ASP.NET 文件压缩解压类(C#)
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2023-12-12 19:15:34
本文实例讲述了asp.net c#实现解压缩文件的方法,需要引用一个icsharpcode.sharpziplib.dll,供大家参考,具体如下:
using...
本文实例讲述了asp.net c#实现解压缩文件的方法,需要引用一个icsharpcode.sharpziplib.dll,供大家参考,具体如下:
using system; using system.collections.generic; using system.linq; using system.text; using icsharpcode.sharpziplib.zip; using system.io; using icsharpcode.sharpziplib.checksums; using system.web; namespace mvc51hiring.common.tool { /// <summary> <br> /// 作者:来自网格<br> /// 修改人:sunkaixaun /// 压缩和解压文件 /// </summary> public class zipclass { /// <summary> /// 所有文件缓存 /// </summary> list<string> files = new list<string>(); /// <summary> /// 所有空目录缓存 /// </summary> list<string> paths = new list<string>(); /// <summary> /// 压缩单个文件根据文件地址 /// </summary> /// <param name="filetozip">要压缩的文件</param> /// <param name="zipedfile">压缩后的文件全名</param> /// <param name="compressionlevel">压缩程度,范围0-9,数值越大,压缩程序越高</param> /// <param name="blocksize">分块大小</param> public void zipfile(string filetozip, string zipedfile, int compressionlevel, int blocksize) { if (!system.io.file.exists(filetozip))//如果文件没有找到,则报错 { throw new filenotfoundexception("the specified file " + filetozip + " could not be found. zipping aborderd"); } filestream streamtozip = new filestream(filetozip, filemode.open, fileaccess.read); filestream zipfile = file.create(zipedfile); zipoutputstream zipstream = new zipoutputstream(zipfile); zipentry zipentry = new zipentry(filetozip); zipstream.putnextentry(zipentry); zipstream.setlevel(compressionlevel); byte[] buffer = new byte[blocksize]; int 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 (exception ex) { gc.collect(); throw ex; } zipstream.finish(); zipstream.close(); streamtozip.close(); gc.collect(); } /// <summary> /// 压缩目录(包括子目录及所有文件) /// </summary> /// <param name="rootpath">要压缩的根目录</param> /// <param name="destinationpath">保存路径</param> /// <param name="compresslevel">压缩程度,范围0-9,数值越大,压缩程序越高</param> public void zipfilefromdirectory(string rootpath, string destinationpath, int compresslevel) { getalldirectories(rootpath); /* while (rootpath.lastindexof("\\") + 1 == rootpath.length)//检查路径是否以"\"结尾 { rootpath = rootpath.substring(0, rootpath.length - 1);//如果是则去掉末尾的"\" } */ //string rootmark = rootpath.substring(0, rootpath.lastindexof("\\") + 1);//得到当前路径的位置,以备压缩时将所压缩内容转变成相对路径。 string rootmark = rootpath + "\\";//得到当前路径的位置,以备压缩时将所压缩内容转变成相对路径。 crc32 crc = new crc32(); zipoutputstream outputstream = new zipoutputstream(file.create(destinationpath)); outputstream.setlevel(compresslevel); // 0 - store only to 9 - means best compression foreach (string file in files) { filestream filestream = file.openread(file);//打开压缩文件 byte[] buffer = new byte[filestream.length]; filestream.read(buffer, 0, buffer.length); zipentry entry = new zipentry(file.replace(rootmark, string.empty)); 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 = filestream.length; filestream.close(); crc.reset(); crc.update(buffer); entry.crc = crc.value; outputstream.putnextentry(entry); outputstream.write(buffer, 0, buffer.length); } this.files.clear(); foreach (string emptypath in paths) { zipentry entry = new zipentry(emptypath.replace(rootmark, string.empty) + "/"); outputstream.putnextentry(entry); } this.paths.clear(); outputstream.finish(); outputstream.close(); gc.collect(); } /// <summary> /// 多文件打包下载 /// </summary> public void dwonloadzip(string[] filepathlist, string zipname) { memorystream ms = new memorystream(); byte[] buffer = null; var context = httpcontext.current; using (icsharpcode.sharpziplib.zip.zipfile file = icsharpcode.sharpziplib.zip.zipfile.create(ms)) { file.beginupdate(); file.nametransform = new mynametransfom();//通过这个名称格式化器,可以将里面的文件名进行一些处理。默认情况下,会自动根据文件的路径在zip中创建有关的文件夹。 foreach (var it in filepathlist) { file.add(context.server.mappath(it)); } file.commitupdate(); buffer = new byte[ms.length]; ms.position = 0; ms.read(buffer, 0, buffer.length); } context.response.addheader("content-disposition", "attachment;filename=" + zipname); context.response.binarywrite(buffer); context.response.flush(); context.response.end(); } /// <summary> /// 取得目录下所有文件及文件夹,分别存入files及paths /// </summary> /// <param name="rootpath">根目录</param> private void getalldirectories(string rootpath) { string[] subpaths = directory.getdirectories(rootpath);//得到所有子目录 foreach (string path in subpaths) { getalldirectories(path);//对每一个字目录做与根目录相同的操作:即找到子目录并将当前目录的文件名存入list } string[] files = directory.getfiles(rootpath); foreach (string file in files) { this.files.add(file);//将当前目录中的所有文件全名存入文件list } if (subpaths.length == files.length && files.length == 0)//如果是空目录 { this.paths.add(rootpath);//记录空目录 } } /// <summary> /// 解压缩文件(压缩文件中含有子目录) /// </summary> /// <param name="zipfilepath">待解压缩的文件路径</param> /// <param name="unzippath">解压缩到指定目录</param> /// <returns>解压后的文件列表</returns> public list<string> unzip(string zipfilepath, string unzippath) { //解压出来的文件列表 list<string> unzipfiles = new list<string>(); //检查输出目录是否以“\\”结尾 if (unzippath.endswith("\\") == false || unzippath.endswith(":\\") == false) { unzippath += "\\"; } zipinputstream s = new zipinputstream(file.openread(zipfilepath)); zipentry theentry; while ((theentry = s.getnextentry()) != null) { string directoryname = path.getdirectoryname(unzippath); string filename = path.getfilename(theentry.name); //生成解压目录【用户解压到硬盘根目录时,不需要创建】 if (!string.isnullorempty(directoryname)) { directory.createdirectory(directoryname); } if (filename != string.empty) { //如果文件的压缩后大小为0那么说明这个文件是空的,因此不需要进行读出写入 if (theentry.compressedsize == 0) break; //解压文件到指定的目录 directoryname = path.getdirectoryname(unzippath + theentry.name); //建立下面的目录和子目录 directory.createdirectory(directoryname); //记录导出的文件 unzipfiles.add(unzippath + theentry.name); filestream streamwriter = file.create(unzippath + 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(); gc.collect(); return unzipfiles; } } public class mynametransfom : icsharpcode.sharpziplib.core.inametransform { #region inametransform 成员 public string transformdirectory(string name) { return null; } public string transformfile(string name) { return path.getfilename(name); } #endregion } }
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