springboot自定义配置文件转换器

/**
 * Qualifier for beans that are needed to configure the binding of
 * {@link ConfigurationProperties} (e.g. Converters).
 *
 * @author Dave Syer
 */
@Qualifier(ConfigurationPropertiesBinding.VALUE)
@Target({ ElementType.TYPE, ElementType.METHOD })
@Retention(RetentionPolicy.RUNTIME)
@Documented
public @interface ConfigurationPropertiesBinding {

  /**
   * Concrete value for the {@link Qualifier @Qualifier}.
   */
  String VALUE = "org.springframework.boot.context.properties.ConfigurationPropertiesBinding";

}

/**
 * A converter converts a source object of type {@code S} to a target of type {@code T}.
 *
 * <p>Implementations of this interface are thread-safe and can be shared.
 *
 * <p>Implementations may additionally implement {@link ConditionalConverter}.
 *
 * @author Keith Donald
 * @since 3.0
 * @param <S> the source type
 * @param <T> the target type
 */
@FunctionalInterface
public interface Converter<S, T> {

  /**
   * Convert the source object of type {@code S} to target type {@code T}.
   * @param source the source object to convert, which must be an instance of {@code S} (never {@code null})
   * @return the converted object, which must be an instance of {@code T} (potentially {@code null})
   * @throws IllegalArgumentException if the source cannot be converted to the desired target type
   */
  @Nullable
  T convert(S source);

}

package com.ducheng;

import javax.annotation.PostConstruct;

import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.stereotype.Component;

@ConfigurationProperties(prefix = "person")
public class Person  {
  
  private String name;
  
  private Integer age;
  
    private Dog dog;

  public String getName() {
    return name;
  }

  public void setName(String name) {
    this.name = name;
  }

  public Integer getAge() {
    return age;
  }

  public void setAge(Integer age) {
    this.age = age;
  }

  

  public Dog getDog() {
    return dog;
  }

  public void setDog(Dog dog) {
    this.dog = dog;
  }

  
  
  public Person(String name, Integer age, Dog dog) {
    super();
    this.name = name;
    this.age = age;
    this.dog = dog;
  }

  public Person() {
    super();
    // TODO Auto-generated constructor stub
  }  
}


package com.ducheng;
// 记住，方法一定要有set get 
public class Dog {

  private String dogName;
  
  private Integer dongAge;

  public String getDogName() {
    return dogName;
  }

  public void setDogName(String dogName) {
    this.dogName = dogName;
  }

  public Integer getDongAge() {
    return dongAge;
  }

  public void setDongAge(Integer dongAge) {
    this.dongAge = dongAge;
  }

  public Dog(String dogName, Integer dongAge) {
    super();
    this.dogName = dogName;
    this.dongAge = dongAge;
  }

  public Dog() {
    super();
    // TODO Auto-generated constructor stub
  }
  
  
}

@ConfigurationPropertiesBinding
@Component // 必须加上这个，不加上这个不生效
public class CostomConvert implements Converter<String, Dog >{

  @Override
  public Dog convert(String source) {
    // TODO Auto-generated method stub
    return JSON.parseObject(source, Dog.class);
  }



}

yml 配置文件 
person:
  name: ducheng
  dog: '{"dogName": "maomao", "dongAge": 3}'

@SpringBootApplication
// 制定开始使用哪个类上面的ConfigurationPropertie
@EnableConfigurationProperties(Person.class)
public class SpringbootEncryptApplication implements ApplicationRunner {
  public static void main(String[] args) {
    SpringApplication.run(SpringbootEncryptApplication.class, args);
  }

  @Override
  public void run(ApplicationArguments args) throws Exception {
    // TODO Auto-generated method stub
    System.out.println("dogName : "+person.getDog().getDogName());
  }

}

person.dog= {"dogName": "maomao", "dongAge": 3} // 要去掉‘’
person.name= ducheng