springboot使用jxls导出excel

实现思路：
首先在springBoot(或者SpringCloud)项目的默认templates目录放入提前定义好的Excel模板，然后在具体的导出接口业务代码里通过IO流加载到这个Excel模板文件，读取指定的工作薄(也就是excel左下角的Sheet)，接着给模板里的指定表头填充表头数据，接着读取数据库的相关数据用数据传输模型(DTO)封装数据，最后循坏填充excel的数据行(逐行逐列的填充数据)，最后把填充完数据的Excel文件流输出(下载)，即完成了数据库数据按照指定Excel模板导出Excel的完整过程。废话不多说，下面直接上代码。

1.引入依赖

<!--springboot版本-->	
        <parent>
		    <groupId>org.springframework.boot</groupId>
		    <artifactId>spring-boot-starter-parent</artifactId>
		    <version>2.0.6.RELEASE</version>
		    <relativePath />
	    </parent>
		
        <!-- jxls@excel -->
		<dependency>
			<groupId>org.jxls</groupId>
			<artifactId>jxls</artifactId>
			<version>2.3.0</version>
		</dependency>
 
		<dependency>
			<groupId>org.jxls</groupId>
			<artifactId>jxls-poi</artifactId>
			<version>1.0.9</version>
		</dependency>
 
		<dependency>
			<groupId>net.sf.jxls</groupId>
			<artifactId>jxls-core</artifactId>
			<version>1.0.5</version>
		</dependency>

2.excel工具类

import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.Map;
import java.util.UUID;
 
import org.apache.poi.openxml4j.exceptions.InvalidFormatException;
import org.apache.poi.ss.usermodel.Workbook;
import org.springframework.http.HttpHeaders;
import org.springframework.http.HttpStatus;
import org.springframework.http.MediaType;
import org.springframework.http.ResponseEntity;
 
import net.sf.jxls.exception.ParsePropertyException;
import net.sf.jxls.transformer.XLSTransformer;
 
public class ExcelUtil {
 
	/** * 下载excel * * @param sourcePath 模板路径 * @param beanParams excel内容 * @return * @throws ParsePropertyException * @throws InvalidFormatException * @throws IOException */
	public static ResponseEntity<byte[]> downLoadExcel(String sourcePath, Map<String, Object> beanParams)
			throws ParsePropertyException, InvalidFormatException, IOException {
	ByteArrayOutputStream os = new ByteArrayOutputStream();
	//读取模板
	InputStream is =ExcelUtil.class.getClassLoader().getResourceAsStream(sourcePath);
	XLSTransformer transformer = new XLSTransformer();
	//向模板中写入内容
	Workbook workbook = transformer.transformXLS(is, beanParams);
	//写入成功后转化为输出流
	workbook.write(os);
	//配置Response信息
	HttpHeaders headers = new HttpHeaders();
	String downloadFileName = UUID.randomUUID().toString() + ".xlsx";
	//防止中文名乱码
	downloadFileName = new String(downloadFileName.getBytes("UTF-8"), "ISO-8859-1");
	headers.setContentDispositionFormData("attachment", downloadFileName);
	headers.setContentType(MediaType.APPLICATION_OCTET_STREAM);
	//返回
	return new ResponseEntity<byte[]>(os.toByteArray(), headers, HttpStatus.CREATED);
}

3.controller调用

@RequestMapping("/export")
	//返回ResponseEntity<byte[]>使浏览器下载
	public ResponseEntity<byte[]> exportExcel(HttpServletRequest request, HttpServletResponse response) throws Exception {
		//查询参数
		Map<String, Object> params = new HashMap<String, Object>();
		//结果集
		List<Aip_std> list = stdService.selectAllForExportExcel(params);
		Map<String, Object> beanParams = new HashMap<String, Object>();
		beanParams.put("list", list);
		//下载表格
		return ExcelUtil.downLoadExcel("static/excel/aaa.xlsx",beanParams);
	}

4.模板存放位置

5.模板

6.导出的excel

（万能通用模板）— SpringBoot导入、导出Excel文件

先把项目的demo发一下，看完文章可以看一下，demo

前言：最近做项目过程中使用到了一个权限管理框架：若依，使用过程中发现他的文件导入和导出功能非常的实用，在这里特此做一个小demo跟大家分享一下。

导出：将从数据库中查出的List列表，以参数的形式传入模板中，即可返回Excel文件。

@ApiOperation(value = "导出",produces="application/octet-stream")
    @GetMapping("/exportExcel")
    public void exportExcel(HttpServletResponse response) throws IOException {
    // 查询数据列表
        List<UserData> userData = dataService.selectUserData(); 
	// 将list导入模板中
        ExcelUtil<UserData> util = new ExcelUtil<UserData>(UserData.class);
    //返回Excel文件
        util.exportExcel(response,userData , "角色数据");
    }

