4. 压缩/解压缩辅助类ZipUtil

/**//// <summary>
/// 压缩/解压缩辅助类
/// </summary>
public sealed class ZipUtil
{
private ZipUtil()
{
}
/**//// <summary>
/// 压缩文件操作
/// </summary>
/// <param name="fileToZip">待压缩文件名</param>
/// <param name="zipedFile">压缩后的文件名</param>
/// <param name="compressionLevel">0~9,表示压缩的程度，9表示最高压缩</param>
/// <param name="blockSize">缓冲块大小</param>
public static void ZipFile(string fileToZip, string zipedFile, int compressionLevel, int blockSize)
{
if (! File.Exists(fileToZip))
{
throw new FileNotFoundException("文件 " + fileToZip + " 没有找到，取消压缩。");
}
using (FileStream streamToZip = new FileStream(fileToZip, FileMode.Open, FileAccess.Read))
{
FileStream fileStream = File.Create(zipedFile);
using (ZipOutputStream zipStream = new ZipOutputStream(fileStream))
{
ZipEntry zipEntry = new ZipEntry(fileToZip);
zipStream.PutNextEntry(zipEntry);
zipStream.SetLevel(compressionLevel);
byte[] buffer = new byte[blockSize];
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 (Exception ex)
{
throw ex;
}
zipStream.Finish();
}
}
}
/**//// <summary>
/// 打开sourceZipPath的压缩文件，解压到destPath目录中
/// </summary>
/// <param name="sourceZipPath">待解压的文件路径</param>
/// <param name="destPath">解压后的文件路径</param>
public static void UnZipFile(string sourceZipPath, string destPath)
{
if (!destPath.EndsWith(Path.DirectorySeparatorChar.ToString()))
{
destPath = destPath + Path.DirectorySeparatorChar;
}
using (ZipInputStream zipInputStream = new ZipInputStream(File.OpenRead(sourceZipPath)))
{
ZipEntry theEntry;
while ((theEntry = zipInputStream.GetNextEntry()) != null)
{
string fileName = destPath + Path.GetDirectoryName(theEntry.Name) +
Path.DirectorySeparatorChar + Path.GetFileName(theEntry.Name);
//create directory for file (if necessary)
Directory.CreateDirectory(Path.GetDirectoryName(fileName));
if (!theEntry.IsDirectory)
{
using (FileStream streamWriter = File.Create(fileName))
{
int size = 2048;
byte[] data = new byte[size];
try
{
while (true)
{
size = zipInputStream.Read(data, 0, data.Length);
if (size > 0)
{
streamWriter.Write(data, 0, size);
}
else
{
break;
}
}
}
catch
{
}
}
}
}
}
}
}
压缩/解压缩辅助类ZipUtil测试代码：
public class TestZipUtil
{
public static string Execute()
{
string result = string.Empty;
result += "使用ZipUtil压缩/解压缩辅助类：" + "\r\n";
try
{
ZipUtil.ZipFile("Web.Config", "Test.Zip", 6, 512);
ZipUtil.UnZipFile("Test.Zip", "Test");
result += "操作完成！\r\n \r\n";
}
catch (Exception ex)
{
result += string.Format("发生错误:{0}！\r\n \r\n", ex.Message);
}
return result;
}
}