springboot中Excel文件导出

一、添加依赖

            <!-- excel工具 --><dependency><groupId>org.apache.poi</groupId><artifactId>poi-ooxml</artifactId><version>${poi.version}</version></dependency>

二、导出数据实体类字段加注解

package com.ruoyi.system.domain;import java.util.Date;
import com.fasterxml.jackson.annotation.JsonFormat;
import org.apache.commons.lang3.builder.ToStringBuilder;
import org.apache.commons.lang3.builder.ToStringStyle;
import com.ruoyi.common.annotation.Excel;
import com.ruoyi.common.core.domain.BaseEntity;/*** 对象 sys_product* * @date 2021-12-29*/
public class SysProduct extends BaseEntity
{private static final long serialVersionUID = 1L;/** $column.columnComment */private String id;/** 名称 */@Excel(name = "名称")private String productname;/** 规格 */@Excel(name = "规格")private String specifications;/** 原价 */@Excel(name = "原价")private Long originalprice;/** 现价 */@Excel(name = "现价")private Long price;/** 库存 */@Excel(name = "库存")private String stock;/** 创建日期 */@JsonFormat(pattern = "yyyy-MM-dd HH:mm:ss")@Excel(name = "创建日期", width = 30, dateFormat = "yyyy-MM-dd HH:mm:ss")private Date createtime;/** 更新日期 */@JsonFormat(pattern = "yyyy-MM-dd HH:mm:ss")@Excel(name = "更新日期", width = 30, dateFormat = "yyyy-MM-dd HH:mm:ss")private Date updatetime;/** 生产日期 */@JsonFormat(pattern = "yyyy-MM-dd HH:mm:ss")@Excel(name = "生产日期", width = 30, dateFormat = "yyyy-MM-dd HH:mm:ss")private Date dateofmanufacture;/** 保质期 */@Excel(name = "保质期")private String qualityguaranteeperiod;/** 图片路径 */@Excel(name = "图片路径")private String imageurl;public Date getCreatetime() {return createtime;}public void setCreatetime(Date createtime) {this.createtime = createtime;}public Date getUpdatetime() {return updatetime;}public void setUpdatetime(Date updatetime) {this.updatetime = updatetime;}public void setId(String id){this.id = id;}public String getId() {return id;}public void setProductname(String productname) {this.productname = productname;}public String getProductname() {return productname;}public void setSpecifications(String specifications) {this.specifications = specifications;}public String getSpecifications() {return specifications;}public void setOriginalprice(Long originalprice) {this.originalprice = originalprice;}public Long getOriginalprice() {return originalprice;}public void setPrice(Long price) {this.price = price;}public Long getPrice() {return price;}public void setStock(String stock) {this.stock = stock;}public String getStock() {return stock;}public void setDateofmanufacture(Date dateofmanufacture) {this.dateofmanufacture = dateofmanufacture;}public Date getDateofmanufacture() {return dateofmanufacture;}public void setQualityguaranteeperiod(String qualityguaranteeperiod) {this.qualityguaranteeperiod = qualityguaranteeperiod;}public String getQualityguaranteeperiod() {return qualityguaranteeperiod;}public void setImageurl(String imageurl) {this.imageurl = imageurl;}public String getImageurl() {return imageurl;}@Overridepublic String toString() {return new ToStringBuilder(this,ToStringStyle.MULTI_LINE_STYLE).append("id", getId()).append("productname", getProductname()).append("specifications", getSpecifications()).append("originalprice", getOriginalprice()).append("price", getPrice()).append("stock", getStock()).append("dateofmanufacture", getDateofmanufacture()).append("qualityguaranteeperiod", getQualityguaranteeperiod()).append("imageurl", getImageurl()).append("createtime", getCreatetime()).append("updatetime", getUpdatetime()).toString();}
}

三、添加工具类 ExcelUtil.java

package com.ruoyi.common.utils.poi;import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.lang.reflect.Field;
import java.lang.reflect.Method;
import java.math.BigDecimal;
import java.text.DecimalFormat;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Comparator;
import java.util.Date;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.UUID;
import java.util.stream.Collectors;
import javax.servlet.http.HttpServletResponse;
import org.apache.poi.hssf.usermodel.HSSFClientAnchor;
import org.apache.poi.hssf.usermodel.HSSFPicture;
import org.apache.poi.hssf.usermodel.HSSFPictureData;
import org.apache.poi.hssf.usermodel.HSSFShape;
import org.apache.poi.hssf.usermodel.HSSFSheet;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.ooxml.POIXMLDocumentPart;
import org.apache.poi.ss.usermodel.BorderStyle;
import org.apache.poi.ss.usermodel.Cell;
import org.apache.poi.ss.usermodel.CellStyle;
import org.apache.poi.ss.usermodel.CellType;
import org.apache.poi.ss.usermodel.ClientAnchor;
import org.apache.poi.ss.usermodel.DataValidation;
import org.apache.poi.ss.usermodel.DataValidationConstraint;
import org.apache.poi.ss.usermodel.DataValidationHelper;
import org.apache.poi.ss.usermodel.DateUtil;
import org.apache.poi.ss.usermodel.Drawing;
import org.apache.poi.ss.usermodel.FillPatternType;
import org.apache.poi.ss.usermodel.Font;
import org.apache.poi.ss.usermodel.HorizontalAlignment;
import org.apache.poi.ss.usermodel.IndexedColors;
import org.apache.poi.ss.usermodel.PictureData;
import org.apache.poi.ss.usermodel.Row;
import org.apache.poi.ss.usermodel.Sheet;
import org.apache.poi.ss.usermodel.VerticalAlignment;
import org.apache.poi.ss.usermodel.Workbook;
import org.apache.poi.ss.usermodel.WorkbookFactory;
import org.apache.poi.ss.util.CellRangeAddress;
import org.apache.poi.ss.util.CellRangeAddressList;
import org.apache.poi.util.IOUtils;
import org.apache.poi.xssf.streaming.SXSSFWorkbook;
import org.apache.poi.xssf.usermodel.XSSFClientAnchor;
import org.apache.poi.xssf.usermodel.XSSFDataValidation;
import org.apache.poi.xssf.usermodel.XSSFDrawing;
import org.apache.poi.xssf.usermodel.XSSFPicture;
import org.apache.poi.xssf.usermodel.XSSFShape;
import org.apache.poi.xssf.usermodel.XSSFSheet;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;
import org.openxmlformats.schemas.drawingml.x2006.spreadsheetDrawing.CTMarker;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import com.ruoyi.common.annotation.Excel;
import com.ruoyi.common.annotation.Excel.ColumnType;
import com.ruoyi.common.annotation.Excel.Type;
import com.ruoyi.common.annotation.Excels;
import com.ruoyi.common.config.RuoYiConfig;
import com.ruoyi.common.core.domain.AjaxResult;
import com.ruoyi.common.core.text.Convert;
import com.ruoyi.common.exception.UtilException;
import com.ruoyi.common.utils.DateUtils;
import com.ruoyi.common.utils.DictUtils;
import com.ruoyi.common.utils.StringUtils;
import com.ruoyi.common.utils.file.FileTypeUtils;
import com.ruoyi.common.utils.file.FileUtils;
import com.ruoyi.common.utils.file.ImageUtils;
import com.ruoyi.common.utils.reflect.ReflectUtils;/*** Excel相关处理* */
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;/*** 当前行号*/private int rownum;/*** 标题*/private String title;/*** 最大高度*/private short maxHeight;/*** 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, String title, Type type){if (list == null){list = new ArrayList<T>();}this.list = list;this.sheetName = sheetName;this.type = type;this.title = title;createExcelField();createWorkbook();createTitle();}/*** 创建excel第一行标题*/public void createTitle(){if (StringUtils.isNotEmpty(title)){Row titleRow = sheet.createRow(rownum == 0 ? rownum++ : 0);titleRow.setHeightInPoints(30);Cell titleCell = titleRow.createCell(0);titleCell.setCellStyle(styles.get("title"));titleCell.setCellValue(title);sheet.addMergedRegion(new CellRangeAddress(titleRow.getRowNum(), titleRow.getRowNum(), titleRow.getRowNum(),this.fields.size() - 1));}}/*** 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(is, 0);}/*** 对excel表单默认第一个索引名转换成list* * @param is 输入流* @param titleNum 标题占用行数* @return 转换后集合*/public List<T> importExcel(InputStream is, int titleNum) throws Exception{return importExcel(StringUtils.EMPTY, is, titleNum);}/*** 对excel表单指定表格索引名转换成list* * @param sheetName 表格索引名* @param titleNum 标题占用行数* @param is 输入流* @return 转换后集合*/public List<T> importExcel(String sheetName, InputStream is, int titleNum) throws Exception{this.type = Type.IMPORT;this.wb = WorkbookFactory.create(is);List<T> list = new ArrayList<T>();// 如果指定sheet名,则取指定sheet中的内容 否则默认指向第1个sheetSheet sheet = StringUtils.isNotEmpty(sheetName) ? wb.getSheet(sheetName) : wb.getSheetAt(0);if (sheet == null){throw new IOException("文件sheet不存在");}boolean isXSSFWorkbook = !(wb instanceof HSSFWorkbook);Map<String, PictureData> pictures;if (isXSSFWorkbook){pictures = getSheetPictures07((XSSFSheet) sheet, (XSSFWorkbook) wb);}else{pictures = getSheetPictures03((HSSFSheet) sheet, (HSSFWorkbook) wb);}// 获取最后一个非空行的行下标，比如总行数为n，则返回的为n-1int rows = sheet.getLastRowNum();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(titleNum);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.List<Object[]> fields = this.getFields();Map<Integer, Object[]> fieldsMap = new HashMap<Integer, Object[]>();for (Object[] objects : fields){Excel attr = (Excel) objects[1];Integer column = cellMap.get(attr.name());if (column != null){fieldsMap.put(column, objects);}}for (int i = titleNum + 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);// 判断当前行是否是空行if (isRowEmpty(row)){continue;}T entity = null;for (Map.Entry<Integer, Object[]> 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 = (Field) entry.getValue()[0];Excel attr = (Excel) entry.getValue()[1];// 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{String dateFormat = field.getAnnotation(Excel.class).dateFormat();if (StringUtils.isNotEmpty(dateFormat)){val = DateUtils.parseDateToStr(dateFormat, (Date) val);}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);}}else if (Boolean.TYPE == fieldType || Boolean.class == fieldType){val = Convert.toBool(val, false);}if (StringUtils.isNotNull(fieldType)){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());}else if (StringUtils.isNotEmpty(attr.dictType())){val = reverseDictByExp(Convert.toStr(val), attr.dictType(), attr.separator());}else if (!attr.handler().equals(ExcelHandlerAdapter.class)){val = dataFormatHandlerAdapter(val, attr);}else if (ColumnType.IMAGE == attr.cellType() && StringUtils.isNotEmpty(pictures)){PictureData image = pictures.get(row.getRowNum() + "_" + entry.getKey());if (image == null){val = "";}else{byte[] data = image.getData();val = FileUtils.writeImportBytes(data);}}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 list 导出数据集合* @param sheetName 工作表的名称* @return 结果*/public AjaxResult exportExcel(List<T> list, String sheetName){return exportExcel(list, sheetName, StringUtils.EMPTY);}/*** 对list数据源将其里面的数据导入到excel表单* * @param list 导出数据集合* @param sheetName 工作表的名称* @param title 标题* @return 结果*/public AjaxResult exportExcel(List<T> list, String sheetName, String title){this.init(list, sheetName, title, Type.EXPORT);return exportExcel();}/*** 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*/public void exportExcel(HttpServletResponse response, List<T> list, String sheetName){exportExcel(response, list, sheetName, StringUtils.EMPTY);}/*** 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* @param title 标题* @return 结果*/public void exportExcel(HttpServletResponse response, List<T> list, String sheetName, String title){response.setContentType("application/vnd.openxmlformats-officedocument.spreadsheetml.sheet");response.setCharacterEncoding("utf-8");this.init(list, sheetName, title, Type.EXPORT);exportExcel(response);}/*** 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 AjaxResult importTemplateExcel(String sheetName){return importTemplateExcel(sheetName, StringUtils.EMPTY);}/*** 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* @param title 标题* @return 结果*/public AjaxResult importTemplateExcel(String sheetName, String title){this.init(null, sheetName, title, Type.IMPORT);return exportExcel();}/*** 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){importTemplateExcel(response, sheetName, StringUtils.EMPTY);}/*** 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* @param title 标题* @return 结果*/public void importTemplateExcel(HttpServletResponse response, String sheetName, String title){response.setContentType("application/vnd.openxmlformats-officedocument.spreadsheetml.sheet");response.setCharacterEncoding("utf-8");this.init(null, sheetName, title, Type.IMPORT);exportExcel(response);}/*** 对list数据源将其里面的数据导入到excel表单* * @return 结果*/public void exportExcel(HttpServletResponse response){try{writeSheet();wb.write(response.getOutputStream());}catch (Exception e){log.error("导出Excel异常{}", e.getMessage());}finally{IOUtils.closeQuietly(wb);}}/*** 对list数据源将其里面的数据导入到excel表单* * @return 结果*/public AjaxResult exportExcel(){OutputStream out = null;try{writeSheet();String filename = encodingFilename(sheetName);out = new FileOutputStream(getAbsoluteFile(filename));wb.write(out);return AjaxResult.success(filename);}catch (Exception e){log.error("导出Excel异常{}", e.getMessage());throw new UtilException("导出Excel失败，请联系网站管理员！");}finally{IOUtils.closeQuietly(wb);IOUtils.closeQuietly(out);}}/*** 创建写入数据到Sheet*/public void writeSheet(){// 取出一共有多少个sheet.int sheetNo = Math.max(1, (int) Math.ceil(list.size() * 1.0 / sheetSize));for (int index = 0; index < sheetNo; index++){createSheet(sheetNo, index);// 产生一行Row row = sheet.createRow(rownum);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();}}}/*** 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 + rownum - 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];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);Font titleFont = wb.createFont();titleFont.setFontName("Arial");titleFont.setFontHeightInPoints((short) 16);titleFont.setBold(true);style.setFont(titleFont);styles.put("title", style);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);style = wb.createCellStyle();style.cloneStyleFrom(styles.get("data"));style.setAlignment(HorizontalAlignment.LEFT);styles.put("data1", style);style = wb.createCellStyle();style.cloneStyleFrom(styles.get("data"));style.setAlignment(HorizontalAlignment.CENTER);styles.put("data2", style);style = wb.createCellStyle();style.cloneStyleFrom(styles.get("data"));style.setAlignment(HorizontalAlignment.RIGHT);styles.put("data3", 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.setCellValue(StringUtils.isNull(value) ? attr.defaultValue() : value + attr.suffix());}else if (ColumnType.NUMERIC == attr.cellType()){if (StringUtils.isNotNull(value)){cell.setCellValue(StringUtils.contains(Convert.toStr(value), ".") ? Convert.toDouble(value) : Convert.toInt(value));}}else if (ColumnType.IMAGE == attr.cellType()){ClientAnchor anchor = new XSSFClientAnchor(0, 0, 0, 0, (short) cell.getColumnIndex(), cell.getRow().getRowNum(), (short) (cell.getColumnIndex() + 1), cell.getRow().getRowNum() + 1);String imagePath = Convert.toStr(value);if (StringUtils.isNotEmpty(imagePath)){byte[] data = ImageUtils.getImage(imagePath);getDrawingPatriarch(cell.getSheet()).createPicture(anchor,cell.getSheet().getWorkbook().addPicture(data, getImageType(data)));}}}/*** 获取画布*/public static Drawing<?> getDrawingPatriarch(Sheet sheet){if (sheet.getDrawingPatriarch() == null){sheet.createDrawingPatriarch();}return sheet.getDrawingPatriarch();}/*** 获取图片类型,设置图片插入类型*/public int getImageType(byte[] value){String type = FileTypeUtils.getFileExtendName(value);if ("JPG".equalsIgnoreCase(type)){return Workbook.PICTURE_TYPE_JPEG;}else if ("PNG".equalsIgnoreCase(type)){return Workbook.PICTURE_TYPE_PNG;}return Workbook.PICTURE_TYPE_JPEG;}/*** 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));}// 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(maxHeight);// 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);int align = attr.align().value();cell.setCellStyle(styles.get("data" + (align >= 1 && align <= 3 ? align : "")));// 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();String dictType = attr.dictType();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 (StringUtils.isNotEmpty(dictType) && StringUtils.isNotNull(value)){cell.setCellValue(convertDictByExp(Convert.toStr(value), dictType, separator));}else if (value instanceof BigDecimal && -1 != attr.scale()){cell.setCellValue((((BigDecimal) value).setScale(attr.scale(), attr.roundingMode())).toString());}else if (!attr.handler().equals(ExcelHandlerAdapter.class)){cell.setCellValue(dataFormatHandlerAdapter(value, attr));}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);}/*** 解析字典值* * @param dictValue 字典值* @param dictType 字典类型* @param separator 分隔符* @return 字典标签*/public static String convertDictByExp(String dictValue, String dictType, String separator){return DictUtils.getDictLabel(dictType, dictValue, separator);}/*** 反向解析值字典值* * @param dictLabel 字典标签* @param dictType 字典类型* @param separator 分隔符* @return 字典值*/public static String reverseDictByExp(String dictLabel, String dictType, String separator){return DictUtils.getDictValue(dictType, dictLabel, separator);}/*** 数据处理器* * @param value 数据值* @param excel 数据注解* @return*/public String dataFormatHandlerAdapter(Object value, Excel excel){try{Object instance = excel.handler().newInstance();Method formatMethod = excel.handler().getMethod("format", new Class[] { Object.class, String[].class });value = formatMethod.invoke(instance, value, excel.args());}catch (Exception e){log.error("不能格式化数据 " + excel.handler(), e.getMessage());}return Convert.toStr(value);}/*** 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){Row row = sheet.createRow(sheet.getLastRowNum() + 1);Set<Integer> keys = statistics.keySet();Cell 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();}}/*** 编码文件名*/public String encodingFilename(String filename){filename = UUID.randomUUID().toString() + "_" + filename + ".xlsx";return filename;}/*** 获取下载路径* * @param filename 文件名称*/public String getAbsoluteFile(String filename){String downloadPath = RuoYiConfig.getDownloadPath() + filename;File desc = new File(downloadPath);if (!desc.getParentFile().exists()){desc.getParentFile().mkdirs();}return downloadPath;}/*** 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.isNotNull(o) && 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 = getFields();this.fields = this.fields.stream().sorted(Comparator.comparing(objects -> ((Excel) objects[1]).sort())).collect(Collectors.toList());this.maxHeight = getRowHeight();}/*** 获取字段注解信息*/public List<Object[]> getFields(){List<Object[]> 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)){Excel attr = field.getAnnotation(Excel.class);if (attr != null && (attr.type() == Type.ALL || attr.type() == type)){field.setAccessible(true);fields.add(new Object[] { field, attr });}}// 多注解if (field.isAnnotationPresent(Excels.class)){Excels attrs = field.getAnnotation(Excels.class);Excel[] excels = attrs.value();for (Excel attr : excels){if (attr != null && (attr.type() == Type.ALL || attr.type() == type)){field.setAccessible(true);fields.add(new Object[] { field, attr });}}}}return fields;}/*** 根据注解获取最大行高*/public short getRowHeight(){double maxHeight = 0;for (Object[] os : this.fields){Excel excel = (Excel) os[1];maxHeight = maxHeight > excel.height() ? maxHeight : excel.height();}return (short) (maxHeight * 20);}/*** 创建一个工作簿*/public void createWorkbook(){this.wb = new SXSSFWorkbook(500);this.sheet = wb.createSheet();wb.setSheetName(0, sheetName);this.styles = createStyles(wb);}/*** 创建工作表* * @param sheetNo sheet数量* @param index 序号*/public void createSheet(int sheetNo, int index){// 设置工作表的名称.if (sheetNo > 1 && index > 0){this.sheet = wb.createSheet();this.createTitle();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.getCellType() == CellType.NUMERIC || cell.getCellType() == CellType.FORMULA){val = cell.getNumericCellValue();if (DateUtil.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.getCellType() == CellType.STRING){val = cell.getStringCellValue();}else if (cell.getCellType() == CellType.BOOLEAN){val = cell.getBooleanCellValue();}else if (cell.getCellType() == CellType.ERROR){val = cell.getErrorCellValue();}}}catch (Exception e){return val;}return val;}/*** 判断是否是空行* * @param row 判断的行* @return*/private boolean isRowEmpty(Row row){if (row == null){return true;}for (int i = row.getFirstCellNum(); i < row.getLastCellNum(); i++){Cell cell = row.getCell(i);if (cell != null && cell.getCellType() != CellType.BLANK){return false;}}return true;}/*** 获取Excel2003图片** @param sheet 当前sheet对象* @param workbook 工作簿对象* @return Map key:图片单元格索引（1_1）String，value:图片流PictureData*/public static Map<String, PictureData> getSheetPictures03(HSSFSheet sheet, HSSFWorkbook workbook){Map<String, PictureData> sheetIndexPicMap = new HashMap<String, PictureData>();List<HSSFPictureData> pictures = workbook.getAllPictures();if (!pictures.isEmpty()){for (HSSFShape shape : sheet.getDrawingPatriarch().getChildren()){HSSFClientAnchor anchor = (HSSFClientAnchor) shape.getAnchor();if (shape instanceof HSSFPicture){HSSFPicture pic = (HSSFPicture) shape;int pictureIndex = pic.getPictureIndex() - 1;HSSFPictureData picData = pictures.get(pictureIndex);String picIndex = String.valueOf(anchor.getRow1()) + "_" + String.valueOf(anchor.getCol1());sheetIndexPicMap.put(picIndex, picData);}}return sheetIndexPicMap;}else{return sheetIndexPicMap;}}/*** 获取Excel2007图片** @param sheet 当前sheet对象* @param workbook 工作簿对象* @return Map key:图片单元格索引（1_1）String，value:图片流PictureData*/public static Map<String, PictureData> getSheetPictures07(XSSFSheet sheet, XSSFWorkbook workbook){Map<String, PictureData> sheetIndexPicMap = new HashMap<String, PictureData>();for (POIXMLDocumentPart dr : sheet.getRelations()){if (dr instanceof XSSFDrawing){XSSFDrawing drawing = (XSSFDrawing) dr;List<XSSFShape> shapes = drawing.getShapes();for (XSSFShape shape : shapes){if (shape instanceof XSSFPicture){XSSFPicture pic = (XSSFPicture) shape;XSSFClientAnchor anchor = pic.getPreferredSize();CTMarker ctMarker = anchor.getFrom();String picIndex = ctMarker.getRow() + "_" + ctMarker.getCol();sheetIndexPicMap.put(picIndex, pic.getPictureData());}}}}return sheetIndexPicMap;}
}

四、撸代码

1、controller层

   /*** 导出商品列表*/@RequiresPermissions("system:product:export")@Log(title = "列表导出", businessType = BusinessType.EXPORT)@PostMapping("/export")@ResponseBodypublic AjaxResult export(SysProduct sysProduct){List<SysProduct> list = sysProductService.selectSysProductList(sysProduct);ExcelUtil<SysProduct> util = new ExcelUtil<SysProduct>(SysProduct.class);return util.exportExcel(list, "商品列表数据");}

2、service层

  @Overridepublic List<SysProduct> selectSysProductList(SysProduct sysProduct){return sysProductMapper.selectSysProductList(sysProduct);}

3、Mapper层

    public List<SysProduct> selectSysProductList(SysProduct sysProduct);

4、SQL

    <resultMap type="SysProduct" id="SysProductResult"><result property="id"    column="id"    /><result property="productname"    column="productname"    /><result property="specifications"    column="specifications"    /><result property="originalprice"    column="originalprice"    /><result property="price"    column="price"    /><result property="stock"    column="stock"    /><result property="dateofmanufacture"    column="dateofmanufacture"    /><result property="qualityguaranteeperiod"    column="qualityguaranteeperiod"    /><result property="imageurl"    column="imageurl"    /><result property="createtime"    column="createtime"    /><result property="updatetime"    column="updatetime"    /></resultMap><sql id="selectSysProductVo">select id, productname, specifications, originalprice, price, stock, dateofmanufacture, qualityguaranteeperiod, imageurl, createtime, updatetime from sys_product</sql><select id="selectSysProductList" parameterType="SysProduct" resultMap="SysProductResult"><include refid="selectSysProductVo"/><where>  <if test="productname != null  and productname != ''"> and productname like concat('%', #{productname}, '%')</if><if test="specifications != null  and specifications != ''"> and specifications = #{specifications}</if><if test="originalprice != null "> and originalprice = #{originalprice}</if><if test="price != null "> and price = #{price}</if><if test="stock != null  and stock != ''"> and stock = #{stock}</if><if test="dateofmanufacture != null "> and dateofmanufacture = #{dateofmanufacture}</if><if test="qualityguaranteeperiod != null  and qualityguaranteeperiod != ''"> and qualityguaranteeperiod = #{qualityguaranteeperiod}</if><if test="imageurl != null  and imageurl != ''"> and imageurl = #{imageurl}</if><if test="createtime != null "> and createtime = #{createtime}</if><if test="updatetime != null "> and updatetime = #{updatetime}</if></where></select>

