content: 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 org.apache.poi.hssf.usermodel.HSSFDateUtil;
  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.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.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.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.CellRangeAddressList;
  import org.apache.poi.xssf.streaming.SXSSFWorkbook;
  import org.apache.poi.xssf.usermodel.XSSFDataValidation;
  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.Global;
  import com.ruoyi.common.core.domain.AjaxResult;
  import com.ruoyi.common.core.text.Convert;
  import com.ruoyi.common.exception.BusinessException;
  import com.ruoyi.common.utils.DateUtils;
  import com.ruoyi.common.utils.StringUtils;
  import com.ruoyi.common.utils.reflect.ReflectUtils;
  import com.ruoyi.common.utils.spring.SpringUtils;
  
  /**
   * 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());
                      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
                          {
                              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);
                          }
                      }
                      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());
                          }
                          else if (StringUtils.isNotEmpty(attr.dictType()))
                          {
                              val = reverseDictByExp(Convert.toStr(val), attr.dictType(), 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 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)
      {
          this.init(list, sheetName, Type.EXPORT);
          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 AjaxResult importTemplateExcel(String sheetName)
      {
          this.init(null, sheetName, Type.IMPORT);
          return exportExcel();
      }
  
      /**
       * 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
          {
              // 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();
                  }
              }
              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 BusinessException("导出Excel失败，请联系网站管理员！");
          }
          finally
          {
              if (wb != null)
              {
                  try
                  {
                      wb.close();
                  }
                  catch (IOException e1)
                  {
                      e1.printStackTrace();
                  }
              }
              if (out != null)
              {
                  try
                  {
                      out.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();
                  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
                  {
                      // 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
       * @throws Exception
       */
      public static String convertByExp(String propertyValue, String converterExp, String separator) throws Exception
      {
          StringBuilder propertyString = new StringBuilder();
          try
          {
              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];
                      }
                  }
              }
          }
          catch (Exception e)
          {
              throw e;
          }
          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
       * @throws Exception
       */
      public static String reverseByExp(String propertyValue, String converterExp, String separator) throws Exception
      {
          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) throws Exception
      {
          Object bean = SpringUtils.getBean("dictUtils");
          String methodName = "getDictLabel";
          Method method = bean.getClass().getDeclaredMethod(methodName, String.class, String.class, String.class);
          return Convert.toStr(method.invoke(bean, 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) throws Exception
      {
          Object bean = SpringUtils.getBean("dictUtils");
          String methodName = "getDictValue";
          Method method = bean.getClass().getDeclaredMethod(methodName, String.class, String.class, String.class);
          return Convert.toStr(method.invoke(bean, dictType, dictLabel, 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();
          }
      }
  
      /**
       * 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 = Global.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.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;
      }
  }