Asp.net 实现选择文件批量下载
一、引用ICSharpCode.SharpZipLib.dlls下载地址 http://www.icsharpcode.net/OpenSource/SharpZipLib/
二、获取含有要打包文件名信息
格式解释：DirFullPath：目录，在哪个文件夹里选择文件
SearchPattern：搜索条件：比如*.doc 选择所有doc格式的文件
fncountent：文件名列表 只单纯的名字 如：ee.txt 只是ee名字s
public static List<string> GetDirFiles(string DirFullPath, string SearchPattern, List<string> fncountent)
{
if (Directory.Exists(DirFullPath) == true)
{
List<string> list = new List<string>();
//获取当前目录下指定文件类型的文件列表
string[] stringList = Directory.GetFiles(DirFullPath, SearchPattern);
foreach (string str in stringList)
{
string fileName;
fileName = System.IO.Path.GetFileNameWithoutExtension(str);
foreach (var s in fncountent)
{
if (fileName.Contains(s))
{
if (list.Where(a => a == fileName).Count() == 0)
{
list.Add(fileName);
}
}
}
}
return list;
}
else
{
return null;
}
}
三、压缩文件文件方法
// <summary>
/// 压缩指定文件生成ZIP文件
/// </summary>
/// <param name="topDirName">顶层文件夹名称 \Storage Card\PDADataExchange\send\xml\</param>
/// <param name="fileNamesToZip">待压缩文件列表 file名 ddd.txt</param>
/// <param name="ZipedFileName">ZIP文件 \Storage Card\PDADataExchange\send\zip\version.zip</param>
/// <param name="CompressionLevel">压缩比 7</param>
/// <param name="password">密码 ""</param>
/// <param name="comment">压缩文件注释文字 ""</param>
public static void ZipFile(string topDirName, string[] fileNamesToZip, string ZipedFileName, int CompressionLevel, string password, string comment)
{
using (ZipOutputStream s = new ZipOutputStream(System.IO.File.Open(ZipedFileName, FileMode.Create)))
{
if (password != null && password.Length > 0)
s.Password = password;
if (comment != null && comment.Length > 0)
s.SetComment(comment);
s.SetLevel(CompressionLevel); // 0 - means store only to 9 - means best compression
foreach (string file in fileNamesToZip)
{
using (FileStream fs = File.OpenRead(Path.Combine(topDirName, file))) //打开待压缩文件
{
byte[] buffer = new byte[fs.Length];
fs.Read(buffer, 0, buffer.Length); //读取文件流
ZipEntry entry = new ZipEntry(file); //新建实例
entry.DateTime = DateTime.Now;
entry.Size = fs.Length;
fs.Close();
s.PutNextEntry(entry);
s.Write(buffer, 0, buffer.Length);
}
}
s.Finish();
s.Close();
}
}
四、返回文件方法
protected void ResponseFile(string filename)
{
FileInfo file = new FileInfo(filename);//创建一个文件对象
Response.Clear();//清除所有缓存区的内容
Response.Charset = "GB2312";//定义输出字符集
Response.ContentEncoding = Encoding.Default;//输出内容的编码为默认编码
Response.AddHeader("Content-Disposition", "attachment;filename=" + file.Name);
//添加头信息。为“文件下载/另存为”指定默认文件名称
Response.AddHeader("Content-Length", file.Length.ToString());
//添加头文件，指定文件的大小，让浏览器显示文件下载的速度
Response.WriteFile(file.FullName);// 把文件流发送到客户端
Response.End();
}
五、具体实现和调用
//压缩后的文件名
var newlist = new List<string>();
//条件要查找的文件s
var path = XMLTools.getXmlValue("UpLoad", "Path");
var filenames = CheckService.GetDirFiles(path, "*.dat", newlist);
var zipname = DateTime.Now.ToString("yyyyMMdd");
var zipdir = path + zipname + ".zip";
if (!File.Exists(zipdir) == true)
{
File.Delete(zipdir);
}
//创建压缩文件
FileStream myFs = new FileStream(zipdir, FileMode.Create);
StreamWriter mySw = new StreamWriter(myFs);
mySw.Close();
myFs.Close();
//把文件压缩到压缩文件
var listY = new List<string>();
foreach (var f in filenames)
{
//var fn = path + f + ".dat";
listY.Add(f + ".dat");
}
var fileNamesToZip = listY.ToArray();
ZipFile(path, fileNamesToZip, zipdir, 7, null, "系统压缩");
ResponseFile(zipdir);