因为这里是用注解实现的,只有到三级表头,如果表头超过了三级,比如有四级、五级的话,就不建议用注解,还是用模板比较方便。
多级表头一个是可以用注解实现:@ExcelCollection 和 @Excel 组合使用;还有就是可以用模板实现;还有一种就是用原生poi写,这个就更麻烦了。模板实现就更灵活,很复杂的表格都可以实现,不过就是填充数据比较麻烦。这里先写用注解实现的方式。
import cn.afterturn.easypoi.excel.annotation.Excel;
import cn.afterturn.easypoi.excel.annotation.ExcelCollection;
import lombok.Data;
import java.util.List;
@Data
public class ExcelExportVo {
// 这两个就是一级表头,最后一级表头对应的是具体的某个属性,它们都是被包裹在一级表头下的
@ExcelCollection(name = "用户信息")
private List<UserInfo> userInfoList;
@ExcelCollection(name = "用户角色和权限")
private List<RoleInfo> roleInfoList;
/**
* 用户信息
*/
@Data
public static class UserInfo{
// 二级表头可以用 groupName 实现
@Excel(name = "用户账号",width = 20,groupName = "基本信息")
private String userName;
@Excel(name = "用户姓名",width = 20,groupName = "基本信息")
private String realName;
@Excel(name = "手机号码",width = 20,groupName = "基本信息")
private String phone;
@Excel(name = "所在公司",width = 20,groupName = "单位部门")
private String com;
@Excel(name = "所在部门",width = 20,groupName = "单位部门")
private String dept;
public UserInfo(String userName, String realName, String phone, String com, String dept) {
this.userName = userName;
this.realName = realName;
this.phone = phone;
this.com = com;
this.dept = dept;
}
}
/**
* 用户角色权限
*/
@Data
public static class RoleInfo{
@Excel(name = "所属角色名称",width = 20,groupName = "角色")
private String roleName;
@Excel(name = "所属角色代码",width = 20,groupName = "角色")
private String roleCode;
@Excel(name = "菜单权限",width = 40,groupName = "权限")
private String menu;
@Excel(name = "数据权限",width = 40,groupName = "权限")
private String data;
public RoleInfo(String roleName, String roleCode, String menu, String data) {
this.roleName = roleName;
this.roleCode = roleCode;
this.menu = menu;
this.data = data;
}
}
}
import cn.afterturn.easypoi.excel.ExcelExportUtil;
import cn.afterturn.easypoi.excel.ExcelImportUtil;
import cn.afterturn.easypoi.excel.annotation.Excel;
import cn.afterturn.easypoi.excel.entity.ExportParams;
import cn.afterturn.easypoi.excel.entity.ImportParams;
import cn.afterturn.easypoi.excel.entity.enmus.ExcelType;
import cn.afterturn.easypoi.excel.entity.params.ExcelExportEntity;
import cn.afterturn.easypoi.excel.entity.result.ExcelImportResult;
import cn.afterturn.easypoi.excel.imports.ExcelImportService;
import org.apache.commons.lang3.StringUtils;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.ss.usermodel.*;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;
import org.springframework.web.multipart.MultipartFile;
import sun.misc.BASE64Decoder;
import javax.imageio.ImageIO;
import javax.servlet.http.HttpServletResponse;
import java.awt.image.BufferedImage;
import java.io.*;
import java.lang.reflect.Field;
import java.net.URLEncoder;
import java.util.*;
/**
* excel操作工具类
*/
public class ExcelUtil {
/**
* 偶数行设置背景色
*/
private static void setRowBackground(Workbook workbook){
Sheet sheet = workbook.getSheetAt(0);
CellStyle styles = ExcelStyleUtil.getStyles(workbook,false,(short) 12);
for(int i = 0; i <= sheet.getLastRowNum(); i ++) {
Row row = sheet.getRow(i);
if (i%2==0){
for(int j = 0; j < row.getPhysicalNumberOfCells(); j ++) {
Cell cell = row.getCell(j);
cell.setCellStyle(styles);
}
}
}
}
/**
* 导出设置隔行背景色
* @param params 导出参数
* @param list 数据
