Scala使用jackson解析JSON

• jackson依赖

  
      com.fasterxml.jackson.module
      jackson-module-scala_2.11
      2.6.5
  
  

• 实例，@BeanProperty为样本类生成 Java 风格的 get、set方法，@JsonProperty注解映射字段

  import java.util
  import com.fasterxml.jackson.annotation.JsonProperty
  
  import scala.beans.BeanProperty
  import scala.collection.JavaConversions._
  
  object parse {
    case class Item(@JsonProperty("bw") @BeanProperty bw: String, @JsonProperty("cdn") @BeanProperty cdn: Long, @JsonProperty("ct") @BeanProperty ct: Long)
    case class Outer(@JsonProperty("video_bandwidths") @BeanProperty items: util.ArrayList[Item])
  
    def main(args: Array[String]): Unit = {
      import com.fasterxml.jackson.core.JsonParser.Feature
      import com.fasterxml.jackson.databind.ObjectMapper
  
      val mapper = new ObjectMapper
      //解析器支持解析单引号
      mapper.configure(Feature.ALLOW_SINGLE_QUOTES, true)
      //解析器支持解析结束符
      mapper.configure(Feature.ALLOW_UNQUOTED_CONTROL_CHARS, true)
  
      val jsonMap = mapper.readValue("{\"video_bandwidths\":[ { \"bw\" : \"484456834\" , \"cdn\" : 0 , \"ct\" : 0} , { \"bw\" : \"160477600\" , \"cdn\" : 0 , \"ct\" : 1} , { \"bw\" : \"603954332\" , \"cdn\" : 0 , \"ct\" : 2}]}", classOf[Outer]) //转换为HashMap对象
  
      jsonMap.getItems.foreach(println)
      println(jsonMap.getItems.get(0).getBw)
      jsonMap.getItems.foreach(a=>println(a.getBw))
    }
  }