JavaWeb中导出excel文件的简单方法

在平时做系统项目时，经常会需要做导出功能，不论是导出excel，还是导出cvs文件。我下面的demo是在springmvc的框架下实现的。

1.JS中只需要用GET模式请求导出就可以了：

$('#word-export-btn').parent().on('click',function(){
var promotionWord = JSON.stringify($('#mainForm').serializeObject());
location.href="${ctx}/promotionWord/export?promotionWord="+promotionWord;
});

2.在controller中要做的是将文件以数据流格式输出：

 @RequestMapping("/export")
 public void export(HttpSession session, String promotionWord, HttpServletRequest request, HttpServletResponse response) throws IOException {
   User sessionUser = (User) session.getAttribute("user");
   JSONObject jsonObj = JSONObject.parseObject(promotionWord);
   HSSFWorkbook wb = promotionWordService.export(sessionUser.getId(), jsonObj);
   response.setContentType("application/vnd.ms-excel");
   Calendar cal = Calendar.getInstance();
   SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
   String fileName = "word-" + sdf.format(cal.getTime()) + ".xls";
   response.setHeader("Content-disposition", "attachment;filename=" + fileName);
   OutputStream ouputStream = response.getOutputStream();
   wb.write(ouputStream);
   ouputStream.flush();
   ouputStream.close();
 }

3.在service中需要将数据写入到格式文件中：

public HSSFWorkbook export(String userId, JSONObject jsonObj) {
HSSFWorkbook wb = new HSSFWorkbook();
HSSFSheet sheet = wb.createSheet("word");
HSSFRow row = sheet.createRow(0);
   HSSFCellStyle style = wb.createCellStyle();
   style.setAlignment(HSSFCellStyle.ALIGN_CENTER);
List<PromotionWord> pWordList;
Map<String, Object> map = new HashMap<>();
map.put("userId", userId);
map.put("checkExistRule", jsonObj.getString("checkExistRule"));
map.put("status", jsonObj.getString("status"));
map.put("qsStar", jsonObj.getString("qsStar"));

map.put("impressionCount", jsonObj.getString("impressionCount"));

map.put("selectGroupId", jsonObj.getString("selectGroupId"));
map.put("isCheck", jsonObj.getString("isCheck"));
map.put("word", jsonObj.getString("word"));

Long impression = jsonObj.getLong("impressionCount");
Long click = jsonObj.getLong("clickCount");
if(impression != null){
PromotionWord word = new PromotionWord();
word.setCreatedBy(userId);
word.setImpressionCount7(impression);
pWordList = getTwentyPercentlists(word);
if(pWordList != null && pWordList.size() > 0){
map.put("impressionCount", pWordList.get(pWordList.size()-1).getImpressionCount());
}else{
map.put("impressionCount", 1);
}
}else if(click != null){
PromotionWord word = new PromotionWord();
word.setCreatedBy(userId);
word.setClickCount7(click);
pWordList = getTwentyPercentlists(word);
if(pWordList != null && pWordList.size() > 0){
map.put("clickCount", pWordList.get(pWordList.size()-1).getClickCount());
}else{
map.put("clickCount", 1);
}
}

List<PromotionWord> list = commonDao.queryList(PROMOTION_WORD_DAO + ".queryExportDataByUser", map);

String[] excelHeader = {"关键词", "价格","搜索热度","推广评分","购买热度","曝光量","点击量","点击率","推广时长","花费","平均点击花费","匹配产品数","预估排名","状态"};
for (int i = 0; i < excelHeader.length; i++) {
     HSSFCell cell = row.createCell(i);
     cell.setCellValue(excelHeader[i]);
     cell.setCellStyle(style);
     if(i == 0){
     sheet.setColumnWidth(0, 30*256);
     }else{      
     sheet.setColumnWidth(i, 10*256);
     }
   }
if(list != null && list.size() > 0)
for (int i = 0; i < list.size(); i++) {
     row = sheet.createRow(i + 1);
     PromotionWord word = list.get(i);
     row.createCell(0).setCellValue(word.getWord());
     row.createCell(1).setCellValue(word.getPrice()+"");
     row.createCell(2).setCellValue(word.getSearchCount());
     row.createCell(3).setCellValue(word.getQsStar());
     row.createCell(4).setCellValue(word.getBuyCount());
     row.createCell(5).setCellValue(word.getImpressionCount7());
     row.createCell(6).setCellValue(word.getClickCount7());
     if(word.getClickCount7() == 0L){
     row.createCell(7).setCellValue("0.00％");
     }else{
     DecimalFormat df = new DecimalFormat("0.00％");
     row.createCell(7).setCellValue(df.format((Double.valueOf(word.getClickCount7())/Double.valueOf(word.getImpressionCount7()))));
     }
     row.createCell(8).setCellValue(word.getOnlineTime7());
     row.createCell(9).setCellValue(word.getCost7()+"");
     row.createCell(10).setCellValue(word.getAvgCost7()+"");
     row.createCell(11).setCellValue(word.getMatchCount());
     String rank = "";
     if(word.getMatchCount() != null && word.getMatchCount() != 0){
     if(word.getProspectRank() == null || word.getProspectRank() == 0L){      
      rank = "其他位置";
      }else{
      rank = "第"+word.getProspectRank()+"位";
      }
     }else{
     rank = "---";
     }

row.createCell(12).setCellValue(rank);
     row.createCell(13).setCellValue(word.getStatus() == 1 ?"暂停":"启动");
   }

return wb;
}

这样之后就可以直接点击导出就有效果了。