导入：将Excel文件上传，模板代码会将此Excel文件转换成List列表的形式返回，我们可以将返回的list列表插入到数据库中。

@ApiOperation("导入")
    @PostMapping("/importExcel")
    public int importExcel(MultipartFile file) throws Exception {
        ExcelUtil<UserData> util = new ExcelUtil<>(UserData.class);
        // 将文件以流的形式传入到模板代码中，返回List列表
        List<UserData> userDataList = util.importExcel(file.getInputStream());
        // 将list列表插入到数据库中
        int insertFlag = dataService.importUserData(userDataList);
        if (insertFlag == 0){
            throw new RuntimeException("导入失败");
        }
        return insertFlag;
    }

一、效果图

1.导出Excel

打开Excel效果：

2.导入Excel

1）创建Excel

2）使用swagger导入

3）查看数据库数据

导入成功

二、实现

1.数据库

CREATE TABLE `data` (
  `name` varchar(33) DEFAULT NULL,
  `project` varchar(33) DEFAULT NULL,
  `score` int(3) DEFAULT NULL,
  `id` int(10) NOT NULL AUTO_INCREMENT,
  PRIMARY KEY (`id`),
  KEY `indx_data_funshu` (`score`)
) ENGINE=InnoDB AUTO_INCREMENT=24 DEFAULT CHARSET=utf8;

代码（东西较多，这里只粘贴核心代码，详情请查看详细代码）

1）实体类：在需要导出的字段上加入@Excel注解，name为导出后Excel的表头

@Data
@Table(name = "data")
public class UserData {
    @Id
    @Excel(name = "序号")
    Integer id;
    @Excel(name = "名字")
    String name;
    @Excel(name = "课程")
    String project;
    @Excel(name = "分数")
    Integer score;
}

2）controller文件

package com.example.commonutils.controller;

import com.example.commonutils.common.ExcelUtil;
import com.example.commonutils.domain.UserData;
import com.example.commonutils.service.DataService;
import io.swagger.annotations.Api;
import io.swagger.annotations.ApiOperation;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.multipart.MultipartFile;

import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.util.List;

/** * @author tianzhuang */
@Api(tags = "Excel的导入导出")
@RestController
public class ExportExcelController {

    @Autowired
    private DataService dataService;

    /** * 在浏览器地址栏输入此接口地址，即可导出Excel，用swagger导出是乱码，暂未解决 * @param response * @throws IOException */
    @ApiOperation(value = "导出",produces="application/octet-stream")
    @GetMapping("/exportExcel")
    public void exportExcel(HttpServletResponse response) throws IOException {
        List<UserData> userData = dataService.selectUserData();
        ExcelUtil<UserData> util = new ExcelUtil<UserData>(UserData.class);
        util.exportExcel(response,userData , "角色数据");
    }

    /** * * @param file * @return * @throws Exception */
    @ApiOperation("导入")
    @PostMapping("/importExcel")
    public int importExcel(MultipartFile file) throws Exception {
        ExcelUtil<UserData> util = new ExcelUtil<>(UserData.class);
        List<UserData> userDataList = util.importExcel(file.getInputStream());
        int insertFlag = dataService.importUserData(userDataList);
        if (insertFlag == 0){
            throw new RuntimeException("导入失败");
        }
        return insertFlag;
    }
}

ExcelUtil代码

package com.example.commonutils.common;

import com.example.commonutils.common.Excel.ColumnType;
import com.example.commonutils.common.Excel.Type;
import org.apache.poi.hssf.usermodel.HSSFDateUtil;
import org.apache.poi.ss.usermodel.*;
import org.apache.poi.ss.util.CellRangeAddressList;
import org.apache.poi.xssf.streaming.SXSSFWorkbook;
import org.apache.poi.xssf.usermodel.XSSFDataValidation;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.lang.reflect.Field;
import java.math.BigDecimal;
import java.text.DecimalFormat;
import java.util.*;
import java.util.stream.Collectors;

/** * Excel相关处理 * * @author ruoyi */
public class ExcelUtil<T>
{
    private static final Logger log = LoggerFactory.getLogger(ExcelUtil.class);

    /** * Excel sheet最大行数，默认65536 */
    public static final int sheetSize = 65536;

    /** * 工作表名称 */
    private String sheetName;

    /** * 导出类型（EXPORT:导出数据；IMPORT：导入模板） */
    private Type type;

    /** * 工作薄对象 */
    private Workbook wb;

    /** * 工作表对象 */
    private Sheet sheet;

    /** * 样式列表 */
    private Map<String, CellStyle> styles;

    /** * 导入导出数据列表 */
    private List<T> list;

    /** * 注解列表 */
    private List<Object[]> fields;

    /** * 统计列表 */
    private Map<Integer, Double> statistics = new HashMap<Integer, Double>();

