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+using System.IO;
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+using System.Data;
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+using System;
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+using NPOI.HSSF.UserModel;
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+using NPOI.SS.UserModel;
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+using NPOI.HSSF.Util;
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+using NPOI.SS.Formula.Eval;
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+using System.Text;
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+
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+namespace Check.DataOperate
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+{
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+ class ExcelHandler
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+ {
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+ DataHelper dh = new DataHelper();
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+ /// <summary>
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+ /// 导出Excel,返回文件在客户端的路径
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+ /// </summary>
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+ public string ExportExcel(DataTable dt, string FolderPath)
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+ {
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+ //创建一个内存流，用来接收转换成Excel的内容
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+ MemoryStream ms;
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+ ms = DataTableToExcel(dt);
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+ //以系统当前时间命名文件，FileMode.Create表示创建文件，FileAccess.Write表示拥有写的权限
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+ string filePath = @FolderPath + "\\" + DateTime.Now.ToString("yyyyMMddHHmmss") + ".xls";
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+ FileStream fs = new FileStream(filePath, FileMode.Create, FileAccess.Write);
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+ byte[] data = ms.ToArray();
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+ fs.Write(data, 0, data.Length);
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+ fs.Flush();
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+ //释放当前Excel文件，否则打开文件的时候会显示文件被占用
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+ ms.Dispose();
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+ fs.Dispose();
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+ return filePath;
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+ }
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+
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+ /// <summary>
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+ /// 导入Excel
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+ /// </summary>
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+ public DataTable ImportExcel(string FolderPath, string TableName)
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+ {
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+ DataTable dt = new DataTable();
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+ dt.TableName = TableName;
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+ if (FolderPath.Contains(".xls") || FolderPath.Contains(".xlsx"))
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+ {
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+ using (FileStream file = new FileStream(FolderPath, FileMode.Open, FileAccess.Read))
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+ {
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+ //获取文件流
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+ HSSFWorkbook workbook = new HSSFWorkbook(file);
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+ ISheet sheet = workbook.GetSheetAt(0);
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+ //获取所有的列名
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+ foreach (ICell item in sheet.GetRow(sheet.FirstRowNum).Cells)
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+ {
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+ dt.Columns.Add(item.ToString(), typeof(string));
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+ }
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+
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+ System.Collections.IEnumerator rows = sheet.GetRowEnumerator();
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+ while (rows.MoveNext())
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+ {
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+ IRow row = (HSSFRow)rows.Current;
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+ if (row.RowNum == sheet.FirstRowNum)
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+ {
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+ continue;
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+ }
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+
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+ DataRow dr = dt.NewRow();
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+ foreach (ICell item in row.Cells)
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+ {
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+ switch (item.CellType)
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+ {
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+ case CellType.BOOLEAN:
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+ dr[item.ColumnIndex] = item.BooleanCellValue;
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+ break;
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+ case CellType.ERROR:
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+ dr[item.ColumnIndex] = ErrorEval.GetText(item.ErrorCellValue);
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+ break;
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+ case CellType.FORMULA:
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+ switch (item.CachedFormulaResultType)
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+ {
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+ case CellType.BOOLEAN:
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+ dr[item.ColumnIndex] = item.BooleanCellValue;
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+ break;
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+ case CellType.ERROR:
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+ dr[item.ColumnIndex] = ErrorEval.GetText(item.ErrorCellValue);
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+ break;
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+ case CellType.NUMERIC:
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+ if (DateUtil.IsCellDateFormatted(item))
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+ {
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+ dr[item.ColumnIndex] = item.DateCellValue.ToString("yyyy-MM-dd hh:MM:ss");
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+ }
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+ else
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+ {
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+ dr[item.ColumnIndex] = item.NumericCellValue;
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+ }
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+ break;
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+ case CellType.STRING:
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+ string str = item.StringCellValue;
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+ if (!string.IsNullOrEmpty(str))
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+ {
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+ dr[item.ColumnIndex] = str.ToString();
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+ }
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+ else
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+ {
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+ dr[item.ColumnIndex] = null;
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+ }
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+ break;
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+ case CellType.Unknown:
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+ case CellType.BLANK:
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+ default:
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+ dr[item.ColumnIndex] = string.Empty;
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+ break;
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+ }
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+ break;
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+ case CellType.NUMERIC:
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+ if (DateUtil.IsCellDateFormatted(item))
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+ {
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+ dr[item.ColumnIndex] = item.DateCellValue.ToString("yyyy-MM-dd hh:MM:ss");
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+ }
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+ else
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+ {
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+ dr[item.ColumnIndex] = item.NumericCellValue;
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+ }
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+ break;
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+ case CellType.STRING:
