用ASP.Net实现文件的在线压缩和解压缩
我们经常会遇到批量上传的问题，也会遇到将某个目录下所有文件都上传到服务器上的问题。那么，如何解决此类问题呢？以前的技术一般采用activex等方式，这里笔者采用sharpzlib来实现，听说vs2005已有压缩和解压缩的解决方案，笔者还没有时间用vs2005，所以就只好使用vs2003 + sharpzlib来解决问题了。
1、首先从这里下载0.84版本的sharpzlib源码及示例码。
2、下载下来之后你发现它没有vs2003的解决方案文件，没有关系。你可以自己建立，首先新建一个zipunzip的解决方案，然后，将上面经过解压缩之后的所有文件及目录copy到你的解决方案所在的目录下。
3、在vs2003解决方案资源管理器（一般是在右上方中部点的位置）中点击显示所有文件按钮，然后可以见到很多“虚”的图标、文件及文件夹等，可以一次选择它们，然后包含进项目中。
4、编译，最好使用release选项，编译完成之后你可以在\bin\release\看到zipunzip.dll的类了。如果你编译时报错，说什么assemblykeyfile之类的，你可以使用强命名工具新建一个，也可以将assemblyinfo.cs中[assembly: assemblykeyfile("。。。。。")]改成:[assembly: assemblykeyfile("")] (不推荐这样做)。
5、新建一个webform项目，添加zipunzip.dll类的引用，然后添加如下文件及内容：
// ------------------------------------------
// 1. attachmentunzip.cs
// ------------------------------------------
using system;
using system.io;
using icsharpcode.sharpziplib.zip;
using icsharpcode.sharpziplib.gzip;
using icsharpcode.sharpziplib.bzip2;
using icsharpcode.sharpziplib.checksums;
using icsharpcode.sharpziplib.zip.compression;
using icsharpcode.sharpziplib.zip.compression.streams;
namespace webzipunzip
{
public class attachmentunzip
{
public attachmentunzip()
{
}
public static void upzip(string zipfile)
{
string []fileproperties=new string[2];
fileproperties[0]=zipfile;//待解压的文件
fileproperties[1]=zipfile.substring(0,zipfile.lastindexof("\\")+1);//解压后放置的目标目录
unzipclass unzc=new unzipclass();
unzc.unzip(fileproperties);
}
}
}
// ---------------------------------------------
// 2. unzipclass.cs
// ---------------------------------------------
using system;
using system.io;
using icsharpcode.sharpziplib.zip;
using icsharpcode.sharpziplib.gzip;
using icsharpcode.sharpziplib.bzip2;
using icsharpcode.sharpziplib.checksums;
using icsharpcode.sharpziplib.zip.compression;
using icsharpcode.sharpziplib.zip.compression.streams;
namespace webzipunzip
{
public class unzipclass
{
/// <summary>
/// 解压文件
/// </summary>
/// <param name="args">包含要解压的文件名和要解压到的目录名数组</param>
public void unzip(string[] args)
{
zipinputstream s = new zipinputstream(file.openread(args[0]));
try
{
zipentry theentry;
while ((theentry = s.getnextentry()) != null)
{
string directoryname = path.getdirectoryname(args[1]);
string filename = path.getfilename(theentry.name);
//生成解压目录
directory.createdirectory(directoryname);
if (filename != string.empty)
{
//解压文件到指定的目录
filestream streamwriter = file.create(args[1]+filename);
int size = 2048;
byte[] data = new byte[2048];
while (true)
{
size = s.read(data, 0, data.length);
if (size > 0)
{
streamwriter.write(data, 0, size);
}
else
{
break;
}
}
streamwriter.close();
}
}
s.close();
}
catch(exception eu)
{
throw eu;
}
finally
{
s.close();
}
}//end unzip
public static bool unzipfile(string file, string dir)
{
try
{
if (!directory.exists(dir))
directory.createdirectory(dir);
string filefullname = path.combine(dir,file);
zipinputstream s = new zipinputstream(file.openread( filefullname ));
zipentry theentry;
while ((theentry = s.getnextentry()) != null)
{
string directoryname = path.getdirectoryname(theentry.name);
string filename = path.getfilename(theentry.name);
if (directoryname != string.empty)
directory.createdirectory( path.combine(dir, directoryname));
if (filename != string.empty)
{
filestream streamwriter = file.create( path.combine(dir,theentry.name) );
int size = 2048;
byte[] data = new byte[2048];
while (true)
{
size = s.read(data, 0, data.length);
if (size > 0)
{
streamwriter.write(data, 0, size);
}
else
{
break;
}
}
streamwriter.close();
}
}
s.close();
return true;
}
catch (exception)
{
throw;
}
}
}//end unzipclass
}
// ----------------------------------------------
// 3. zipclass.cs
// ----------------------------------------------
using system;
using system.io;
using icsharpcode.sharpziplib.zip;
using icsharpcode.sharpziplib.gzip;
using icsharpcode.sharpziplib.bzip2;
using icsharpcode.sharpziplib.checksums;
using icsharpcode.sharpziplib.zip.compression;
using icsharpcode.sharpziplib.zip.compression.streams;
namespace webzipunzip
{
/// <summary>
/// 压缩文件
/// </summary>
public class zipclass
{
public void zipfile(string filetozip, string zipedfile ,int compressionlevel, int blocksize,string password)
{
//如果文件没有找到，则报错
if (! system.io.file.exists(filetozip))
{
throw new system.io.filenotfoundexception("the specified file " + filetozip + " could not be found. zipping aborderd");
}
system.io.filestream streamtozip = new system.io.filestream(filetozip,system.io.filemode.open , system.io.fileaccess.read);
system.io.filestream zipfile = system.io.file.create(zipedfile);
zipoutputstream zipstream = new zipoutputstream(zipfile);
zipentry zipentry = new zipentry("zippedfile");
zipstream.putnextentry(zipentry);
zipstream.setlevel(compressionlevel);
byte[] buffer = new byte[blocksize];
system.int32 size =streamtozip.read(buffer,0,buffer.length);
zipstream.write(buffer,0,size);
try
{
while (size < streamtozip.length)
{
int sizeread =streamtozip.read(buffer,0,buffer.length);
zipstream.write(buffer,0,sizeread);
size += sizeread;
}
}
catch(system.exception ex)
{
throw ex;
}
zipstream.finish();
zipstream.close();
streamtozip.close();
}
public void zipfilemain(string[] args)
{
//string[] filenames = directory.getfiles(args[0]);
string[] filenames = new string[]{args[0]};
crc32 crc = new crc32();
zipoutputstream s = new zipoutputstream(file.create(args[1]));
s.setlevel(6); // 0 - store only to 9 - means best compression
foreach (string file in filenames)
{
//打开压缩文件
filestream fs = file.openread(file);
byte[] buffer = new byte[fs.length];
fs.read(buffer, 0, buffer.length);
zipentry entry = new zipentry(file);
entry.datetime = datetime.now;
// set size and the crc, because the information
// about the size and crc should be stored in the header
// if it is not set it is automatically written in the footer.
