通过注解实现自定义SpringBootStarter自动装配

　　以Spring boot 作为微服务开发的项目中会用到很多第三方，或者自建的一些依赖SDK，例如 分布式锁、文件管理、数据库连接、统一错误拦截等组件。为了达到通用的目的，都会创建自定义的spring boot stater 组件。以下介绍创建步骤：
　　一、创建Maven测试项目test-starter pom文件如下： 	 		com.test.starter 		test-starter 		1.0.0 	 	4.0.0 	test-spring-boot-starter 	jar 	 		 			org.springframework.boot 			spring-boot-autoconfigure       2.3.2.RELEASE 		 	 	 		test-spring-boot-starter 	 
　　二、创建自动装配类TestServiceConfiguration.javapackage com.test.spring.boot.starter.config;  import org.springframework.beans.factory.annotation.Autowired; import org.springframework.boot.context.properties.EnableConfigurationProperties; import org.springframework.context.annotation.Bean; import org.springframework.context.annotation.Configuration;  import com.test.spring.boot.starter.TestService; import com.test.spring.boot.starter.TestServiceImpl;   @Configuration @EnableConfigurationProperties(value = TestServiceProperties.class) public class TestServiceConfiguration {          @Autowired         private TestServiceProperties properties;           @Bean         public TestService  getTestService() {           return new TestServiceImpl(properties);         } }
　　三、创建配置类TestServiceProperties.javapackage com.test.spring.boot.starter.config;  import org.springframework.boot.context.properties.ConfigurationProperties;  import lombok.Data; import lombok.ToString;  @Data @ToString @ConfigurationProperties(prefix = ＂test.starter＂) public class TestServiceProperties {          /**          * 客户端ID          */         private String clientId;          /**          * 客户端名称          */         private String clientName; }
　　四、创建提供服务的接口TestService.javapackage com.test.spring.boot.starter;  public interface TestService {        /**        * 测试        * @param name        * @return        */       String sayHello(String name); }
　　五、创建TestService的实现类型TestServiceImpl.javapackage com.test.spring.boot.starter;  import com.test.spring.boot.starter.config.TestServiceProperties;  /**  * 服务实现  * @author test  *  */ public class TestServiceImpl implements TestService {          private TestServiceProperties properties;          public TestServiceImpl(TestServiceProperties properties) {           this.properties = properties;         }          @Override         public String sayHello(String name) {           return ＂clientId: ＂+properties.getClientId()+＂,clientName: ＂                        +properties.getClientName()+＂,welcome ＂+name+＂!＂;         } }
　　六、创建自定义注解@EnableTestpackage com.test.spring.boot.starter.annotation;  import java.lang.annotation.Documented; import java.lang.annotation.ElementType; import java.lang.annotation.Retention; import java.lang.annotation.RetentionPolicy; import java.lang.annotation.Target;  import org.springframework.context.annotation.Import;  import com.test.spring.boot.starter.config.TestServiceConfiguration;  /**  * 自定义自动装配启动注解  * @author test  *  */ @Retention(RetentionPolicy.RUNTIME) @Target(ElementType.TYPE) @Documented @Import({TestServiceConfiguration.class}) public @interface EnableTest {  }
　　通过以上步骤就实现了自定义Spring boot starter test-spring-boot-starter 组件，下面创建测试项目去调用这个starter组件。
　　创建starter组件使用项目
　　一、创建maven测试项目test-service，pom文件如下 	 		com.test.starter 		test-starter 		1.0.0 	 	4.0.0 	test-service 	jar  	 		 			org.springframework.boot 			spring-boot-starter-web 		 		 			org.springframework.boot 			spring-boot-starter-test 			test 			 				 					org.junit.vintage 					junit-vintage-engine 				 			 		    		 		    com.test.starter 			test-spring-boot-starter 			1.0.0 		 	 	 		test-service 		 			 				org.springframework.boot 				spring-boot-maven-plugin 				${spring.boot.version} 				 					 						 							repackage 						 					 				 			 		 	 
　　二、创建启动类Application.javapackage com.test.service;   import org.springframework.boot.SpringApplication; import org.springframework.boot.autoconfigure.SpringBootApplication; import org.springframework.context.annotation.ComponentScan;  import com.test.spring.boot.starter.annotation.EnableTest;  @EnableTest    //启动自定义组件 @ComponentScan(basePackages = {  		＂com.test.service＂}) @SpringBootApplication public class Application {         public static void main(String[] args) {           SpringApplication.run(Application.class, args);          } }
　　三、创建配置文件application.ymltest:   starter:      client-id: test-service-01      client-name: test-service
　　四、创建测试类TestController.javapackage com.test.service.controller;  import javax.annotation.Resource;  import org.springframework.web.bind.annotation.GetMapping; import org.springframework.web.bind.annotation.PathVariable; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.RestController;  import com.test.spring.boot.starter.TestService;  @RestController @RequestMapping(＂/v1/test＂) public class TestController {            @Resource         private TestService testService;          @GetMapping(＂/{name}＂)         public String hello(@PathVariable(＂name＂)String name) {           return testService.sayHello(name);         } }
　　到这里整个自定义spring boot starter 创建就完成了，同时也依赖到项目中进行使用了。
　　项目代码：starter-test: 自定义starter组件