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+ string strValue = item.StringCellValue;
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+ if (string.IsNullOrEmpty(strValue))
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+ {
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+ dr[item.ColumnIndex] = strValue.ToString();
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+ }
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+ else
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+ {
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+ dr[item.ColumnIndex] = null;
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+ }
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+ break;
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+ case CellType.Unknown:
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+ case CellType.BLANK:
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+ default:
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+ dr[item.ColumnIndex] = string.Empty;
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+ break;
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+ }
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+ }
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+ dt.Rows.Add(dr);
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+ }
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+ }
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+ }
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+ return dt;
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+ }
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+
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+ public void WriteTxt(DataTable dt, string FolderPath, string FileName)
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+ {
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+ StreamWriter sr;
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+ string filePath = @FolderPath;
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+ string report;
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+ if (File.Exists(filePath + "\\" + FileName)) //如果文件存在,则创建File.AppendText对象
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+ {
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+ File.Delete(filePath + "\\" + FileName);
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+ }
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+ sr = File.CreateText(filePath + "\\" + FileName);
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+ StringBuilder sb = new StringBuilder();
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+ string Title = "";
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+ foreach (DataColumn dc in dt.Columns)
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+ {
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+ Title += String.Format("{0,10}", dc.ColumnName.ToString());
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+ }
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+ sr.WriteLine(Title + "\r");
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+ foreach (DataRow dr in dt.Rows)
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+ {
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+ string text = "";
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+ for (int i = 0; i < dt.Columns.Count; i++)
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+ {
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+ text += String.Format("{0,10}", dr[i].ToString());
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+ }
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+ sr.WriteLine(text + "\r");
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+ }
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+ sr.Close();
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+ }
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+
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+ /// <summary>
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+ /// 将DataTable形式的数据转成Excel格式的，然后用字节流的形式写入文件
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+ /// </summary>
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+ /// <param name="DataTable"></param>
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+ /// <returns></returns>
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+ public MemoryStream DataTableToExcel(DataTable DataTable)
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+ {
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+ //创建内存流
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+ MemoryStream ms = new MemoryStream();
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+ //创建一个Book，相当于一个Excel文件
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+ HSSFWorkbook book = new HSSFWorkbook();
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+ //Excel中的Sheet
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+ ISheet sheet = book.CreateSheet("sheet1");
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+ //获取行数量和列数量
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+ int rowNum = DataTable.Rows.Count;
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+ int columnNum = DataTable.Columns.Count;
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+ //设置列的宽度，根据首行的列的内容的长度来设置
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+ for (int i = 0; i < columnNum; i++)
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+ {
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+ int dataLength = DataTable.Columns[i].ColumnName.Length;
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+ sheet.SetColumnWidth(i, dataLength * 700);
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+ }
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+ //首先画好第一行带颜色的，单独写出来，避免写在循环里面
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+ IRow row = sheet.CreateRow(0);
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+ //冻结第一行
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+ sheet.CreateFreezePane(0, 1, 0, 1);
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+ ICellStyle style = book.CreateCellStyle();
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+ style.FillForegroundColor = HSSFColor.PALE_BLUE.index;
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+ style.FillPattern = FillPatternType.BIG_SPOTS;
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+ style.FillBackgroundColor = HSSFColor.LIGHT_GREEN.index;
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+ //设置边框
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+ style.BorderBottom = BorderStyle.THICK;
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+ style.BorderLeft = BorderStyle.THICK;
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+ style.BorderRight = BorderStyle.THICK;
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+ style.BorderTop = BorderStyle.THICK;
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+ row.HeightInPoints = 20;
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+ //固定第一行
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+ //row.RowStyle.IsLocked=true;
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+ //给第一行的标签赋值样式和值
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+ for (int j = 0; j < columnNum; j++)
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+ {
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+ row.CreateCell(j);
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+ row.Cells[j].CellStyle = style;
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+ row.Cells[j].CellStyle.VerticalAlignment = VerticalAlignment.CENTER;
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+ row.Cells[j].CellStyle.Alignment = HorizontalAlignment.CENTER;
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+ row.Cells[j].SetCellValue(DataTable.Columns[j].ColumnName);
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+ }
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+
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+ //将DataTable的值循环赋值给book，Aligment设置居中
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+ //之前已经画了带颜色的第一行，所以从i=1开始画
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+ for (int i = 0; i < rowNum; i++)
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+ {
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+ IRow row1 = sheet.CreateRow(i + 1);
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+ row1.HeightInPoints = 20;
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+ for (int j = 0; j < columnNum; j++)
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+ {
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+ row1.CreateCell(j);
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+ row1.Cells[j].SetCellValue(DataTable.Rows[i][j].ToString());
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+ row1.GetCell(j).CellStyle.VerticalAlignment = VerticalAlignment.CENTER;
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+ }
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+ }
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+ //将book的内容写入内存流中返回
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+ book.Write(ms);
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+ return ms;
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+ }
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+ }
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+}
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