumerApplication.class, args);
    }

}

2.4、结果

请求：
curl -X GET \
  http://localhost:8080/getConfig

返回：
Version {version=v1.0.0, desc=添加了自定义starter功能}

• 仓库：https://gitee.com/hweiyu/spring-boot-custom-starter