easyexcel使用

https://www.yuque.com/easyexcel/doc/write#xuM8l这里面写的非常清楚

@Data
@ApiModel("导出Excel")
@HeadStyle(fillForegroundColor = 22)
@HeadFontStyle(fontHeightInPoints = 10)
@ColumnWidth(value = 13) // 列宽
public class DetailResultExcelVo {
@ExcelProperty(value = {"保险","规则"},converter = BaseRoundRuleConverter.class)
    @ApiModelProperty(value = "规则")
    private Byte baseRoundRule;
}

　　

 try {
　　　　//"Content-Disposition","attachment;这个是说页面自动下载
　　　　response.addHeader("Content-Disposition","attachment; filename="+ java.net.URLEncoder.encode(name, "UTF-8"));
       response.setContentType("application/vnd.openxmlformats-officedocument.spreadsheetml.sheet");
       response.setCharacterEncoding("utf-8");
       String fileName = URLEncoder.encode(name, StandardCharsets.UTF_8);
       // 这里需要设置不关闭流
       EasyExcel.write(response.getOutputStream(), clazz).registerWriteHandler(new LongestMatchColumnWidthStyleStrategy()).sheet("Sheet")
                    .doWrite(list);
       EasyExcel.write(name, clazz).sheet().doWrite(list);
 } catch (Exception e) {
      //ResultData.error("下载文件失败");
       response.getWriter().println(JsonUtils.toJson(resultData));
  }

//处理当数据为-1时Excel显示空单元格
public class SpecialDataConverter implements Converter<Number> {
    @Override
    public Class supportJavaTypeKey() {
        return null;
    }

    @Override
    public CellDataTypeEnum supportExcelTypeKey() {
        return null;
    }

    @Override
    public Byte convertToJavaData(CellData cellData, ExcelContentProperty contentProperty, GlobalConfiguration globalConfiguration) throws Exception {
        return null;
    }

    @Override
    public CellData convertToExcelData(Number value, ExcelContentProperty contentProperty, GlobalConfiguration globalConfiguration) throws Exception {
　　//当传过来的value是Integer,value.equals(-1)生效,发现value是Long型不生效,所以加上了value.longValue()==-1
　　//new CellData(value),value是Number类型报错,所以转为value.toString()
 　　if(value.equals(-1)||value.longValue()==-1){
            return new CellData("");
        }
        return new CellData(value.toString());
    }
}

//Converter例子
@Getter
@ToString
@ApiModel("转换器")
public class RuleConverter  implements  Converter<Byte> {
    @Override
    public Class supportJavaTypeKey() {
        return null;
    }

    @Override
    public CellDataTypeEnum supportExcelTypeKey() {
        return null;
    }

    @Override
    public Byte convertToJavaData(CellData cellData, ExcelContentProperty excelContentProperty, GlobalConfiguration globalConfiguration) throws Exception {
        return null;
    }

    @Override
    public CellData convertToExcelData(Byte aByte, ExcelContentProperty excelContentProperty, GlobalConfiguration globalConfiguration) throws Exception {
        String name = RuleEnum.getNameByCode(aByte);
        return new CellData(name);
    }
}