整个思路是这样的：
1.查询数据库中的文件流放到datatable中
2.循环datatable将文件流一个个生成文件，放到对应的文件夹中，
3.下载某个文件夹下的所有文件
a.循环这个文件夹下的所有文件，调用zip()方法压缩到zipSteam中
b.将zipStream流保存为一个.zip文件
4.返回给前端压缩成功
5.前端用window.open(“压缩文件.zip”)下载压缩文件
这个程序是几年前写的，比较绕，不是个最佳方法，应该有更好的。
优化思路：
1.将数据库中查询出来的文件流直接调用zip()方法压缩到zipSteam,然后将zipSteam压缩文件流直接输出给前端，这样优化后才是最好的做法，待优化
private void DownLaodZip2017(HttpContext context)
{
ZipFloClass zc = new ZipFloClass();
string res_str = context.Request.Form["list"].ToString();
//string res_str = "2,4,6";
string[] data = res_str.Split(‘,‘);
OunamesFilesToFiles(data);
for (int i = 0; i < data.Length; i++)
{
string doc_path = context.Server.MapPath("~/ProjectMgt/Doc2017") + "\\" + data[i].Trim() + "\\";
string zip_path = context.Server.MapPath("~/ProjectMgt/Doc2017/zip/zip") + "\\" + data[i].Trim() + ".zip";
if (Directory.Exists(doc_path))
{
zc.ZipFile(doc_path, zip_path);
}
}
string zip_Path = context.Server.MapPath("~/ProjectMgt/Doc2017/zip/zip");
string zip_Name = context.Server.MapPath("~/ProjectMgt/Doc2017/zip/打包数据.zip");
if (File.Exists(zip_Name))
{
File.Delete(zip_Name);
}
zc.ZipFile(zip_Path, zip_Name);
string[] paths = Directory.GetFiles(zip_Path);
for (int n = 0; n < paths.Length; n++)
{
File.Delete(paths[n]);
}
context.Response.Write("{success:true, files:‘生成文件成功‘}");
}
private void DownLaodZip(HttpContext context)
{
if (context.Request["type"] != null)
{
ZipFloClass zc = new ZipFloClass();
string type = context.Request["type"].ToString();
switch (type)
{
case "rc": type = "常规"; break;
case "ic": type = "工控"; break;
case "lp": type = "等保"; break;
}
string res_str = context.Request.Form["list"].ToString();
//string res_str = "2,4,6";
string[] data = res_str.Split(‘,‘);
for (int i = 0; i < data.Length; i++)
{
string doc_path = context.Server.MapPath("~/ProjectMgt/Doc") + "\\" + data[i].Trim() + "\\" + type;
string zip_path = context.Server.MapPath("~/ProjectMgt/Doc/zip/zip") + "\\" + data[i].Trim() + ".zip";
if (Directory.Exists(doc_path))
{
zc.ZipFile(doc_path, zip_path);
}
}
string zip_Path = context.Server.MapPath("~/ProjectMgt/Doc/zip/zip");
string zip_Name = context.Server.MapPath("~/ProjectMgt/Doc/zip/打包数据.zip");
if (File.Exists(zip_Name))
{
File.Delete(zip_Name);
}
zc.ZipFile(zip_Path, zip_Name);
string[] paths = Directory.GetFiles(zip_Path);
for (int n = 0; n < paths.Length; n++)
{
File.Delete(paths[n]);
}
context.Response.Write("{success:true, files:‘生成文件成功‘}");
#region
//List<string> downloadurl = new List<string>();
//ExtFacade ef = new ExtFacade();
//for (int i = 0; i < data.Length; i++) {
// string query = string.Format(@"select top 1 t.LoadUrl from
// tbl_Net_SecurityCheck t
// where t.OUID in(
// select t.OUID from tbl_Base_OUInfo t where substring (OUCode,0,21)in
// (
// select m.OUCode from tbl_Base_OUInfo m
// where m.OUID=‘{0}‘)
// )
// and t.DocType=‘{1}‘ order by t.SubmitTime desc", data[i],type);
// DataTable dt = ef.GetBySQLText(query);
// downloadurl.Add(dt.Rows[0]["LoadUrl"].ToString());
//}
#endregion
}
}
private void OunamesFilesToFiles(string[] OUNAMES)
{
for (int i = 0; i < OUNAMES.Length; i++)
{
var dt= GetContentByOuname(OUNAMES[i]);
DataTableToFiles(dt, OUNAMES[i]);
}
}
private void DataTableToFiles(DataTable dt,string OUName)
{
string LoadUrl = HttpContext.Current.Server.MapPath("~/ProjectMgt/Doc2017") + "\\" + OUName;
if (Directory.Exists(LoadUrl))
{
Directory.Delete(LoadUrl, true);
}
