实现asp.net的文件压缩、解压、下载

我不是女神ヾ 2022-03-31 10:13 332阅读 0赞

很早前就想做文件的**解压、压缩、下载** 了，不过一直没时间，现在项目做完了，今天弄了下。不过解压，压缩的方法还是看的网上的，嘻嘻~~不过我把它们综合了一下哦。呵呵~~

**1.先要从网上下载一个icsharpcode.sharpziplib.dll**

**2.建立类AttachmentUnZip，内容如下：**

using System;  
using System.Data;  
using System.Configuration;  
using System.Web;  
using System.Web.Security;  
using System.Web.UI;  
using System.Web.UI.HtmlControls;  
using System.Web.UI.WebControls;  
using System.Web.UI.WebControls.WebParts;  
using System.IO;  
using ICSharpCode.SharpZipLib.Zip;  
using ICSharpCode.SharpZipLib.GZip;  
using ICSharpCode.SharpZipLib.BZip2;  
using ICSharpCode.SharpZipLib.Checksums;  
using ICSharpCode.SharpZipLib.Zip.Compression;  
using ICSharpCode.SharpZipLib.Zip.Compression.Streams;  
/// <summary>  
///UnZipClass 的摘要说明  
/// </summary>  
public class UnZipClass  
\{  
public UnZipClass()  
\{  
//  
//TODO: 在此处添加构造函数逻辑  
//  
\}  
/// <summary>  
/// 解压文件  
/// </summary>  
/// <param name="args">包含要解压的文件名和要解压到的目录名数组</param>  
public void UnZip(string\[\] args)  
\{  
ZipInputStream s = new ZipInputStream(File.OpenRead(args\[0\]));  
try  
\{  
ZipEntry theEntry;  
while ((theEntry = s.GetNextEntry()) != null)  
\{  
string directoryName = Path.GetDirectoryName(args\[1\]);  
string fileName = Path.GetFileName(theEntry.Name);  
  
//生成解压目录  
Directory.CreateDirectory(directoryName);  
  
if (fileName != String.Empty)  
\{  
//解压文件到指定的目录  
FileStream streamWriter = File.Create(args\[1\] + fileName);  
  
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;  
\}  
\}  
  
streamWriter.Close();  
\}  
\}  
s.Close();  
\}  
catch (Exception eu)  
\{  
throw eu;  
\}  
finally  
\{  
s.Close();  
\}  
  
\}//end UnZip  
  
public static bool UnZipFile(string file, string dir)  
\{  
try  
\{  
if (!Directory.Exists(dir))  
Directory.CreateDirectory(dir);  
string fileFullName = Path.Combine(dir, file);  
ZipInputStream s = new ZipInputStream(File.OpenRead(fileFullName));  
  
ZipEntry theEntry;  
while ((theEntry = s.GetNextEntry()) != null)  
\{  
string directoryName = Path.GetDirectoryName(theEntry.Name);  
string fileName = Path.GetFileName(theEntry.Name);  
  
if (directoryName != String.Empty)  
Directory.CreateDirectory(Path.Combine(dir, directoryName));  
  
if (fileName != String.Empty)  
\{  
FileStream streamWriter = File.Create(Path.Combine(dir, 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;  
\}  
\}  
  
streamWriter.Close();  
\}  
\}  
s.Close();  
return true;  
\}  
catch (Exception)  
\{  
throw;  
\}  
\}  
  
\}  
**4.建立类ZipClass，内容如下：**

using System;  
using System.Data;  
using System.Configuration;  
using System.Web;  
using System.Web.Security;  
using System.Web.UI;  
using System.Web.UI.HtmlControls;  
using System.Web.UI.WebControls;  
using System.Web.UI.WebControls.WebParts;  
using System.IO;  
using ICSharpCode.SharpZipLib.Zip;  
using ICSharpCode.SharpZipLib.GZip;  
using ICSharpCode.SharpZipLib.BZip2;  
using ICSharpCode.SharpZipLib.Checksums;  
using ICSharpCode.SharpZipLib.Zip.Compression;  
using ICSharpCode.SharpZipLib.Zip.Compression.Streams;  
/// <summary>  
///ZipClass 的摘要说明  
/// </summary>  
public class ZipClass  
\{  
public ZipClass()  
\{  
//  
//TODO: 在此处添加构造函数逻辑  
//  
\}  
public void ZipFile(string FileToZip, string ZipedFile, int CompressionLevel, int BlockSize, string password)  
\{  
//如果文件没有找到，则报错  
if (!System.IO.File.Exists(FileToZip))  
\{  
throw new System.IO.FileNotFoundException("The specified file " + FileToZip + " could not be found. Zipping aborderd");  
\}  
  
