批量下载文件（下载压缩包）

àì夳堔傛蜴生んèń 2023-03-12 09:10 167阅读 0赞

> 首先引入ICSharpCode.SharpZipLib插件，下图中的两个都可以，只是版本不同（如果你有安装过npoi，可能里面默认会有第二个版本的插件，直接引用就好了），下面话不多说，上代码

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L1N1bnNoaW5lQmxvZw_size_16_color_FFFFFF_t_70][]

using ICSharpCode.SharpZipLib.Zip;
    using System;
    using System.Collections.Generic;
    using System.IO;
    using System.Linq;
    using System.Net;
    using System.Net.Http;
    using System.Text;
    using System.Web.Http;
    using System.Web.Mvc;
    
    namespace WebApplication2.Controllers
    {
        public class ZipController : Controller
        {
            public void DownZip()
            {
              byte[] fileBytes=  DownAllProductClause(new List<FileHelpInfo>());
                Response.ContentType = "application/octet-stream";
                Response.AppendHeader("Content-Disposition", "attachment;filename=" + "附件" + ".rar");
                Response.AddHeader("Content-Length", fileBytes.Length.ToString());
                Response.BinaryWrite(fileBytes);
                Response.End();
                Response.Close();
            }
    
            public byte[] DownAllProductClause(List<FileHelpInfo> urlArray)
            {
                //安全协议设置 一般情况下如果不是访问https则不需要设置
                ServicePointManager.SecurityProtocol = (SecurityProtocolType)3072 | SecurityProtocolType.Ssl3 | SecurityProtocolType.Tls;
    
                System.Net.WebClient myWebClient = new System.Net.WebClient();
    
                Dictionary<string, Stream> dc = new Dictionary<string, Stream>();
    
                foreach (var item in urlArray)
                {
                    byte[] data = myWebClient.DownloadData(item.FilePath);
                    Stream stream = new MemoryStream(data);
                    dc.Add(item.FileName, stream);
                }
                byte[] fileBytes = ConvertZipStream(dc);
    
                return fileBytes;
            }
    
    
            public byte[] ConvertZipStream(Dictionary<string, Stream> streams)
            {
                MemoryStream returnStream = new MemoryStream();
                var zipMs = new MemoryStream();
                /*
                 * 解决中文乱码问题
                 * 
                 *  ICSharpCode.SharpZipLib 0.86版本使用ZipConstants.DefaultCodePage
                 *  ZipConstants.DefaultCodePage = Encoding.GetEncoding("gbk").CodePage;
                 *  
                 *  ICSharpCode.SharpZipLib 较新的版本使用ZipStrings.CodePage  
                 *  ZipStrings.CodePage = Encoding.GetEncoding("gbk").CodePage;
                 *  
                 * */
    
                ZipConstants.DefaultCodePage = Encoding.GetEncoding("gbk").CodePage;
                using (ZipOutputStream zipStream = new ZipOutputStream(zipMs))
                {
                    zipStream.SetLevel(6);
                    foreach (var kv in streams)
                    {
                        string fileName = kv.Key;
                        using (var streamInput = kv.Value)
                        {
                            byte[] buffer = new byte[streamInput.Length];
    
                            zipStream.PutNextEntry(new ZipEntry(fileName));
    
                            var readCount = streamInput.Read(buffer, 0, buffer.Length);
    
                            if (readCount > 0)
                            {
                                zipStream.Write(buffer, 0, readCount);
                            }
                            zipStream.Flush();
                        }
                        kv.Value.Close();
                    }
                    zipStream.Finish();
                    zipMs.Position = 0;
                    zipMs.CopyTo(returnStream, (int)zipMs.Length);
                }
                returnStream.Position = 0;
    
                byte[] returnBytes = new byte[returnStream.Length];
                returnStream.Read(returnBytes, 0, returnBytes.Length);
                returnStream.Seek(0, SeekOrigin.Begin);
    
                return returnBytes;
            }
    
        }
        public class FileHelpInfo
        {
            public string FilePath { get; set; }
            public string FileName { get; set; }
        }
    }

[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L1N1bnNoaW5lQmxvZw_size_16_color_FFFFFF_t_70]: /images/20230312/e8407cda95214360a6fa67fec3ec7a8e.png