.net上传，一个选择直接上传(ashx)和byteArray上传

最新推荐文章于 2021-02-26 19:11:25 发布

转载最新推荐文章于 2021-02-26 19:11:25 发布 · 66 阅读

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原文链接：http://www.cnblogs.com/CoderWayne/archive/2009/10/31/4485691.html

文章标签：

#c#

本文介绍了一种使用 ASP.NET 和 C# 实现图片上传的方法。该方法接收客户端上传的图片，并将其保存到指定的服务器目录下。同时，文章还提供了一个简单的页面用于演示如何直接从请求中获取输入流并保存为图片。

<%@ WebHandler Language="C#" Class="UploadImage" %>
using System;
using System.Web;
public class UploadImage : IHttpHandler
{
    //文件上传目录
    private string uploadFolder = "UploadImage";
    public void ProcessRequest(HttpContext context)
    {
        context.Response.ContentType = "text/plain";
        HttpFileCollection files = context.Request.Files;
        if (files.Count > 0)
        {
            string path = context.Server.MapPath(uploadFolder);
            HttpPostedFile file = files[0];
            if (file != null && file.ContentLength > 0)
            {
                string fileName = DateTime.Now.ToString("yyyyMMddhhmmss") + context.Request.Form["fileName"];
                string savePath = path + "/" + fileName;
                file.SaveAs(savePath);
                System.Web.HttpResponse obj = context.Response;
                obj.Write(fileName);
            }
        }
        else
        {
            context.Response.Write("参数错误");
            context.Response.End();
        }
    }
    
    public bool IsReusable {
        get {
            return false;
        }
    }
}

<%@ Page Language="C#" ContentType="text/html" ResponseEncoding="gb2312" Debug="true"%>
<%@ Import Namespace="System.IO" %>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312">
<title>上传</title>
</head>
<body>

<script language="c#" runat="server">
public void Page_Load(Object sender,EventArgs e)
{
  if (true)
        {
            string saveToFolder = "file";
            string Path = Server.MapPath(saveToFolder);
 
            //通过Resquest.InputStream解收的是Stream形式，转换成byte[]形式
            Stream s = Request.InputStream;
            byte[] bt = StreamToBytes(s);
 
            //将byte[]形式转换成MemoryStream形式，再保存为图片
            System.IO.MemoryStream ms = new System.IO.MemoryStream(bt);
            System.Drawing.Bitmap b = new System.Drawing.Bitmap(ms);
            b.Save(Path + "/proj.jpg");
            Response.Write(true);
            Response.End();
 
        }
        
}
    //此函数将Stream转换成byte[]
    public byte[] StreamToBytes(Stream stream)
    {
        byte[] bytes = new byte[stream.Length];
        stream.Read(bytes, 0, bytes.Length);
        // 设置当前流的位置为流的开始 
        stream.Seek(0, SeekOrigin.Begin);
        return bytes;
    }
</script>
</body>
</html>