使用net core 6 c# 的 NPOI 包，读取excel..xlsx单元格内的图片，并存储到指定服务器

畅聊科技

2024-04-26 帮助1人

这个是记录，单元格的图片。

学新通

using ICSharpCode.SharpZipLib.Zip;
using Microsoft.AspNetCore.Mvc;
using NPOI.HSSF.UserModel;
using NPOI.SS.UserModel;
using NPOI.XSSF.UserModel;
using System.Data;
using System.Xml;
namespace ExcelOption.Controllers
{
[ApiController]
[Route("[controller]")]
public class ImportExcelController : ControllerBase
{
private readonly Microsoft.AspNetCore.Hosting.IHostingEnvironment _hostingEnvironment;
public ImportExcelController(Microsoft.AspNetCore.Hosting.IHostingEnvironment hostingEnvironment)
{
_hostingEnvironment = hostingEnvironment;
}
[HttpGet(Name = "dele")]
public bool dele()
{
string zipFileName = "filezip" ".zip";
string xlsxFileName = "filexlsx" ".xlsx";
var mapPath = _hostingEnvironment.ContentRootPath;
//业务逻辑处理完了就把原来的文件和解压的文件夹删除
Directory.Delete(mapPath @"\" "filezip", true);
System.IO.File.Delete(mapPath @"\" xlsxFileName);
//File.Delete(mapPath "\\" xlsxFileName);
System.IO.File.Delete(mapPath @"\" zipFileName);
return true;
}
[HttpPost(Name = "ImportExcel_Img")]
public bool ImportExcel_Img(IFormFileCollection files)
{
if (files.Count > 0)
{
var file = files[0];
//读取导入的文件类型
var fileExt = file.FileName.Substring(file.FileName.LastIndexOf('.')).ToLower();
if (!fileExt.Equals(".xlsx"))
{
//提示文件类型不正确
return false;
}
//转换保存zip
string zipFileName = "filezip" ".zip";
string xlsxFileName = "filexlsx" ".xlsx";
var mapPath = _hostingEnvironment.ContentRootPath;
//保存xlsx到服务器
using (var stream = new FileStream(mapPath xlsxFileName, FileMode.OpenOrCreate, FileAccess.ReadWrite))
{
file.CopyToAsync(stream);
}
//保存zip到服务器
using (var stream = new FileStream(mapPath zipFileName, FileMode.OpenOrCreate, FileAccess.ReadWrite))
{
file.CopyToAsync(stream);
}
var dt = ExcelHelper.ExcelToDataTable(mapPath xlsxFileName);
//解压，如果解压成功则根据xml处理 (应为方便我就放在ExcelHelper里面了)
if (UnZipFile(mapPath zipFileName, out string path))
{
//excel 图片信息
List<o_ExcelImgModel> o_ExcelImgModelList = new List<o_ExcelImgModel>();
//图片路径文件夹
var mediaFolderPath = path @"xl\media";
//判断是否存在此文件夹如果有则处理（如果没有图片他是不会有这个文件夹的）
if (System.IO.Directory.Exists(mediaFolderPath))
{
//解压成功获取xml 节点做处理
var exclNode = GetXmlExclNodeList(path);
var pictNode = GetXmlPictNodeList(path);
//获取图片信息与地址
foreach (var nl in exclNode)
{
XmlElement sondNode = (XmlElement)nl;
XmlNodeList descendDodeList = sondNode.ChildNodes;
XmlNodeList picNodeList = descendDodeList[0].ChildNodes;
XmlNodeList nvPicPrNodeList = picNodeList[0].ChildNodes;
XmlElement cNvPrElement = (XmlElement)nvPicPrNodeList.Item(0);
string name = cNvPrElement.GetAttribute("name").ToString();
XmlNodeList blipFillNodeList = picNodeList[1].ChildNodes;
XmlElement picElement = (XmlElement)blipFillNodeList.Item(0);
string id = picElement.GetAttribute("r:embed").ToString();
foreach (XmlNode xn in pictNode)