Directory.CreateDirectory(LoadUrl);
for (int i=0;i<dt.Rows.Count;i++)
{
ToFile(dt.Rows[i]["OUName"].ToString(), (byte[])dt.Rows[i]["Content"], dt.Rows[i]["DownLoadFileName"].ToString());
}
}
private void ToFile(string OUName, byte[] Content, string DownLoadFileName)
{
string LoadUrl = HttpContext.Current.Server.MapPath("~/ProjectMgt/Doc2017") + "\\" + OUName + "\\"+ DownLoadFileName;
MemoryStream m = new MemoryStream(Content);
FileStream fs = new FileStream(LoadUrl, FileMode.OpenOrCreate);
m.WriteTo(fs);
m.Close();
fs.Close();
m = null;
fs = null;
}
/// <summary>
/// 压缩文件类
/// </summary>
public class ZipFloClass
{
/// <summary>
/// 压缩方法
/// </summary>
/// <param name="strFile"></param>
/// <param name="strZip"></param>
public void ZipFile(string strFile, string strZip)
{
if (strFile[strFile.Length - 1] != Path.DirectorySeparatorChar)
strFile += Path.DirectorySeparatorChar;
ZipOutputStream s = new ZipOutputStream(File.Create(strZip));
s.SetLevel(6); // 0 - store only to 9 - means best compression
zip(strFile, s, strFile);
s.Finish();
s.Close();
}
/// <summary>
/// 压缩
/// </summary>
/// <param name="strFile"></param>
/// <param name="s"></param>
/// <param name="staticFile"></param>
private void zip(string strFile, ZipOutputStream s, string staticFile)
{
if (strFile[strFile.Length - 1] != Path.DirectorySeparatorChar) strFile += Path.DirectorySeparatorChar;
Crc32 crc = new Crc32();
string[] filenames = Directory.GetFileSystemEntries(strFile);
foreach (string file in filenames)
{
if (Directory.Exists(file))
{
zip(file, s, staticFile);
}
else // 否则直接压缩文件
{
//打开压缩文件
FileStream fs = File.OpenRead(file);
byte[] buffer = new byte[fs.Length];
fs.Read(buffer, 0, buffer.Length);
string tempfile = file.Substring(staticFile.LastIndexOf("\\") + 1);
ZipEntry entry = new ZipEntry(tempfile);
entry.DateTime = DateTime.Now;
entry.Size = fs.Length;
fs.Close();
crc.Reset();
crc.Update(buffer);
entry.Crc = crc.Value;
s.PutNextEntry(entry);
s.Write(buffer, 0, buffer.Length);
}
}
}
}
private void DownLoad2017(HttpContext context)
{
string zip_Path = context.Server.MapPath("~/ProjectMgt/Doc2017/zip/zip");
string zip_Name = context.Server.MapPath("~/ProjectMgt/Doc2017/zip/打包数据.zip");
//zip_Name = context.Server.MapPath("~/ProjectMgt/Doc/安徽销售公司/常规/2016年网络安全检查-常规安全-准备阶段-安徽销售公司.xls");
FileStream fs = new FileStream(zip_Name, FileMode.Open);
byte[] bytes = new byte[(int)fs.Length];
fs.Read(bytes, 0, bytes.Length);
fs.Close();
context.Response.ContentType = "application/octet-stream";
//通知浏览器下载文件而不是打开
context.Response.AddHeader("Content-Disposition", "attachment; filename=" + HttpUtility.UrlEncode("打包数据.zip", System.Text.Encoding.UTF8));
context.Response.BinaryWrite(bytes);
context.Response.Flush();
File.Delete(zip_Name);
context.Response.End();
}
js代码：
Ext.Ajax.request({
url: ‘Ashx/NetCheckViewAll.ashx?flag=DownLoad2017‘,
method: ‘post‘,
async:false,
params: {
list: Ids
},
success: function (response, opts) {
//var url = ‘Ashx/NetCheckViewAll.ashx?flag=downzip‘;
//window.open(url);
Ext.Msg.confirm("下载", "确定要下载选中项吗？", function (button) {
if (button == "yes") {
var url = ‘Ashx/NetCheckViewAll.ashx?flag=downzip2017‘;
window.open(url);
}
});
}
//failure: function (response, opts) {
// console.log(‘server-side failure with status code ‘ + response.status);
//}
});
原文地址：https://www.cnblogs.com/liuqiyun/p/9405619.html
时间： 2024-08-01 18:27:18