NPOI导出Excel文件的文章很多了,但是没看到easy-uidatagrid表格直接导出Excel文件的,要显示中文Title和Excel文件每列列宽和页面上看到的基本相符。这里可能是个实现,不是最佳,写出来给有用的人参考。可能在通用二字上做得还不是特别好,有好的方法请留言指正。
效果:
编码过程:
1、js
//----------------------------------------------------- // @description 返回grid的(可见的)所有行给后端导出Excel用 @param {string} table 表格ID @returns rows @author 肖峰------------------------------------------------------ function getGridDataToExcelExport(table) { var allRows = $("#" + table).datagrid("getRows"); return allRows; } @description 返回grid的所有列 @author 肖峰 function getGridColumnFields(table) { var allCols = $("#" + table).datagrid("getColumnFields"); return allCols; } @description 返回grid的所有列的选项title、列宽等function getGridColumnFieldsOptions(table) { var allColsTitle = $("#" + table).datagrid("options").columns; return allColsTitle; } 导出结果集到Excel function exportGrid() { if (getGridDataToExcelExport("ResultGrid").length == 0) { alertMsg("系统提示","记录数为0,不需要导出!","error"); return; } var entity = {}; entity.GridRows = getGridDataToExcelExport("ResultGrid"); entity.GridColumnOptions = getGridColumnFieldsOptions("ResultGrid"); entity.ExportFileName = '产品箱盒对应查询结果.xls'; POVOS.BarCode.Website.BoxCorrespondingQuery.ExportGridToExcelFileAndDownload(entity,function (p) { location.href = "ExportExcelFile.ashx?ExcelFileID=" + p.value; }); } var entity = {}; entity.GridRows = getGridDataToExcelExport("ResultGrid"); entity.GridColumnOptions = getGridColumnFieldsOptions("ResultGrid"); entity.ExportFileName = '产品物流流向查询结果.xls'; POVOS.BarCode.Website.ProductTransQuery.ExportGridToExcelFileAndDownload(entity,255)">function (p) { location.href = "ExportExcelFile.ashx?ExcelFileID="+p.value; }); }
2、后台代码,前台使用ajaxpro2调用后台方法,传递前端页面grid行列记录的Json格式。
/// <summary> /// 形成Excel对应的文件流存在数据库里,返回给前端File GUID </summary> <param name="entity"></param> <returns></returns> [AjaxMethod] public string ExportGridToExcelFileAndDownload(JavaScriptObject entity) { var gridRows = (JavaScriptArray)entity["GridRows"]; var gridOptions = (JavaScriptArray)entity[GridColumnOptionsvar gridOptionList = (JavaScriptArray)gridOptions[0]; 可见的列 List<JavaScriptObject> gridCols = new List<JavaScriptObject>(); foreach (JavaScriptObject j in gridOptionList) { if (j.Value.IndexOf(hidden") == -1) { gridCols.Add(j); } } var fileName = entity[ExportFileName"].ToString(); string tempFileName = AppDomain.CurrentDomain.BaseDirectory + CommonExcelFile.xls"; FileStream fs = new FileStream(tempFileName,FileMode.Open,FileAccess.Read); var workBook = new HSSFWorkbook(fs); workBook.SetSheetName(0,查询结果"); var sheet = workBook.GetSheetAt(0); 表头(列),第一行 int newColIndex = 0; var titleRow = sheet.CreateRow(newColIndex); int cIndex = in gridCols) { titleRow.CreateCell(cIndex).SetCellValue(j[title"].ToString()); int width = int.Parse(j[width"].ToString()) / 6; if (width > 255) width = 250; sheet.SetColumnWidth(cIndex,width*256); cIndex++; } 行记录 for (int rowIndex = 0; rowIndex < gridRows.Count; rowIndex++) { newColIndex++; var row = sheet.CreateRow(newColIndex); var jsonEntity = gridRows[rowIndex] as JavaScriptObject; int colIndex = 0; colIndex < gridCols.Count; colIndex++) { string cellValue = string.Empty; JavaScriptObject colOption = (JavaScriptObject)gridCols[colIndex]; string field = colOption[field"].ToString(); if (jsonEntity[field] != null) cellValue = jsonEntity[field].ToString(); row.CreateCell(colIndex).SetCellValue(cellValue); } } MemoryStream newFile = new MemoryStream(); sheet.Workbook.Write(newFile); using (POVOSEntities db = new POVOSEntities()) { var resultFile = new ExportFileEntity(); resultFile.FileGuid = Guid.NewGuid(); resultFile.FileName = fileName; resultFile.FileCreateDateTime = DateTime.Now; resultFile.FileStreamByte = newFile.GetBuffer(); db.AddToExportFileEntity(resultFile); db.SaveChanges(); return resultFile.FileGuid.ToString(); } }
3、文件下载使用一般处理程序,接收QueryString里传的文件ID,返回给前端Excel文件。
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.SessionState;
using NPOI.SS.UserModel;
using NPOI.HSSF.UserModel;
using BarCode.DataAccess;
namespace POVOS.BarCode.Website
{
<summary>
读取数据库Excel文件并下载
</summary>
class ExportExcelFile : IHttpHandler,IRequiresSessionState
{
void ProcessRequest(HttpContext context)
{
new POVOSEntities())
{
Guid fileID = new Guid(context.Request[ExcelFileID"] as string);
var fileEntity = db.ExportFileEntity.Where(e => e.FileGuid == fileID).FirstOrDefault();
string filename = string.Format([{0}]{1}",DateTime.Now.ToString(yyMMddHHmmss"),fileEntity.FileName);
context.Response.ContentType = application/vnd.ms-excel";
context.Response.AddHeader(Content-Dispositionattachment;filename={0}",context.Server.UrlEncode(filename)));
context.Response.Clear();
context.Response.BinaryWrite(fileEntity.FileStreamByte);
context.Response.End();
}
}
bool IsReusable
{
get
{
return false;
}
}
}
}
总结一下,遇到以下几个问题:
1、如何传递datagrid的行列记录到后置代码里,形成Excel文件。
2、NPOI的使用,如果控制列宽,对齐样式等。
4、解析前端页面传递过来的JSON,比如某些列没有"hidden"选项等。
原文链接:https://www.f2er.com/ajax/166552.html