    /** * 数字格式 */
    private static final DecimalFormat DOUBLE_FORMAT = new DecimalFormat("######0.00");

    /** * 实体对象 */
    public Class<T> clazz;

    public ExcelUtil(Class<T> clazz)
    {
        this.clazz = clazz;
    }

    public void init(List<T> list, String sheetName, Type type)
    {
        if (list == null)
        {
            list = new ArrayList<T>();
        }
        this.list = list;
        this.sheetName = sheetName;
        this.type = type;
        createExcelField();
        createWorkbook();
    }

    /** * 对excel表单默认第一个索引名转换成list * * @param is 输入流 * @return 转换后集合 */
    public List<T> importExcel(InputStream is) throws Exception
    {
        return importExcel(StringUtils.EMPTY, is);
    }

    /** * 对excel表单指定表格索引名转换成list * * @param sheetName 表格索引名 * @param is 输入流 * @return 转换后集合 */
    public List<T> importExcel(String sheetName, InputStream is) throws Exception
    {
        this.type = Type.IMPORT;
        this.wb = WorkbookFactory.create(is);
        List<T> list = new ArrayList<T>();
        Sheet sheet = null;
        if (StringUtils.isNotEmpty(sheetName))
        {
            // 如果指定sheet名,则取指定sheet中的内容.
            sheet = wb.getSheet(sheetName);
        }
        else
        {
            // 如果传入的sheet名不存在则默认指向第1个sheet.
            sheet = wb.getSheetAt(0);
        }

        if (sheet == null)
        {
            throw new IOException("文件sheet不存在");
        }

        int rows = sheet.getPhysicalNumberOfRows();

        if (rows > 0)
        {
            // 定义一个map用于存放excel列的序号和field.
            Map<String, Integer> cellMap = new HashMap<String, Integer>();
            // 获取表头
            Row heard = sheet.getRow(0);
            for (int i = 0; i < heard.getPhysicalNumberOfCells(); i++)
            {
                Cell cell = heard.getCell(i);
                if (StringUtils.isNotNull(cell))
                {
                    String value = this.getCellValue(heard, i).toString();
                    cellMap.put(value, i);
                }
                else
                {
                    cellMap.put(null, i);
                }
            }
            // 有数据时才处理 得到类的所有field.
            Field[] allFields = clazz.getDeclaredFields();
            // 定义一个map用于存放列的序号和field.
            Map<Integer, Field> fieldsMap = new HashMap<Integer, Field>();
            for (int col = 0; col < allFields.length; col++)
            {
                Field field = allFields[col];
                Excel attr = field.getAnnotation(Excel.class);
                if (attr != null && (attr.type() == Type.ALL || attr.type() == type))
                {
                    // 设置类的私有字段属性可访问.
                    field.setAccessible(true);
                    Integer column = cellMap.get(attr.name());
                    if (column != null)
                    {
                        fieldsMap.put(column, field);
                    }
                }
            }
            for (int i = 1; i < rows; i++)
            {
                // 从第2行开始取数据,默认第一行是表头.
                Row row = sheet.getRow(i);
                T entity = null;
                for (Map.Entry<Integer, Field> entry : fieldsMap.entrySet())
                {
                    Object val = this.getCellValue(row, entry.getKey());

                    // 如果不存在实例则新建.
                    entity = (entity == null ? clazz.newInstance() : entity);
                    // 从map中得到对应列的field.
                    Field field = fieldsMap.get(entry.getKey());
                    // 取得类型,并根据对象类型设置值.
                    Class<?> fieldType = field.getType();
                    if (String.class == fieldType)
                    {
                        String s = Convert.toStr(val);
                        if (StringUtils.endsWith(s, ".0"))
                        {
                            val = StringUtils.substringBefore(s, ".0");
                        }
                        else
                        {
                            val = Convert.toStr(val);
                        }
                    }
                    else if ((Integer.TYPE == fieldType || Integer.class == fieldType) && StringUtils.isNumeric(Convert.toStr(val)))
                    {
                        val = Convert.toInt(val);
                    }
                    else if (Long.TYPE == fieldType || Long.class == fieldType)
                    {
                        val = Convert.toLong(val);
                    }
                    else if (Double.TYPE == fieldType || Double.class == fieldType)
                    {
                        val = Convert.toDouble(val);
                    }
                    else if (Float.TYPE == fieldType || Float.class == fieldType)
                    {
                        val = Convert.toFloat(val);
                    }
                    else if (BigDecimal.class == fieldType)
                    {
                        val = Convert.toBigDecimal(val);
                    }
                    else if (Date.class == fieldType)
                    {
                        if (val instanceof String)
                        {
                            val = DateUtils.parseDate(val);
                        }
                        else if (val instanceof Double)
                        {
                            val = DateUtil.getJavaDate((Double) val);
                        }
                    }
                    if (StringUtils.isNotNull(fieldType))
                    {
                        Excel attr = field.getAnnotation(Excel.class);
                        String propertyName = field.getName();
                        if (StringUtils.isNotEmpty(attr.targetAttr()))
                        {
                            propertyName = field.getName() + "." + attr.targetAttr();
                        }
                        else if (StringUtils.isNotEmpty(attr.readConverterExp()))
                        {
                            val = reverseByExp(Convert.toStr(val), attr.readConverterExp(), attr.separator());
                        }
                        ReflectUtils.invokeSetter(entity, propertyName, val);
                    }
                }
                list.add(entity);
            }
        }
        return list;
    }

