C#使用SharpZipLib压缩和解压文件1/3压缩类
using System;
using System.Collections.Generic;
using System.IO;
using ICSharpCode.SharpZipLib.Checksums;
using ICSharpCode.SharpZipLib.Zip;
namespace Compression
{
/// <summary>
/// 压缩文件
/// </summary>
public class ZipClass
{
/// <summary>
/// 所有文件缓存
/// </summary>
List<string> files = new List<string>();
/// <summary>
/// 所有空目录缓存
/// </summary>
List<string> paths = new List<string>();
/// <summary>
/// 压缩单个文件
/// </summary>
/// <param name="fileToZip">要压缩的文件</param>
/// <param name="zipedFile">压缩后的文件全名</param>
/// <param name="compressionLevel">压缩程度，范围0-9，数值越大，压缩程序越高</param>
/// <param name="blockSize">分块大小</param>
public void ZipFile(string fileToZip, string zipedFile, int compressionLevel, int blockSize)
{
if (!System.IO.File.Exists(fileToZip))//如果文件没有找到，则报错
{
throw new FileNotFoundException("The specified file " + fileToZip + " could not be found. Zipping aborderd");
}
FileStream streamToZip = new FileStream(fileToZip, FileMode.Open, FileAccess.Read);
FileStream zipFile = File.Create(zipedFile);
ZipOutputStream zipStream = new ZipOutputStream(zipFile);
ZipEntry zipEntry = new ZipEntry(fileToZip);
zipStream.PutNextEntry(zipEntry);
zipStream.SetLevel(compressionLevel);
byte[] buffer = new byte[blockSize];
int 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 (Exception ex)
{
throw ex;
}
zipStream.Finish();
zipStream.Close();
streamToZip.Close();
}
/// <summary>
/// 压缩目录（包括子目录及所有文件）
/// </summary>
/// <param name="rootPath">要压缩的根目录</param>
/// <param name="destinationPath">保存路径</param>
/// <param name="compressLevel">压缩程度，范围0-9，数值越大，压缩程序越高</param>
public void ZipFileFromDirectory(string rootPath, string destinationPath, int compressLevel)
{
GetAllDirectories(rootPath);
while (rootPath.LastIndexOf("//") + 1 == rootPath.Length)//检查路径是否以"/"结尾
{
rootPath = rootPath.Substring(0,rootPath.Length - 1);//如果是则去掉末尾的"/"
}
string rootMark = rootPath.Substring(0, rootPath.LastIndexOf("//") + 1);//得到当前路径的位置，以备压缩时将所压缩内容转变成相对路径。
Crc32 crc = new Crc32();
ZipOutputStream outPutStream = new ZipOutputStream(File.Create(destinationPath));
outPutStream.SetLevel(compressLevel); // 0 - store only to 9 - means best compression
foreach (string file in files)
{
FileStream fileStream = File.OpenRead(file);//打开压缩文件
byte[] buffer = new byte[fileStream.Length];
fileStream.Read(buffer, 0, buffer.Length);
ZipEntry entry = new ZipEntry(file.Replace(rootMark,string.Empty));
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 = fileStream.Length;
fileStream.Close();
crc.Reset();
crc.Update(buffer);
entry.Crc = crc.Value;
outPutStream.PutNextEntry(entry);
outPutStream.Write(buffer, 0, buffer.Length);
}
this.files.Clear();
foreach (string emptyPath in paths)
{
ZipEntry entry = new ZipEntry(emptyPath.Replace(rootMark, string.Empty) + "/");
outPutStream.PutNextEntry(entry);
}
this.paths.Clear();
outPutStream.Finish();
outPutStream.Close();
}
/// <summary>
/// 取得目录下所有文件及文件夹，分别存入files及paths
/// </summary>
/// <param name="rootPath">根目录</param>
private void GetAllDirectories(string rootPath)
{
string[] subPaths = Directory.GetDirectories(rootPath);//得到所有子目录
foreach (string path in subPaths)
{
GetAllDirectories(path);//对每一个字目录做与根目录相同的操作：即找到子目录并将当前目录的文件名存入List
}
string[] files = Directory.GetFiles(rootPath);
foreach (string file in files)
{
this.files.Add(file);//将当前目录中的所有文件全名存入文件List
}
if (subPaths.Length == files.Length && files.Length == 0)//如果是空目录
{
this.paths.Add(rootPath);//记录空目录
}
}
}
}