有以下场景，在我的JSON响应中有一个名为visit的值，它可以有1个或多个元素。因此，如果visit有1个元素，那么默认的负载应该发送到下一个POST请求，或者如果visit有多个元素，那么我正在获取一个随机值，并希望更新负载并发送到下一个POST请求。
让我详细说明一下，

条件1[在访视部分中有1个元素]

条件2[访视部分中有多个元素]

条件1的JSON响应

{"studyDTO":{"studyId":191,"studyCode":"test_ispptest2"},"sites":[{"studyId":191,"siteRecid":201,"siteId":"20000"}],"subjects":[{"studyId":191,"siteRecid":201,"subjectRecid":245,"subjectNumber":"20002"}],"states":null,"allVisits":true,"modalities":null,"examDates":null,"series":null,"transferType":null,"sftpLocations":[],"dicomLocations":[],"fileSystemLocations":[],"rawFileSystemLocations":[],"customFolder":null,"folderStructure":null,"customFile":null,"fileStructure":null,"includePS":null}

条件2的JSON响应

{"studyDTO":{"studyId":191,"studyCode":"test_ispptest2"},"sites":[{"studyId":191,"siteRecid":16521,"siteId":"11001"}],"subjects":[],"visits":[{"studyId":191,"visitSubmitName":"baseline","visitDisplayName":"Baseline","orderOfDisplay":10},{"studyId":191,"visitSubmitName":"cycle_1","visitDisplayName":"Cycle 1","orderOfDisplay":20}],"sftpLocations":[],"dicomLocations":[],"fileSystemLocations":[],"rawFileSystemLocations":[],"states":null,"modalities":null,"examDates":null,"series":null,"transferType":null,"customFolder":false,"customFile":false,"folderStructure":null,"fileStructure":null,"allSites":false,"allSubjects":true,"allVisits":false,"allStates":false,"allExamDates":false,"allModalities":false,"allSeries":false,"softEditOverride":false,"includePS":false,"includeSR":false,"includeRTStruct":false,"dicomTemplate":null,"errorMessage":null,"successMessage":null}

当我在条件2中时，获取随机的visitSubmitName、visitDisplayName、orderOfDisplay并在有效载荷中更新。

条件1的有效负载：

{"studyDTO":{"studyId":191,"studyCode":"test_ispptest2"},"sites":[{"studyId":191,"siteRecid":201,"siteId":"20000"}],"subjects":[{"studyId":191,"siteRecid":201,"subjectRecid":245,"subjectNumber":"20002"}],"states":null,"allVisits":true,"modalities":null,"examDates":null,"series":null,"transferType":null,"sftpLocations":[],"dicomLocations":[],"fileSystemLocations":[],"rawFileSystemLocations":[],"customFolder":null,"folderStructure":null,"customFile":null,"fileStructure":null,"includePS":null}

条件2的有效负载：

{"studyDTO":{"studyId":191,"studyCode":"test_ispptest2"},"sites":[{"studyId":191,"siteRecid":16521,"siteId":"11001"}],"allSubjects":true,"states":null,"visits":[{"studyId":191,"visitSubmitName":"baseline","visitDisplayName":"Baseline","orderOfDisplay":10}],"modalities":null,"examDates":null,"series":null,"transferType":null,"sftpLocations":[],"dicomLocations":[],"fileSystemLocations":[],"rawFileSystemLocations":[],"customFolder":null,"folderStructure":null,"customFile":null,"fileStructure":null,"includePS":null}

条件1的有效载荷的唯一变化是，

到目前为止，我尝试的解决方案是使用以下代码创建一个JSR223后处理器：

import groovy.json.JsonSlurper
Random rnd = new Random();
def jsonString = prev.getResponseDataAsString();
def jsonConvert = new JsonSlurper();
def object = jsonConvert.parseText(jsonString);
def studyCode = object.studyDTO.studyCode;
def visitS = object.visits.size().toString();
def visitSize = visitS?.isInteger() ? visitS.toInteger() : null
def visitNUM = rnd.nextInt(visitSize);
//def defaultPayload = "{"studyDTO":{"studyId":${studyID},"studyCode":"${study_name}"},"sites":[{"studyId":${studyID},"siteRecid":${siteRecID},"siteId":"${siteID}"}],"subjects":[{"studyId":${studyID},"siteRecid":${siteRecID},"subjectRecid":${subjectRecID},"subjectNumber":"${subjectNumber}"}],"states":null,"allVisits":true,"modalities":null,"examDates":null,"series":null,"transferType":null,"sftpLocations":[],"dicomLocations":[],"fileSystemLocations":[],"rawFileSystemLocations":[],"customFolder":null,"folderStructure":null,"customFile":null,"fileStructure":null,"includePS":null}"

if (visitSize>1) {
    def visitSubmitName = object.visits[visitNUM].visitSubmitName
    def visitDisplayName = object.visits[visitNUM].visitDisplayName
    def orderOfDisplay= object.visits[visitNUM].orderOfDisplay.toString();
    //Change the payload with the three value 

    vars.put('payload',updatedPayload )
}
else {
    vars.put('payload',defaultPayload )
}

下一个后采样器，

错误详细信息：
1.获取defaultPayload声明时出错，需要用于更新有效负载的逻辑。
1.后取样器声明是否正确？
谢谢，提前说