    /** * 对list数据源将其里面的数据导入到excel表单 * * @param response 返回数据 * @param list 导出数据集合 * @param sheetName 工作表的名称 * @return 结果 * @throws IOException */
    public void exportExcel(HttpServletResponse response, List<T> list, String sheetName) throws IOException
    {
        response.setContentType("application/vnd.ms-excel");
        response.setCharacterEncoding("utf-8");
        this.init(list, sheetName, Type.EXPORT);
        exportExcel(response.getOutputStream());
    }

    /** * 对list数据源将其里面的数据导入到excel表单 * * @param sheetName 工作表的名称 * @return 结果 */
    public void importTemplateExcel(HttpServletResponse response, String sheetName) throws IOException
    {
        response.setContentType("application/vnd.ms-excel");
        response.setCharacterEncoding("utf-8");
        this.init(null, sheetName, Type.IMPORT);
        exportExcel(response.getOutputStream());
    }

    /** * 对list数据源将其里面的数据导入到excel表单 * * @return 结果 */
    public void exportExcel(OutputStream outputStream)
    {
        try
        {
            // 取出一共有多少个sheet.
            double sheetNo = Math.ceil(list.size() / sheetSize);
            for (int index = 0; index <= sheetNo; index++)
            {
                createSheet(sheetNo, index);

                // 产生一行
                Row row = sheet.createRow(0);
                int column = 0;
                // 写入各个字段的列头名称
                for (Object[] os : fields)
                {
                    Excel excel = (Excel) os[1];
                    this.createCell(excel, row, column++);
                }
                if (Type.EXPORT.equals(type))
                {
                    fillExcelData(index, row);
                    addStatisticsRow();
                }
            }
            wb.write(outputStream);
        }
        catch (Exception e)
        {
            log.error("导出Excel异常{}", e.getMessage());
        }
        finally
        {
            if (wb != null)
            {
                try
                {
                    wb.close();
                }
                catch (IOException e1)
                {
                    e1.printStackTrace();
                }
            }
            if (outputStream != null)
            {
                try
                {
                    outputStream.close();
                }
                catch (IOException e1)
                {
                    e1.printStackTrace();
                }
            }
        }
    }

    /** * 填充excel数据 * * @param index 序号 * @param row 单元格行 */
    public void fillExcelData(int index, Row row)
    {
        int startNo = index * sheetSize;
        int endNo = Math.min(startNo + sheetSize, list.size());
        for (int i = startNo; i < endNo; i++)
        {
            row = sheet.createRow(i + 1 - startNo);
            // 得到导出对象.
            T vo = (T) list.get(i);
            int column = 0;
            for (Object[] os : fields)
            {
                Field field = (Field) os[0];
                Excel excel = (Excel) os[1];
                // 设置实体类私有属性可访问
                field.setAccessible(true);
                this.addCell(excel, row, vo, field, column++);
            }
        }
    }

    /** * 创建表格样式 * * @param wb 工作薄对象 * @return 样式列表 */
    private Map<String, CellStyle> createStyles(Workbook wb)
    {
        // 写入各条记录,每条记录对应excel表中的一行
        Map<String, CellStyle> styles = new HashMap<String, CellStyle>();
        CellStyle style = wb.createCellStyle();
        style.setAlignment(HorizontalAlignment.CENTER);
        style.setVerticalAlignment(VerticalAlignment.CENTER);
        style.setBorderRight(BorderStyle.THIN);
        style.setRightBorderColor(IndexedColors.GREY_50_PERCENT.getIndex());
        style.setBorderLeft(BorderStyle.THIN);
        style.setLeftBorderColor(IndexedColors.GREY_50_PERCENT.getIndex());
        style.setBorderTop(BorderStyle.THIN);
        style.setTopBorderColor(IndexedColors.GREY_50_PERCENT.getIndex());
        style.setBorderBottom(BorderStyle.THIN);
        style.setBottomBorderColor(IndexedColors.GREY_50_PERCENT.getIndex());
        Font dataFont = wb.createFont();
        dataFont.setFontName("Arial");
        dataFont.setFontHeightInPoints((short) 10);
        style.setFont(dataFont);
        styles.put("data", style);

