SpringBoot整体读取多个配置属性及其相关操作方法

org.crazyit.enabled=true
org.crazyit.name=Crazy Java
org.crazyit.remoteAddress=192.168.1.188
org.crazyit.item.brand=Tesla
org.crazyit.item.comments=Good, Excellent

<!-- 添加该依赖后IDEA可以提供自动补全功能 -->
<dependency>
   <groupId>org.springframework.boot</groupId>
   <artifactId>spring-boot-configuration-processor</artifactId>
   <optional>true</optional>
</dependency>

// 指定读取以org.crazyit.*开头的属性
@ConfigurationProperties(prefix = "org.crazyit", ignoreUnknownFields=false)
@Component
public class CrazyitProperties
{
    // 指定同名的实例变量和setter方法。SpringBoot会通过反射调用setter方法来完成属性值注入
   private boolean enabled;
   private String name;
   private InetAddress remoteAddress;
   private final Item item = new Item();
         // 省略getter\setter 
   public static class Item
   {
      private String brand;
      private List<String> comments = new ArrayList<>(Collections.singleton("GREAT"));
            // 省略getter\setter 
   }
}

@RestController
public class HelloController
{
   private final CrazyitProperties crazyitProperties;
   // 依赖注入CrazyitProperties属性处理Bean
   @Autowired
   public HelloController(CrazyitProperties crazyitProperties)
   {
      this.crazyitProperties = crazyitProperties;
   }
   @GetMapping
   public CrazyitProperties hello()
   {
      return crazyitProperties;
   }
}

@ConfigurationProperties(prefix = "org.crazyit", ignoreUnknownFields=false)
public class CrazyitProperties
{
   private boolean enabled;
   private String name;
   private InetAddress remoteAddress;
   private final Item item;
   @ConstructorBinding
   public CrazyitProperties(boolean enabled, String name, InetAddress remoteAddress, Item item)
   {
      this.enabled = enabled;
      this.name = name;
      this.remoteAddress = remoteAddress;
      this.item = item;
   }
       // 省略getter\setter 
   public static class Item
   {
      private String brand;
      private List<String> comments = new ArrayList<>(Collections.singleton("GREAT"));
       // 省略getter\setter 
   }
}

org:
  crazyit:
    enabled: true
    name: 哈利波特
    remote-address: 192.168.1.188
    item:
      brand: Apple
      comments:
        - Good
        - Excellent

@SpringBootApplication
// 指定扫描org.crazyit.app.config包及其子包下的@ConfigurationProperties注解修饰的类
@ConfigurationPropertiesScan("org.crazyit.app.config")
public class App
{
   public static void main(String[] args)
   {
      // 创建Spring容器、运行Spring Boot应用
      SpringApplication.run(App.class, args);
   }
}

public class Book
{
   private String title;
   private double price;
   private String author;
   private List<String> keywords;
	// 省略getter、setter
}

@Configuration
public class MyConfig
{
   @Bean
   // @ConfigurationProperties注解会驱动Spring自动调用该Bean的setter方法
   @ConfigurationProperties("fkjava.book")
   public Book book()
   {
      return new Book();
   }
}

fkjava:
  book:
    title: "美语音标"
    price: 128
    author: "赖世雄"
    keywords:
      - 英语
      - 音标

@RestController
public class HelloController
{
   private final Book book;
    // 通过构造器注入Book对象
   @Autowired
   public HelloController(Book book)
   {
      this.book = book;
   }
   @GetMapping
   public Book hello()
   {
      return book;
   }
}

// 指定读取以org.crazyit.*开头的属性
@ConfigurationProperties(prefix = "org.crazyit")
@Component
public class CrazyitProperties
{
   private Duration timeout;
    //   @DurationUnit注解指定默认的时间单位
   @DurationUnit(ChronoUnit.SECONDS)
   private Duration lastTime;
   private Period runPeriod;
    // @DataSizeUnit注解指定默认的数据单位
   @DataSizeUnit(DataUnit.MEGABYTES)
   private DataSize maxSize;
	// 省略getter、setter
}

org.crazyit.timeout=30000
# 默认单位是秒
org.crazyit.last-time=45
org.crazyit.run-period=2m5d
org.crazyit.max-size=2

@RestController
public class HelloController
{
   private final CrazyitProperties crazyitProperties;
   // 依赖注入CrazyitProperties属性处理Bean
   @Autowired
   public HelloController(CrazyitProperties crazyitProperties)
   {
      this.crazyitProperties = crazyitProperties;
   }
   @GetMapping
   public Map<String, Object> hello()
   {
      System.out.println(crazyitProperties.getMaxSize().toKilobytes());
      return Map.of("props", crazyitProperties,
            "maxSize", crazyitProperties.getMaxSize().toKilobytes());
   }
}

<!-- 添加Spring Boot Validation依赖库 -->
<dependency>
   <groupId>org.springframework.boot</groupId>
   <artifactId>spring-boot-starter-validation</artifactId>
</dependency>

// 指定读取以org.crazyit.*开头的属性
@ConfigurationProperties(prefix = "org.crazyit", ignoreUnknownFields=false)
@Component
@Validated
public class CrazyitProperties
{
   @NotEmpty
   private String name;
   @Range(max = 150, min=90, message = "价格必须位于90～150之间")
   private double price;
   @Pattern(regexp = "[1][3-8][0-9]{9}", message = "必须输入有效的手机号")
   private String mobile;
   @Valid
   private final Item item = new Item();
	// 省略getter setter
   public static class Item
   {
      @Length(min=5, max=10, message = "品牌名长度必须在5到10个字符")
      private String brand;
      @Size(min = 1, message = "comments至少包含一个元素")
      private List<String> comments = new ArrayList<>(Collections.singleton("GREAT"));
	// 省略getter、setter
   }
}

org.crazyit.name=Crazy Java
org.crazyit.price=89
org.crazyit.mobile=13334444
org.crazyit.item.brand=Apple
org.crazyit.item.comments=Great, Excellent