* @param pojoClass pojo类型
* @param fileName 文件名称
* @param isSetRowBackground 是否设置隔行背景色
*/
public static void exportExcel(ExportParams params, List<?> list, Class<?> pojoClass, String fileName,boolean isSetRowBackground, HttpServletResponse response){
Workbook workbook = ExcelExportUtil.exportExcel(params,pojoClass,list);
if (workbook != null);
if (isSetRowBackground) setRowBackground(workbook);
downLoadExcel(fileName, response, workbook);
}
/**
* excel 导出
* @param list 数据
* @param title 标题
* @param sheetName sheet名称
* @param pojoClass pojo类型
* @param fileName 文件名称
*/
public static void exportExcel(List<?> list, String title, String sheetName, Class<?> pojoClass, String fileName, HttpServletResponse response){
ExportParams exportParams = new ExportParams(title, sheetName, ExcelType.XSSF);
exportParams.setStyle(ExcelStyleUtil.class);
defaultExport(list, pojoClass, fileName, response, exportParams);
}
/**
* excel 导出
* @param list 数据
* @param pojoClass pojo类型
* @param fileName 文件名称
*/
public static void exportExcel(List<?> list, Class<?> pojoClass, String fileName, HttpServletResponse response){
ExportParams exportParams = new ExportParams();
exportParams.setStyle(ExcelStyleUtil.class);
defaultExport(list, pojoClass, fileName, response, exportParams);
}
/**
* list map 导出
* @param list 数据
* @param fileName 文件名称
*/
public static void exportExcel(List<Map<String, Object>> list, String fileName, HttpServletResponse response){
ExportParams exportParams = new ExportParams();
exportParams.setStyle(ExcelStyleUtil.class);
defaultExport(list, fileName, response);
}
/**
* 默认的 excel 导出
* @param list 数据
* @param pojoClass pojo类型
* @param fileName 文件名称
* @param exportParams 导出参数
*/
private static void defaultExport(List<?> list, Class<?> pojoClass, String fileName, HttpServletResponse response, ExportParams exportParams){
Workbook workbook = ExcelExportUtil.exportExcel(exportParams, pojoClass, list);
downLoadExcel(fileName, response, workbook);
}
/**
* 默认的 excel 导出
* @param list 数据
* @param fileName 文件名称
*/
private static void defaultExport(List<Map<String, Object>> list, String fileName, HttpServletResponse response){
Workbook workbook = ExcelExportUtil.exportExcel(list, ExcelType.XSSF);
downLoadExcel(fileName, response, workbook);
}
/**
* 下载
* @param fileName 文件名称
* @param response
* @param workbook excel数据
*/
public static void downLoadExcel(String fileName, HttpServletResponse response, Workbook workbook){
try {
response.setCharacterEncoding("UTF-8");
response.setHeader("content-Type", "application/vnd.ms-excel");
response.setHeader("Content-Disposition", "attachment;filename=" + URLEncoder.encode(fileName + "." + ExcelTypeEnum.XLS.getValue(), "UTF-8"));
workbook.write(response.getOutputStream());
} catch (IOException e) {
e.printStackTrace();
}
}
/**
* excel 导入
* @param filePath excel文件路径
* @param titleRows 标题行
* @param headerRows 表头行
* @param pojoClass pojo类型
*/
public static <T> List<T> importExcel(String filePath, Integer titleRows, Integer headerRows, Class<T> pojoClass) throws IOException {
if (StringUtils.isBlank(filePath)) {
return null;
}
ImportParams params = new ImportParams();
params.setTitleRows(titleRows);
params.setHeadRows(headerRows);
params.setNeedSave(true);