        style = wb.createCellStyle();
        style.cloneStyleFrom(styles.get("data"));
        style.setAlignment(HorizontalAlignment.CENTER);
        style.setVerticalAlignment(VerticalAlignment.CENTER);
        style.setFillForegroundColor(IndexedColors.GREY_50_PERCENT.getIndex());
        style.setFillPattern(FillPatternType.SOLID_FOREGROUND);
        Font headerFont = wb.createFont();
        headerFont.setFontName("Arial");
        headerFont.setFontHeightInPoints((short) 10);
        headerFont.setBold(true);
        headerFont.setColor(IndexedColors.WHITE.getIndex());
        style.setFont(headerFont);
        styles.put("header", style);
        
        style = wb.createCellStyle();
        style.setAlignment(HorizontalAlignment.CENTER);
        style.setVerticalAlignment(VerticalAlignment.CENTER);
        Font totalFont = wb.createFont();
        totalFont.setFontName("Arial");
        totalFont.setFontHeightInPoints((short) 10);
        style.setFont(totalFont);
        styles.put("total", style);

        return styles;
    }

    /** * 创建单元格 */
    public Cell createCell(Excel attr, Row row, int column)
    {
        // 创建列
        Cell cell = row.createCell(column);
        // 写入列信息
        cell.setCellValue(attr.name());
        setDataValidation(attr, row, column);
        cell.setCellStyle(styles.get("header"));
        return cell;
    }

    /** * 设置单元格信息 * * @param value 单元格值 * @param attr 注解相关 * @param cell 单元格信息 */
    public void setCellVo(Object value, Excel attr, Cell cell)
    {
        if (ColumnType.STRING == attr.cellType())
        {
            cell.setCellType(CellType.STRING);
            cell.setCellValue(StringUtils.isNull(value) ? attr.defaultValue() : value + attr.suffix());
        }
        else if (ColumnType.NUMERIC == attr.cellType())
        {
            cell.setCellType(CellType.NUMERIC);
            cell.setCellValue(StringUtils.contains(Convert.toStr(value), ".") ? Convert.toDouble(value) : Convert.toInt(value));
        }
    }

    /** * 创建表格样式 */
    public void setDataValidation(Excel attr, Row row, int column)
    {
        if (attr.name().indexOf("注：") >= 0)
        {
            sheet.setColumnWidth(column, 6000);
        }
        else
        {
            // 设置列宽
            sheet.setColumnWidth(column, (int) ((attr.width() + 0.72) * 256));
            row.setHeight((short) (attr.height() * 20));
        }
        // 如果设置了提示信息则鼠标放上去提示.
        if (StringUtils.isNotEmpty(attr.prompt()))
        {
            // 这里默认设了2-101列提示.
            setXSSFPrompt(sheet, "", attr.prompt(), 1, 100, column, column);
        }
        // 如果设置了combo属性则本列只能选择不能输入
        if (attr.combo().length > 0)
        {
            // 这里默认设了2-101列只能选择不能输入.
            setXSSFValidation(sheet, attr.combo(), 1, 100, column, column);
        }
    }

    /** * 添加单元格 */
    public Cell addCell(Excel attr, Row row, T vo, Field field, int column)
    {
        Cell cell = null;
        try
        {
            // 设置行高
            row.setHeight((short) (attr.height() * 20));
            // 根据Excel中设置情况决定是否导出,有些情况需要保持为空,希望用户填写这一列.
            if (attr.isExport())
            {
                // 创建cell
                cell = row.createCell(column);
                cell.setCellStyle(styles.get("data"));

                // 用于读取对象中的属性
                Object value = getTargetValue(vo, field, attr);
                String dateFormat = attr.dateFormat();
                String readConverterExp = attr.readConverterExp();
                String separator = attr.separator();
                if (StringUtils.isNotEmpty(dateFormat) && StringUtils.isNotNull(value))
                {
                    cell.setCellValue(DateUtils.parseDateToStr(dateFormat, (Date) value));
                }
                else if (StringUtils.isNotEmpty(readConverterExp) && StringUtils.isNotNull(value))
                {
                    cell.setCellValue(convertByExp(Convert.toStr(value), readConverterExp, separator));
                }
                else if (value instanceof BigDecimal && -1 != attr.scale())
                {
                    cell.setCellValue((((BigDecimal) value).setScale(attr.scale(), attr.roundingMode())).toString());
                }
                else
                {
                    // 设置列类型
                    setCellVo(value, attr, cell);
                }
                addStatisticsData(column, Convert.toStr(value), attr);
            }
        }
        catch (Exception e)
        {
            log.error("导出Excel失败{}", e);
        }
        return cell;
    }

