asp.net C#实现解压缩文件的方法
本文实例讲述了asp.net C#实现解压缩文件的方法。一共给大家介绍了三段代码，一个是简单的解压缩单个zip文件，后一个可以解压批量的大量的但需要调用ICSharpCode.SharpZipLib.dll类了，最后一个比较实例可压缩也可以解压缩了分享给大家供大家参考。具体如下：
解压缩单个文件：
using System.IO;
using System.IO.Compression;
string sourceFile=@"D:2.zip";
string destinationFile=@"D:1.txt";
private const long BUFFER_SIZE = 20480;
// make sure the source file is there
if (File.Exists ( sourceFile ))
{
FileStream sourceStream = null;
FileStream destinationStream = null;
GZipStream decompressedStream = null;
byte[] quartetBuffer = null;
try
{
// Read in the compressed source stream
sourceStream = new FileStream ( sourceFile, FileMode.Open );
// Create a compression stream pointing to the destiantion stream
decompressedStream = new DeflateStream ( sourceStream, CompressionMode.Decompress, true );
// Read the footer to determine the length of the destiantion file
quartetBuffer = new byte[4];
int position = (int)sourceStream.Length - 4;
sourceStream.Position = position;
sourceStream.Read ( quartetBuffer, 0, 4 );
sourceStream.Position = 0;
int checkLength = BitConverter.ToInt32 ( quartetBuffer, 0 );
byte[] buffer = new byte[checkLength + 100];
int offset = 0;
int total = 0;
// Read the compressed data into the buffer
while ( true )
{
int bytesRead = decompressedStream.Read ( buffer, offset, 100 );
if ( bytesRead == 0 )
break;
offset += bytesRead;
total += bytesRead;
}
// Now write everything to the destination file
destinationStream = new FileStream ( destinationFile, FileMode.Create );
destinationStream.Write ( buffer, 0, total );
// and flush everyhting to clean out the buffer
destinationStream.Flush ( );
}
catch ( ApplicationException ex )
{
Console.WriteLine(ex.Message, "解压文件时发生错误：");
}
finally
{
// Make sure we allways close all streams
if ( sourceStream != null )
sourceStream.Close ( );
if ( decompressedStream != null )
decompressedStream.Close ( );
if ( destinationStream != null )
destinationStream.Close ( );
}
}
批量解压缩(这需要调用一个解压缩类库。。 ICSharpCode.SharpZipLib.dll)
using System;
using System.IO;
using System.Collections.Generic;
using System.Text;
using ICSharpCode.SharpZipLib.Zip;
namespace ZipLib
{
/// <summary>
/// 解压缩类
/// </summary>
public static class ZIP
{
/// <summary>
/// 解压ZIP文件包
/// </summary>
/// <param name="strZipFile">ZIP文件路径</param>
/// <param name="strDir">解压后的文件目录路径</param>
/// <returns>是否解压成功</returns>
public static bool unzipFiles(string strZipFile, string strDir)
{
//判断ZIP文件是否存在
if (File.Exists(strZipFile))
{
//判断目录是否存在
bool bUnzipDir = false;
//判断是否需要创建目录
if (!Directory.Exists(strDir))
bUnzipDir = (Directory.CreateDirectory(strDir) != null);
else
bUnzipDir = true;
//如果解压目录存在
if (bUnzipDir)
{
//获得ZIP数据流
ZipInputStream zipStream = new ZipInputStream(File.OpenRead(strZipFile));
if (zipStream != null)
{
ZipEntry zipEntry = null;
while ((zipEntry = zipStream.GetNextEntry()) != null)
{
string strUnzipFile = strDir + "//" + zipEntry.Name;
string strFileName = Path.GetFileName(strUnzipFile);
string strDirName = Path.GetDirectoryName(strUnzipFile);
//是否为解压目录
if (!string.IsNullOrEmpty(strDirName))
Directory.CreateDirectory(strDirName);
//是否为解压文件
if (!string.IsNullOrEmpty(strFileName))
{
//解压文件
FileStream unzipFileStream = new FileStream(strUnzipFile, FileMode.Create);
if (unzipFileStream != null)
{
byte[] buf = new byte[2048];
int size = 0;
while ((size = zipStream.Read(buf, 0, 2048)) > 0)
unzipFileStream.Write(buf, 0, size);
//关闭Stream
unzipFileStream.Flush();
unzipFileStream.Close();
}
}
}
//关闭ZIP流
zipStream.Close();
//返回值
return true;
}
}
}
return false;
}
}
}
上面两个都是解压缩文件，下面我们把压缩与解压缩放在一个实例中。
最近要做一个项目涉及到C#中压缩与解压缩的问题的解决方法，大家分享。
这里主要解决文件夹包含文件夹的解压缩问题。
下载SharpZipLib.dll，在http://www.icsharpcode.net/OpenSource/SharpZipLib/Download.aspx中有最新免费版本，“Assemblies for .NET 1.1, .NET 2.0, .NET CF 1.0, .NET CF 2.0: Download [297 KB] ”点击Download可以下载，解压后里边有好多文件夹，因为不同的版本，我用的FW2.0。
或者点击此处本站下载。
引用SharpZipLib.dll，在项目中点击项目右键-->添加引用-->浏览，找到要添加的DLL-->确认
改写了文件压缩和解压缩的两个类，新建两个类名字为ZipFloClass.cs,UnZipFloClass.cs