System.IO.FileStream StreamToZip = new System.IO.FileStream(FileToZip, System.IO.FileMode.Open, System.IO.FileAccess.Read);  
System.IO.FileStream ZipFile = System.IO.File.Create(ZipedFile);  
ZipOutputStream ZipStream = new ZipOutputStream(ZipFile);  
ZipEntry ZipEntry = new ZipEntry("ZippedFile");  
ZipStream.PutNextEntry(ZipEntry);  
ZipStream.SetLevel(CompressionLevel);  
byte\[\] buffer = new byte\[BlockSize\];  
System.Int32 size = StreamToZip.Read(buffer, 0, buffer.Length);  
ZipStream.Write(buffer, 0, size);  
try  
\{  
while (size < StreamToZip.Length)  
\{  
int sizeRead = StreamToZip.Read(buffer, 0, buffer.Length);  
ZipStream.Write(buffer, 0, sizeRead);  
size += sizeRead;  
\}  
\}  
catch (System.Exception ex)  
\{  
throw ex;  
\}  
ZipStream.Finish();  
ZipStream.Close();  
StreamToZip.Close();  
\}  
  
public void ZipFileMain(string\[\] args)  
\{  
//string\[\] filenames = Directory.GetFiles(args\[0\]);  
string\[\] filenames = new string\[\] \{ args\[0\] \};  
  
Crc32 crc = new Crc32();  
ZipOutputStream s = new ZipOutputStream(File.Create(args\[1\]));  
  
s.SetLevel(6); // 0 - store only to 9 - means best compression  
  
foreach (string file in filenames)  
\{  
//打开压缩文件  
FileStream fs = File.OpenRead(file);  
byte\[\] buffer = new byte\[fs.Length\];  
fs.Read(buffer, 0, buffer.Length);  
ZipEntry entry = new ZipEntry(file);  
entry.DateTime = DateTime.Now;  
  
// set Size and the crc, because the information  
// about the size and crc should be stored in the header  
// if it is not set it is automatically written in the footer.  
// (in this case size == crc == -1 in the header)  
// Some ZIP programs have problems with zip files that don't store  
// the size and crc in the header.  
entry.Size = fs.Length;  
fs.Close();  
  
crc.Reset();  
crc.Update(buffer);  
  
entry.Crc = crc.Value;  
  
s.PutNextEntry(entry);  
  
s.Write(buffer, 0, buffer.Length);  
  
\}  
s.Finish();  
s.Close();  
\}  
\}  
**5.类建好了，接下来建立测试页了。呵呵~~EcodeZipRar.aspx,哦，对了，忘了说了，我还在网站外层目录下建了一个文件夹FileZip，用来存放文件的。**

**前台页面显示：**

<%@ Page Language="C\#" AutoEventWireup="true" CodeFile="EcodeZipRar.aspx.cs" Inherits="EcodeZipRar" %>  
  
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">  
  
<html xmlns="http://www.w3.org/1999/xhtml">  
<head runat="server">  
<title>无标题页</title>  
</head>  
<body>  
<form id="form1" runat="server">  
<div>  
添加要压缩的文件：<asp:fileupload ID="Fileupload1" runat="server"></asp:fileupload>  
<br />  
<asp:Button ID="Button1" runat="server" Text="上传文件" οnclick="Button1\_Click" />//对于Fileupload1操作的  
<asp:Button ID="Button2" runat="server" οnclick="Button2\_Click1" Text="开始解压" />//对于Fileupload1操作的  
<asp:Button ID="Button3" runat="server" Text="文件下载" οnclick="Button3\_Click" /><br />//对于TreeView1操作的  
<asp:TreeView ID="TreeView1" runat="server" ShowCheckBoxes="All">//显示文件夹下的所有文件  
</asp:TreeView>  
</div>  
</form>  
</body>  
</html>  
  
