C#实现文件的压缩与解压

2019独角兽企业重金招聘Python工程师标准>>>

一、准备工作

1、下载 ICSharpCode.SharpZipLib.dll 文件

2、项目中引用这个dll

二、文件压缩与解压共用类

using System; using System.Collections; using System.Collections.Generic; using System.IO; using ICSharpCode.SharpZipLib.Checksums; using ICSharpCode.SharpZipLib.Zip;namespace ZIPUtilities {/**

/// Zip压缩帮助类///

public class ZipHelper{/** /// 压缩文件夹/// 
/// /// /// 压缩率0&＃xff08;无压缩&＃xff09;9&＃xff08;压缩率最高&＃xff09;public void ZipDir(string dirToZip, string zipedFileName, int compressionLevel &＃61; 9){if (Path.GetExtension(zipedFileName) !&＃61; ".zip"){zipedFileName &＃61; zipedFileName &＃43; ".zip";}using (var zipoutputstream &＃61; new ZipOutputStream(File.Create(zipedFileName))){zipoutputstream.SetLevel(compressionLevel);Crc32 crc &＃61; new Crc32();Hashtable fileList &＃61; GetAllFies(dirToZip);foreach (DictionaryEntry item in fileList){FileStream fs &＃61; new FileStream(item.Key.ToString(), FileMode.Open, FileAccess.Read, FileShare.ReadWrite);byte[] buffer &＃61; new byte[fs.Length];fs.Read(buffer, 0, buffer.Length);// ZipEntry entry &＃61; new ZipEntry(item.Key.ToString().Substring(dirToZip.Length &＃43; 1));ZipEntry entry &＃61; new ZipEntry(Path.GetFileName(item.Key.ToString())){DateTime &＃61; (DateTime) item.Value,Size &＃61; fs.Length};fs.Close();crc.Reset();crc.Update(buffer);entry.Crc &＃61; crc.Value;zipoutputstream.PutNextEntry(entry);zipoutputstream.Write(buffer, 0, buffer.Length);}}}/**   /// 获取所有文件  /// 
  ///   public Hashtable GetAllFies(string dir){Hashtable filesList &＃61; new Hashtable();DirectoryInfo fileDire &＃61; new DirectoryInfo(dir);if (!fileDire.Exists){throw new FileNotFoundException("目录:" &＃43; fileDire.FullName &＃43; "没有找到!");}GetAllDirFiles(fileDire, filesList);GetAllDirsFiles(fileDire.GetDirectories(), filesList);return filesList;}/**   /// 获取一个文件夹下的所有文件夹里的文件  /// 
  ///   ///   public void GetAllDirsFiles(IEnumerable dirs, Hashtable filesList){foreach (DirectoryInfo dir in dirs){foreach (FileInfo file in dir.GetFiles("*.*")){filesList.Add(file.FullName, file.LastWriteTime);}GetAllDirsFiles(dir.GetDirectories(), filesList);}}/**   /// 获取一个文件夹下的文件  /// 
  /// 目录名称/// 文件列表HastTable  public static void GetAllDirFiles(DirectoryInfo dir, Hashtable filesList){foreach (FileInfo file in dir.GetFiles("*.*")){filesList.Add(file.FullName, file.LastWriteTime);}}/**   /// 功能&＃xff1a;解压zip格式的文件。  /// 
  /// 压缩文件路径  /// 解压文件存放路径,为空时默认与压缩文件同一级目录下&＃xff0c;跟压缩文件同名的文件夹  /// 解压是否成功  public void UnZip(string zipFilePath, string unZipDir){if (zipFilePath &＃61;&＃61; string.Empty){throw new Exception("压缩文件不能为空&＃xff01;");}if (!File.Exists(zipFilePath)){throw new FileNotFoundException("压缩文件不存在&＃xff01;");}//解压文件夹为空时默认与压缩文件同一级目录下&＃xff0c;跟压缩文件同名的文件夹  if (unZipDir &＃61;&＃61; string.Empty)unZipDir &＃61; zipFilePath.Replace(Path.GetFileName(zipFilePath), Path.GetFileNameWithoutExtension(zipFilePath));if (!unZipDir.EndsWith("/"))unZipDir &＃43;&＃61; "/";if (!Directory.Exists(unZipDir))Directory.CreateDirectory(unZipDir);using (var s &＃61; new ZipInputStream(File.OpenRead(zipFilePath))){ZipEntry theEntry;while ((theEntry &＃61; s.GetNextEntry()) !