params.setSaveUrl("/excel/");
try {
return ExcelImportUtil.importExcel(new File(filePath), pojoClass, params);
} catch (NoSuchElementException e) {
throw new IOException("模板不能为空");
} catch (Exception e) {
throw new IOException(e.getMessage());
}
}
/**
* excel 导入
* @param file 上传的文件
* @param titleRows 标题行
* @param headerRows 表头行
* @param needVerify 是否检验excel内容
* @param pojoClass pojo类型
*/
public static <T> List<T> importExcel(MultipartFile file, Integer titleRows, Integer headerRows, boolean needVerify, Class<T> pojoClass) throws IOException {
if (file == null) {
return null;
}
try {
return importExcel(file.getInputStream(), titleRows, headerRows, needVerify, pojoClass);
} catch (Exception e) {
throw new IOException(e.getMessage());
}
}
/**
* excel 导入
* @param inputStream 文件输入流
* @param titleRows 标题行
* @param headerRows 表头行
* @param needVerify 是否检验excel内容
* @param pojoClass pojo类型
*/
public static <T> List<T> importExcel(InputStream inputStream, Integer titleRows, Integer headerRows, boolean needVerify, Class<T> pojoClass) throws IOException {
if (inputStream == null) {
return null;
}
ImportParams params = new ImportParams();
params.setTitleRows(titleRows);
params.setHeadRows(headerRows);
params.setSaveUrl("upload/excel/");
params.setNeedSave(true);
params.setNeedVerify(needVerify);
try {
return ExcelImportUtil.importExcel(inputStream, pojoClass, params);
} catch (NoSuchElementException e) {
throw new IOException("excel文件不能为空");
} catch (Exception e) {
throw new IOException(e.getMessage());
}
}
/**
* Excel 类型枚举
*/
enum ExcelTypeEnum {
XLS("xls"), XLSX("xlsx");
private String value;
ExcelTypeEnum(String value) {
this.value = value;
}
public String getValue() {
return value;
}
public void setValue(String value) {
this.value = value;
}
}
/**
* 上传文件,返回一个workbook
* @param file
*/
public static Workbook importExcel(MultipartFile file) throws IOException {
File toFile = new File(file.getOriginalFilename());
Workbook workbook = null;
if(toFile.getPath().endsWith("xls")){
workbook = new HSSFWorkbook(file.getInputStream());
}else if(toFile.getPath().endsWith("xlsx")){
workbook = new XSSFWorkbook(file.getInputStream());
}else {
throw new RuntimeException("请确认你上传的文件类型");
}
return workbook;
}
/**
* 读取指定sheet的数据
* @param file 上传的文件
* @param sheetName 要读取的sheetName
* @param titleRows 表头行数
* @param headRows 标题行数
* @param startRows 表头之前有多少行不要的数据,从1开始,忽略空行
* @param readRows 要读取多少行数据,从0开始,比如读取十行,值就是9; 不指定时默认为0
* @param pojoClass 实体
*/
public static <T> List<T> importExcel(MultipartFile file,String sheetName,Integer titleRows,Integer headRows, Integer startRows,Integer readRows,Class<T> pojoClass) throws Exception {
Workbook workbook = importExcel(file);
int numberOfSheets = workbook.getNumberOfSheets();
List<T> list = null;
for (int i = 0; i < numberOfSheets; i++) {
String name = workbook.getSheetName(i).trim();
if (name.equals(sheetName) || name.endsWith(sheetName)){
ImportParams params = new ImportParams();
params.setTitleRows(titleRows);
params.setHeadRows(headRows);
params.setStartRows(startRows);
params.setReadRows(readRows);
//第几个sheet页
params.setStartSheetIndex(i);
final ExcelImportService excelImportService = new ExcelImportService();