    /** * 设置 POI XSSFSheet 单元格提示 * * @param sheet 表单 * @param promptTitle 提示标题 * @param promptContent 提示内容 * @param firstRow 开始行 * @param endRow 结束行 * @param firstCol 开始列 * @param endCol 结束列 */
    public void setXSSFPrompt(Sheet sheet, String promptTitle, String promptContent, int firstRow, int endRow,
            int firstCol, int endCol)
    {
        DataValidationHelper helper = sheet.getDataValidationHelper();
        DataValidationConstraint constraint = helper.createCustomConstraint("DD1");
        CellRangeAddressList regions = new CellRangeAddressList(firstRow, endRow, firstCol, endCol);
        DataValidation dataValidation = helper.createValidation(constraint, regions);
        dataValidation.createPromptBox(promptTitle, promptContent);
        dataValidation.setShowPromptBox(true);
        sheet.addValidationData(dataValidation);
    }

    /** * 设置某些列的值只能输入预制的数据,显示下拉框. * * @param sheet 要设置的sheet. * @param textlist 下拉框显示的内容 * @param firstRow 开始行 * @param endRow 结束行 * @param firstCol 开始列 * @param endCol 结束列 * @return 设置好的sheet. */
    public void setXSSFValidation(Sheet sheet, String[] textlist, int firstRow, int endRow, int firstCol, int endCol)
    {
        DataValidationHelper helper = sheet.getDataValidationHelper();
        // 加载下拉列表内容
        DataValidationConstraint constraint = helper.createExplicitListConstraint(textlist);
        // 设置数据有效性加载在哪个单元格上,四个参数分别是：起始行、终止行、起始列、终止列
        CellRangeAddressList regions = new CellRangeAddressList(firstRow, endRow, firstCol, endCol);
        // 数据有效性对象
        DataValidation dataValidation = helper.createValidation(constraint, regions);
        // 处理Excel兼容性问题
        if (dataValidation instanceof XSSFDataValidation)
        {
            dataValidation.setSuppressDropDownArrow(true);
            dataValidation.setShowErrorBox(true);
        }
        else
        {
            dataValidation.setSuppressDropDownArrow(false);
        }

        sheet.addValidationData(dataValidation);
    }

    /** * 解析导出值 0=男,1=女,2=未知 * * @param propertyValue 参数值 * @param converterExp 翻译注解 * @param separator 分隔符 * @return 解析后值 */
    public static String convertByExp(String propertyValue, String converterExp, String separator)
    {
        StringBuilder propertyString = new StringBuilder();
        String[] convertSource = converterExp.split(",");
        for (String item : convertSource)
        {
            String[] itemArray = item.split("=");
            if (StringUtils.containsAny(separator, propertyValue))
            {
                for (String value : propertyValue.split(separator))
                {
                    if (itemArray[0].equals(value))
                    {
                        propertyString.append(itemArray[1] + separator);
                        break;
                    }
                }
            }
            else
            {
                if (itemArray[0].equals(propertyValue))
                {
                    return itemArray[1];
                }
            }
        }
        return StringUtils.stripEnd(propertyString.toString(), separator);
    }

    /** * 反向解析值 男=0,女=1,未知=2 * * @param propertyValue 参数值 * @param converterExp 翻译注解 * @param separator 分隔符 * @return 解析后值 */
    public static String reverseByExp(String propertyValue, String converterExp, String separator)
    {
        StringBuilder propertyString = new StringBuilder();
        String[] convertSource = converterExp.split(",");
        for (String item : convertSource)
        {
            String[] itemArray = item.split("=");
            if (StringUtils.containsAny(separator, propertyValue))
            {
                for (String value : propertyValue.split(separator))
                {
                    if (itemArray[1].equals(value))
                    {
                        propertyString.append(itemArray[0] + separator);
                        break;
                    }
                }
            }
            else
            {
                if (itemArray[1].equals(propertyValue))
                {
                    return itemArray[0];
                }
            }
        }
        return StringUtils.stripEnd(propertyString.toString(), separator);
    }

    /** * 合计统计信息 */
    private void addStatisticsData(Integer index, String text, Excel entity)
    {
        if (entity != null && entity.isStatistics())
        {
            Double temp = 0D;
            if (!statistics.containsKey(index))
            {
                statistics.put(index, temp);
            }
            try
            {
                temp = Double.valueOf(text);
            }
            catch (NumberFormatException e)
            {
            }
            statistics.put(index, statistics.get(index) + temp);
        }
    }

    /** * 创建统计行 */
    public void addStatisticsRow()
    {
        if (statistics.size() > 0)
        {
            Cell cell = null;
            Row row = sheet.createRow(sheet.getLastRowNum() + 1);
            Set<Integer> keys = statistics.keySet();
            cell = row.createCell(0);
            cell.setCellStyle(styles.get("total"));
            cell.setCellValue("合计");

            for (Integer key : keys)
            {
                cell = row.createCell(key);
                cell.setCellStyle(styles.get("total"));
                cell.setCellValue(DOUBLE_FORMAT.format(statistics.get(key)));
            }
            statistics.clear();
        }
    }