&＃61; null){string directoryName &＃61; Path.GetDirectoryName(theEntry.Name);string fileName &＃61; Path.GetFileName(theEntry.Name);if (!string.IsNullOrEmpty(directoryName)){Directory.CreateDirectory(unZipDir &＃43; directoryName);}if (directoryName !&＃61; null && !directoryName.EndsWith("/")){}if (fileName !&＃61; String.Empty){using (FileStream streamWriter &＃61; File.Create(unZipDir &＃43; theEntry.Name)){int size;byte[] data &＃61; new byte[2048];while (true){size &＃61; s.Read(data, 0, data.Length);if (size > 0){streamWriter.Write(data, 0, size);}else{break;}}}}}}}/** /// 压缩单个文件/// 
/// 被压缩的文件名称(包含文件路径)&＃xff0c;文件的全路径/// 压缩后的文件名称(包含文件路径)&＃xff0c;保存的文件名称/// 压缩率0&＃xff08;无压缩&＃xff09;到 9&＃xff08;压缩率最高&＃xff09;public void ZipFile(string filePath, string zipedFileName, int compressionLevel &＃61; 9){// 如果文件没有找到&＃xff0c;则报错 if (!File.Exists(filePath)){throw new FileNotFoundException("文件&＃xff1a;" &＃43; filePath &＃43; "没有找到&＃xff01;");}// 如果压缩后名字为空就默认使用源文件名称作为压缩文件名称if (string.IsNullOrEmpty(zipedFileName)){string oldValue &＃61; Path.GetFileName(filePath);if (oldValue !&＃61; null){zipedFileName &＃61; filePath.Replace(oldValue, "") &＃43; Path.GetFileNameWithoutExtension(filePath) &＃43; ".zip";}}// 如果压缩后的文件名称后缀名不是zip&＃xff0c;就是加上zip&＃xff0c;防止是一个乱码文件if (Path.GetExtension(zipedFileName) !&＃61; ".zip"){zipedFileName &＃61; zipedFileName &＃43; ".zip";}// 如果指定位置目录不存在&＃xff0c;创建该目录  C:\\Users\\yhl\\Desktop\\大汉三通string zipedDir &＃61; zipedFileName.Substring(0, zipedFileName.LastIndexOf("\\\\", StringComparison.Ordinal));if (!Directory.Exists(zipedDir)){Directory.CreateDirectory(zipedDir);}// 被压缩文件名称string filename &＃61; filePath.Substring(filePath.LastIndexOf("\\\\", StringComparison.Ordinal) &＃43; 1);var streamToZip &＃61; new FileStream(filePath, FileMode.Open, FileAccess.Read);var zipFile &＃61; File.Create(zipedFileName);var zipStream &＃61; new ZipOutputStream(zipFile);var zipEntry &＃61; new ZipEntry(filename);zipStream.PutNextEntry(zipEntry);zipStream.SetLevel(compressionLevel);var buffer &＃61; new byte[2048];Int32 size &＃61; streamToZip.Read(buffer, 0, buffer.Length);zipStream.Write(buffer, 0, size);try{while (size  /// 压缩单个文件 ///  /// 要进行压缩的文件名&＃xff0c;全路径 /// 压缩后生成的压缩文件名,全路径 public void ZipFile(string fileToZip, string zipedFile){// 如果文件没有找到&＃xff0c;则报错 if (!File.Exists(fileToZip)){throw new FileNotFoundException("指定要压缩的文件: " &＃43; fileToZip &＃43; " 不存在!");}using (FileStream fileStream &＃61; File.OpenRead(fileToZip)){byte[] buffer &＃61; new byte[fileStream.Length];fileStream.Read(buffer, 0, buffer.Length);fileStream.Close();using (FileStream zipFile &＃61; File.Create(zipedFile)){using (ZipOutputStream zipOutputStream &＃61; new ZipOutputStream(zipFile)){// string fileName &＃61; fileToZip.Substring(fileToZip.LastIndexOf("\\\\") &＃43; 1);string fileName &＃61; Path.GetFileName(fileToZip);var zipEntry &＃61; new ZipEntry(fileName){DateTime &＃61; DateTime.Now,IsUnicodeText &＃61; true};zipOutputStream.PutNextEntry(zipEntry);zipOutputStream.SetLevel(5);zipOutputStream.Write(buffer, 0, buffer.Length);zipOutputStream.Finish();zipOutputStream.Close();}}}}/** /// 压缩多个目录或文件/// 
