行为奇怪的Json空数据

Question

    render ( ['P' : jsonObject.picId, 'A' : jsonObject.audioId, 'C' : jsonObject.caption, 'V' : jsonObject.vidTemplateId ] as JSON)

def vidpNmList = [][]
vidpNmList[0] = jsonObject.picId
vidpNmList[1] = jsonObject.audioId
vidpNmList[2] = jsonObject.caption

def vsaInst = vdSlotService.storeVideoSlotData( vidpNmList, session)

def picId = vidpNmList[0]
def audioId = vidpNmList[1]
def caption = vidpNmList[2]

当标题[currSlotNo]的值为空时，该行将导致错误：

if(!(caption[currSlotNo]) ) {
    log.debug(" caption is null and cannot be displayed. ")

}

HomeVu1.VdslotService updVideoSlotData pictureInst:331 Picid[currSlotNo]:331 HomeVu1.VdslotService updVideoSlotData Picmk:331

HomeVu1.VdslotService updVideoSlotData audmk：null

错误.处理请求时发生GrailsExceptionResolver JSONException：[POST]/HomeVu1/VideoShr/GetJSVidCoords

找不到JsonArray[0]..Stacktrace如下：org.codehaus.groovy.grails.web.json.JSONException：找不到JSONArray[0]。

如果引用vidpNmList数组中元素的值，也会出现相同的错误。

我做错了什么，或者是周围有一些工作？

        def captionVal = null
        try{ captionVal = caption[currSlotNo] 

            log.debug(" ${functionName} caption value assigned correctly ")
        }
        catch (Exception eWrite)
        {       
            //      fails - can only trap and work around the error atm.
                log.debug(" ${functionName} caption value fails to assign correctly - remains at null default - Error Message: $eWrite")                                
        }

显示将json对象标题元素从“null”字符串重置为实际的null后再分配给vidpnmlist的代码：

        for (def iC = 0; iC < jsonObject.caption.size() ; iC++)
        {
            String currCap = jsonObject.caption[iC]
            if( currCap == "null") 
            {
                log.debug(" getJsVisCoords null value iC: $iC " + " caption[iC]: " + jsonObject.caption[iC] + " currCap Length: " + currCap.length())
                jsonObject.caption[iC] = null
            }
            else
            {
                log.debug(" getJsVisCoords Non null value iC: $iC " + " caption[iC]: " + jsonObject.caption[iC] + " currCap Length: " + currCap.length())
            }

        }
        vidpNmList[2] = jsonObject.caption

-迈克

Answer 1

不确定JSON在此场景中的作用，但看看上面的代码，您有其他选择：

直到您将这些列表收集为标题audioId picId时为止

def picId = vidpNmList[0]
def audioId = vidpNmList[1]
def caption = vidpNmList[2]

您显示了一个接近于以下内容的输出：

def picId=[331, 332, 334, null, null, null, null, null, null, null, null, null]
    def audioId=[null, null, null, null, null, null, null, null, null, null, null, null]
    def Captions=[null, 333, 333, null, null, null, null, null, null, null, null]

现在这是我玩的名单：

    / you are current failing on this
    def pic=picId[0]


    //instead of above element[id] try .get(id)
    def cap=Captions.get(2)
    println "--- ${pic} @@@ ${cap}"

    //Then you can test by saying 
    if (cap&&something&&somethingEls) { 
        doSomething
    }

我回来了

--- 331  @@@ 333

  for (def iC = 0; iC < jsonObject.caption.size() ; iC++)

int iC=0
for (iC < jsonObject.caption.size() ; iC++) {

jsonObject?.caption?.eachWithIndex{ item, i ->
   if (JSONObject.NULL.equals(item) { 
      item=null
   } 
}
vidpNmList[2] = jsonObject.caption

def finalList=[]
jsonObject?.caption?.eachWithIndex{ item, i ->
   if (JSONObject.NULL.equals(item) { 
      item=null
   } 
  finalList << item
}
vidpNmList[2] = finalList

jsonObject?.caption?.each{ item ->
   if (JSONObject.NULL.equals(item) { 
      item=null
   } 
}
vidpNmList[2] = jsonObject.caption

if (!item ||(item && item=='null')) { 
 item=null
}