JavaWeb中导出excel文件

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。