// (in this case size == crc == -1 in the header)
// some zip programs have problems with zip files that don't store
// the size and crc in the header.
entry.size = fs.length;
fs.close();
crc.reset();
crc.update(buffer);
entry.crc = crc.value;
s.putnextentry(entry);
s.write(buffer, 0, buffer.length);
}
s.finish();
s.close();
}
}
}
// ---------------------------------------------
// 4. webform1.aspx
// ---------------------------------------------
<%@ page language="c#" codebehind="webform1.aspx.cs" autoeventwireup="false" inherits="webzipunzip.webform1" %>
<meta content="microsoft visual studio .net 7.1" name=generator>
<meta content=c# name=code_language>
<meta content=javascript name=vs_defaultclientscript>
<meta content=http://schemas.microsoft.com/intellisense/ie5 name=vs_targetschema>
<form id=form1 method=post runat="server"><?xml:namespace prefix = asp /><asp:button id=button1 style="z-index: 101; left: 56px; position: absolute; top: 64px" runat="server" text="压缩"></asp:button><asp:button id=button2 style="z-index: 102; left: 112px; position: absolute; top: 64px" runat="server" text="解压"></asp:button><input id=file1 style="z-index: 103; left: 32px; position: absolute; top: 24px" type=file name=file1 runat="server"> </form></body></html>
//-------------------------------------------
// 5.webform1.aspx.cs
//-------------------------------------------
using system;
using system.collections;
using system.componentmodel;
using system.data;
using system.drawing;
using system.io;
using system.web;
using system.web.sessionstate;
using system.web.ui;
using system.web.ui.webcontrols;
using system.web.ui.htmlcontrols;
namespace webzipunzip
{
/// <summary>
/// summary description for webform1.
/// </summary>
public class webform1 : system.web.ui.page
{
protected system.web.ui.webcontrols.button button1;
protected system.web.ui.htmlcontrols.htmlinputfile file1;
protected system.web.ui.webcontrols.button button2;
private void page_load(object sender, system.eventargs e)
{
// put user code to initialize the page here
}
#region web form designer generated code
override protected void oninit(eventargs e)
{
//
// codegen: this call is required by the asp.net web form designer.
//
initializecomponent();
base.oninit(e);
}
/// <summary>
/// required method for designer support - do not modify
/// the contents of this method with the code editor.
/// </summary>
private void initializecomponent()
{
this.button1.click += new system.eventhandler(this.button1_click);
this.button2.click += new system.eventhandler(this.button2_click);
this.load += new system.eventhandler(this.page_load);
}
#endregion
#region 压缩
private void button1_click(object sender, system.eventargs e)
{
string []fileproperties=new string[2];
string fullname=this.file1.postedfile.filename;//c:\test\a.txt
string destpath=system.io.path.getdirectoryname(fullname);//c:\test
//待压缩文件
fileproperties[0]=fullname;
//压缩后的目标文件
fileproperties[1]= destpath +"\\"+ system.io.path.getfilenamewithoutextension(fullname) + ".zip";
zipclass zc=new zipclass();
zc.zipfilemain(fileproperties);
//删除压缩前的文件
system.io.file.delete(fullname);
}
#endregion
#region 解压
private void button2_click(object sender, system.eventargs e)
{
string fullname=this.file1.postedfile.filename;//c:\test\a.zip
//解压文件
//attachmentunzip.upzip(fullname);
// string[] fileproperties = new string[2];
// fileproperties[0] = fullname;//待解压的文件
// fileproperties[1] = system.io.path.getdirectoryname(fullname);//解压后放置的目标目录
// unzipclass unzc=new unzipclass();
// unzc.unzip(fileproperties);
string dir = system.io.path.getdirectoryname(fullname);
string filename = system.io.path.getfilename(fullname);
unzipclass.unzipfile(filename, dir);
}
#endregion
}
}
ok! 试试看。
此方案解决了文件名中文字的问题，目录解压缩问题。
至于整个文件夹批量上传并压缩成一个winzip压缩包的问题，没有时间解决了，各位如有解决方案，不妨共享一下。