需求:java
支持文件批量下載。如今有不少小圖片須要批量下載,不但願在服務器打包下載。chrome
支持大文件斷點下載。好比下載10G的文件。json
PC端全平臺支持。Windows,macOS,Linux瀏覽器
全瀏覽器支持。ie6,ie7,ie8,ie9,ie10,ie11,edge,firefox,chrome,safari服務器
支持文件夾結構下載。不但願在服務器打包,而是直接下載文件夾,下載後在本地文件夾結構和服務器保持一致。數據結構
支持從URL中下載文件。app
支持JSON數據結構。wordpress
方案:url
1、首先讀取文件夾下的文件,可能同時存在多個文件spa
2、選中文件,而後點擊下載,同時能夠選擇多個文件。
思路:經過生產壓縮包的形式進行下載,而後再清楚壓縮包,這樣用戶能夠一次性所有下載下來。
1、獲取目錄下的全部文件,而後綁定到checkboxlist中 ,代碼以下:
批量下載多個文件
$("#btn-down-files").click(function (){
if(downer.Config["Folder"]==""){ downer.open_folder();return;}
var urls =[
{ fileUrl:"http://res2.ncmem.com/res/images/ie11.png"}
,{ fileUrl:"http://res2.ncmem.com/res/images/up6.1/down.png"}
,{ fileUrl:"http://res2.ncmem.com/res/images/firefox.png"}
,{ fileUrl:"http://res2.ncmem.com/res/images/edge.png"}
,{ fileUrl:"http://res2.ncmem.com/res/images/up6.1/cloud.png"}
,{ fileUrl:"http://res2.ncmem.com/res/images/home/w.png"}
,{ fileUrl:"http://res2.ncmem.com/res/images/img.png"}
];
downer.app.addUrls(urls);
});
自定義JSON數據下載
$("#btn-down-json").click(function () {
if (downer.Config["Folder"] == "") { downer.open_folder(); return; }
var fd = {
nameLoc: "圖片列表"
, files: [
{ fileUrl: "http://res2.ncmem.com/res/images/ie11.png" }
, { fileUrl: "http://res2.ncmem.com/res/images/up6.1/down.png" }
, { fileUrl: "http://res2.ncmem.com/res/images/firefox.png" }
, { fileUrl: "http://res2.ncmem.com/res/images/edge.png" }
, { fileUrl: "http://res2.ncmem.com/res/images/up6.1/cloud.png" }
, { fileUrl: "http://res2.ncmem.com/res/images/home/w.png" }
, { fileUrl: "http://res2.ncmem.com/res/images/img.png" }
]
};
downer.app.addJson(fd);
});
服務端代碼:
protected void Btn_down_Click(object sender, EventArgs e)
{
if (ckl_ck.Items.Count > 0)
{
List<string> listFJ = new List<string>();//保存附件路徑
List<string> listFJName = new List<string>();//保存附件名字
for (int i = 0; i < ckl_ck.Items.Count; i++)
{
if (ckl_ck.Items[i].Selected)
{
listFJ.Add(Server.MapPath("Resource/Help/") + ckl_ck.Items[i].Text);
listFJName.Add(ckl_ck.Items[i].Text);
}
}
string time = DateTime.Now.Ticks.ToString();
ZipFileMain(listFJ.ToArray(), listFJName.ToArray(), Server.MapPath("Resource/Help/" + time + ".zip"), 9);//壓縮文件
DownloadFile(Server.UrlEncode("附件.zip"), Server.MapPath("Resource/Help/" + time + ".zip"));//下載文件 }
}
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();
File.Delete(filePath);//刪除已下載文件 Response.End();
}
/// <summary>
///壓縮文件
///</summary>
/// <param name="fileName">要壓縮的全部文件(徹底路徑)</param>
/// <param name="fileName">文件名稱</param>
/// <param name="name">壓縮後文件路徑</param>
/// <param name="Level">壓縮級別</param>
public void ZipFileMain(string[] filenames, string[] fileName, string name, int Level)
{
ZipOutputStream s = new ZipOutputStream(File.Create(name));
Crc32 crc = new Crc32();
//壓縮級別
s.SetLevel(Level); // 0 - store only to 9 - means best compression
try
{
int m = 0;
foreach (string file in filenames)
{
//打開壓縮文件
FileStream fs = File.OpenRead(file);//文件地址
byte[] buffer = new byte[fs.Length];
fs.Read(buffer, 0, buffer.Length);
//創建壓縮實體
ZipEntry entry = new ZipEntry(fileName[m].ToString());//原文件名
//時間
entry.DateTime = DateTime.Now;
//空間大小
entry.Size = fs.Length;
fs.Close();
crc.Reset();
crc.Update(buffer);
entry.Crc = crc.Value;
s.PutNextEntry(entry);
s.Write(buffer, 0, buffer.Length);
m++;
}
}
catch
{
throw;
}
finally
{
s.Finish();
s.Close();
}
}
3、系統中須要引用的dll http://blog.ncmem.com/wordpress/2019/08/28/java批量下載/ 須要下載。
4、運行效果如圖: