两种方法：
后端的一般处理程序：Imge.ashx
1 using System; 2 using System.Collections.Generic; 3 using System.Linq; 4 using System.Web; 5 using System.Web.UI.WebControls; 6 7 namespace Test 8 { 9 /// <summary> 10 /// Imge 的摘要说明 11 /// </summary> 12 public class Imge : IHttpHandler 13 { 14 15 public void ProcessRequest(HttpContext context) 16 { 17 18 #region 方法一 19 System.IO.MemoryStream ms = new System.IO.MemoryStream(); 20 System.IO.Stream str = new FileUpload().PostedFile.InputStream; 21 System.Drawing.Bitmap map = new System.Drawing.Bitmap(str); 22 map.Save(ms, System.Drawing.Imaging.ImageFormat.Jpeg); 23 context.Response.ClearContent(); 24 context.Response.ContentType = "image/Jpeg"; 25 context.Response.BinaryWrite(ms.ToArray()); //将二进制字节输出到页面 26 #endregion 27 28 #region 方法二 29 System.IO.FileStream fs = new System.IO.FileStream("Filename", System.IO.FileMode.Open, System.IO.FileAccess.Read); 30 byte[] datas = new byte[fs.Length]; 31 fs.Read(datas, 0, Convert.ToInt32(fs.Length)); 32 fs.Close(); 33 context.Response.OutputStream.Write(datas, 0, Convert.ToInt32(fs.Length)); 34 context.Response.End(); 35 #endregion 36 } 37 38 public bool IsReusable 39 { 40 get 41 { 42 return false; 43 } 44 } 45 } 46 }
HTML页面代码：
1 <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> 2 <html xmlns="http://www.w3.org/1999/xhtml"> 3 <head> 4 <title></title> 5 </head> 6 <body> 7 <img src="/Imge.ashx" /> <!---图片的src指向Imge.ashx 就可以---> 8 </body> 9 </html>