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  • c#压缩和解压缩文件

    使用SharpZip压缩与解压缩的实战经验
    2007-08-17 09:39
     
    首先,在 http://www.icsharpcode.net/OpenSource/SharpZipLib/Default.aspx 下载源码,找到“ZipConstants.cs”修改

    public static string ConvertToString(byte[] data)
    {
          return Encoding.GetEncoding("gb2312").GetString(data, 0, data.Length);
          //return Encoding.ASCII.GetString(data,0, data.Length);
    }
      
    public static byte[] ConvertToArray(string str)
    {
           return Encoding.GetEncoding("gb2312").GetBytes(str);
           //return Encoding.ASCII.GetBytes(str);
    }

    如此就可支持中文名称了
    以下是我写的压缩与解压缩的代码:

    using System;
    using System.Collections;
    using System.ComponentModel;
    using System.Data;
    using System.Drawing;
    using System.Web;
    using System.Web.SessionState;
    using System.Web.UI;
    using System.Web.UI.WebControls;
    using System.Web.UI.HtmlControls;
    using ICSharpCode.SharpZipLib.Zip;

    namespace OA
    {
             /// <summary>
             /// WebForm1 的摘要说明。
             /// </summary>
             public class WebForm1 : System.Web.UI.Page
             {
                  public string ServerDir;
                  private void Page_Load(object sender, System.EventArgs e)
                   {
                    // 在此处放置用户代码以初始化页面
                         this.ServerDir = Page.MapPath(".");
                         this.ZipFile("01.txt*02.txt*000.zip");  //只是示例,具体的大家自己去实现
                         this.ZipFile("01.txt*02.txt*001.zip");
                         this.UnZipFile("000.zip*001.zip");
             }


             public string ShortDir(string s)
             {
                  //将文件的绝对路径转为相对路径
                   string d=s.Replace(ServerDir,"");
                   return d;
             }



             //压缩文件 p 为客户端传回来的文件列表:文件名+压缩包的名称
              public void ZipFile(string p)
               {
                       string[] tmp = p.Split(new char[]{'*'});  //分离文件列表
                       if(tmp[tmp.Length-1]!="")  //压缩包名称不为空
                         {
                               ZipOutputStream u = new ZipOutputStream(File.Create(ServerDir+tmp[tmp.Length-1]));            //新建压缩文件流 “ZipOutputStream”
                              for(int i =0;i<tmp.Length-1;i++)
                               {
                                     if(tmp[i]!="")  //分离出来的文件名不为空
                                      {
                                              this.AddZipEntry(tmp[i],u,out u); //向压缩文件流加入内容
                                      }
                                }
                                u.Finish(); // 结束压缩
                                u.Close();
                          }
                 }

                 //添加压缩项目:p 为需压缩的文件或文件夹; u 为现有的源ZipOutputStream;  out j为已添加“ZipEntry”的“ZipOutputStream”
                  public void AddZipEntry(string p,ZipOutputStream u,out ZipOutputStream j)
                  {
                       string s =ServerDir+p;

                       if(Directory.Exists(s)) //文件夹的处理
                        {
                              DirectoryInfo di = new DirectoryInfo(s);

                             //***********以下内容是修订后添加的***********

                             if(di.GetDirectories().Length<=0)   //没有子目录
                               {
                                         ZipEntry z = new ZipEntry(p+""""); //末尾“""”用于文件夹的标记
                                          u.PutNextEntry(z);
                                }

                                 //***************以上内容是修订后添加的***************


                               foreach(DirectoryInfo tem in di.GetDirectories()) //获取子目录
                                 {
                                         ZipEntry z = new ZipEntry(this.ShortDir(tem.FullName)+""""); //末尾“""”用于文件夹的标记
                                          u.PutNextEntry(z);    //此句不可少,否则空目录不会被添加
                                          s = this.ShortDir(tem.FullName);
                                         this.AddZipEntry(s,u,out u);       //递归
                                }
                                foreach(FileInfo temp in di.GetFiles())  //获取此目录的文件
                                {
                                          s = this.ShortDir(temp.FullName);
                                         this.AddZipEntry(s,u,out u);       //递归
                                }
                          }
                         else if(File.Exists(s)) //文件的处理
                          {
                                    u.SetLevel(9);      //压缩等级
                                     FileStream f = File.OpenRead(s);
                                    byte[] b = new byte[f.Length];
                                     f.Read(b,0,b.Length);           //将文件流加入缓冲字节中
                                    ZipEntry z = new ZipEntry(this.ShortDir(s));
                                    u.PutNextEntry(z);              //为压缩文件流提供一个容器
                                    u.Write(b,0,b.Length); //写入字节
                                    f.Close();
                           }
                           j=u;    //返回已添加数据的“ZipOutputStream”
                   }


                   public void UnZipFile(string p)   //解压缩
                   {
                       string[] un_tmp = p.Split(new char[]{'*'});
                       int i2=0;  //防止名称冲突的参数
                       for(int j=0;j<un_tmp.Length;j++)
                        {
                             if(un_tmp[j]!="")
                              {
                                     string un_time=System.DateTime.Now.ToShortDateString()+"-"+System.DateTime.Now.Hour.ToString()+"-"+System.DateTime.Now.Minute.ToString()+"-"+(System.DateTime.Now.Second+i2).ToString();
                                     string un_dir =ServerDir+"Unzip-"+un_time;
                                      Directory.CreateDirectory(un_dir);     //创建以解压时间为名称的文件夹
                                      ZipInputStream f = new ZipInputStream(File.OpenRead(ServerDir+un_tmp[j])); //读取压缩文件,并用此文件流新建 “ZipInputStream”对象

                                      A:   ZipEntry zp = f.GetNextEntry();    //获取解压文件流中的项目。 另注(我的理解):在压缩包里每个文件都以“ZipEntry”形式存在,其中包括存放文件的目录信息。如果空目录被压缩,该目录下将出现一个名称为空、大小为 0 、“Crc”属性为 00000000 的“文件”。此文件只是个标记,不会被解压。

                                     while(zp!=null)
                                      {
                                           string un_tmp2;
                                             if(zp.Name.IndexOf("
    """)>=0) //获取文件的目录信息
                                             {
                                                     int tmp1 = zp.Name.LastIndexOf("""");
                                                      un_tmp2 = zp.Name.Substring(0,tmp1);
                                                      Directory.CreateDirectory(un_dir+"
    """+un_tmp2+""""); //必须先创建目录,否则解压失败 --- (A) 关系到下面的步骤(B)
                                             }
                                             if(!zp.IsDirectory&&zp.Crc!=00000000L) //此“ZipEntry”不是“标记文件”
                                               {
                                                      int i =2048;
                                                     byte[] b = new byte[i];  //每次缓冲 2048 字节
                                                      FileStream s= File.Create(un_dir+"
    """+zp.Name); //(B)-新建文件流
                                                     while(true) //持续读取字节,直到一个“ZipEntry”字节读完
                                                      {
                                                             i = f.Read(b,0,b.Length); //读取“ZipEntry”中的字节
                                                             if(i>0)
                                                              {
                                                                        s.Write(b,0,i); //将字节写入新建的文件流
                                                              }
                                                             else
                                                              {
                                                                       break; //读取的字节为 0 ,跳出循环
                                                              }
                                                      }
                                                      s.Close();
                                                }
                                                goto A; //进入下一个“ZipEntry”
                                          }
                                          f.Close();
                                          i2++;
                              }
                         }
                   }
             }
    }

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  • 原文地址:https://www.cnblogs.com/zengwei/p/865778.html
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