源码如下
using System;
using System.Data;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.IO;
using ICSharpCode.SharpZipLib.Checksums;
using ICSharpCode.SharpZipLib.Zip;
using ICSharpCode.SharpZipLib.GZip;
/// <summary>
/// ZipFloClass 的摘要说明
/// </summary>
public class ZipFloClass
{
public void ZipFile(string strFile, string strZip)
{
if (strFile[strFile.Length - 1] != Path.DirectorySeparatorChar)
strFile += Path.DirectorySeparatorChar;
ZipOutputStream s = new ZipOutputStream(File.Create(strZip));
s.SetLevel(6); // 0 - store only to 9 - means best compression
zip(strFile, s, strFile);
s.Finish();
s.Close();
}
private void zip(string strFile, ZipOutputStream s, string staticFile)
{
if (strFile[strFile.Length - 1] != Path.DirectorySeparatorChar) strFile += Path.DirectorySeparatorChar;
Crc32 crc = new Crc32();
string[] filenames = Directory.GetFileSystemEntries(strFile);
foreach (string file in filenames)
{
if (Directory.Exists(file))
{
zip(file, s, staticFile);
}
else // 否则直接压缩文件
{
//打开压缩文件
FileStream fs = File.OpenRead(file);
byte[] buffer = new byte[fs.Length];
fs.Read(buffer, 0, buffer.Length);
string tempfile = file.Substring(staticFile.LastIndexOf("\") + 1);
ZipEntry entry = new ZipEntry(tempfile);
entry.DateTime = DateTime.Now;
entry.Size = fs.Length;
fs.Close();
crc.Reset();
crc.Update(buffer);
entry.Crc = crc.Value;
s.PutNextEntry(entry);
s.Write(buffer, 0, buffer.Length);
}
}
}
}
using System;
using System.Data;
using System.Web;
using System.Text;
using System.Collections;
using System.IO;
using System.Diagnostics;
using System.Runtime.Serialization.Formatters.Binary;
using ICSharpCode.SharpZipLib.BZip2;
using ICSharpCode.SharpZipLib.Zip;
using ICSharpCode.SharpZipLib.Zip.Compression;
using ICSharpCode.SharpZipLib.Zip.Compression.Streams;
using ICSharpCode.SharpZipLib.GZip;
using ICSharpCode.SharpZipLib.Checksums;
/// <summary>
/// UnZipFloClass 的摘要说明
/// </summary>
public class UnZipFloClass
{
public string unZipFile(string TargetFile, string fileDir)
{
string rootFile = " ";
try
{
//读取压缩文件(zip文件)，准备解压缩
ZipInputStream s = new ZipInputStream(File.OpenRead(TargetFile.Trim()));
ZipEntry theEntry;
string path = fileDir;
//解压出来的文件保存的路径
string rootDir = " ";
//根目录下的第一个子文件夹的名称
while ((theEntry = s.GetNextEntry()) != null)
{
rootDir = Path.GetDirectoryName(theEntry.Name);
//得到根目录下的第一级子文件夹的名称
if (rootDir.IndexOf("\") >= 0)
{
rootDir = rootDir.Substring(0, rootDir.IndexOf("\") + 1);
}
string dir = Path.GetDirectoryName(theEntry.Name);
//根目录下的第一级子文件夹的下的文件夹的名称
string fileName = Path.GetFileName(theEntry.Name);
//根目录下的文件名称
if (dir != " " )
//创建根目录下的子文件夹,不限制级别
{
if (!Directory.Exists(fileDir + "\" + dir))
{
path = fileDir + "\" + dir;
//在指定的路径创建文件夹
Directory.CreateDirectory(path);
}
}
else if (dir == " " && fileName != "")
//根目录下的文件
{
path = fileDir;
rootFile = fileName;
}
else if (dir != " " && fileName != "")
//根目录下的第一级子文件夹下的文件
{
if (dir.IndexOf("\") > 0)
//指定文件保存的路径
{
path = fileDir + "\" + dir;
}
}
if (dir == rootDir)
//判断是不是需要保存在根目录下的文件
{
path = fileDir + "\" + rootDir;
}
//以下为解压缩zip文件的基本步骤
//基本思路就是遍历压缩文件里的所有文件，创建一个相同的文件。
if (fileName != String.Empty)
{
FileStream streamWriter = File.Create(path + "\" + 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();
return rootFile;
}
catch (Exception ex)
{
return "1; " + ex.Message;
}
}
}
引用，新建一个页面，添加两个按钮，为按钮添加Click事件
源码如下
protected void Button1_Click(object sender, EventArgs e)
{
string[] FileProperties = new string[2];
FileProperties[0] = "D:\unzipped\";//待压缩文件目录
FileProperties[1] = "D:\zip\a.zip"; //压缩后的目标文件
ZipFloClass Zc = new ZipFloClass();
Zc.ZipFile(FileProperties[0], FileProperties[1]);
}
protected void Button2_Click(object sender, EventArgs e)
{
string[] FileProperties = new string[2];
FileProperties[0] = "D:\zip\b.zip";//待解压的文件
FileProperties[1] = "D:\unzipped\";//解压后放置的目标目录
UnZipFloClass UnZc = new UnZipFloClass();
UnZc.unZipFile(FileProperties[0], FileProperties[1]);
}
希望本文所述对大家的asp.net程序设计有所帮助。