{
XmlElement xe = (XmlElement)xn;
if (xe.GetAttribute("Id").ToString() == id)
{
var pathOfPicture = xe.GetAttribute("Target").ToString().Replace("..", "").Replace("/", @"\");
pathOfPicture = path @"xl\" pathOfPicture;
o_ExcelImgModelList.Add(new o_ExcelImgModel()
{
ID = id,
Name = name,
PathOfPicture = pathOfPicture
});
break;
}
}
}
//图片对应dt的哪一列，存到dt然后再循环dt去处理（这个是小编的思维，如果有更好的做法可以随缘发挥）
foreach (var item in o_ExcelImgModelList)
{
//item.PathOfPicture 图片路径取到了，此时你可以存储了
}
}
//现在dt某一列存放了图片的绝对路径就可以通过table去处理了
//循环表插入数据及上传
foreach (DataRow item in dt.Rows)
{
//此时你excel转换的 dataTable表的图片字段的值是："_xlfn.DISPIMG(\"ID_CD49305586E940EF8F78CD3B54A4BCD3\",1)"
item["用户名"].ToString(); //"zhao1"
//var kkl= item["IMG"].ToString(); // "_xlfn.DISPIMG(\"ID_CD49305586E940EF8F78CD3B54A4BCD3\",1)"
var breakApart = item["IMG"].ToString().Split('\\', '"')[1];
var imgPath= o_ExcelImgModelList.FirstOrDefault(x => x.Name == breakApart);
//获取图片然后做上传逻辑，这个自己实现我就不多讲了
}
}
else
{
//解压时报直接返回，这个返回啥类型或者啥数据自己定义就好我这边demo 随缘来个bool意思下
return false;
}
//业务逻辑处理完了就把原来的文件和解压的文件夹删除
Directory.Delete(mapPath "\\" "filezip", true);
System.IO.File.Delete(mapPath "\\" xlsxFileName);
//File.Delete(mapPath "\\" xlsxFileName);
System.IO.File.Delete(mapPath "\\" zipFileName);
}
return true;
}
public static string MidStrEx(string sourse, string startstr, string endstr)
{
string result = string.Empty;
int startindex, endindex;
try
{
startindex = sourse.IndexOf(startstr);
if (startindex == -1)
return result;
string tmpstr = sourse.Substring(startindex startstr.Length);
endindex = tmpstr.IndexOf(endstr);
if (endindex == -1)
return result;
result = tmpstr.Remove(endindex);
}
catch (Exception ex)
{
Console.Write("MidStrEx Err:" ex.Message);
}
return result;
}
/// <summary>
/// Xml图片表格位置及路径ID
/// </summary>
private const string _XmlExcel = @"xl\cellimages.xml";
/// <summary>
/// Xml图片路径
/// </summary>
private const string _XmlPict = @"xl\_rels\cellimages.xml.rels";
/// <summary>
/// 获取图片路径 Xml节点
/// </summary>
/// <param name="path">解压后的文件夹路径</param>
/// <returns></returns>
private XmlNodeList GetXmlPictNodeList(string path)
{
XmlDocument doc = new XmlDocument();
doc.Load(path _XmlPict);
XmlNode root = doc.DocumentElement;
return root.ChildNodes;
}
/// <summary>
/// 获取图片表格位置及路径ID Xml节点
/// </summary>
/// <param name="path">解压后的文件夹路径</param>
/// <returns></returns>
private XmlNodeList GetXmlExclNodeList(string path)
{
XmlDocument doc = new XmlDocument();
doc.Load(path _XmlExcel);
XmlNode root = doc.DocumentElement;
return root.ChildNodes;
}
/// <summary>
/// 解压文件
/// </summary>
/// <param name="zipFilePath">压缩文件路径</param>
/// <param name="path">返回压缩文件夹路径</param>
/// <param name="unZipDir">解压文件存放路径,为空时默认与压缩文件同一级目录下，跟压缩文件同名的文件夹</param>
/// <returns></returns>
private bool UnZipFile(string zipFilePath, out string path, string unZipDir = null)
{