ExcelImportResult<T> result = excelImportService.importExcelByIs(file.getInputStream(), pojoClass, params, false);
list = result.getList();
break;
}
}
return list;
}
/**
* 以map的形式导出表格
* @param list 数据
*/
public static <T> List<Map<String, Object>> objectToMap(List<T> list){
List<Map<String, Object>> result = new ArrayList<>();
Map<String, Object> map = null;
try {
for (T item : list) {
map = new HashMap<>();
Class<?> clazz = item.getClass();
for (Field field : clazz.getDeclaredFields()) {
field.setAccessible(true);
String fieldName = field.getName();
Object value = field.get(item);
map.put(fieldName, value);
}
result.add(map);
}
return result;
}catch (IllegalAccessException e){
e.printStackTrace();
}
return null;
}
/**
* 动态导出列,根据Excel注解获取列的字段注释(表头名)、宽度
* @param clazz
* @param fields 选择要导出的列
*/
public static List<ExcelExportEntity> dynamicExport(Class<?> clazz,String fields) {
List<ExcelExportEntity> beanList = new ArrayList<>();
String[] split = fields.split(",");
int length = split.length;
try {
for (int i = 0; i < length; i++) {
Field f = clazz.getDeclaredField(split[i]);
Excel annotation = f.getAnnotation((Excel.class));
String comment = annotation.name();
Double width = annotation.width();
beanList.add(new ExcelExportEntity(comment, f.getName(),width.intValue()));
}
}catch (NoSuchFieldException e){
e.printStackTrace();
}
return beanList;
}
/**
* 导出Excel,并在最后追加图片
* @param sheetName sheet名称
* @param wb HSSFWorkbook对象
*/
public static Workbook getWorkbook(String sheetName,Workbook wb, String imgUrl) throws IOException {
// 第一步,创建一个HSSFWorkbook,对应一个Excel文件
if (wb == null) {
wb = new HSSFWorkbook();
}
// 第二步,在workbook中添加一个sheet,对应Excel文件中的sheet
Sheet sheet = wb.getSheet(sheetName);
/*生成图表*/
if(!StringUtils.isEmpty(imgUrl)) {
String[] imgUrlArr = imgUrl.split("base64,");//拆分base64编码后部分
byte[] buffer = new BASE64Decoder().decodeBuffer(imgUrlArr[1]);
String picPath = System.getProperty("user.dir")+"\\upload\\image\\pic.png";
File file = new File(picPath);//图片文件
try {
//生成图片
OutputStream out = new FileOutputStream(file);//图片输出流
out.write(buffer);
out.flush();//清空流
out.close();//关闭流
ByteArrayOutputStream outStream = new ByteArrayOutputStream(); // 将图片写入流中
BufferedImage bufferImg = ImageIO.read(new File(picPath));
ImageIO.write(bufferImg, "PNG", outStream);
// 利用HSSFPatriarch将图片写入EXCEL
Drawing<?> drawing = sheet.createDrawingPatriarch();
//位置:第1个单元格中x轴的偏移量、第1个单元格中y轴的偏移量、 第2个单元格中x轴的偏移量、 第2个单元格中y轴的偏移量、第1个单元格的列号、第1个单元格的行号、 第2个单元格的列号、第2个单元格的行号
//HSSFClientAnchor anchor = new HSSFClientAnchor(0, 0, 0, 0, (short) 0, 8, (short) 10, 40);
ClientAnchor anchor = drawing.createAnchor(0, 0, 0, 0, 0, 6, 9, 40);
drawing.createPicture(anchor, wb.addPicture(outStream.toByteArray(), HSSFWorkbook.PICTURE_TYPE_PNG));
} catch (Exception ex) {
ex.printStackTrace();
}
if (file.exists()) {
file.delete();//删除图片
}
}
return wb;
}
}
import cn.afterturn.easypoi.excel.entity.params.ExcelExportEntity;
import cn.afterturn.easypoi.excel.entity.params.ExcelForEachParams;
import cn.afterturn.easypoi.excel.export.styler.IExcelExportStyler;
import org.apache.poi.ss.usermodel.*;
/**
* excel导出样式设置工具类
*/
public class ExcelStyleUtil implements IExcelExportStyler {
private static final short STRING_FORMAT = (short) BuiltinFormats.getBuiltinFormat("TEXT");
