这里就简单说了，直接贴代码

@HeadFontStyle(color =2) 维护表头第2行的注解

/**

* @author： kuangql@fadada.com

* @date： 2020/11/27 19:53

* @description： TODO

*/

@Data

public class DemoExportEntity {

public static final String bigTitle= "填写须知： \n" +

"1.第1、2行为固定结构，不可更改；以下示例行，导入前请先删除\n" +

"2.请严格按照填写规则输入数据，不合规的数据无法成功导入 \n" +

"3.测试换行 \n";

/**

*

* org.apache.poi.ss.usermodel.IndexedColors 这个类有所有的颜色枚举值 2是红色

* @ HeadFontStyle 注解默认是宋体，黑色，加粗

*

*/

@ExcelProperty(value = {"姓名(必填)"}, index = 0)

@ColumnWidth(30)

@HeadFontStyle(color =2)

private String userName;

@ExcelProperty(value = {"性别(必填)"}, index = 1)

@ColumnWidth(20)

private String userSexName;

@ExcelProperty(value = {"手机号码(必填)"}, index = 2)

@ColumnWidth(30)

private String userMobile;

@ExcelProperty(value = {"出生年月(必填)"}, index = 3)

@ColumnWidth(30)

private String userBirthday;

@ExcelProperty(value = {"工作单位(必填)"}, index = 4)

@ColumnWidth(20)

private String deptName;

@ExcelProperty(value = {"职务(必填)"}, index = 5)

@ColumnWidth(20)

private String unitPosition;

@ExcelProperty(value = {"干部类别(必填)"}, index = 6)

@ColumnWidth(20)

private String leaderTypeName;

@ExcelProperty(value = {"用户状态(必填)"}, index = 7)

@ColumnWidth(20)

private String userStatusName;

/**

* 每个模板的首行高度， 换行数目+2 乘以400

*/

public static int getHeadHeight(){

return (StringUtils.getCharCounts(bigTitle,"\n")+2)*400;

}

}

维护第一行表头样式

/**

*

*

* 创建模板

* @author： kuangql@fadada.com

* @date： 2020/11/30 13:48

* @description： TODO

*/

public class CreateTemplateWriteHandler implements SheetWriteHandler {

/**

* 第一行内容

*/

private String firstTitle;

/**

* 实体模板类的行高

*/

private int height;

/**

* 实体类 最大的列坐标 从0开始算

*/

private int lastCellIndex;

public CreateTemplateWriteHandler(String firstTitle, int height, int cellCounts) {

this.firstTitle = firstTitle;

this.height = height;

this.lastCellIndex = cellCounts;

}

@Override

public void beforeSheetCreate(WriteWorkbookHolder writeWorkbookHolder, WriteSheetHolder writeSheetHolder) {

}

@Override

public void afterSheetCreate(WriteWorkbookHolder writeWorkbookHolder, WriteSheetHolder writeSheetHolder) {

Workbook workbook = writeWorkbookHolder.getWorkbook();

Sheet sheet = workbook.getSheetAt(0);

Row row1 = sheet.createRow(0);

row1.setHeight((short) height);

//字体样式

Font font = workbook.createFont();

font.setColor((short)2);

Cell cell = row1.createCell(0);

//单元格样式

CellStyle cellStyle = workbook.createCellStyle();

cellStyle.setVerticalAlignment(VerticalAlignment.CENTER);

cellStyle.setAlignment(HorizontalAlignment.CENTER);

cellStyle.setFont(font);

cellStyle.setWrapText(true);

cell.setCellStyle(cellStyle);

//设置单元格内容

cell.setCellValue(firstTitle);

//合并单元格 --> 起始行， 终止行 ，起始列，终止列

sheet.addMergedRegionUnsafe(new CellRangeAddress(0, 0, 0, lastCellIndex));

}

/**

* 根据实体类生成模板

*

* @param response

* @param fileName 下 载的文件名，

* @param sheetName sheet名

* @param model 实体类

* @param height 第一行行高

* @param title 第一行表头内容

* @param lastCellIndex 列数

*/

public static void createTemplate(HttpServletResponse response, String fileName,

String sheetName,

Class> model, int height, String title, int lastCellIndex) {

EasyExcel.write(getOutputStream(fileName, response, ExcelTypeEnum.XLSX), model).

excelType(ExcelTypeEnum.XLSX).sheet(sheetName)

.registerWriteHandler(new CreateTemplateWriteHandler(title, height, lastCellIndex))

.head(model)

.useDefaultStyle(true).relativeHeadRowIndex(1)

.doWrite(null);

}