@ContentLoopMerge

用于设置合并单元格的注解，作用于字段上

1. eachRow：每隔几行合并
2. columnExtend：合并列的下标

@AllArgsConstructor
@NoArgsConstructor
@Data
public class User {

    @ContentLoopMerge(eachRow = 2, columnExtend = 1)
    @ExcelProperty(value = "用户Id")
    private Integer userId;

    @ExcelProperty(value = "姓名")
    private String name;

    @ExcelProperty(value = "手机")
    private String phone;

    @ExcelProperty(value = "邮箱")
    private String email;

    @ExcelProperty(value = "创建时间")
    private Date createTime;
}

@OnceAbsoluteMerge

用于指定位置的单元格合并，作用于类上

1. firstRowIndex：第一行下标
2. lastRowIndex：最后一行下标
3. firstColumnIndex：第一列下标
4. lastColumnIndex：最后一列下标

@OnceAbsoluteMerge(firstColumnIndex = 0, lastColumnIndex = 0, firstRowIndex = 1, lastRowIndex = 2)
@AllArgsConstructor
@NoArgsConstructor
@Data
public class User {

    @ExcelProperty(value = "用户Id")
    private Integer userId;

    @ExcelProperty(value = "姓名")
    private String name;

    @ExcelProperty(value = "手机")
    private String phone;

    @ExcelProperty(value = "邮箱")
    private String email;

    @ExcelProperty(value = "创建时间")
    private Date createTime;
}