Can not find ‘Converter‘ support class List问题解决

问题描述

com.alibaba.excel.exception.ExcelDataConvertException: Can not find ‘Converter’ support class List.

问题解释

EasyExcel开源框架中Converter接口的convertToExcelData只实现了转换BigDecimal、Bolean、Byte[]、btye[]、Byte、Date、Double、File、Float、InputStream、Integer、Long、Short、URL这些类型，意味着参数data最多只能是个二维数据，但是本次业务逻辑需要转换List< String >的数据。

实体类数据

	/**
     * 名下企业名称
     */
    @ExcelProperty(value = "名下企业名称",index = 12)
    private List enterpriseList;

解决办法

编写自定义Converter转换器：

@Component
public class ListConverter implements Converter {
    @Override
    public Class supportJavaTypeKey() {
        return List.class;
    }

    @Override
    public CellDataTypeEnum supportExcelTypeKey() {
        return CellDataTypeEnum.STRING;
    }

    @Override
    public List convertToJavaData(CellData cellData, ExcelContentProperty excelContentProperty, GlobalConfiguration globalConfiguration) throws Exception {
        String stringValue = cellData.getStringValue();
        String[] split = stringValue.split(",");
        List enterpriseList = new ArrayList<>();
        for(int i = 0; i < split.length; i++){
            enterpriseList.add(split[i]);
        }
        return enterpriseList;
    }

    @Override
    public CellData convertToExcelData(List list, ExcelContentProperty excelContentProperty, GlobalConfiguration globalConfiguration) throws Exception {
        StringBuilder stringBuilder = new StringBuilder();
        list.forEach(o -> {
            String s = o.toString();
            stringBuilder.append(s+",");
        });
        return new CellData(stringBuilder.toString());
    }
}