java后台poi根据模板导出excel

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 {
        //模板的路径，这个在自己的项目中很容易弄错，相对位置一定要写对啊
        String psth = request.getRealPath("/") + INSPECTIONRECORD_SURFACE_TEMPLET_PATH;
        Workbook webBook = readExcel(psth);
        Sheet sheet = webBook.getSheetAt(0);
        //调用样式方法
        cellstyle = createCellStyle(webBook);
        sheet.setColumnWidth(0, 3766);//列宽
        sheet.setColumnWidth(1, 4766);//列宽
        //开始操作模板，找到某行某列（某个cell），需要注意的是这里有个坑，行和列的计数都是从0开始的
        //一次数据插入的位置不对，别灰心，多试几次就好啦，你要是能看懂我下面的代码，数据插在了什么位置，你就明白了
        //打印时间
        int rows = 0;
        Row row = sheet.getRow(rows);
        //调用方法，赋值并给定样式（写样式的时候这个工具类只能用XSSF而不能用HSSF,不然样式会没响应）
        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"));

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

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

        //在调用模板的时候，数据的插入不能直接应用模板行，不然数据会覆盖掉哪行
        rows = 7;
        row = sheet.createRow(rows);
        row.createCell(0).setCellValue("编号");
        row.createCell(1).setCellValue("名称");
        row.createCell(2).setCellValue("规格");
        row.createCell(3).setCellValue("数量");
        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("物料编号")));
            row.createCell(1).setCellValue(StringUtils.objToStr(list.get(i).get("物料名称")));
            row.createCell(2).setCellValue(StringUtils.objToStr(list.get(i).get("物料规格")));
            row.createCell(3).setCellValue(Double.parseDouble(StringUtils.objToStr(list.get(i).get("物料消耗数量"))));
            row.createCell(4).setCellValue(Float.parseFloat(StringUtils.objToStr(list.get(i).get("物料消耗损益值"))));*/

            setCellStyleWithValue(row.createCell(0),StringUtils.objToStr(list.get(i).get("物料编号")));
            setCellStyleWithValue(row.createCell(1),StringUtils.objToStr(list.get(i).get("物料名称")));
            setCellStyleWithValue(row.createCell(2),StringUtils.objToStr(list.get(i).get("物料规格")));
            setCellStyleWithValue(row.createCell(3),Double.parseDouble(StringUtils.objToStr(list.get(i).get("物料消耗数量"))));
            setCellStyleWithValue(row.createCell(4),Float.parseFloat(StringUtils.objToStr(list.get(i).get("物料消耗损益值"))));

        }
        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("文件路径错误");
            e.printStackTrace();
        } catch (IOException e) {
            System.out.println("文件输入流错误");
            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("输出流错误");
            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，有数据的图就不贴出来了！