【question】Reader读取Excel的时候遇到null值不处理 converter

[xkcoding]

测试代码：

测试导出，模拟测试数据

@Test
public void testWriter() throws WriterException {
    String fileName = "/Users/yangkai.shen/Desktop/模板.xlsx";
    List<TalendModel> rows = Lists.newArrayList(new TalendModel("1","1","1","1","1",true,"1","1"),new TalendModel("1","1","1","1","1",false,"1","1"),new TalendModel("1","1","1","1","1",null,"1","1"));
    Writer.create(ExcelType.XLSX).withRows(rows).headerStyle((book, style) -> {
        style.setFillBackgroundColor(HSSFColor.HSSFColorPredefined.ORANGE.getIndex());
        return style;
    }).to(new File(fileName));
}

测试导入

@Test
public void testReader() {
    String fileName = "/Users/yangkai.shen/Desktop/模板.xlsx";
    List<TalendModel> talendModels = Reader.create(TalendModel.class)
            .from(new File(fileName))
            .sheet(0)
            .start(1)
            .asList();
    talendModels.forEach(System.out::println);
}

实体类代码

@Data
@NoArgsConstructor
@AllArgsConstructor
public class TalendModel {
    /**
     * 表中文名
     */
    @ExcelColumn(title = "表中文名", index = 0)
    private String tableChineseName;
    /**
     * 表英文名
     */
    @ExcelColumn(title = "表英文名", index = 1)
    private String tableEnglishName;
    /**
     * 字段中文名
     */
    @ExcelColumn(title = "字段中文名", index = 2)
    private String columnChineseName;
    /**
     * 字段英文名
     */
    @ExcelColumn(title = "字段英文名", index = 3)
    private String columnEnglishName;
    /**
     * 字段数据类型
     */
    @ExcelColumn(title = "字段数据类型", index = 4)
    private String columnDataType;
    /**
     * 主键
     */
    @ExcelColumn(title = "主键", index = 5, converter = PrimaryKeyConverter.class)
    private Boolean primaryKey;
    /**
     * 关联外键表
     */
    @ExcelColumn(title = "关联外键表", index = 6)
    private String foreignTableName;
    /**
     * 外键关联表字段
     */
    @ExcelColumn(title = "外键关联表字段", index = 7)
    private String foreignColumnName;
}

类型转换Converter代码

public class PrimaryKeyConverter implements Converter<String, Boolean> {
    @Override
    public Boolean stringToR(String value) {
        if (StrUtil.isNotBlank(value) && StrUtil.equals("Y", value)) {
            return true;
        }
        return false;
    }

    @Override
    public String toString(Boolean fieldValue) {
        if (fieldValue) {
            return "Y";
        }
        return "";
    }
}

遇到的问题：
Reader解析到 primaryKey 为 null 的时候不执行 PrimaryKeyConverter#stringToR()，导致 Boolean 会出现 null 值

另外还有以下一些问题：

1. Writer 还存着一个问题，就是headerStyle样式好像并没有生效。
2. Writer 写出的时候，能否将 withRows非必要条件，比如我只想导出一个模板，包含 实体类的字段信息，我直接导出实体类就行，没必要设置行数。
   建议添加个class参数如下：

Writer.create(ExcelType.XLSX).class(TalendModel.class).headerStyle((book, style) -> {
        style.setFillBackgroundColor(HSSFColor.HSSFColorPredefined.ORANGE.getIndex());
        return style;
    }).to(new File(fileName));