自定义starter

简介

将自己服务继承到spring容器中。

步骤

• 增加依赖包

  <dependency>
      <groupId>org.springframework.boot</groupId>
      <artifactId>spring-boot-starter</artifactId>
   </dependency>
   <dependency>
       <groupId>org.springframework.boot</groupId>
       <artifactId>spring-boot-configuration-processor</artifactId>
       <optional>true</optional>
    </dependency>
  

• 配置映射类

  import org.springframework.boot.context.properties.ConfigurationProperties;
  /**
   * @Description
   * @Author luochaoqun
   * @Date 2020-08-24 08:20
   **/
   @ConfigurationProperties(prefix = "demo")
   public class DemoProperties {
      private String sayWhat;
      private String toWho;
      public String getSayWhat() {
         return sayWhat;
      }
    public void setSayWhat(String sayWhat) {
        this.sayWhat = sayWhat;
    }
    public String getToWho() {
        return toWho;
    }
    public void setToWho(String toWho) {
        this.toWho = toWho;
    }
  

}

- 读取配置。ConditionOnProperty会根据条件决定是否加载，这里会判断配置中isopen是否为true，如果为true才会去读取前缀为 
 demo的配置。定义想要集成到容器的bea。

import com.luochaoqun.ideas.frame.redis.starter.service.DemoService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.autoconfigure.condition.ConditionalOnProperty;
import org.springframework.boot.context.properties.EnableConfigurationProperties;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

/**

• @Description

• @Author luochaoqun

• @Date 2020-08-24 08:26
  **/
  @Configuration
  @EnableConfigurationProperties(DemoProperties.class)
  @ConditionalOnProperty(prefix = "demo", name = "isopen", havingValue = "true")
  public class DemoConfig {

  @Autowired
  private DemoProperties demoProperties;

  @Bean
  public DemoService demoService() {
  return new DemoService(demoProperties.getSayWhat(), demoProperties.getToWho());
  }
  }

- 定义加载项，在resource下增加META-INFO文件夹，并增加spring.factories文件，项目启动的时候会去加载指定的类。

  ## starter 自动装配

org.springframework.boot.autoconfigure.EnableAutoConfiguration=com.luochaoqun.ideas.frame.redis.starter.config.DemoConfig

- 使用：引入自定义starter，然后通过@Resource引入依赖的Bean就可以调用了