.Net 下利用ICSharpCode.SharpZipLib.dll实现文件压缩、解压缩

添加引用ICSharpCode.SharpZipLib.dll

 

2. using System;   
3. using System.Collections.Generic;   
4. using System.IO;   
5. using System.Threading;   
6. using ICSharpCode.SharpZipLib.Zip;   
7.   
8. namespace Lib   
9. {   
10.     /// <summary>   
11.     /// 文件压缩、解压缩   
12.     /// </summary>   
13.     public class FileCompression   
14.     {   
15.         /// <summary>   
16.         /// 构造函数   
17.         /// </summary>   
18.         public FileCompression()   
19.         {   
20.         }  
21.         #region 加密、压缩文件   
22.         /// <summary>   
23.         /// 压缩文件   
24.         /// </summary>   
25.         /// <param name="fileNames">要打包的文件列表</param>   
26.         /// <param name="GzipFileName">目标文件名</param>   
27.         /// <param name="CompressionLevel">压缩品质级别（0~9）</param>   
28.         /// <param name="SleepTimer">休眠时间（单位毫秒）</param>        
29.         public static void Compress(List<FileInfo> fileNames, string GzipFileName, int CompressionLevel, int SleepTimer)   
30.         {   
31.             ZipOutputStream s = new ZipOutputStream(File.Create(GzipFileName));   
32.             try  
33.             {   
34.                 s.SetLevel(CompressionLevel);   //0 - store only to 9 - means best compression   
35.                 foreach (FileInfo file in fileNames)   
36.                 {   
37.                     FileStream fs = null;   
38.                     try  
39.                     {   
40.                         fs = file.Open(FileMode.Open, FileAccess.ReadWrite);   
41.                     }   
42.                     catch  
43.                     { continue; }                      
44.                     //  方法二，将文件分批读入缓冲区   
45.                     byte[] data = new byte[2048];   
46.                     int size = 2048;   
47.                     ZipEntry entry = new ZipEntry(Path.GetFileName(file.Name));   
48.                     entry.DateTime = (file.CreationTime > file.LastWriteTime ? file.LastWriteTime : file.CreationTime);   
49.                     s.PutNextEntry(entry);   
50.                     while (true)   
51.                     {   
52.                         size = fs.Read(data, 0, size);   
53.                         if (size <= 0) break;                          
54.                         s.Write(data, 0, size);   
55.                     }   
56.                     fs.Close();   
57.                     file.Delete();   
58.                     Thread.Sleep(SleepTimer);   
59.                 }   
60.             }   
61.             finally  
62.             {   
63.                 s.Finish();   
64.                 s.Close();   
65.             }   
66.         }  
67.         #endregion  
68.         #region 解密、解压缩文件   
69.         /// <summary>   
70.         /// 解压缩文件   
71.         /// </summary>   
72.         /// <param name="GzipFile">压缩包文件名</param>   
73.         /// <param name="targetPath">解压缩目标路径</param>          
74.         public static void Decompress(string GzipFile, string targetPath)   
75.         {    
76.             //string directoryName = Path.GetDirectoryName(targetPath + "\\") + "\\";   
77.             string directoryName = targetPath;   
78.             if (!Directory.Exists(directoryName)) Directory.CreateDirectory(directoryName);//生成解压目录   
79.             string CurrentDirectory = directoryName;   
80.             byte[] data = new byte[2048];   
81.             int size = 2048;   
82.             ZipEntry theEntry = null;              
83.             using (ZipInputStream s = new ZipInputStream(File.OpenRead(GzipFile)))   
84.             {   
85.                 while ((theEntry = s.GetNextEntry()) != null)   
86.                 {   
87.                     if (theEntry.IsDirectory)   
88.                     {// 该结点是目录   
89.                         if (!Directory.Exists(CurrentDirectory + theEntry.Name)) Directory.CreateDirectory(CurrentDirectory + theEntry.Name);   
90.                     }   
91.                     else  
92.                     {   
93.                         if (theEntry.Name != String.Empty)   
94.                         {   
95.                             //解压文件到指定的目录   
96.                             using (FileStream streamWriter = File.Create(CurrentDirectory + theEntry.Name))   
97.                             {   
98.                                 while (true)   
99.                                 {   
100.                                     size = s.Read(data, 0, data.Length);   
101.                                     if (size <= 0) break;   
102.                                       
103.                                     streamWriter.Write(data, 0, size);   
104.                                 }   
105.                                 streamWriter.Close();   
106.                             }   
107.                         }   
108.                     }   
109.                 }   
110.                 s.Close();   
111.             }              
112.         }  
113.         #endregion   
114.     }   
115. }  

前台调用：

/// <summary>

    /// 压缩

    /// </summary>

    /// <param name="sender"></param>

    /// <param name="e"></param>

    protected void btnCompress_Click(object sender, EventArgs e)

    {

        String path = Server.MapPath("~/Files/");

        // 检查文件是否存在

        if (File.Exists(path + "第2章 使用数据库.pdf"))

        {

            FileInfo fi1 = new FileInfo(path + "第2章 使用数据库.pdf");

            FileInfo fi2 = new FileInfo(path + "第3章 使用数据绑定和DataSet.pdf");

            FileInfo fi3 = new FileInfo(path + "第4章 SQL Server XML的功能.pdf");

            FileInfo fi4 = new FileInfo(path + "第5章 XML编程.pdf");

            List<FileInfo> fileList = new List<FileInfo>();

            fileList.Add(fi1);

            fileList.Add(fi2);

            fileList.Add(fi3);

            fileList.Add(fi4);

            //  调用方法

            string targetZipFilePath = Server.MapPath("~/ZipFile/") + "Book.zip";// 扩展名可随意

            Lib.FileCompression.Compress(fileList, targetZipFilePath, 5, 5);

            Response.Write("文件压缩成功，请在ZipFile文件夹查看。");

        }

        else

        {

            Response.Write("被压缩文件不存在，请先解压文件。");

        }     

    }

    /// <summary>

    /// 解压缩

    /// </summary>

    /// <param name="sender"></param>

    /// <param name="e"></param>

    protected void btnDecompress_Click(object sender, EventArgs e)

    {

        string zipFilePath = Server.MapPath("~/ZipFile/") + "Book.zip";//

        if (File.Exists(zipFilePath))

        {

            string targetPath = Server.MapPath("~/Files/");

            Lib.FileCompression.Decompress(zipFilePath, targetPath);

            ////  解压后要删除zip文件

            //File.Delete(zipFilePath);

            Response.Write("文件解压成功，请在Files文件夹查看。");

        }

        else

        {

            Response.Write("压缩文件不存在，请先压缩文件。");

        }

    }

}