本文實例講述了asp.net C#實現解壓縮文件的方法。一共給大家介紹了三段代碼，一個是簡單的解壓縮單個zip文件，后一個可以解壓批量的大量的但需要調用ICSharpCode.SharpZipLib.dll類了，最后一個比較實例可壓縮也可以解壓縮了分享給大家供大家參考。具體如下：
解壓縮單個文件：
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, "解壓文件時發生錯誤：");
}
finally
{
// Make sure we allways close all streams
if ( sourceStream != null )
sourceStream.Close ( );
if ( decompressedStream != null )
decompressedStream.Close ( );
if ( destinationStream != null )
destinationStream.Close ( );
}
}
批量解壓縮(這需要調用一個解壓縮類庫。。 ICSharpCode.SharpZipLib.dll)
using System.IO;
using System.Collections.Generic;
using System.Text;
using ICSharpCode.SharpZipLib.Zip;
namespace ZipLib
{
/// <summary>
/// 解壓縮類
/// </summary>
public static class ZIP
{
/// <summary>
/// 解壓ZIP文件包
/// </summary>
/// <param name="strZipFile">ZIP文件路徑</param>
/// <param name="strDir">解壓后的文件目錄路徑</param>
/// <returns>是否解壓成功</returns>
public static bool unzipFiles(string strZipFile, string strDir)
{
//判斷ZIP文件是否存在
if (File.Exists(strZipFile))
{
//判斷目錄是否存在
bool bUnzipDir = false;
//判斷是否需要創建目錄
if (!Directory.Exists(strDir))
bUnzipDir = (Directory.CreateDirectory(strDir) != null);
else
bUnzipDir = true;
//如果解壓目錄存在
if (bUnzipDir)
{
//獲得ZIP數據流
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);
//是否為解壓目錄
if (!string.IsNullOrEmpty(strDirName))
Directory.CreateDirectory(strDirName);
//是否為解壓文件
if (!string.IsNullOrEmpty(strFileName))
{
//解壓文件
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);
//關閉Stream
unzipFileStream.Flush();
unzipFileStream.Close();
}
}
}
//關閉ZIP流
zipStream.Close();
//返回值
return true;
}
}
}
return false;
}
}
}
上面兩個都是解壓縮文件，下面我們把壓縮與解壓縮放在一個實例中。
最近要做一個項目涉及到C#中壓縮與解壓縮的問題的解決方法，大家分享。
這里主要解決文件夾包含文件夾的解壓縮問題。
下載SharpZipLib.dll，在http://www.icsharpcode.net/OpenSource/SharpZipLib/Download.aspx中有最新免費版本，“Assemblies for .NET 1.1, .NET 2.0, .NET CF 1.0, .NET CF 2.0: Download [297 KB] ”點擊Download可以下載，解壓后里邊有好多文件夾，因為不同的版本，我用的FW2.0。
引用SharpZipLib.dll，在項目中點擊項目右鍵-->添加引用-->瀏覽，找到要添加的DLL-->確認
改寫了文件壓縮和解壓縮的兩個類，新建兩個類名字為ZipFloClass.cs,UnZipFloClass.cs
源碼如下
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 的摘要說明
/// </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 // 否則直接壓縮文件
{
//打開壓縮文件
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.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 的摘要說明
/// </summary>
public class UnZipFloClass
{
public string unZipFile(string TargetFile, string fileDir)
{
string rootFile = " ";
try
{
//讀取壓縮文件(zip文件)，準備解壓縮
ZipInputStream s = new ZipInputStream(File.OpenRead(TargetFile.Trim()));
ZipEntry theEntry;
string path = fileDir;
//解壓出來的文件保存的路徑
string rootDir = " ";
//根目錄下的第一個子文件夾的名稱
while ((theEntry = s.GetNextEntry()) != null)
{
rootDir = Path.GetDirectoryName(theEntry.Name);
//得到根目錄下的第一級子文件夾的名稱
if (rootDir.IndexOf("/") >= 0)
{
rootDir = rootDir.Substring(0, rootDir.IndexOf("/") + 1);
}
string dir = Path.GetDirectoryName(theEntry.Name);
//根目錄下的第一級子文件夾的下的文件夾的名稱
string fileName = Path.GetFileName(theEntry.Name);
//根目錄下的文件名稱
if (dir != " " )
//創建根目錄下的子文件夾,不限制級別
{
if (!Directory.Exists(fileDir + "/" + dir))
{
path = fileDir + "/" + dir;
//在指定的路徑創建文件夾
Directory.CreateDirectory(path);
}
}
else if (dir == " " && fileName != "")
//根目錄下的文件
{
path = fileDir;
rootFile = fileName;
}
else if (dir != " " && fileName != "")
//根目錄下的第一級子文件夾下的文件
{
if (dir.IndexOf("/") > 0)
//指定文件保存的路徑
{
path = fileDir + "/" + dir;
}
}
if (dir == rootDir)
//判斷是不是需要保存在根目錄下的文件
{
path = fileDir + "/" + rootDir;
}
//以下為解壓縮zip文件的基本步驟
//基本思路就是遍歷壓縮文件里的所有文件，創建一個相同的文件。
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，新建一個頁面，添加兩個按鈕，為按鈕添加Click事件
源碼如下
{
string[] FileProperties = new string[2];
FileProperties[0] = "D:/unzipped/";//待壓縮文件目錄
FileProperties[1] = "D:/zip/a.zip"; //壓縮后的目標文件
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";//待解壓的文件
FileProperties[1] = "D:/unzipped/";//解壓后放置的目標目錄
UnZipFloClass UnZc = new UnZipFloClass();
UnZc.unZipFile(FileProperties[0], FileProperties[1]);
}
希望本文所述對大家的asp.net程序設計有所幫助。
