前台多选文件，在后台进行打包成一个压缩文件进行下载
效果
实现方式
string imageurl = ConfigurationManager.AppSettings["fileplanurl"];
//勾选的编号，
string[] keyId = keyValue.Split(',');
List<string> listFJ = new List<string>();//保存附件路径
for (int i = 0; i < keyId.Length; i++)
{
var keys = keyId[i];
var data = service.GetFileEntity(keys);//查询条数据（也就相当于select *from a where id=1 ）
string filename = Server.UrlDecode(data.FileName);//返回客户端文件名称
string filepath = imageurl + data.FilePath;
listFJ.Add(filepath);
}
string time = DateTime.Now.Ticks.ToString();
string filezip = imageurl + time + ".zip";
ZipFile(listFJ, filezip); //对文件进行压缩
DownloadFile(Server.UrlEncode("附件.zip"), filezip);//下载文件（文件下载）
private void DownloadFile(string fileName, string filePath)
{
FileInfo fileInfo = new FileInfo(filePath);
Response.Clear();
Response.ClearContent();
Response.ClearHeaders();
Response.AddHeader("Content-Disposition", "attachment;filename=" + fileName);
Response.AddHeader("Content-Length", fileInfo.Length.ToString());
Response.AddHeader("Content-Transfer-Encoding", "binary");
Response.ContentType = "application/octet-stream";
Response.ContentEncoding = System.Text.Encoding.GetEncoding("gb2312");
Response.WriteFile(fileInfo.FullName);
Response.Flush();
System.IO.File.Delete(filePath);//删除已下载文件
Response.End();
}
下面的封装的类
public class ZipHelper
{
/// <summary>
/// 压缩单个文件
/// </summary>
/// <param name="fileToZip">要压缩的文件</param>
/// <param name="zipedFile">压缩后的文件</param>
/// <param name="compressionLevel">压缩等级</param>
/// <param name="blockSize">每次写入大小</param>
public static void ZipFile(string fileToZip, string zipedFile, int compressionLevel, int blockSize)
{
//如果文件没有找到，则报错
if (!System.IO.File.Exists(fileToZip))
{
throw new System.IO.FileNotFoundException("指定要压缩的文件: " + fileToZip + " 不存在!");
}
using (System.IO.FileStream ZipFile = System.IO.File.Create(zipedFile))
{
using (ZipOutputStream ZipStream = new ZipOutputStream(ZipFile))
{
using (System.IO.FileStream StreamToZip = new System.IO.FileStream(fileToZip, System.IO.FileMode.Open, System.IO.FileAccess.Read))
{
string fileName = fileToZip.Substring(fileToZip.LastIndexOf("\") + 1);
ZipEntry ZipEntry = new ZipEntry(fileName);
ZipStream.PutNextEntry(ZipEntry);
ZipStream.SetLevel(compressionLevel);
byte[] buffer = new byte[blockSize];
int sizeRead = 0;
try
{
do
{
sizeRead = StreamToZip.Read(buffer, 0, buffer.Length);
ZipStream.Write(buffer, 0, sizeRead);
}
while (sizeRead > 0);
}
catch (System.Exception ex)
{
throw ex;
}
StreamToZip.Close();
}
ZipStream.Finish();
ZipStream.Close();
}
ZipFile.Close();
}
}
/// <summary>
/// 压缩单个文件
/// </summary>
/// <param name="fileToZip">要进行压缩的文件名</param>
/// <param name="zipedFile">压缩后生成的压缩文件名</param>
public static void ZipFile(string fileToZip, string zipedFile)
{
//如果文件没有找到，则报错
if (!File.Exists(fileToZip))
{
throw new System.IO.FileNotFoundException("指定要压缩的文件: " + fileToZip + " 不存在!");
}
using (FileStream fs = File.OpenRead(fileToZip))
{
byte[] buffer = new byte[fs.Length];
fs.Read(buffer, 0, buffer.Length);
fs.Close();
using (FileStream ZipFile = File.Create(zipedFile))
{
