方法里包括了图片大小限制、图片尺寸、文件内容等等的判断。。。
该案例是mvc下的demo，支持单张图片上传。
代码如下
publicActionResult Upload()
{
stringimgurl ="";
foreach(stringkeyinRequest.Files)
{
//这里只测试上传第一张图片file[0]
HttpPostedFileBase file0 = Request.Files[key];
//转换成byte,读取图片MIME类型
Stream stream;
intsize = file0.ContentLength / 1024;//文件大小KB
if(size > 1024)
{
returnContent(ReturnMsg(Enum_Return.失败,"图片不能超过1M：",null));
}
byte[] fileByte =newbyte[2];//contentLength，这里我们只读取文件长度的前两位用于判断就好了，这样速度比较快，剩下的也用不到。
stream = file0.InputStream;
stream.Read(fileByte, 0, 2);//contentLength，还是取前两位
//获取图片宽和高
//System.Drawing.Image image = System.Drawing.Image.FromStream(stream);
//int width = image.Width;
//int height = image.Height;
stringfileFlag ="";
if(fileByte !=null&& fileByte.Length > 0)//图片数据是否为空
{
fileFlag = fileByte[0].ToString() fileByte[1].ToString();
}
string[] fileTypeStr = {"255216","7173","6677","13780"};//对应的图片格式jpg,gif,bmp,png
if(fileTypeStr.Contains(fileFlag))
{
stringaction = Request["action"];
stringpath ="/uploads/";
switch(action)
{
case"headimage":
path ="headimage/";
break;
case"blogtype":
path ="blogtype/";
break;
}
stringfullpath = path UserInfo.userID "/";
if(!Directory.Exists(Server.MapPath(fullpath)))
{
Directory.CreateDirectory(Server.MapPath(fullpath));
}
Request.Files[key].SaveAs(Server.MapPath(fullpath Request.Files[key].FileName));
imgurl = fullpath Request.Files[key].FileName;
}
else
{
returnContent(ReturnMsg(Enum_Return.失败,"图片格式不正确："fileFlag,null));
}
stream.Close();
}
returnContent(ReturnMsg(Enum_Return.成功,"上传成功", imgurl));
}
一般处理程序
代码如下
publicvoidProcessRequest(HttpContext context)
{
context.Response.ContentType ="application/json";
HttpPostedFile _upfile = context.Request.Files["File"];
if(_upfile.ContentLength < 500000)
{
if(string.IsNullOrEmpty(_upfile.FileName))
{
context.Response.Write("请上传图片");
}
stringfileFullname = _upfile.FileName;
stringdataName = DateTime.Now.ToString("yyyyMMddhhmmss");
stringfileName = fileFullname.Substring(fileFullname.LastIndexOf("\\") 1);
stringtype = fileFullname.Substring(fileFullname.LastIndexOf(".") 1);
if(type =="bmp"|| type =="jpg"|| type =="gif"|| type =="JPG"|| type =="BMP"|| type =="GIF")
{
_upfile.SaveAs(HttpContext.Current.Server.MapPath("photo") "\\" dataName "." type);
HttpCookie cookie =newHttpCookie("photo");
context.Response.Write("上传成功");
}
else
{
context.Response.Write("支持格式：|jpg|gif|bmp|");
}
}
else
{
context.Response.Write("你的图片已经超过500K的大小！");
}
}
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