springboot自定义starter

1.引入依赖

<dependency>
    <groupId>org.springframework.bootgroupId>
    <artifactId>spring-boot-configuration-processorartifactId>
    <version>${spring-boot-version}version>
 	<optional>trueoptional>
dependency>

2.编写代码

2.1定义属性接收类

@ConfigurationProperties(prefix = "mvc.interceptor")
@Data
public class xxx{
	# pojo代码，接收yml中mvc.interceptor定义的值
	    private boolean show = true;
    	private String info;
}

2.2定制拦截器

实现HandlerInterceptor#preHandle，对yml中定义的ShowProperties属性类进行判断或逻辑检验

public class ShowInfoInterceptor implements HandlerInterceptor {

    @Autowired
    private ShowProperties showProperties;

    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
    
        if (showProperties.isShow()) {
            //拦截执行逻辑
            if (StringUtils.hasText(showProperties.getInfo())) {
                System.out.println(showProperties.getInfo());
            } else {
                System.out.println("Hello..");
            }
        }
        return true;
    }
}

2.3定义配置拦截器

实现WebMvcConfigurer#addInterceptors，把拦截器配上

@Configuration
public class WebConfig implements WebMvcConfigurer {


    @Bean
    public ShowProperties showProperties() {
        return new ShowProperties();
    }

    @Bean
    public ShowInfoInterceptor showInfoInterceptor() {
        return new ShowInfoInterceptor();
    }

    @Override
    public void addInterceptors(InterceptorRegistry registry) {
        registry.addInterceptor(showInfoInterceptor())
                .addPathPatterns("/**");
    }
}

2.4配置starter入口启动类

@ConditionalOnProperty(name = "mvc.interceptor.show", matchIfMissing = false)
@ComponentScan("com.ldl")
@Configuration
public class ShowInfoAutoConfig {
}

2.5配置启动器的入口

在resource下面新建META-INF/spring.factories
填入内容

org.springframework.boot.autoconfigure.EnableAutoConfiguration=\
        com.ldl.config.ShowInfoAutoConfig

3.使用starter

1.引入打包

 <dependency>
      <groupId>org.ldlgroupId>
      <artifactId>show-spring-boot-starterartifactId>
      <version>1.0-SNAPSHOTversion>
dependency>

2.yml中写入

mvc:
  interceptor:
    info: 1312312
    show: true

3.调用api，观察效果（狗头）