using (ZipOutputStream ZipStream = new ZipOutputStream(ZipFile))
{
string fileName = fileToZip.Substring(fileToZip.LastIndexOf("\") + 1);
ZipEntry ZipEntry = new ZipEntry(fileName);
ZipStream.PutNextEntry(ZipEntry);
ZipStream.SetLevel(5);
ZipStream.Write(buffer, 0, buffer.Length);
ZipStream.Finish();
ZipStream.Close();
}
}
}
}
/// <summary>
/// 压缩文件
/// </summary>
/// <param name="copyTopath">压缩到哪个路径</param>
/// <param name="zipFileName">压缩文件名称</param>
public static void ZipFile(List<string> sourceFileNames, string zipFileName)
{
//压缩文件打包
using (ZipOutputStream s = new ZipOutputStream(File.Create(zipFileName)))
{
s.SetLevel(9);
byte[] buffer = new byte[4096];
foreach (string file in sourceFileNames)
{
if (Directory.Exists(file))// 先当作目录处理如果存在这个目录就递归Copy该目录下面的文件
{
string pPath = "";
pPath += Path.GetFileName(file);
pPath += "\";
ZipSetp(file, s, pPath, sourceFileNames);
}
else // 否则直接压缩文件
{
ZipEntry entry = new ZipEntry(Path.GetFileName(file));
entry.DateTime = DateTime.Now;
s.PutNextEntry(entry);
using (FileStream fs = File.OpenRead(file))
{
int sourceBytes;
do
{
sourceBytes = fs.Read(buffer, 0, buffer.Length);
s.Write(buffer, 0, sourceBytes);
} while (sourceBytes > 0);
}
}
}
s.Finish();
s.Close();
}
}
/// <summary>
/// 压缩多层目录
/// </summary>
/// <param name="strDirectory">待压缩目录</param>
/// <param name="zipedFile">压缩后生成的压缩文件名，绝对路径</param>
public static void ZipFileDirectory(string strDirectory, string zipedFile)
{
using (System.IO.FileStream ZipFile = System.IO.File.Create(zipedFile))
{
using (ZipOutputStream s = new ZipOutputStream(ZipFile))
{
s.SetLevel(9);
ZipSetp(strDirectory, s, "");
}
}
}
/// <summary>
/// 压缩多层目录
/// </summary>
/// <param name="strDirectory">待压缩目录</param>
/// <param name="zipedFile">压缩后生成的压缩文件名，绝对路径</param>
/// <param name="files">指定要压缩的文件列表(完全路径)</param>
public static void ZipFileDirectory(string strDirectory, string zipedFile, List<string> files)
{
using (System.IO.FileStream ZipFile = System.IO.File.Create(zipedFile))
{
using (ZipOutputStream s = new ZipOutputStream(ZipFile))
{
s.SetLevel(9);
ZipSetp(strDirectory, s, "", files);
}
}
}
/// <summary>
/// 递归遍历目录
/// </summary>
/// <param name="strDirectory">The directory.</param>
/// <param name="s">The ZipOutputStream Object.</param>
/// <param name="parentPath">The parent path.</param>
/// <param name="files">需要压缩的文件</param>
private static void ZipSetp(string strDirectory, ZipOutputStream s, string parentPath, List<string> files = null)
{
if (strDirectory[strDirectory.Length - 1] != Path.DirectorySeparatorChar)
{
strDirectory += Path.DirectorySeparatorChar;
}
string[] filenames = Directory.GetFileSystemEntries(strDirectory);
byte[] buffer = new byte[4096];
foreach (string file in filenames)// 遍历所有的文件和目录
{
if (files != null && !files.Contains(file))
{
continue;
}
if (Directory.Exists(file))// 先当作目录处理如果存在这个目录就递归Copy该目录下面的文件
{
string pPath = parentPath;
pPath += Path.GetFileName(file);
pPath += "\";
ZipSetp(file, s, pPath, files);
}
else // 否则直接压缩文件
{
//打开压缩文件
string fileName = parentPath + Path.GetFileName(file);
