Spring Boot 自定义配置key @ConfigurationProperties(prefix = "db.clickhouse")

 spring.application.name=springbootdemo
 server.port=8080
 mail.username=application-duan
 mail.password=application-duan123456
 

 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.beans.factory.annotation.Value;
 import org.springframework.context.annotation.PropertySource;
 import org.springframework.web.bind.annotation.RequestMapping;
 import org.springframework.web.bind.annotation.RestController;
 @RestController
 @RequestMapping("/task")
 public class TaskController {
     @Value("${mail.username}")
     private String userName;
 

     @Value("${mail.password}")
     private String password;
     @RequestMapping(value = { "/", "" })
     public String hellTask() {
         System.out.println("userName:" + userName);
         System.out.println("password:" + password);
         return "hello task !!";
     }
 }
 

 userName:application-duan
 password:application-duan123456
 

 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.beans.factory.annotation.Value;
 import org.springframework.context.annotation.PropertySource;
 import org.springframework.web.bind.annotation.RequestMapping;
 import org.springframework.web.bind.annotation.RestController;
 @RestController
 @RequestMapping("/task")
 @PropertySource("classpath:mail.properties")
 public class TaskController {
     @Value("${mail.smtp.auth}")
     private String userName;
 

     @Value("${mail.from}")
     private String password;
     @RequestMapping(value = { "/", "" })
     public String hellTask() {
         System.out.println("userName:" + userName);
         System.out.println("password:" + password);
         return "hello task !!";
     }
 }
 

 userName:false
 password:me@localhost
 

@ConfigurationProperties(prefix ="db.clickhouse")

 import lombok.Data;
 import org.springframework.boot.context.properties.ConfigurationProperties;
 import org.springframework.context.annotation.Configuration;
 /**
 * ClickHouse圈选数据库的常量
 */
 @Data
 @Configuration
 @ConfigurationProperties(prefix ="db.clickhouse")
 public class DbClickHouseConfig {
 String db_name ="ecom_dmp_ch";
 String db_cluster_name ="ecom_public";
 String user_tag_select ="user_tag_select";
 String user_behavior_select ="user_behavior_select";
 String user_tag_shard_column ="uid";
 String item_select_table ="item_tag_select";
 String item_shard_column ="item_id";
 String seller_select_table ="seller_tag_select";
 String seller_shard_column ="seller_id";
 String partition ="p_date";
 String partition_date_format ="yyyy-MM-dd";
 String driver_id ="clickhouse_01";
 }
 

 db:
 clickhouse:
 db_name:"ecom_dmp_ch_select"
     db_cluster_name:"ecom_public"
     user_tag_select:"user_tag_select"
     user_behavior_select:"user_behavior_select"
     user_tag_shard_column:"uid"
     item_select_table:"item_tag_select"
     item_shard_column:"item_id"
     seller_select_table:"ecom_dmp_ch"
     seller_shard_column:"seller_id"
     partition:"p_date"
     partition_date_format:"yyyy-MM-dd"
     driver_id:"clickhouse_01"