前端框架easyUI，後端java，使用poi匯出資料暫存到伺服器，然後打包下載。
用於解決大資料一次性匯出到一個excel記憶體溢位問題和請求超時504問題

1，前端請求js

$$.openProcessingDialog();  //開啟等待動畫
    $.ajax({
        type: "POST",dataType: "JSON",
        url:exportUrl,
        data: {search_condition:JSON.stringify(params)},
        success: function(data){
            $$.closeProcessingDialog();//關閉等待動畫
 

            if(data.errorCode==0){
                //執行下載
                $(formSearchTemplate).form('submit', {
                    url : "/kywdop/actions/tool/download.do?actionId=tool_downloadFile",
                    onSubmit : function(param) {
                        param.FileName = data.msg;
                    }
                })
            }else
 
{
                alert(data.msg);
            }
        }
    });

2，打包請求

與業務相關操作，資料是模擬的假資料，可以通過改變迴圈變數測試大資料的匯出\
區分資料量匯出不同格式資料，\
如果totnum<100w條，匯出一個excel檔案\
如果totnum>100w條，每10w條匯出到一個excel，打成壓縮包下載

@RequestMapping(value="/exportShiperrdtl")
    public CIPResponseMsg testExport(CIPReqParameter parameter,HttpServletRequest request,HttpServletResponse response){
        CIPResponseMsg res = new
 
 CIPResponseMsg();
        //模擬資料總數
        int totnum = 2200000;
        //每個excel最大行數
        int maxrow = 1000000;
        long start = System.currentTimeMillis();
        //頁數，每頁一個單獨的excel檔案
        int page = totnum%maxrow==0?totnum/maxrow:totnum/maxrow+1;
        /** 1.建立臨時資料夾  */
        //String rootPath = request.getSession().getServletContext().getRealPath("/");
        String rootPath = "D:\\u02\\real_file\\kywdop\\";
        if(page>1){
            File temDir = new File(rootPath  + UUID.randomUUID().toString().replaceAll("-", ""));
            if(!temDir.exists()){
                temDir.mkdirs();
            }
            String filepath = temDir.getPath();

            /** 2.生成需要下載的檔案，存放在臨時資料夾內 */
            List<File> srcfile = new ArrayList<File>();
            //填充資料行
            for(int i=1;i<=page;i++){
                SXSSFWorkbook wb = new SXSSFWorkbook();
                //新建sheet頁
                Sheet sheet = wb.createSheet();
                //設定表頭
                Row row = sheet.createRow(0);
                CellStyle style = wb.createCellStyle();
                style.setAlignment(CellStyle.ALIGN_CENTER);

                Cell cell = row.createCell((short) 0);
                cell.setCellValue("姓名");
                cell.setCellStyle(style);
                cell = row.createCell((short) 1);
                cell.setCellValue("單位");
                cell.setCellStyle(style);
                cell = row.createCell((short) 2);
                cell.setCellValue("科室");
                cell.setCellStyle(style);
                cell = row.createCell((short) 3);
                cell.setCellValue("註冊日期");
                cell.setCellStyle(style);
                //模擬資料
                for (int p = 1; p< maxrow; p++) {
                    row = sheet.createRow(p);
                    row.createCell((short) 0).setCellValue("大名"+p);
                    row.createCell((short) 1).setCellValue("單位"+p);
                    row.createCell((short) 2).setCellValue("科室"+p);
                    row.createCell((short) 3).setCellValue((new Date()).toString());
                }
                String fileName = "\\使用者資訊" + i+".xls";
                FileOutputStream fos = null;
                try {
                    fos = new FileOutputStream(filepath+fileName);
                    wb.write(fos);
                    fos.flush();
                    fos.close();
                } catch (FileNotFoundException e) {
                    e.printStackTrace();
                    res.msg="伺服器錯誤";
                    res.errorCode=1;
                    return res;
                } catch (IOException e) {
                    e.printStackTrace();
                    res.msg="伺服器錯誤";
                    res.errorCode=1;
                    return res;
                }
                srcfile.add(new File(filepath+fileName));
            }
            /** 3.呼叫工具類，生成zip壓縮包 */
            String zipfilepath = rootPath+"excel.zip"; //壓縮包檔案路徑
            try {
                FileOutputStream fos2 = new FileOutputStream(new File(zipfilepath));
                ZipUtils.toZip(srcfile, fos2);
            } catch (IOException e) {
                e.printStackTrace();
            }