private static final short FONT_SIZE_TEN = 12;
private static final short FONT_SIZE_ELEVEN = 14;
private static final short FONT_SIZE_TWELVE = 18;
/**
* 大标题样式
*/
private CellStyle headerStyle;
/**
* 每列标题样式
*/
private CellStyle titleStyle;
/**
* 数据行样式
*/
private CellStyle styles;
public ExcelStyleUtil(Workbook workbook) {
this.init(workbook);
}
/**
* 初始化样式
* @param workbook
*/
private void init(Workbook workbook) {
this.headerStyle = initHeaderStyle(workbook);
this.titleStyle = initTitleStyle(workbook,true,FONT_SIZE_ELEVEN);
this.styles = initStyles(workbook);
}
@Override
public CellStyle getHeaderStyle(short i) {
return headerStyle;
}
@Override
public CellStyle getTitleStyle(short i) {
return titleStyle;
}
@Override
public CellStyle getTemplateStyles(boolean b, ExcelForEachParams excelForEachParams) {
return null;
}
@Override
public CellStyle getStyles(boolean b, ExcelExportEntity excelExportEntity) {
return styles;
}
@Override
public CellStyle getStyles(Cell cell, int i, ExcelExportEntity entity, Object o, Object o1) {
return getStyles(true, entity);
}
/**
* 设置隔行背景色
*/
public static CellStyle getStyles(Workbook workbook,boolean isBold,short size) {
CellStyle style = initTitleStyle(workbook,isBold,size);
style.setDataFormat(STRING_FORMAT);
return style;
}
/**
* 初始化--大标题样式
*/
private static CellStyle initHeaderStyle(Workbook workbook) {
CellStyle style = getBaseCellStyle(workbook);
style.setFont(getFont(workbook, FONT_SIZE_TWELVE, true));
return style;
}
/**
* 初始化--每列标题样式
*/
private static CellStyle initTitleStyle(Workbook workbook,boolean isBold,short size) {
CellStyle style = getBaseCellStyle(workbook);
style.setFont(getFont(workbook, size, isBold));
//背景色
style.setFillForegroundColor(IndexedColors.GREY_25_PERCENT.getIndex());
style.setFillPattern(FillPatternType.SOLID_FOREGROUND);
return style;
}
/**
* 初始化--数据行样式
*/
private static CellStyle initStyles(Workbook workbook) {
CellStyle style = getBaseCellStyle(workbook);
style.setFont(getFont(workbook, FONT_SIZE_TEN, false));
style.setDataFormat(STRING_FORMAT);
return style;
}
/**
* 基础样式
*/
private static CellStyle getBaseCellStyle(Workbook workbook) {
CellStyle style = workbook.createCellStyle();
//下边框
style.setBorderBottom(BorderStyle.THIN);
//左边框
style.setBorderLeft(BorderStyle.THIN);
//上边框
style.setBorderTop(BorderStyle.THIN);
//右边框
style.setBorderRight(BorderStyle.THIN);
//水平居中
style.setAlignment(HorizontalAlignment.CENTER);
//上下居中
style.setVerticalAlignment(VerticalAlignment.CENTER);
//设置自动换行
style.setWrapText(true);
return style;
}
/**
* 字体样式
* @param size 字体大小
* @param isBold 是否加粗
*/
private static Font getFont(Workbook workbook, short size, boolean isBold) {
Font font = workbook.createFont();
//字体样式
font.setFontName("宋体");
//是否加粗
font.setBold(isBold);
//字体大小
font.setFontHeightInPoints(size);
return font;
}
}
import cn.afterturn.easypoi.excel.ExcelExportUtil;
import cn.afterturn.easypoi.excel.entity.ExportParams;
import cn.afterturn.easypoi.excel.entity.enmus.ExcelType;
import com.common.util.ExcelStyleUtil;
import com.common.util.ExcelUtil;
import com.entity.sys.query.ExcelExportVo;
import org.apache.poi.ss.usermodel.Workbook;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import javax.servlet.http.HttpServletResponse;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
