标签:style io ar os 使用 sp java for 文件
1.导出
//工作簿HSSFWorkbook
HSSFWorkbook hssfworkbook = new HSSFWorkbook();
//ISheet页
ISheet sheet1 = hssfworkbook.CreateSheet("员工资料");
//创建行
IRow rowHeader = sheet1.CreateRow(0);
//设置第一行中的每一个单元格
rowHeader.CreateCell(0, CellType.STRING).SetCellValue("工号");
//保存
using (Stream stream = File.OpenWrite(filename))
{
hssfworkbook.Write(stream);
}
2.设置样式
ICellStyle cellStyle = hssfworkbook.CreateCellStyle();
IDataFormat dataFormat = hssfworkbook.CreateDataFormat();
cellStyle.DataFormat = dataFormat.GetFormat("yyyy\"年\"m\"月\"d\"日\"");
//入职日期
ICell InDateCell = rowContent.CreateCell(3, CellType.NUMERIC);
InDateCell.CellStyle = cellStyle;
InDateCell.SetCellValue(item.InDate);
//设置Excel表格
3.设置宽度
在使用NPOI技术开发自动操作EXCEL软件时遇到不能精确设置列宽的问题。
如
ISheet sheet1 = hssfworkbook.CreateSheet("Sheet1");
sheet1.SetColumnWidth(0, 50 * 256); // 在EXCEL文档中实际列宽为49.29
sheet1.SetColumnWidth(1, 100 * 256); // 在EXCEL文档中实际列宽为99.29
sheet1.SetColumnWidth(2, 150 * 256); // 在EXCEL文档中实际列宽为149.29
到此一般人应该知道问题出在哪了,解决方法如下:
ISheet sheet1 = hssfworkbook.CreateSheet("Sheet1");
sheet1.SetColumnWidth(0, (int)((50 + 0.72) * 256)); // 在EXCEL文档中实际列宽为50
sheet1.SetColumnWidth(1, (int)((100 + 0.72) * 256)); // 在EXCEL文档中实际列宽为100
sheet1.SetColumnWidth(2, (int)((150 + 0.72) * 256)); // 在EXCEL文档中实际列宽为150
既在要设置的实际列宽中加上列宽基数:0.72
NPOI读写Excel
1、整个Excel表格叫做工作表:WorkBook(工作薄),包含的叫页(工作表):Sheet;行:Row;单元格Cell。
2、NPOI是POI的C#版本,NPOI的行和列的index都是从0开始
3、POI读取Excel有两种格式一个是HSSF,另一个是XSSF。 HSSF和XSSF的区别如下:
HSSF is the POI Project‘s pure Java implementation of the Excel ‘97(-2007) file format.
XSSF is the POI Project‘s pure Java implementation of the Excel 2007 OOXML (.xlsx) file format.
即:HSSF适用2007以前的版本,XSSF适用2007版本及其以上的。
下面是用NPOI读写Excel的例子:ExcelHelper封装的功能主要是把DataTable中数据写入到Excel中,或者是从Excel读取数据到一个DataTable中。
ExcelHelper类:
using System; using System.Collections.Generic; using System.Linq; using System.Text; using NPOI.SS.UserModel; using NPOI.XSSF.UserModel; using NPOI.HSSF.UserModel; using System.IO; using System.Data; namespace GMapDemo { class ExcelHelper : IDisposable { private string fileName = null; //文件名 private IWorkbook workbook = null; private FileStream fs = null; private bool disposed; public ExcelHelper(string fileName) { this.fileName = fileName; disposed = false; } /// <summary> /// 将DataTable数据导入到excel中 /// </summary> /// <param name="data">要导入的数据</param> /// <param name="isColumnWritten">DataTable的列名是否要导入</param> /// <param name="sheetName">要导入的excel的sheet的名称</param> /// <returns>导入数据行数(包含列名那一行)</returns> public int DataTableToExcel(DataTable data, string sheetName, bool isColumnWritten) { int i = 0; int j = 0; int count = 0; ISheet sheet = null; fs = new FileStream(fileName, FileMode.OpenOrCreate, FileAccess.ReadWrite); if (fileName.IndexOf(".xlsx") > 0) // 2007版本 workbook = new XSSFWorkbook(); else if (fileName.IndexOf(".xls") > 0) // 2003版本 workbook = new HSSFWorkbook(); try { if (workbook != null) { sheet = workbook.CreateSheet(sheetName); } else { return -1; } if (isColumnWritten == true) //写入DataTable的列名 { IRow row = sheet.CreateRow(0); for (j = 0; j < data.Columns.Count; ++j) { row.CreateCell(j).SetCellValue(data.Columns[j].ColumnName); } count = 1; } else { count = 0; } for (i = 0; i < data.Rows.Count; ++i) { IRow row = sheet.CreateRow(count); for (j = 0; j < data.Columns.Count; ++j) { row.CreateCell(j).SetCellValue(data.Rows[i][j].ToString()); } ++count; } workbook.Write(fs); //写入到excel return count; } catch (Exception ex) { Console.WriteLine("Exception: " + ex.Message); return -1; } } /// <summary> /// 将excel中的数据导入到DataTable中 /// </summary> /// <param name="sheetName">excel工作薄sheet的名称</param> /// <param name="isFirstRowColumn">第一行是否是DataTable的列名</param> /// <returns>返回的DataTable</returns> public DataTable ExcelToDataTable(string sheetName, bool isFirstRowColumn) { ISheet sheet = null; DataTable data = new DataTable(); int startRow = 0; try { fs = new FileStream(fileName, FileMode.Open, FileAccess.Read); if (fileName.IndexOf(".xlsx") > 0) // 2007版本 workbook = new XSSFWorkbook(fs); else if (fileName.IndexOf(".xls") > 0) // 2003版本 workbook = new HSSFWorkbook(fs); if (sheetName != null) { sheet = workbook.GetSheet(sheetName); } else { sheet = workbook.GetSheetAt(0); } if (sheet != null) { IRow firstRow = sheet.GetRow(0); int cellCount = firstRow.LastCellNum; //一行最后一个cell的编号 即总的列数 if (isFirstRowColumn) { for (int i = firstRow.FirstCellNum; i < cellCount; ++i) { DataColumn column = new DataColumn(firstRow.GetCell(i).StringCellValue); data.Columns.Add(column); } startRow = sheet.FirstRowNum + 1; } else { startRow = sheet.FirstRowNum; } //最后一列的标号 int rowCount = sheet.LastRowNum; for (int i = startRow; i <= rowCount; ++i) { IRow row = sheet.GetRow(i); if (row == null) continue; //没有数据的行默认是null DataRow dataRow = data.NewRow(); for (int j = row.FirstCellNum; j < cellCount; ++j) { if (row.GetCell(j) != null) //同理,没有数据的单元格都默认是null dataRow[j] = row.GetCell(j).ToString(); } data.Rows.Add(dataRow); } } return data; } catch (Exception ex) { Console.WriteLine("Exception: " + ex.Message); return null; } } public void Dispose() { Dispose(true); GC.SuppressFinalize(this); } protected virtual void Dispose(bool disposing) { if (!this.disposed) { if (disposing) { if (fs != null) fs.Close(); } fs = null; disposed = true; } } } }
标签:style io ar os 使用 sp java for 文件
原文地址:http://www.cnblogs.com/mcad/p/4124035.html