/// 待压缩的文件夹或者文件&＃xff0c;全路径格式,是一个集合/// 压缩后的文件名&＃xff0c;全路径格式/// 压缩密码/// public bool ZipManyFilesOrDictorys(IEnumerable folderOrFileList, string zipedFile, string password){bool res &＃61; true;using (var s &＃61; new ZipOutputStream(File.Create(zipedFile))){s.SetLevel(6);if (!string.IsNullOrEmpty(password)){s.Password &＃61; password;}foreach (string fileOrDir in folderOrFileList){//是文件夹if (Directory.Exists(fileOrDir)){res &＃61; ZipFileDictory(fileOrDir, s, "");}else{//文件res &＃61; ZipFileWithStream(fileOrDir, s);}}s.Finish();s.Close();return res;}}/** /// 带压缩流压缩单个文件/// 
/// 要进行压缩的文件名/// /// private bool ZipFileWithStream(string fileToZip, ZipOutputStream zipStream){//如果文件没有找到&＃xff0c;则报错if (!File.Exists(fileToZip)){throw new FileNotFoundException("指定要压缩的文件: " &＃43; fileToZip &＃43; " 不存在!");}//FileStream fs &＃61; null;FileStream zipFile &＃61; null;ZipEntry zipEntry &＃61; null;bool res &＃61; true;try{zipFile &＃61; File.OpenRead(fileToZip);byte[] buffer &＃61; new byte[zipFile.Length];zipFile.Read(buffer, 0, buffer.Length);zipFile.Close();zipEntry &＃61; new ZipEntry(Path.GetFileName(fileToZip));zipStream.PutNextEntry(zipEntry);zipStream.Write(buffer, 0, buffer.Length);}catch{res &＃61; false;}finally{if (zipEntry !&＃61; null){}if (zipFile !&＃61; null){zipFile.Close();}GC.Collect();GC.Collect(1);}return res;}/** /// 递归压缩文件夹方法/// 
/// /// /// private bool ZipFileDictory(string folderToZip, ZipOutputStream s, string parentFolderName){bool res &＃61; true;ZipEntry entry &＃61; null;FileStream fs &＃61; null;Crc32 crc &＃61; new Crc32();try{//创建当前文件夹entry &＃61; new ZipEntry(Path.Combine(parentFolderName, Path.GetFileName(folderToZip) &＃43; "/")); //加上 “/” 才会当成是文件夹创建s.PutNextEntry(entry);s.Flush();//先压缩文件&＃xff0c;再递归压缩文件夹var filenames &＃61; Directory.GetFiles(folderToZip);foreach (string file in filenames){//打开压缩文件fs &＃61; File.OpenRead(file);byte[] buffer &＃61; new byte[fs.Length];fs.Read(buffer, 0, buffer.Length);entry &＃61; new ZipEntry(Path.Combine(parentFolderName, Path.GetFileName(folderToZip) &＃43; "/" &＃43; Path.GetFileName(file)));entry.DateTime &＃61; DateTime.Now;entry.Size &＃61; fs.Length;fs.Close();crc.Reset();crc.Update(buffer);entry.Crc &＃61; crc.Value;s.PutNextEntry(entry);s.Write(buffer, 0, buffer.Length);}}catch{res &＃61; false;}finally{if (fs !&＃61; null){fs.Close();}if (entry !&＃61; null){}GC.Collect();GC.Collect(1);}var folders &＃61; Directory.GetDirectories(folderToZip);foreach (string folder in folders){if (!ZipFileDictory(folder, s, Path.Combine(parentFolderName, Path.GetFileName(folderToZip)))){return false;}}return res;}}
}