if (zipFilePath == string.Empty)
{
path = null;
return false;
}
if (!System.IO.File.Exists(zipFilePath))
{
path = null;
return false;
}
//解压文件夹为空时默认与压缩文件同一级目录下，跟压缩文件同名的文件夹
if (string.IsNullOrWhiteSpace(unZipDir))
unZipDir = zipFilePath.Replace(Path.GetFileName(zipFilePath), Path.GetFileNameWithoutExtension(zipFilePath));
if (!unZipDir.EndsWith("\\"))
unZipDir = "\\";
if (!Directory.Exists(unZipDir))
Directory.CreateDirectory(unZipDir);
try
{
using (ZipInputStream s = new ZipInputStream(System.IO.File.OpenRead(zipFilePath)))
{
ZipEntry theEntry;
while ((theEntry = s.GetNextEntry()) != null)
{
string directoryName = Path.GetDirectoryName(theEntry.Name);
string fileName = Path.GetFileName(theEntry.Name);
if (directoryName.Length > 0)
{
Directory.CreateDirectory(unZipDir directoryName);
}
if (!directoryName.EndsWith("\\"))
directoryName = "\\";
if (fileName != String.Empty)
{
using (FileStream streamWriter = System.IO.File.Create(unZipDir theEntry.Name))
{
int size = 2048;
byte[] data = new byte[2048];
while (true)
{
size = s.Read(data, 0, data.Length);
if (size > 0)
{
streamWriter.Write(data, 0, size);
}
else
{
break;
}
}
}
}
}
}
}
catch
{
path = null;
return false;
}
path = unZipDir;
return true;
}
}
/// <summary>
/// excel 图片信息
/// </summary>
public class o_ExcelImgModel
{
/// <summary>
/// ID
/// </summary>
public string ID { get; set; }
/// <summary>
/// 上传图片生成的id
/// </summary>
public string Name { get; set; }
/// <summary>
/// 图片文件绝对路径
/// </summary>
public string PathOfPicture { get; set; }
}
public class ExcelHelper
{
private static IWorkbook workbook = null;
private static FileStream fs = null;
/// <summary>
/// 将excel中的数据导入到DataTable中
/// </summary>
/// <param name="fileName">excel文件路径</param>
/// <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 static DataTable ExcelToDataTable(string fileName, string sheetName = null, bool isFirstRowColumn = true)
{
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);
if (sheet == null) //如果没有找到指定的sheetName对应的sheet，则尝试获取第一个sheet
{
sheet = workbook.GetSheetAt(0);
}
}
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)
{
ICell cell = firstRow.GetCell(i);
if (cell != null)
{
string cellValue = cell.StringCellValue;
if (cellValue != null)
{
DataColumn column = new DataColumn(cellValue);
data.Columns.Add(column);
}
}
}
startRow = sheet.FirstRowNum 1;
}
else
{
for (int i = firstRow.FirstCellNum; i < cellCount; i )
{
DataColumn column = new DataColumn(i.ToString());
data.Columns.Add(column);
}
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;
}
}
}
}

简单记录一下，有问题的，可以留言，看到就回复

这篇好文章是转载于：学新通技术网

使用net core 6 c# 的 NPOI 包，读取excel..xlsx单元格内的图片，并存储到指定服务器

photoshop保存的图片太大微信发不了怎么办

《学习通》视频自动暂停处理方法

Android 11 保存文件到外部存储，并分享文件

word里面弄一个表格后上面的标题会跑到下面怎么办

photoshop扩展功能面板显示灰色怎么办

微信公众号没有声音提示怎么办

excel下划线不显示怎么办

excel打印预览压线压字怎么办

TikTok加速器哪个好免费的TK加速器推荐

怎样阻止微信小程序自动打开