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

@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");}

    @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;

2. 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 {@Autowiredprivate 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cellcell = 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;@Overridepublic 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 {@Autowiredprivate ExcelExportService excelExportService;@GetMapping("/h")public void h(HttpServletResponse response) throws IOException {excelExportService.excelExport(response);}
}

然后访问/h接口就可以导出一个Excel文件