利用Aspose.Cells完成easyUI中DataGrid数据的Excel导出功能

浏览数：25 / 时间：2015年06月09日

我准备在项目中实现该功能之前,google发现大部分代码都是利用一般处理程序 HttpHandler实现的服务器端数据的Excel导出,但是这样存在的问题是ashx读取的数据一般都是数据库中视图的数据，难免会含有方便操作的主键ID这列的记录。现在项目需要在easyUI的DataGrid中显示的数据能全部导出Excel，包括DataGrid中的中文标题，其他的统统不要。

完成该功能所需的工具和环境：Newtonsoft.Json序列化和反序列化类库、easyUI前端UI框架、HttpHandler一般处理程序、Aspose.Cells电子表格生成组件;.Net Framework4.0。

前端完成DataGrid中的题头和数据行信息遍历访问,并以JS中二维数组的形式返回后台供ashx程序处理.

  
    
    function 
ExportExcel() {
    // 返回grid的所有可见行给后端供导出Excel用
    var 
rows = $(‘#userlist‘).datagrid("getRows");
    if 
(rows.length == 0) {
        msgShow("没有数据可供导出");
        return;
    }
    //返回grid的所有列的选项title、列宽等
    // var columns = $(‘#userlist‘).datagrid("options").columns;
 
    //定制DataGrid的columns信息,只返回{field:,title:}
    var 
columns = new 
Array();
    var 
fields = $(‘#userlist‘).datagrid(‘getColumnFields‘);
    for 
(var 
i = 0; i < fields.length; i++) {
        var 
opts = $(‘#userlist‘).datagrid(‘getColumnOption‘, fields[i]);
        var 
column = new 
Object();
        column.field = opts.field;
        column.title = opts.title;
        columns.push(column);
    }
    var 
excelWorkSheet = new 
Object();
    excelWorkSheet.rows = rows;
    excelWorkSheet.columns = columns;
    excelWorkSheet.sheetName = "设置导出的Excel工作表名";
 
 
    var 
filename = "/HttpHandlers/<span style="color: 
#ff0000;">FileHandler.ashx?action=exportexcel&excelWorkSheet</span>=" + JSON.stringify(excelWorkSheet);
  
    location.href = filename;
}

　　其中FileHandler.ashx是公共的文件处理程序,根据action=Exportexcel来实现Excel导出功能.

  
    
    public 
void ProcessRequest(HttpContext context)
       {
           var 
action = context.Request["action"];
           switch 
(action.ToLower())
           {
               case 
"exportexcel":
                   <span style="color: #ff0000;">EasyUIGrid2Excel</span>(context);
                   break;
           }
 
 
       }

　　EasyUIGrid2Excel完成前台传递的关于Excel报表导出的参数,比如工作表名sheetName,题头标题和行记录。同时它完美解决了在各浏览器下文件名中文乱码问题，最后以弹窗的形式让用户选择直接打开还是下载。

  
    
    private 
void EasyUIGrid2Excel(HttpContext context)
       {
           
           var 
jsonString = context.Request["excelWorkSheet"];
       //使用Newtonsoft.Json.Linq.JObject将json字符串转化成结构不固定的Class类
           dynamic jsonObject =<span style="color: #ff0000;"> JObject.Parse</span>(jsonString);
 
          
 
           string 
fileName = String.Concat(jsonObject.sheetName, DateTime.Now.ToString("yyyyMMdd-HHmmss"), ".xls") ;
            
           //解决中文文件名乱码只在IE中有效
           //   filename = HttpUtility.UrlEncode(filename, System.Text.Encoding.UTF8);
           if 
(context.Request.UserAgent.ToLower().IndexOf("msie") > -1)
           {
               //当客户端使用IE时，对其进行编码；
               //使用 ToHexString 代替传统的 UrlEncode()；
               fileName = <span style="color: #ff0000;">CommonHelper.ToHexString</span>(fileName);
           }
           if 
(context.Request.UserAgent.ToLower().IndexOf("firefox") > -1)
           {
               //为了向客户端输出空格，需要在当客户端使用 Firefox 时特殊处理
                
               context.Response.AddHeader("Content-Disposition", "attachment;filename=\"" 
+ fileName + "\"");
           }
           else
               context.Response.AddHeader("Content-Disposition", "attachment;filename=" 
+ fileName);
 
           string 
extension = Path.GetExtension(fileName);
           context.Response.ContentType = <span style="color: #ff0000;">CommonHelper.GetMimeType</span>(extension);
           context.Response.ContentEncoding = Encoding.UTF8;
           Workbook workbook = <span style="color: #ff0000;">Object2Workbook</span>(jsonObject, context);
           context.Response.Clear();
           context.Response.Buffer = true;
 
           context.Response.BinaryWrite(workbook.SaveToStream().ToArray());
            
           context.Response.End();
       }

　　上面代码中的红色标注部分详见下载中的公共类库,其中Object2Workbook主要实现Aspose.cells中的Excel格式化输出定制,没有太多技巧,Aspose.cells还带有授权文件的哦,你懂的!

