使用SharpZip压缩与解压缩的实战经验

这篇文章原是我在 CSDN 论坛发的一篇帖子（http://search.csdn.net/expert/topicview1.asp?id=2377844），现把它“顺”（整）理成章。

 

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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