    /** * 获取bean中的属性值 * * @param vo 实体对象 * @param field 字段 * @param excel 注解 * @return 最终的属性值 * @throws Exception */
    private Object getTargetValue(T vo, Field field, Excel excel) throws Exception
    {
        Object o = field.get(vo);
        if (StringUtils.isNotEmpty(excel.targetAttr()))
        {
            String target = excel.targetAttr();
            if (target.indexOf(".") > -1)
            {
                String[] targets = target.split("[.]");
                for (String name : targets)
                {
                    o = getValue(o, name);
                }
            }
            else
            {
                o = getValue(o, target);
            }
        }
        return o;
    }

    /** * 以类的属性的get方法方法形式获取值 * * @param o * @param name * @return value * @throws Exception */
    private Object getValue(Object o, String name) throws Exception
    {
        if (StringUtils.isNotEmpty(name))
        {
            Class<?> clazz = o.getClass();
            Field field = clazz.getDeclaredField(name);
            field.setAccessible(true);
            o = field.get(o);
        }
        return o;
    }

    /** * 得到所有定义字段 */
    private void createExcelField()
    {
        this.fields = new ArrayList<Object[]>();
        List<Field> tempFields = new ArrayList<>();
        tempFields.addAll(Arrays.asList(clazz.getSuperclass().getDeclaredFields()));
        tempFields.addAll(Arrays.asList(clazz.getDeclaredFields()));
        for (Field field : tempFields)
        {
            // 单注解
            if (field.isAnnotationPresent(Excel.class))
            {
                putToField(field, field.getAnnotation(Excel.class));
            }

            // 多注解
            if (field.isAnnotationPresent(Excels.class))
            {
                Excels attrs = field.getAnnotation(Excels.class);
                Excel[] excels = attrs.value();
                for (Excel excel : excels)
                {
                    putToField(field, excel);
                }
            }
        }
        this.fields = this.fields.stream().sorted(Comparator.comparing(objects -> ((Excel) objects[1]).sort())).collect(Collectors.toList());
    }

    /** * 放到字段集合中 */
    private void putToField(Field field, Excel attr)
    {
        if (attr != null && (attr.type() == Type.ALL || attr.type() == type))
        {
            this.fields.add(new Object[] { field, attr });
        }
    }

    /** * 创建一个工作簿 */
    public void createWorkbook()
    {
        this.wb = new SXSSFWorkbook(500);
    }

    /** * 创建工作表 * * @param sheetNo sheet数量 * @param index 序号 */
    public void createSheet(double sheetNo, int index)
    {
        this.sheet = wb.createSheet();
        this.styles = createStyles(wb);
        // 设置工作表的名称.
        if (sheetNo == 0)
        {
            wb.setSheetName(index, sheetName);
        }
        else
        {
            wb.setSheetName(index, sheetName + index);
        }
    }

    /** * 获取单元格值 * * @param row 获取的行 * @param column 获取单元格列号 * @return 单元格值 */
    public Object getCellValue(Row row, int column)
    {
        if (row == null)
        {
            return row;
        }
        Object val = "";
        try
        {
            Cell cell = row.getCell(column);
            if (StringUtils.isNotNull(cell))
            {
                if (cell.getCellTypeEnum() == CellType.NUMERIC || cell.getCellTypeEnum() == CellType.FORMULA)
                {
                    val = cell.getNumericCellValue();
                    if (HSSFDateUtil.isCellDateFormatted(cell))
                    {
                        val = DateUtil.getJavaDate((Double) val); // POI Excel 日期格式转换
                    }
                    else
                    {
                        if ((Double) val % 1 > 0)
                        {
                            val = new BigDecimal(val.toString());
                        }
                        else
                        {
                            val = new DecimalFormat("0").format(val);
                        }
                    }
                }
                else if (cell.getCellTypeEnum() == CellType.STRING)
                {
                    val = cell.getStringCellValue();
                }
                else if (cell.getCellTypeEnum() == CellType.BOOLEAN)
                {
                    val = cell.getBooleanCellValue();
                }
                else if (cell.getCellTypeEnum() == CellType.ERROR)
                {
                    val = cell.getErrorCellValue();
                }

            }
        }
        catch (Exception e)
        {
            return val;
        }
        return val;
    }
}

3）Excel注解代码

package com.example.commonutils.common;

import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;
import java.math.BigDecimal;

/** * 自定义导出Excel数据注解 * * @author ruoyi */
@Retention(RetentionPolicy.RUNTIME)
@Target(ElementType.FIELD)
public @interface Excel
{
    /** * 导出时在excel中排序 */
    public int sort() default Integer.MAX_VALUE;

    /** * 导出到Excel中的名字. */
    public String name() default "";

    /** * 日期格式, 如: yyyy-MM-dd */
    public String dateFormat() default "";

