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实现asp.net的文件压缩、解压、下载

关键词:解压文件压缩下载asp.net  阅读(623) 赞(20)

[摘要]本文是对实现asp.net的文件压缩、解压、下载的讲解,对学习ASP.NET编程技术有所帮助,与大家分享。

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 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;
using System.IO;
/// <summary>
///AttachmentUnZip 的摘要说明
/// </summary>
public class AttachmentUnZip
{
public AttachmentUnZip()
{
//
//TODO: 在此处添加构造函数逻辑
//
}
public static void UpZip(string zipFile)
{
string[] FileProperties = new string[2];
FileProperties[0] = zipFile;//待解压的文件
FileProperties[1] = zipFile.Substring(0, zipFile.LastIndexOf("//") + 1);//解压后放置的目标目录
UnZipClass UnZc = new UnZipClass();
UnZc.UnZip(FileProperties);
}
}
3.建立类UnZipClass,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" onclick="Button1_Click" />//对于Fileupload1操作的
<asp:Button ID="Button2" runat="server" onclick="Button2_Click1" Text="开始解压" />//对于Fileupload1操作的
<asp:Button ID="Button3" runat="server" Text="文件下载" onclick="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。



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