Spring boot's properties property value configuration application.properties and custom properties

1. The configuration property value
   application.properties file is directly configured:
   

   com.ieen.super.name="MDD"

   Custom properties file configuration: src/main/resources/conf/boot.properties

   com.ieen.boot.name="123"
   com.ieen.boot.value="456"

2. Call the method
   @Value annotation to call the application.properties property value:
   

   @Value("${com.ieen.super.name}")
   private String name;

   The @Value annotation calls the custom properties property value:

   @PropertySource("classpath:conf/boot.properties")
   public class Main{
       @Value("${com.ieen.boot.name}")
       private String bootName;
   }

   Note: The @PropertySource annotation introduced custom properties since 1.5
   

   // value is custom configuration
   // ignoreResourceNotFound defaults to false, the file does not exist and an error is reported
   // encoding sets the encoding
   // name is the beanname of the Resource object
   @PropertySource(value = { "classpath:boot.properties",
           "classpath:conf/boot.properties" }, ignoreResourceNotFound = false, encoding = "UTF-8", name = "boot-custom.properties")

   @ConfigurationProperties configure the properties properties object:

   // Configuration before spring boot 1.5
   //@ConfigurationProperties(prefix = "com.ieen.boot",locations = "classpath:conf/boot.properties")
   @ConfigurationProperties(prefix = "com.ieen.boot") 
   // If custom properties are added
   @PropertySource(value = "classpath:conf/boot.properties", encoding = "UTF-8")
   @Component
   public class BootPropertiesBean {
       private String name;
       private String value;
       public String getName() {
           return name;
       }
       public void setName(String name) {
           this.name = name;
       }
       public String getValue() {
           return value;
       }
       public void setValue(String value) {
           this.value = value;
       }
   }

       @Autowired
       private BootPropertiesBean bean;