**后台代码操作：**

using System;  
using System.Collections;  
using System.Configuration;  
using System.Data;  
using System.Web;  
using System.Web.Security;  
using System.Web.UI;  
using System.Web.UI.HtmlControls;  
using System.Web.UI.WebControls;  
using System.Web.UI.WebControls.WebParts;  
using System.Text;  
using System.IO;  
using ICSharpCode.SharpZipLib.Checksums;  
using ICSharpCode.SharpZipLib.Zip;  
using ICSharpCode.SharpZipLib.GZip;  
using System.Runtime.InteropServices;  
using Microsoft.Win32;  
using System.Diagnostics;  
public partial class EcodeZipRar : System.Web.UI.Page  
\{  
protected void Page\_Load(object sender, EventArgs e)  
\{  
List();  
\}  
//实现文件压缩  
protected void Button1\_Click(object sender, EventArgs e)  
\{  
string\[\] FileProperties = new string\[2\];  
string fullName = Fileupload1.PostedFile.FileName;//C:/test/a.txt  
//待压缩文件  
FileProperties\[0\] = fullName;  
string format = Path.GetExtension(fullName);//文件格式  
string\[\] type = \{ ".zip", ".rar" \};  
bool isZip = true;//指定文件是否需要压缩  
foreach (string types in type)  
\{  
if (format == types)  
\{  
isZip = false;  
break;  
\}  
\}  
string newPath = HttpContext.Current.Server.MapPath("~/FileZip/") + Fileupload1.FileName;  
try  
\{  
Fileupload1.SaveAs(newPath);  
if (isZip)  
\{  
FileProperties\[1\] = HttpContext.Current.Server.MapPath("~/FileZip/") + System.IO.Path.GetFileNameWithoutExtension(fullName) + ".zip";  
//如果文件已经存在，则删除原来的文件  
if(File.Exists(FileProperties\[1\]))  
\{  
File.Delete(FileProperties\[1\]);  
\}  
//压缩后的目标文件  
ZipClass Zc = new ZipClass();  
Zc.ZipFileMain(FileProperties);  
File.Delete(HttpContext.Current.Server.MapPath("~/FileZip/") + Fileupload1.FileName);//删除原始文件  
\}  
List();  
Page.ClientScript.RegisterClientScriptBlock(this.GetType(), "success", "<script>alert('文件上传成功！')</script>");  
\}  
catch  
\{  
Page.ClientScript.RegisterClientScriptBlock(this.GetType(), "success", "<script>alert('文件上传失败！')</script>");  
\}  
  
\}  
//文件解压  
protected void Button2\_Click1(object sender, EventArgs e)  
\{  
string fullName = Fileupload1.PostedFile.FileName; ;//C:/test/a.zip  
string format = Path.GetExtension(fullName);//文件格式  
string\[\] type = \{ ".zip"\};  
bool isUnZip =false;//指定文件是否需要解压  
foreach (string types in type)  
\{  
if (format == types)  
\{  
isUnZip = true;  
break;  
\}  
\}  
if (isUnZip)  
\{  
//解压文件  
AttachmentUnZip.UpZip(fullName);  
string\[\] FileProperties = new string\[2\];  
FileProperties\[0\] = fullName;//待解压的文件  
FileProperties\[1\] = System.IO.Path.GetDirectoryName(fullName);//解压后放置的目标目录  
UnZipClass UnZc = new UnZipClass();  
try  
\{  
UnZc.UnZip(FileProperties);  
List();  
Page.ClientScript.RegisterClientScriptBlock(this.GetType(), "success", "<script>alert('文件解压成功！')</script>");  
\}  
catch  
\{  
Page.ClientScript.RegisterClientScriptBlock(this.GetType(), "success", "<script>alert('文件解压失败！')</script>");  
\}  
\}  
else  
\{  
Page.ClientScript.RegisterClientScriptBlock(this.GetType(), "success", "<script>alert('解压文件格式为zip！')</script>");  
\}  
  
\}  
//获取指定目录下的所有文件  
protected void List()  
\{  
TreeView1.Nodes.Clear();  
string\[\] files = Directory.GetFiles(HttpContext.Current.Server.MapPath("~/FileZip/"));  
foreach (string file in files)  
\{  
TreeNode node = new TreeNode();  
node.Text = file;  
TreeView1.Nodes.Add(node);  
\}  
\}  
//文件下载  
protected void Button3\_Click(object sender, EventArgs e)  
\{  
foreach (TreeNode node in TreeView1.Nodes)  
\{  
if (node.Checked)  
\{  
string path = node.Text;  
string fileName = Path.GetFileName(path);  
DownLoad(fileName, path);  
\}  
\}  
\}  
/\*  
微软为Response对象提供了一个新的方法TransmitFile来解决使用 Response.BinaryWrite下载超过400mb的文件时导致Aspnet\_wp.exe进程回收而无法成功下载的问题。  
代码如下：  
\*/  
/// <summary>  
///  
/// </summary>  
/// <param name="fileName">所下载的文件名</param>  
/// <param name="path">所下载的文件路径</param>  
protected void DownLoad(string fileName, string path)  
\{  
try  
\{  
Response.ContentType = "application/x-zip-compressed";  
Response.AddHeader("Content-Disposition", "attachment;filename=" + fileName + "");  
string file = Server.MapPath(path);  
Response.TransmitFile(file);  
\}  
catch  
\{  
Page.ClientScript.RegisterClientScriptBlock(this.GetType(), "success", "<script>alert('文件下载失败！')</script>");  
\}  
\}  
  
\}  
呵呵，就这样了，暂时没用多线程的，不知道很多人同时下载或上传会不会有影响呢？多线程可以解决问题吗？暂时还没弄，有时间我再看下，然后与大家分享。呵呵~~

不好意思，忘说了，在FireFox浏览器下Fileupload1.PostedFile.FileName获得的只是文件名，因为安全问题完整路径被屏蔽了，在ie下获得的是完整路径，如果发现不是，可以在工具中的Internet选项中设置的。在firefox下就郁闷了，暂时没发现可以设置的。