在Jmeter中，我想使用JSR 223 PreProcessor groovy准备multipart/form-data
我尝试像这样使用vars.put（“formData”，formData）

import org.apache.http.entity.ContentType
import org.apache.http.entity.mime.MultipartEntityBuilder
import org.apache.http.entity.mime.content.FileBody
import org.apache.http.entity.mime.content.StringBody
import org.apache.http.util.EntityUtils

def filePath = "path/to/file"
def file = new File(filePath)

def payload = "some payload"

def builder = MultipartEntityBuilder.create().setCharset(java.nio.charset.StandardCharsets.UTF_8)

builder.addPart("payload", new StringBody(payload, ContentType.TEXT_PLAIN))
builder.addPart("file", new FileBody(file, ContentType.APPLICATION_OCTET_STREAM, file.name))

def formData = builder.build()

vars.put("formData", formData)

并得到错误“No signature of method：org.apache.jmeter.threads.JMeterVariables.put（）适用于参数类型：（String，org.apache.http.entity.mime.MultipartFormEntity）”如果我想在脚本中准备multipart/form-data，然后在HTTP请求中使用它，我应该怎么做？