easyExcel 將一列的單元格格式改為數值格式

依賴 
<dependency>
    <groupId>com.alibaba</groupId>
    <artifactId>easyexcel</artifactId>
    <version>2.1.6</version>
</dependency>

demo 比poi縮減了很多 ，真正的讀寫就一行就一行 

@PostMapping("/read")
 void readExcel(){
    read(new File("J:\\Xworkspace/demo.xlsx"), BankInfo.class,new DemoDataListener()).sheet().doRead();

}


@GetMapping("/write")
 void writeExcel(){

    List<BankInfo> bankInfos = bankService.fandAll();


  //   EasyExcel.write("D:\\demo666.xlsx", BankInfo.class).sheet("銀行").doWrite(bankInfos);

    System.out.println("1121--------------------");
    write("D:\\\\demo666.xlsx",BankInfo.class).sheet("銀行").registerWriteHandler(new RowWriteHandler()).doWrite(bankInfos);
}


@GetMapping("download")
public void download(HttpServletResponse response) throws IOException {
    List<BankInfo> bankInfos = bankService.fandAll();
    // 這里注意 有同學反應使用swagger 會導致各種問題，請直接用瀏覽器或者用postman
    response.setContentType("application/vnd.ms-excel");
    response.setCharacterEncoding("utf-8");
    // 這里URLEncoder.encode可以防止中文亂碼 當然和easyexcel沒有關系
    String fileName = URLEncoder.encode("測試", "UTF-8");
    response.setHeader("Content-disposition", "attachment;filename=" + fileName + ".xlsx");
    EasyExcel.write(response.getOutputStream(), BankInfo.class).sheet("模板").doWrite(bankInfos);
}


@PostMapping("upload")
@ResponseBody
public String upload(MultipartFile file) throws IOException {
    EasyExcel.read(file.getInputStream(), BankInfo.class, new UploadDataListener()).sheet().doRead();
    return "success";
}

需要修改就繼承相應的 監聽器或者自定義寫入父類

上面是簡單使用的demo

修改sheet格式 需要繼承 CellWriteHandler  在創建sheet頁后去使用該模板類  因為沒找到能改成數值格式，所以只能改成默認保留兩位小數的自定義格式代碼如下

public class RowWriteHandler implements CellWriteHandler {
    private HashMap<Integer, List<Integer>> map;

    public RowWriteHandler(HashMap<Integer, List<Integer>> map, Short colorIndex) {
        this.map = map;
    }

    public RowWriteHandler() {
    }

    @Override
    public void beforeCellCreate(WriteSheetHolder writeSheetHolder, WriteTableHolder writeTableHolder, Row row, Head head, Integer integer, Integer integer1, Boolean aBoolean) {

    }

    @Override
    public void afterCellCreate(WriteSheetHolder writeSheetHolder, WriteTableHolder writeTableHolder, Cell cell, Head head, Integer integer, Boolean aBoolean) {

        //當前行的第i列
        // int i = cell.getColumnIndex();
        //不處理第一行
        if (0 != cell.getRowIndex()) {
            if (2 == cell.getColumnIndex()) {
                Workbook workbook = writeSheetHolder.getSheet().getWorkbook();
                CellStyle cellStyle = workbook.createCellStyle();
                DataFormat dataFormat = workbook.createDataFormat();
                cellStyle.setDataFormat(HSSFDataFormat.getBuiltinFormat("0.00"));
                cell.setCellStyle(cellStyle);
            }
        }
    }

    //加@Override會報錯
    public void afterCellDataConverted(WriteSheetHolder writeSheetHolder, WriteTableHolder writeTableHolder, CellData cellData, Cell cell, Head head, Integer integer, Boolean aBoolean) {


    }

    @Override
    public void afterCellDispose(WriteSheetHolder writeSheetHolder, WriteTableHolder writeTableHolder, List<CellData> list, Cell cell, Head head, Integer integer, Boolean aBoolean) {

    }
}