MVC 保存图片
<%@ Page Language="C#" Inherits="System.Web.Mvc.ViewPage<dynamic>" %>
<!DOCTYPE html>
<html>
<head runat="server">
<meta name="viewport" content="width=device-width" />
<title>Index</title>
<script type="text/javascript">
function SaveAs() {
var imgURL = document.getElementById("image").src;
window.location.href = '/Home/SaveAs?url=' + imgURL;
}
</script>
</head>
<body>
<div>
<img id="image" src="../../Images/Koala.jpg" width="100px;" height="100px;" alt=""/><br />
<input onclick="SaveAs()" value="下载" type="button"/>
</div>
</body>
</html>
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Mvc;
using System.Net;
using System.IO;
namespace DownLoadPic.Controllers
{
public class HomeController : Controller
{
//
// GET: /Home/
public ActionResult Index()
{
return View();
}
public void SaveAs(string url)
{
WebClient my = new WebClient();
byte[] mybyte;
var len = url.Split(new char[] { '/' }).Length;
var image_name = url.Split(new char[] { '/' })[len - 1];
mybyte = my.DownloadData(url);
MemoryStream ms = new MemoryStream(mybyte);
System.Drawing.Image img;
img = System.Drawing.Image.FromStream(ms);
img.Save("C:\\Users\\DELL\\Downloads\\" + image_name + ""); //保存 Server.MapPath("/")
OpenorSaveEPPlus("C:\\Users\\DELL\\Downloads\\" + image_name, image_name);
/*服务器存一个，浏览器存一个*/
}
public void OpenorSaveEPPlus(string outFile, string fileName)
{
ContentResult vResult = new ContentResult();
FileInfo info = new FileInfo(outFile);
long size = 0;
if (info.Exists)
size = info.Length;
this.Response.AddHeader("content-type", "application/x-msdownload;");
this.Response.AddHeader("Content-Disposition", "attachment;filename=" + HttpUtility.UrlEncode(fileName));
this.Response.AddHeader("content-length", size.ToString());
this.Response.WriteFile(outFile, 0, size);
}
}
}
原文链接
从MSDN中我们可以得知，WebClient的作用就是“Provides common methods for sending data to and receiving data from a resource identified by a URI.”也就是说我们可以通过这个类去访问与获取网络上的资源文件。
WebClient提供四种将数据上载到资源的方法：
- OpenWrite 返回一个用于将数据发送到资源的 Stream。
- UploadData 将字节数组发送到资源并返回包含任何响应的字节数组。
- UploadFile 将本地文件发送到资源并返回包含任何响应的字节数组。
- UploadValues 将 NameValueCollection 发送到资源并返回包含任何响应的字节数组。
另外WebClient还提供三种从资源下载数据的方法：
- DownloadData 从资源下载数据并返回字节数组。
- DownloadFile 从资源将数据下载到本地文件。
- OpenRead 从资源以 Stream 的形式返回数据。
WebClient client = new WebClient();
//第一种
string URLAddress = @"http://files.cnblogs.com/x4646/tree.zip";
string receivePath=@"C:\";
client.DownloadFile(URLAddress, receivePath + System.IO.Path.GetFileName(URLAddress));
//就OK了。
//第二种
Stream str = client.OpenRead(URLAddress);
StreamReader reader = new StreamReader(str);
byte[] mbyte = new byte[1000000];
int allmybyte = (int)mbyte.Length;
int startmbyte = 0;
while (allmybyte > 0)
{
int m = str.Read(mbyte, startmbyte, allmybyte);
if (m == 0)
break;
startmbyte += m;
allmybyte -= m;
}
reader.Dispose();
str.Dispose();
string path = receivePath + System.IO.Path.GetFileName(URLAddress);
FileStream fstr = new FileStream(path, FileMode.OpenOrCreate, FileAccess.Write);
fstr.Write(mbyte, 0, startmbyte);
fstr.Flush();
fstr.Close();