            /** 4.刪除臨時檔案和資料夾 */
            File[] listFiles = temDir.listFiles();
            for (int i = 0; i < listFiles.length; i++) {
                listFiles[i].delete();
            }
            temDir.delete();
            res.msg=zipfilepath;
        }else{
            SXSSFWorkbook wb = new SXSSFWorkbook();
            //新建sheet頁
            Sheet sheet = wb.createSheet();
            //設定表頭
            Row row = sheet.createRow(0);
            CellStyle style = wb.createCellStyle();
            style.setAlignment(CellStyle.ALIGN_CENTER);

            Cell cell = row.createCell((short) 0);
            cell.setCellValue("姓名");
            cell.setCellStyle(style);
            cell = row.createCell((short) 1);
            cell.setCellValue("單位");
            cell.setCellStyle(style);
            cell = row.createCell((short) 2);
            cell.setCellValue("科室");
            cell.setCellStyle(style);
            cell = row.createCell((short) 3);
            cell.setCellValue("註冊日期");
            cell.setCellStyle(style);
            //模擬資料
            for (int p = 1; p< maxrow; p++) {
                row = sheet.createRow(p);
                row.createCell((short) 0).setCellValue("大名"+p);
                row.createCell((short) 1).setCellValue("單位"+p);
                row.createCell((short) 2).setCellValue("科室"+p);
                row.createCell((short) 3).setCellValue((new Date()).toString());
            }
            String fileName = "使用者資訊.xls";
            FileOutputStream fos = null;
            try {
                fos = new FileOutputStream(rootPath+fileName);
                wb.write(fos);
                fos.flush();
                fos.close();
            } catch (FileNotFoundException e) {
                e.printStackTrace();
                res.msg="伺服器錯誤";
                res.errorCode=1;
                return res;
            } catch (IOException e) {
                e.printStackTrace();
                res.msg="伺服器錯誤";
                res.errorCode=1;
                return res;
            }
            res.msg=rootPath+fileName;
        }
        long end = System.currentTimeMillis();
        log.info("匯出耗時："+(end-start)+" ms");
        res.errorCode=0;
        return res;
    }

百萬資料每個excel匯出多少條可以根據自己業務資料除錯，每個excel匯出越少，分的excel個數越多。

以上程式碼我替換為真實資料後的測試
效能測試
70w資料 每頁10w –> 174977ms

70w資料 每頁20w –> 154977ms

70w資料 每頁30w –> 163430ms

70w資料 每頁40w –> 141162ms

70w資料 每頁50w –> 180974ms

3，下載通用controller

通用的檔案下載只需要傳入伺服器的檔案全路徑即可下載，不區分檔案是壓縮包還是excel

/**
     * 檔案下載
     * @param request
     * @param response
     * @throws IOException
     */
    @RequestMapping(value="/download")
    public void templateDownload(HttpServletRequest request, HttpServletResponse response) throws IOException{

        String path = request.getParameter("FileName");
        File file = new File(path);
        String fileName = StringUtils.substringAfterLast(path,"\\");
        if (request.getHeader("User-Agent").toUpperCase().indexOf("MSIE") > 0) {  //IE瀏覽器
            fileName = URLEncoder.encode(fileName, "UTF-8");
        } else {  //非IE瀏覽器
            fileName = new String(fileName.getBytes("UTF-8"), "ISO8859-1");
        }
        response.setCharacterEncoding("utf-8");
        response.setHeader("Content-Disposition", "attachment;fileName="+fileName);
        //輸入流寫入輸出流
        InputStream inputStream = new FileInputStream(file);
        OutputStream ouputStream = response.getOutputStream();
        byte b[] = new byte[1024];
        int n ;
        //迴圈讀取 !=-1讀取完畢
        while((n = inputStream.read(b)) != -1){
            //寫入到輸出流 從0讀取到n
            ouputStream.write(b,0,n);
        }
        //關閉流、釋放資源
        ouputStream.close();
        inputStream.close();
    }

4,壓縮檔案工具類

下載地址