学步园

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Text;
using System.IO;
using System.Diagnostics;
using System.IO.Compression;

namespace WebDemo
{
    public partial class FileCompAndDecomp : System.Web.UI.Page
    {
        protected void Page_Load(object sender, EventArgs e)
        {
            if (RequestType())
            {
                string Message = string.Empty;
                string HDCommand = Request["HDCommand"].ToString();
                switch (HDCommand)
                {
                    case "FileComp"://压缩
                        Message = CompressFile(Server.MapPath("yangfeizai/Temp.doc"), Server.MapPath("yangfeizai/Test.rar"));
                        break;
                    case "FileDeComp"://解压
                        Message = DecompressFile(Server.MapPath("yangfeizai/Test.rar"), Server.MapPath("yangfeizai/Result.doc"));
                        break;
                    default:
                        break;
                }
                Response.Write("<script>alert('" + Message + "')</script>");
            }
        }

        #region //判断页面提交方式POST/GET
        public bool RequestType()
        {
            if (HttpContext.Current.Request.RequestType == "POST")
                return true;
            else
                return false;
        }
        #endregion

        #region //文件压缩
        public string CompressFile(string iFile, string oFile)  
        {
            string message = string.Empty;
            //判断文件是否存在      
            if (!File.Exists(iFile))
                return "压缩文件未找到！";
            //创建文件流       
            byte[] buffer = null;   
            FileStream iStream = null;  
            FileStream oStream = null;   
            GZipStream cStream = null;
            try
            {
                //把文件写进数组     
                iStream = new FileStream(iFile, FileMode.Open, FileAccess.Read, FileShare.None);
                buffer = new byte[iStream.Length];
                int num = iStream.Read(buffer, 0, buffer.Length);
                if (num != buffer.Length)
                    return "压缩文件出现异常！";
                //创建文件输出流并输出    
                oStream = new FileStream(oFile, FileMode.Create, FileAccess.Write,FileShare.None);
                cStream = new GZipStream(oStream, CompressionMode.Compress, true);
                cStream.Write(buffer, 0, buffer.Length);
                message = "压缩成功！";
            }
            catch (ApplicationException ex)
            {
                message=ex.Message;
            }          
            finally        
            {               
                //关闭流对象        
                if (iStream != null) iStream.Close();     
                if (cStream != null) cStream.Close();      
                if (oStream != null) oStream.Close();   
            }
            return message;
        }
        #endregion

        #region //文件解压
        public string DecompressFile(string iFile, string oFile)      
        {
            string message = string.Empty;
            //判断文件是否存在         
            if (!File.Exists(iFile))
                return "解压文件为找到！";            
            //创建文件流           
            FileStream iStream = null;     
            FileStream oStream = null;        
            GZipStream dStream = null;
            byte[] qBuffer = new byte[0x10000];
            try
            {
                //把压缩文件写入数组       
                iStream = new FileStream(iFile, FileMode.Open, FileAccess.Read, FileShare.None);
                dStream = new GZipStream(iStream, CompressionMode.Decompress, true);
                //创建输出流并输出    
                oStream = new FileStream(oFile, FileMode.Create, FileAccess.Write, FileShare.None);
                int bytesRead = dStream.Read(qBuffer, 0, qBuffer.Length);
                while (bytesRead > 0)
                {
                    oStream.Write(qBuffer, 0, bytesRead);
                    bytesRead = dStream.Read(qBuffer, 0, qBuffer.Length);
                }
                oStream.Flush();
                message = "解压成功！";
            }
            catch (ApplicationException ex)
            {
                message = ex.Message;
            }          
            finally            
            {              
                //关闭流对象        
                if (iStream != null) iStream.Close();     
                if (dStream != null) dStream.Close();    
                if (oStream != null) oStream.Close();    
            }
            return message;
        }
        #endregion
    }
}