FastJSON在Scala中的应用

最新推荐文章于 2024-05-15 14:07:02 发布

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本文介绍如何在Scala项目中使用阿里云FastJSON库解析JSON字符串。包括配置Maven依赖、解析JSON对象与数组，并获取特定字段的值。

首先需要在pom.xml中加入依赖

<dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>fastjson</artifactId>
            <version>1.1.23</version>
 </dependency>

package online.daliang.learning

import com.alibaba.fastjson.JSON

/**
  * @author daliang on 2018/9/17
  */
object fastJson {
  def main(args: Array[String]): Unit = {
    val jsonString = "{\"et\":\"kanqiu_client_join\",\"vtm\":1435898329434,\"body\":{\"client\":\"866963024862254\",\"client_type\":\"android\",\"room\":\"NBA_HOME\",\"gid\":\"\",\"type\":\"\",\"roomid\":\"\"}," +
      "\"time\":[{\"arrayKey\":\"arrayVal\"},{\"key2\":\"val2\"}]}"
    println("Json String:--------")
    println(jsonString)
    println(jsonString.getClass)
    val json = JSON.parseObject(jsonString)
    println("Parse Json:--------")
    println(json)
    println(json.getClass)
    println(json.getInteger("vtm"))
    println(json.getString("et"))
    println(json.getJSONObject("body"))
    println(json.getJSONObject("body").getClass)
    println(json.getJSONObject("body").getString("client"))

    println("---------Array------------")
    println(json.get("time"))
    println(json.get("time").getClass)
    println(json.getJSONArray("time"))
    println(json.getJSONArray("time").getClass)

    println(json.getJSONArray("time").get(0))
    println(json.getJSONArray("time").get(0).getClass)
    println(json.getJSONArray("time").getJSONObject(0))
    println(json.getJSONArray("time").getJSONObject(0).getClass)

    println(json.getJSONArray("time").get(0))  //虽然都是JSONObject，但这个没有 get 方法
    //Error:(36, 46) value get is not a member of Object
    //    println(json.getJSONArray("time").get(0).get("arrayKey"))  //虽然都是JSONObject，但这个没有 get 方法
    println(json.getJSONArray("time").get(0).getClass)
    println(json.getJSONArray("time").getJSONObject(0).get("arrayKey"))   //虽然都是JSONObject，有 get 方法
    println(json.getJSONArray("time").getJSONObject(0).get("arrayKey").getClass)
  }

}

输出结果：

Json String:--------
{"et":"kanqiu_client_join","vtm":1435898329434,"body":{"client":"866963024862254","client_type":"android","room":"NBA_HOME","gid":"","type":"","roomid":""},"time":[{"arrayKey":"arrayVal"},{"key2":"val2"}]}
class java.lang.String
Parse Json:--------
{"body":{"client":"866963024862254","client_type":"android","gid":"","room":"NBA_HOME","roomid":"","type":""},"et":"kanqiu_client_join","time":[{"arrayKey":"arrayVal"},{"key2":"val2"}],"vtm":1435898329434}
class com.alibaba.fastjson.JSONObject
1379252570
kanqiu_client_join
{"client":"866963024862254","client_type":"android","gid":"","room":"NBA_HOME","roomid":"","type":""}
class com.alibaba.fastjson.JSONObject
866963024862254
---------Array------------
[{"arrayKey":"arrayVal"},{"key2":"val2"}]
class com.alibaba.fastjson.JSONArray
[{"arrayKey":"arrayVal"},{"key2":"val2"}]
class com.alibaba.fastjson.JSONArray
{"arrayKey":"arrayVal"}
class com.alibaba.fastjson.JSONObject
{"arrayKey":"arrayVal"}
class com.alibaba.fastjson.JSONObject
{"arrayKey":"arrayVal"}
class com.alibaba.fastjson.JSONObject
arrayVal
class java.lang.String

Process finished with exit code 0