這兩天寫Excel匯出，以前寫過，但現在實在是想不起了，就翻了一下以前的專案程式碼，特此記錄！

 
       //生成檔案路徑
        String toPath = rootPath + "cost/tmp/" + fileName;
        //建立workbook
        HSSFWorkbook wb = new HSSFWorkbook(new FileInputStream(new File(tempPath)));
        //cell風格、樣式
        HSSFCellStyle cellStyle = wb.createCellStyle();
        //迴圈list資料，迴圈一次，寫一行資料
        for (int i = 0; i < borrowDatList.size(); i++) {
            //建立行
            Row row = dataSheet.createRow(costLen + i + 1);
            //獲取list資料,轉為map
            Map map1 = (Map) borrowDatList.get(i);
            //轉為entry
            Set<Map.Entry> entry = map1.entrySet();
            String[] dept_code = map1.get("dept_code").toString().split("-");
            map1.put("DEPT_CODE", dept_code[0]);
            //準備遍歷
            Iterator<Map.Entry> ite = entry.iterator();
            int j = 0;
            //遍歷資料，往Excel表格寫資料
            while (ite.hasNext()) {
                Map.Entry entry1 = ite.next();
                entry1.getKey();
                String val = Tools.filterNull(entry1.getValue());
                Cell cell = row.createCell(j++);
                cell.setCellValue(val);
            }
        }
        FileOutputStream out = new FileOutputStream(toPath);
        wb.write(out);
        out.close();