自定义springboot-starter

一、 编写starter

二、编写测试类

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新建springboot项目，删掉测试文件，pom里，只保留3个（自动配置，自动配置处理用来在yml提示），去掉build章节

 <dependencies>
        <dependency>
            <groupId>org.springframework.bootgroupId>
            <artifactId>spring-boot-starterartifactId>
        dependency>
        <dependency>
            <groupId>org.springframework.bootgroupId>
            <artifactId>spring-boot-autoconfigureartifactId>

        dependency>

        <dependency>
            <groupId>org.springframework.bootgroupId>
            <artifactId>spring-boot-configuration-processorartifactId>
        dependency>

    dependencies>

编写HelloProperties，前缀用大小写易出异常。注意大小写。

@ConfigurationProperties(prefix = "hello")
public class HelloProperties {
    private String name = "anon";
    private String address = "unname address";

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getAddress() {
        return address;
    }

    public void setAddress(String address) {
        this.address = address;
    }

    @Override
    public String toString() {
        return "HelloProperties{" +
                "name='" + name + '\'' +
                ", address='" + address + '\'' +
                '}';
    }
}

编写自动配置类HelloServiceAutoConfiguration,

注解导入上一个配置文件，注意构造器注入属性

@Configuration
@EnableConfigurationProperties(HelloProperties.class)
public class HelloServiceAutoConfiguration {

   private HelloProperties helloProperties;

    public HelloServiceAutoConfiguration(HelloProperties helloProperties) {
        this.helloProperties = helloProperties;
    }

    @Bean
    @ConditionalOnMissingBean
    public HelloService helloService(){
        return  new HelloService(helloProperties.getName(),helloProperties.getAddress());
    }
}

编写业务方法HelloService，注意构造器

public class HelloService {

    private String  name;
    private String address;

    public HelloService(String name, String address) {
        this.name = name;
        this.address = address;
    }

    public String sayHello(){
        return "你好，我i是"+name+"，来自"+address;
    }
}

在resources里，建立META-INF/spring.factories 文件，让springboot自动扫描启动类

org.springframework.boot.autoconfigure.EnableAutoConfiguration=\
  cn.taotao.config.HelloServiceAutoConfiguration

然后maven install到本地仓库，安装完毕后，进idea，更新一下本地仓库，不必更新远程仓库。否则再下一步中，不识别新安装的starter

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建立测试文件 ，新建工程demo

在pom中引入刚才的starter坐标。

  <dependency>
            <groupId>cn.taotaogroupId>
            <artifactId>demoStartartifactId>
            <version>0.0.1-SNAPSHOTversion>
  dependency>

新建测试类

    @Autowired
    private HelloService helloService;

    @Test
    void hello(){
        System.out.println("helloService.sayHello() = " + helloService.sayHello());
    }

可以在application.yml 中测试注入的值