public class ExcelUtils {

    private static final String INSPECTIONRECORD_SURFACE_TEMPLET_PATH = "download\\template\\materialList.xlsx";
    private static XSSFCellStyle cellstyle = null;

    public static void exportBom(HttpServletRequest request, HttpServletResponse response, Map map) throws IOException {
        
 
//模板的路徑，這個在自己的項目中很容易弄錯，相對位置一定要寫對啊
        String psth = request.getRealPath("/") + INSPECTIONRECORD_SURFACE_TEMPLET_PATH;
        Workbook webBook = readExcel(psth);
        Sheet sheet = webBook.getSheetAt(0);
        //調用樣式方法
        cellstyle = createCellStyle(webBook);
        sheet.setColumnWidth(0, 3766);//
 
列寬
        sheet.setColumnWidth(1, 4766);//列寬
        //開始操作模板，找到某行某列（某個cell），需要註意的是這裏有個坑，行和列的計數都是從0開始的
        //一次數據插入的位置不對，別灰心，多試幾次就好啦，你要是能看懂我下面的代碼，數據插在了什麽位置，你就明白了
        //打印時間
        int rows = 0;
        Row row = sheet.getRow(rows);
        //調用方法，賦值並給定樣式（寫樣式的時候這個工具類只能用XSSF而不能用HSSF,不然樣式會沒響應）
        setCellStyleWithValue(row.createCell(0),(String) map.get("title"));

        rows 
 
= 2;
        row = sheet.getRow(rows);
        row.createCell(1).setCellValue((String) map.get("date"));
//        setCellStyleWithValue(row.createCell(1),(String) map.get("date"));

        //負責人
        rows = 3;
        row = sheet.getRow(rows);
        row.createCell(1).setCellValue((String) map.get("leader"));
//        setCellStyleWithValue(row.createCell(1),(String) map.get("leader"));

        //審核人
        rows = 4;
        row = sheet.getRow(rows);
        row.createCell(1).setCellValue((String) map.get("Auditleader"));
//        setCellStyleWithValue(row.createCell(1),(String) map.get("Auditleader"));

        //在調用模板的時候，數據的插入不能直接應用模板行，不然數據會覆蓋掉哪行
        rows = 7;
        row = sheet.createRow(rows);
        row.createCell(0).setCellValue("編號");
        row.createCell(1).setCellValue("名稱");
        row.createCell(2).setCellValue("規格");
        row.createCell(3).setCellValue("數量");
        row.createCell(4).setCellValue("益值");
        row.setRowStyle(cellstyle);

        List<Map<String, Object>> list = (List<Map<String, Object>>) map.get("resultList");
        for (int i = 0; i < list.size(); i++) {
            row = sheet.createRow(rows++);
/*            row.createCell(0).setCellValue(StringUtils.objToStr(list.get(i).get("物料編號")));
            row.createCell(1).setCellValue(StringUtils.objToStr(list.get(i).get("物料名稱")));
            row.createCell(2).setCellValue(StringUtils.objToStr(list.get(i).get("物料規格")));
            row.createCell(3).setCellValue(Double.parseDouble(StringUtils.objToStr(list.get(i).get("物料消耗數量"))));
            row.createCell(4).setCellValue(Float.parseFloat(StringUtils.objToStr(list.get(i).get("物料消耗損益值"))));*/

            setCellStyleWithValue(row.createCell(0),StringUtils.objToStr(list.get(i).get("物料編號")));
            setCellStyleWithValue(row.createCell(1),StringUtils.objToStr(list.get(i).get("物料名稱")));
            setCellStyleWithValue(row.createCell(2),StringUtils.objToStr(list.get(i).get("物料規格")));
            setCellStyleWithValue(row.createCell(3),Double.parseDouble(StringUtils.objToStr(list.get(i).get("物料消耗數量"))));
            setCellStyleWithValue(row.createCell(4),Float.parseFloat(StringUtils.objToStr(list.get(i).get("物料消耗損益值"))));

        }
        writeExcel(response, webBook, (String) map.get("title"));
    }

   private static XSSFWorkbook readExcel(String filePath) {
        InputStream in = null;
        XSSFWorkbook work = null;
        try {
            in = new FileInputStream(filePath);
            work = new XSSFWorkbook(in);
        } catch (FileNotFoundException e) {
            System.out.println("文件路徑錯誤");
            e.printStackTrace();
        } catch (IOException e) {
            System.out.println("文件輸入流錯誤");
            e.printStackTrace();
        }
        return work;
    }

    private static void writeExcel(HttpServletResponse response, Workbook work, String fileName) throws IOException {
        OutputStream out = null;
        try {
            out = response.getOutputStream();
            response.setContentType("application/ms-excel;charset=UTF-8");
            response.setHeader("Content-Disposition", "attachment;filename="
                    .concat(String.valueOf(URLEncoder.encode(fileName + ".xls", "UTF-8"))));
            work.write(out);
        } catch (IOException e) {
            System.out.println("輸出流錯誤");
            e.printStackTrace();
        } finally {
            out.close();
        }
    }

    private static Cell setCellStyleWithStyleAndValue(CellStyle style, Cell cell, String value) {
        cell.setCellStyle(style);
        cell.setCellValue(value);
        return cell;
    }

    private static Cell setCellStyleWithStyleAndValue(CellStyle style, Cell cell, Double value) {
        cell.setCellStyle(style);
        cell.setCellValue(value);
        return cell;
    }

    private static Cell setCellStyleWithValue(Cell cell, String value) {
        cell.setCellStyle(cellstyle);
        cell.setCellValue(value);
        return cell;
    }


    private static Cell setCellStyleWithStyleAndValue(CellStyle style, Cell cell, RichTextString value) {
        cell.setCellStyle(style);
        cell.setCellValue(value);
        return cell;
    }

    private static Cell setCellStyleWithValue(Cell cell, int value) {
        cell.setCellStyle(cellstyle);
        cell.setCellValue(value);
        return cell;
    }

    private static Cell setCellStyleWithValue(Cell cell, double value) {
        cell.setCellStyle(cellstyle);
        cell.setCellValue(value);
        return cell;
    }

    private static XSSFCellStyle createCellStyle(Workbook wb) {
        cellstyle = (XSSFCellStyle) wb.createCellStyle();
        cellstyle.setAlignment(XSSFCellStyle.ALIGN_CENTER);
//        cellstyle.setBorderBottom(XSSFCellStyle.BORDER_THIN);
//        cellstyle.setBorderLeft(XSSFCellStyle.BORDER_THIN);
//        cellstyle.setBorderRight(XSSFCellStyle.BORDER_THIN);
//        cellstyle.setBorderTop(XSSFCellStyle.BORDER_THIN);
        cellstyle.setVerticalAlignment(XSSFCellStyle.VERTICAL_CENTER);
        return cellstyle;
    }
}

我自己的空模板，有數據的圖就不貼出來了！

java後臺poi根據模板導出excel