五，页面处理

<!DOCTYPE html>
<html lang="zh" xmlns:th="http://www.thymeleaf.org" xmlns:shiro="http://www.pollix.at/thymeleaf/shiro">
<head><th:block th:include="include :: header('商品列表')" />
</head>
<body class="gray-bg"><div class="container-div"><div class="row"><div class="col-sm-12 search-collapse"><form id="formId"><div class="select-list"><ul><li><label>名称：</label><input type="text" name="productname"/></li><li><label>规格：</label><input type="text" name="specifications"/></li><li><label>原价：</label><input type="text" name="originalprice"/></li><li><label>现价：</label><input type="text" name="price"/></li><li><label>库存：</label><input type="text" name="stock"/></li><li><label>生产日期：</label><input type="text" class="time-input" placeholder="请选择生产日期" name="dateofmanufacture"/></li><li><label>保质期：</label><input type="text" name="qualityguaranteeperiod"/></li><li><label>图片路径：</label><input type="text" name="imageurl"/></li><li><label>创建时间：</label><input type="text" class="time-input" placeholder="请选择创建时间" name="createtime"/></li><li><label>更新时间：</label><input type="text" class="time-input" placeholder="请选择更新时间" name="updatetime"/></li><li><a class="btn btn-primary btn-rounded btn-sm" onclick="$.table.search()"><i class="fa fa-search"></i>&nbsp;搜索</a><a class="btn btn-warning btn-rounded btn-sm" onclick="$.form.reset()"><i class="fa fa-refresh"></i>&nbsp;重置</a></li></ul></div></form></div><div class="btn-group-sm" id="toolbar" role="group"><a class="btn btn-success" onclick="$.operate.add()" shiro:hasPermission="system:product:add"><i class="fa fa-plus"></i> 添加</a><a class="btn btn-primary single disabled" onclick="$.operate.edit()" shiro:hasPermission="system:product:edit"><i class="fa fa-edit"></i> 修改</a><a class="btn btn-danger multiple disabled" onclick="$.operate.removeAll()" shiro:hasPermission="system:product:remove"><i class="fa fa-remove"></i> 删除</a><a class="btn btn-warning" onclick="$.table.exportExcel()" shiro:hasPermission="system:product:export"><i class="fa fa-download"></i> 导出</a></div><div class="col-sm-12 select-table table-striped"><table id="bootstrap-table"></table></div></div></div><th:block th:include="include :: footer" /><script th:inline="javascript">var editFlag = [[${@permission.hasPermi('system:product:edit')}]];var removeFlag = [[${@permission.hasPermi('system:product:remove')}]];var prefix = ctx + "system/product";$(function() {var options = {url: prefix + "/list",createUrl: prefix + "/add",updateUrl: prefix + "/edit/{id}",removeUrl: prefix + "/remove",exportUrl: prefix + "/export",modalName: "【请填写功能名称】",columns: [{checkbox: true},{field: 'id',title: '${comment}',visible: false},{field: 'productname',title: '名称'},{field: 'specifications',title: '规格'},{field: 'originalprice',title: '原价'},{field: 'price',title: '现价'},{field: 'stock',title: '库存'},{field: 'dateofmanufacture',title: '生产日期'},{field: 'qualityguaranteeperiod',title: '保质期'},{field: 'imageurl',title: '图片路径'},{field: 'createtime',title: '创建时间'},{field: 'updatetime',title: '更新时间'},{title: '操作',align: 'center',formatter: function(value, row, index) {var actions = [];actions.push('<a class="btn btn-success btn-xs ' + editFlag + '" href="javascript:void(0)" onclick="$.operate.edit(\'' + row.id + '\')"><i class="fa fa-edit"></i>编辑</a> ');actions.push('<a class="btn btn-danger btn-xs ' + removeFlag + '" href="javascript:void(0)" onclick="$.operate.remove(\'' + row.id + '\')"><i class="fa fa-remove"></i>删除</a>');return actions.join('');}}]};$.table.init(options);});</script>
</body>
</html>

六，看效果

学习来自于:RuoYi:

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