5.springboot原理深入了解

自定义Starter：

1. 新建一个空项目

2. 在该项目中添加一个普通的maven模块

3. 再改项目中的依赖中添加：

   <dependency>
       <groupId>com.ariverh</groupId>
       <artifactId>ariverh-spring-boot-starter-autoconfigure</artifactId>
       <version>0.0.1-SNAPSHOT</version>
   </dependency>
   <dependency>
       <groupId>org.springframework.boot</groupId>
       <artifactId>spring-boot-configuration-processor</artifactId>
       <version>2.4.0</version>
   </dependency>
   

4. 再添加一个springboot模块

5. 再pom中只留下

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

6. 建立一下目录结构
   

7. 编写各类：

   public class Hello {
       private HelloProperties helloProperties;
   
       public HelloProperties getHelloProperties() {
           return helloProperties;
       }
   
       public void setHelloProperties(HelloProperties helloProperties) {
           this.helloProperties = helloProperties;
       }
   
       public String getHello(){
           return helloProperties.getPrefix()+"-hello-"+helloProperties.getSuffix();
       }
   }
   

   @ConfigurationProperties(prefix = "ariverh.hello")
   public class HelloProperties {
       private String prefix;
       private String suffix;
   
       public String getPrefix() {
           return prefix;
       }
   
       public void setPrefix(String prefix) {
           this.prefix = prefix;
       }
   
       public String getSuffix() {
           return suffix;
       }
   
       public void setSuffix(String suffix) {
           this.suffix = suffix;
       }
   }
   

   @Configuration
   @ConditionalOnWebApplication
   @EnableConfigurationProperties(HelloProperties.class)
   public class HelloAutoConfiguration {
       @Autowired
       HelloProperties helloProperties;
   
       @Bean
       public Hello hello(){
           Hello hello = new Hello();
           hello.setHelloProperties(helloProperties);
           return  hello;
       }
   }
   

   # Auto Configure
   org.springframework.boot.autoconfigure.EnableAutoConfiguration=\
   com.ariverh.mystarter.HelloAutoConfiguration
   

8. 打包这两个模块

9. 新建一个springboot项目

10. 导入启动器

    <dependency>
        <groupId>com.ariverh</groupId>
        <artifactId>ariverh-spring-boot-starter</artifactId>
        <version>1.0-SNAPSHOT</version>
    </dependency>
    

11. 编写测试

@RestController
@RequestMapping("/ariverh")
public class HelloController {
    @Autowired
    Hello hello;
    @RequestMapping("/hello")
    public String hello(){
        String hello = this.hello.getHello();
        return hello;
    }
}

12. 在application.properties中编写配置

    ariverh.hello.prefix=yyy
    ariverh.hello.suffix=sss
    

13. 测试