springboot框架学习积累---SpringBoot自定义starter

springboot框架学习积累—SpringBoot自定义starter

1. SpringBoot的starter机制

2. 自定义starter 的原因

3. 自定义starter的命名规范

4. 自定义starter的步骤

1. 新建maven jar工程，工程名是zdy-spring-boot-starter，导入自动配置的依赖

   <dependencies> 
   	<dependency> 
   		<groupId>org.springframework.boot</groupId> 
   		<artifactId>spring-boot-autoconfigure</artifactId> 
   		<version>2.2.2.RELEASE</version>
   	</dependency>
   </dependencies>
   

2. 编写javaBean

   @EnableConfigurationProperties(SimpleBean.class)   //开启@ConfigurationProperties注解
   @ConfigurationProperties(prefix = "simplebean")
   public class SimpleBean {
   
       private int id;
       private String name;
   
       public int getId() {
           return id;
       }
   
       public void setId(int id) {
           this.id = id;
       }
   
       public String getName() {
           return name;
       }
   
       public void setName(String name) {
           this.name = name;
       }
   
       @Override
       public String toString() {
           return "SimpleBean{" +
                   "id=" + id +
                   ", name='" + name + '\'' +
                   '}';
       }
   
   }
   

3. 编写配置类MyAutoConfiguration,让springboot完成自动配置的配置类

   @Configuration
   @ConditionalOnClass  //当类路径classpath下有指定的类的情况下，就会进行自动装配
   public class MyAutoConfiguration {
   
       static {
           System.out.println("MyAutoConfiguration init....");
       }
   
       @Bean
       public SimpleBean simpleBean() {
   
           return new SimpleBean();
       }
   }
   

4. resources下创建/META-INF/spring.factories

   #表示要自动配置的类
   org.springframework.boot.autoconfigure.EnableAutoConfiguration=\
   com.lagou.config.MyAutoConfiguration    #类路径