@RestController
@RequestMapping("/api/test")
public class TestController {
/**
* 多级表头、多个sheet导出
*/
@RequestMapping("/export")
public void export(HttpServletResponse response){
// 模拟数据
List<ExcelExportVo> dataList = new ArrayList<>();
List<ExcelExportVo.UserInfo> userInfoList = new ArrayList<>();
List<ExcelExportVo.RoleInfo> roleInfoList = new ArrayList<>();
userInfoList.add(new ExcelExportVo.UserInfo("chenyi","陈仪","12345678910","战神联盟","科研部"));
userInfoList.add(new ExcelExportVo.UserInfo("honger","洪洱","13241220000","前途有限公司","市场部"));
userInfoList.add(new ExcelExportVo.UserInfo("zhangsan","张三","12544445555","前途有限公司","研发部"));
userInfoList.add(new ExcelExportVo.UserInfo("lisi","李四","13125223561","战神联盟","科研部"));
userInfoList.add(new ExcelExportVo.UserInfo("wangwu","王五","15423226355","战神联盟","销售部"));
roleInfoList.add(new ExcelExportVo.RoleInfo("经理","JL","sys,dept,role,menu","view,add,update,delete"));
roleInfoList.add(new ExcelExportVo.RoleInfo("经理","JL","sys,dept,role,menu","view,add,update,delete"));
roleInfoList.add(new ExcelExportVo.RoleInfo("组长","ZZ","role,menu","view,add,update"));
roleInfoList.add(new ExcelExportVo.RoleInfo("普通","PT","menu","view,add"));
roleInfoList.add(new ExcelExportVo.RoleInfo("普通","PT","menu","view,add"));
ExcelExportVo vo = new ExcelExportVo();
vo.setUserInfoList(userInfoList);
vo.setRoleInfoList(roleInfoList);
dataList.add(vo);
// 第一个sheet
ExportParams params1 = new ExportParams();
params1.setStyle(ExcelStyleUtil.class);
params1.setSheetName("用户信息1");
params1.setTitle("用户信息");
Map<String, Object> params1Map = new HashMap<>();
params1Map.put("title", params1);
params1Map.put("entity", ExcelExportVo.class);
params1Map.put("data", dataList);
// 第二个sheet
ExportParams params2 = new ExportParams();
params2.setStyle(ExcelStyleUtil.class);
params2.setSheetName("用户信息2");
Map<String, Object> params2Map = new HashMap<>();
params2Map.put("title", params2);
params2Map.put("entity", ExcelExportVo.class);
params2Map.put("data", new ArrayList<>());
// 第三个sheet
ExportParams params3 = new ExportParams();
params3.setStyle(ExcelStyleUtil.class);
params3.setSheetName("用户信息3");
Map<String, Object> params3Map = new HashMap<>();
params3Map.put("title", params3);
params3Map.put("entity", ExcelExportVo.class);
params3Map.put("data", new ArrayList<>());
// 将3个sheet封装
List<Map<String, Object>> sheetsList = new ArrayList<>();
sheetsList.add(params1Map);
sheetsList.add(params2Map);
sheetsList.add(params3Map);
Workbook workBook = ExcelExportUtil.exportExcel(sheetsList, ExcelType.HSSF);
ExcelUtil.downLoadExcel("用户信息",response,workBook);
}
}
关于模板导出,其他倒没什么,主要是填充数据比较麻烦,此外还有一个要注意的点,就是关于数据横向遍历,也就是列遍历,就是新建列而不是新建行。
横向遍历,模板的语法是用 #fe,然后还需要在代码中手动开启列遍历。(之前我看文档上写的这个语法是横向遍历的,但是我用了一直不起作用,后面找啊找,终于在网上找到原因了)
{{#fe:headList t.name }}
String excelPath = System.getProperty("user.dir")+"\\src\\main\\resources\\template\\1.xls";
TemplateExportParams params = new TemplateExportParams(excelPath);
// 就是这一句,必须要设置为 true
params.setColForEach(true);
就是有的时候有某列或者某几列不符合条件,不要导出。
举个🌰:
1、就比如有两个页面,它们的数据来源、字段其实都是一个表的,但是因为有一些条件,页面1只展示符合条件xx的数据,页面2只展示符合条件xxx的数据,而且展示的字段也不尽相同;
2、还有一个假如根据天数来导出数据,每一天作为列,但是每个月的天数都不一样,要怎么根据月份的天数去导出正确的列数呢?
