Gatling:转换响应并将其写入JSON文件



Scala/Gatling 来说相当陌生,我已经搜索了很多 SO,但没有针对我的问题得到任何回答。所以这是我的代码

    val adminUplFile: ScenarioBuilder = scenario("Admin user uploads file")
    .exec(http("Upload File")
      .post("/file") 
      .header("username", "example") r
      .header("password", "80HL/d1fETqxuCArAbIU6/Sb3F2nSTCqw/eqw1lzJio=") 
      .formUpload("file", "uploadFile") // body params ("key" , "path of the file/name")
      .formParamSeq(Seq(("uploadByID", "1"), ("location", "meetings"), ("personID", "0"), ("uploadTimeStamp", "2019-01-15 10:01:04.426"), ("md5Hash", "n95QI48+Uqxfw0hTnJdqMA=="))) 
      .check(status.is(200)) 
      .check(jsonPath("$.uuid").saveAs("guidList"))) 
    .exec { session =>
    val writer = new PrintWriter(new FileOutputStream(new File("src/gatling/resources/extractedData/GuidList.json"), true))
    writer.write(session(""guidList"").as[String].trim)
    writer.write("n")
    writer.close()
    session  }
setUp(
    adminUplFile.inject(constantUsersPerSec(2) during (1 seconds)).protocols(httpConf)
  )

这是我试图提取的响应:

 {
    "uuid": "3a917e22-3c76-45de-a104-4e2aa4b72a35"
}

所以我被写入文件是:
"3a917e22-3c76-45de-a104-4e2aa4b72a35"
"929c89c0-7a1a-4a18-8ee8-2958c9cd430f"

我想要的是:
[

"3a917e22-3c76-45de-a104-4e2aa4b72a35" ,
"929c89c0-7a1a-4a18-8ee8-2958c9cd430f"

]

只是看着它,它看起来像一个简单的案例,在文件中添加方括号和逗号,但实际上,每个虚拟用户都试图附加同一个文件,我正在努力如何使其格式化方括号不会再次使用并且只使用一次。

所以我不想要:
["3a917e22-3c76-45de-a104-4e2aa4b72a35"],
["929c89c0-7a1a-4a18-8ee8-2958c9cd430f"]

基本上用before after加特林的钩子和一些版作家的魔法

这是我的代码:

 try {
  val br = new BufferedReader(new FileReader(deleteGuidsFilePath))
  var last : String = ""
  var line = br.readLine
  while ({line != null})
  {
    last = line
    line = br.readLine
  }
  br.close()
  afterPw.write(last.replace(",", "]"))
  afterPw.close()
}
catch {
  case e: Throwable => println("Couldn't read the file")
}

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