JavaWeb中導出excel文件的簡單方法

1.JS中只需要用GET模式請求導出就可以了:

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

2.在controller中要做的是將文件以數據流格式輸出:

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@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中需要將數據寫入到格式文件中:

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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 = {"關鍵詞", "價格","搜索熱度","推廣評分","購買熱度","曝光量","點擊量","點擊率","推廣時長","花費","平均點擊花費","匹配產品數","預估排名","狀態"};
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 ?"暫停":"啓動");
    }
 
return wb;
}
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