ZipEntry entry = new ZipEntry(fileName);
entry.DateTime = DateTime.Now;
s.PutNextEntry(entry);
using (FileStream fs = File.OpenRead(file))
{
int sourceBytes;
do
{
sourceBytes = fs.Read(buffer, 0, buffer.Length);
s.Write(buffer, 0, sourceBytes);
} while (sourceBytes > 0);
}
}
}
}
/// <summary>
/// 解压缩一个 zip 文件。
/// </summary>
/// <param name="zipedFile">压缩文件</param>
/// <param name="strDirectory">解压目录</param>
/// <param name="password">zip 文件的密码。</param>
/// <param name="overWrite">是否覆盖已存在的文件。</param>
public static void UnZip(string zipedFile, string strDirectory, bool overWrite, string password)
{
if (strDirectory == "")
strDirectory = Directory.GetCurrentDirectory();
if (!strDirectory.EndsWith("\"))
strDirectory = strDirectory + "\";
using (ZipInputStream s = new ZipInputStream(File.OpenRead(zipedFile)))
{
if (password != null)
{
s.Password = password;
}
ZipEntry theEntry;
while ((theEntry = s.GetNextEntry()) != null)
{
string directoryName = "";
string pathToZip = "";
pathToZip = theEntry.Name;
if (pathToZip != "")
directoryName = Path.GetDirectoryName(pathToZip) + "\";
string fileName = Path.GetFileName(pathToZip);
Directory.CreateDirectory(strDirectory + directoryName);
if (fileName != "")
{
if ((File.Exists(strDirectory + directoryName + fileName) && overWrite) || (!File.Exists(strDirectory + directoryName + fileName)))
{
using (FileStream streamWriter = File.Create(strDirectory + directoryName + 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();
}
}
/// <summary>
/// 解压缩一个 zip 文件。
/// </summary>
/// <param name="zipedFile">压缩文件</param>
/// <param name="strDirectory">解压目录</param>
/// <param name="overWrite">是否覆盖已存在的文件。</param>
public static void UnZip(string zipedFile, string strDirectory, bool overWrite)
{
UnZip(zipedFile, strDirectory, overWrite, null);
}
/// <summary>
/// 解压缩一个 zip 文件。
/// 覆盖已存在的文件。
/// </summary>
/// <param name="zipedFile">压缩文件</param>
/// <param name="strDirectory">解压目录</param>
public static void UnZip(string zipedFile, string strDirectory)
{
UnZip(zipedFile, strDirectory, true);
}
/// <summary>
/// 获取压缩文件中指定类型的文件
/// </summary>
/// <param name="zipedFile">压缩文件</param>
/// <param name="fileExtension">文件类型(.txt|.exe)</param>
/// <returns>文件名称列表(包含子目录)</returns>
public static List<string> GetFiles(string zipedFile, List<string> fileExtension)
{
List<string> files = new List<string>();
if (!File.Exists(zipedFile))
{
//return files;
throw new FileNotFoundException(zipedFile);
}
using (ZipInputStream s = new ZipInputStream(File.OpenRead(zipedFile)))
{
ZipEntry theEntry;
while ((theEntry = s.GetNextEntry()) != null)
{
if (theEntry.IsFile)
{
//Console.WriteLine("Name : {0}", theEntry.Name);
if (fileExtension != null)
{
if (fileExtension.Contains(Path.GetExtension(theEntry.Name)))
{
files.Add(theEntry.Name);
}
}
else
{
files.Add(theEntry.Name);
}
}
}
s.Close();
}
return files;
}
/// <summary>
/// 获取压缩文件中的所有文件
/// </summary>
/// <param name="zipedFile">压缩文件</param>
/// <returns>文件名称列表(包含子目录)</returns>
public static List<string> GetFiles(string zipedFile)
{
return GetFiles(zipedFile, null);
}
}