springboot Binder类

比Environment类好用很多，可以非常方便地进行类型转换,可以将属性绑定到对象,Map,List等类型上

# 绑定到对象
  MailPropertiesC propertiesC = Binder.get(environment) //首先要绑定配置器
      //再将属性绑定到对象上
      .bind( "kaka.cream.mail-c", Bindable.of(MailPropertiesC.class) ).get(); //再获取实例
      
  # 绑定Map
  Map<String,Object> propMap = Binder.get(environment)
      .bind( "fish.jdbc.datasource",Bindable.mapOf(String.class, Object.class) ).get();
      
  # 绑定List
  List<String> list = Binder.get(environment)
      .bind( "kaka.cream.list",Bindable.listOf(String.class) ).get();

例如:

// 绑定的类
public class MultiKafkaProperties {
	private Map<String, Properties> producer;
	private Map<String, Properties> consumer;
	// getter
	// setter
}

# 配置
kafka.producer.server=127.0.0.1:9093
kafka.producer.username=kafka
kafka.producer.password=password
kafka.producer.topic=topic1

kafka.consumer.server=127.0.0.1:9093
kafka.consumer.username=kafka
kafka.consumer.password=password
kafka.consumer.topic=topic1
kafka.consumer.group.id=group1
kafka.consumer.poll.ms=3000
kafka.consumer.max.poll.records=300

// 绑定
Binder binder = Binder.get(environment);
MultiKafkaProperties config = binder.bind("kafka", MultiKafkaProperties.class).get();