我们可以用 ExcelExportEntity 和 @Excel 来实现。
思路:案例1因为两个页面数据都是同一个数据库表的数据,所以实体bean也是同一个。我们可以把两个页面要导出的字段都注解上@Excel,然后点击导出,调用接口的时候,控制哪个页面要导出哪几个字段。
// 这里简单说一下,比如实体bean有这几个字段:姓名、性别、年龄、手机、邮箱。
// 页面1 要导出 姓名、性别、年龄 这几个字段;页面2 要导出 姓名、手机、邮箱 这几个字段。
// 那么在controller中,直接把这几个字段名用逗号隔开拼接就行,调用 ExcelUtil.dynamicExport 方法,会创建动态列的表头。
下面这里详细讲一下案例2。
@Data
public class TemplateVo {
// 这里只导出25号以后的天数(不然的话字段太多了,这里只是举个栗子,具体字段看实际情况)
@Excel(name = "25日",width = 12)
private String day1;
@Excel(name = "26日",width = 12)
private String day2;
@Excel(name = "27日",width = 12)
private String day3;
@Excel(name = "28日",width = 12)
private String day4;
@Excel(name = "29日",width = 12)
private String day5;
@Excel(name = "30日",width = 12)
private String day6;
@Excel(name = "31日",width = 12)
private String day7;
public TemplateVo(String day1, String day2, String day3, String day4, String day5, String day6, String day7) {
this.day1 = day1;
this.day2 = day2;
this.day3 = day3;
this.day4 = day4;
this.day5 = day5;
this.day6 = day6;
this.day7 = day7;
}
}
/**
* 根据年月获取需要导出的列
*/
private String getExportColumn(int year,int month){
String column = "";
String date = year+"-"+month+"-25";
LocalDate parse = LocalDateTimeUtil.parseDate(date,"yyyy-M-dd");
// 获取这个月份的长度,也就是天数
int length = parse.lengthOfMonth();
// 因为是导出25号(包括25号)以后的天数,所以需要 总天数-25+1
int day = length-25+1;
// 25号到31号总共7天,遍历7次,拼接要导出的列名
for (int i = 1; i <= 7; i++) {
if (i<day) column += "day"+i+",";
else if (i==day) column += "day"+i;
}
return column;
}
/**
* 导出动态列
*/
@RequestMapping("/dynamicColumnExport")
public void dynamicColumnExport(int year,int month,HttpServletResponse response){
List<TemplateVo> list = new ArrayList<>();
for (int i = 0; i < 5; i++) {
list.add(new TemplateVo("25号"+i,"26号"+i,"27号"+i,"28号"+i,"29号"+i,"30号"+i,"31号"+i));
}
// 获取要导出的列名
String column = getExportColumn(year, month);
// 这里是创建动态列的表头,dynamicExport 这个方法在上面那个 ExcelUtil 有
List<ExcelExportEntity> beanList = ExcelUtil.dynamicExport(TemplateVo.class, column);
ExportParams params = new ExportParams();
params.setStyle(ExcelStyleUtil.class);
Workbook workbook = ExcelExportUtil.exportExcel(params, beanList, list);
ExcelUtil.downLoadExcel("下载",response,workbook);
}
暂时就这些了,其实做项目的时候,easypoi碰到的问题不止这些,现在项目做完了,有空了,想总结下把解决办法都写出来,发现项目中遇到的那些问题好像都不适合用来做案例来讲。看一下以后有没有什么补充的吧。(最后,如果觉得文章对你有帮助的话,点个赞再走吧~👀)