    /** * 读取内容转表达式 (如: 0=男,1=女,2=未知) */
    public String readConverterExp() default "";

    /** * 分隔符，读取字符串组内容 */
    public String separator() default ",";

    /** * BigDecimal 精度 默认:-1(默认不开启BigDecimal格式化) */
    public int scale() default -1;

    /** * BigDecimal 舍入规则 默认:BigDecimal.ROUND_HALF_EVEN */
    public int roundingMode() default BigDecimal.ROUND_HALF_EVEN;

    /** * 导出类型（0数字 1字符串） */
    public ColumnType cellType() default ColumnType.STRING;

    /** * 导出时在excel中每个列的高度 单位为字符 */
    public double height() default 14;

    /** * 导出时在excel中每个列的宽 单位为字符 */
    public double width() default 16;

    /** * 文字后缀,如% 90 变成90% */
    public String suffix() default "";

    /** * 当值为空时,字段的默认值 */
    public String defaultValue() default "";

    /** * 提示信息 */
    public String prompt() default "";

    /** * 设置只能选择不能输入的列内容. */
    public String[] combo() default {};

    /** * 是否导出数据,应对需求:有时我们需要导出一份模板,这是标题需要但内容需要用户手工填写. */
    public boolean isExport() default true;

    /** * 另一个类中的属性名称,支持多级获取,以小数点隔开 */
    public String targetAttr() default "";

    /** * 是否自动统计数据,在最后追加一行统计数据总和 */
    public boolean isStatistics() default false;

    /** * 字段类型（0：导出导入；1：仅导出；2：仅导入） */
    Type type() default Type.ALL;

    public enum Type
    {
        ALL(0), EXPORT(1), IMPORT(2);
        private final int value;

        Type(int value)
        {
            this.value = value;
        }

        public int value()
        {
            return this.value;
        }
    }

    public enum ColumnType
    {
        NUMERIC(0), STRING(1);
        private final int value;

        ColumnType(int value)
        {
            this.value = value;
        }

        public int value()
        {
            return this.value;
        }
    }
}

代码量较多，本文只放了部分代码，可以进入demo进行详细查看

SpringBoot整合EasyExcel模板导出Excel

创建`SpringBoot`项目

导入`EasyExcel.jar`

<dependency>
	<groupId>com.alibaba</groupId>
    <artifactId>easyexcel</artifactId>
    <version>2.1.6</version>
</dependency>

创建Excel模板

`实体类`

public class FillData {
	private String name;
	@NumberFormat("##.0")
	private Double chinese;
	@NumberFormat("##.0")
	private Double math;
	@NumberFormat("##.0")
	private Double english;
	@NumberFormat("##.0")
	private Double number;
	//getter setter
}

`Service实现`

@Service
public class ExcelExportServiceImpl implements ExcelExportService{
	//在springboot文件(application.properties)中配置模板所在的位置，例如
	//excel.template=E:/SpringToolSuiteForEclipseWorkSpace/PrivateApplication/EasyExcel/src/main/resources/1.xlsx
	@Value("${excel.template}")
	private String templateFileName;
	
	@Override
	public void excelExport(HttpServletResponse response) throws IOException {
		// 模板注意 用{} 来表示你要用的变量 如果本来就有"{","}" 特殊字符 用"\{","\}"代替
		System.out.println(templateFileName);
		// 方案1 根据对象填充
		String fileName = "simpleFill" + System.currentTimeMillis() + ".xlsx";
		// 这里 会填充到第一个sheet， 然后文件流会自动关闭
		List<FillData> l = new ArrayList<>();
		for(Integer i = 0; i < 50; i++){
			FillData fillData = new FillData();
			fillData.setName("张三" + i+"号");
			fillData.setChinese(120.0+i);
			fillData.setEnglish(141.0+i);
			fillData.setMath(119.0+i);
			fillData.setNumber(fillData.getChinese()+fillData.getEnglish()+fillData.getMath());
			l.add(fillData);
		}
		response.setContentType("application/vnd.ms-excel");
		response.setCharacterEncoding("UTF-8");
		response.setHeader("Content-disposition","attachment;filename="+new String(fileName.getBytes(),"iso-8859-1"));
		EasyExcel.write(response.getOutputStream(),FillData.class).withTemplate(templateFileName).sheet().doFill(l);
	}
}

EasyExcel是import com.alibaba.excel.EasyExcel;

`Service接口`

public interface ExcelExportService {

	void excelExport(HttpServletResponse response) throws IOException;

}
12345

`控制器Controller`

@RestController
public class HelloController {
	@Autowired
	private ExcelExportService excelExportService;
	
	@GetMapping("/h")
	public void h(HttpServletResponse response) throws IOException {
		excelExportService.excelExport(response);
	}
}

springboot使用jxls导出excel_（万能通用模板）--- SpringBoot导入、导出Excel文件_SpringBoot整合EasyExcel模板导出Excel