一个空指针异常,代码如下，打了断点，一到“TOPICID”那里（在下方注释4那里）就抛异常-_-||

Question

/**导出到excel * @param * @throws Exception */ @RequestMapping(value="/excel") public ModelAndView exportExcel() throws Exception{ logBefore(logger, Jurisdiction.getUsername()+"导出Entity到excel"); if(!Jurisdiction.buttonJurisdiction(menuUrl, "cha")){return null;} ModelAndView mv = new ModelAndView(); PageData pd = new PageData(); pd = this.getPageData(); Map<String,Object> dataMap = new HashMap<String,Object>(); List<String> titles = new ArrayList<String>(); titles.add("表内id"); //1 titles.add("姓名"); //2 titles.add("实体类型"); //3 titles.add("topicid"); //4 titles.add("评论"); //5// titles.add("0/1,1:已删"); //6 dataMap.put("titles", titles); List<PageData> varOList = entityService.listAll(pd); List<PageData> varList = new ArrayList<PageData>(); for(int i=0;i<varOList.size();i++){ PageData vpd = new PageData(); vpd.put("var1", varOList.get(i).get("ID").toString()); //1 vpd.put("var2", varOList.get(i).getString("NAME")); //2 vpd.put("var3", varOList.get(i).getString("ENTITYTYPE")); //3 vpd.put("var4", varOList.get(i).get("TOPICID").toString()); //4 vpd.put("var5", varOList.get(i).getString("COMMENTS")); //5// vpd.put("var6", varOList.get(i).getString("DEL")); //6 varList.add(vpd); } dataMap.put("varList", varList); ObjectExcelView erv = new ObjectExcelView(); mv = new ModelAndView(erv,dataMap); return mv; }

Answer 1

if(varOList.get(i).get("TOPICID")!=null){

vpd.put("var4", varOList.get(i).get("TOPICID").toString()); //4

}

Answer 2

varOList.get(i).get("TOPICID") 返回值判一下空.

Answer 3

话说在哪里判断呀