  
    
    private 
Workbook Object2Workbook(dynamic jsonObject, HttpContext context)
       {
           #region Aspose.Cell引用
           Aspose.Cells.License licExcel = new 
License();  //Aspose.Cells申明
           if 
(File.Exists(context.Server.MapPath("~/Bin/cellLic.lic")))
               licExcel.SetLicense(context.Server.MapPath("~/Bin/cellLic.lic"));
           #endregion
 
           Workbook workbook = new 
Workbook();
 
           Worksheet sheet = workbook.Worksheets[0];
 
 
           Styles styles = workbook.Styles;
           int 
styleIndex = styles.Add();
           Aspose.Cells.Style borderStyle = styles[styleIndex];
 
           borderStyle.Borders.DiagonalStyle = CellBorderType.None;
           borderStyle.HorizontalAlignment = TextAlignmentType.Center;//文字居中 
           Cells cells = sheet.Cells;
            sheet.FreezePanes(1, 1, 1, 0);//冻结第一行
           sheet.Name = jsonObject.sheetName;//接受前台的Excel工作表名
           
 
 
           //为标题设置样式     
           Style styleTitle = workbook.Styles[workbook.Styles.Add()];//新增样式 
           styleTitle.HorizontalAlignment = TextAlignmentType.Center;//文字居中 
           styleTitle.Font.Name = "宋体";//文字字体 
           styleTitle.Font.Size = 18;//文字大小 
           styleTitle.Font.IsBold = true;//粗体 
 
           //题头样式 
           Style styleHeader = workbook.Styles[workbook.Styles.Add()];//新增样式 
           styleHeader.HorizontalAlignment = TextAlignmentType.Center;//文字居中 
           styleHeader.Font.Name = "宋体";//文字字体 
           styleHeader.Font.Size = 14;//文字大小 
           styleHeader.Font.IsBold = true;//粗体 
           styleHeader.IsTextWrapped = true;//单元格内容自动换行 
           styleHeader.Borders[BorderType.LeftBorder].LineStyle = CellBorderType.Thin;
           styleHeader.Borders[BorderType.RightBorder].LineStyle = CellBorderType.Thin;
           styleHeader.Borders[BorderType.TopBorder].LineStyle = CellBorderType.Thin;
           styleHeader.Borders[BorderType.BottomBorder].LineStyle = CellBorderType.Thin;
 
           //内容样式
           Style styleContent = workbook.Styles[workbook.Styles.Add()];//新增样式 
           styleContent.HorizontalAlignment = TextAlignmentType.Center;//文字居中 
           styleContent.Font.Name = "宋体";//文字字体 
           styleContent.Font.Size = 12;//文字大小 
           styleContent.Borders[BorderType.LeftBorder].LineStyle = CellBorderType.Thin;
           styleContent.Borders[BorderType.RightBorder].LineStyle = CellBorderType.Thin;
           styleContent.Borders[BorderType.TopBorder].LineStyle = CellBorderType.Thin;
           styleContent.Borders[BorderType.BottomBorder].LineStyle = CellBorderType.Thin;
 
 
           var 
rowCount = jsonObject.rows.Count;//表格行数 
           var 
columnCount = jsonObject.columns.Count;//表格列数 
 
 
           //生成行1 标题行    
           cells.Merge(0, 0, 1, columnCount);//合并单元格 
           cells[0, 0].PutValue(jsonObject.sheetName);//填写内容 
           cells[0, 0].Style = styleTitle;
           cells.SetRowHeight(0, 25);
 
           //生成题头列行 
           for 
(int 
i = 0; i < columnCount; i++)
           {
               cells[1, i].PutValue(jsonObject.columns[i]["title"]);
               cells[1, i].Style = styleHeader;
               cells.SetRowHeight(1, 23);
           }
           //生成内容行,第三行起始
           //生成数据行 
           for 
(int 
i = 0; i < rowCount; i++)
           {
               for 
(int 
k = 0; k < columnCount; k++)
               {
                   var 
currentColumnName = jsonObject.columns[k]["field"];
                   cells[2 + i, k].PutValue(jsonObject.rows[i][currentColumnName.Value]);
                   cells[2 + i, k].Style = styleContent;
               }
                cells.SetRowHeight(2 + i, 22);
           }
            
 
           //添加制表日期
           cells[2 + rowCount, columnCount-1].PutValue("制表日期:" 
+ DateTime.Now.ToShortDateString());
           sheet.AutoFitColumns();//让各列自适应宽度
           sheet.AutoFitRows();//让各行自适应宽度
           return 
workbook;
       }