如何在服务器上动态上传图片？

在我的应用程序中，我想将图像上传到服务器。

In my application i want to upload the images to server.

我可以在服务器上传图像，但在filename =前面提到图像的名称％@。JPG。图像保持不变

I am able to upload images on server but the name of the image mention in front of filename=%@.jpg. remains the same for images

[body appendData:[[NSString stringWithString:@"Content-Disposition: form-data; name=\"userfile\"; filename=\"%@.jpg\"\r\n"] dataUsingEncoding:NSUTF8StringEncoding]];

但我想将图像保存在服务器上，其图像名称相同..... 。
plz帮帮我。

but i want to save the image on server with the same image name it has...... plz help me out.

以下是我的代码：

    -(IBAction)upload:(id)sender
{

    //imageview is a UIImageView 
    NSData *imageData = UIImageJPEGRepresentation(imageView.image, 100);


    // setting up the URL to post to
    NSString *urlString = @"http://url.com/upload/uploader.php?";

    // setting up the request object now

    NSMutableURLRequest *request = [[[NSMutableURLRequest alloc] init] autorelease];
    [request setURL:[NSURL URLWithString:urlString]];
    [request setHTTPMethod:@"POST"];

    /*
     add some header info now
     we always need a boundary when we post a file
     also we need to set the content type

     You might want to generate a random boundary.. this is just the same 
     as my output from wireshark on a valid html post
     */
    NSString *boundary = [NSString stringWithString:@"---------------------------14737809831466499882746641449"];
    NSString *contentType = [NSString stringWithFormat:@"multipart/form-data; boundary=%@",boundary];
    [request addValue:contentType forHTTPHeaderField: @"Content-Type"];

    /*
     now lets create the body of the post
     */

    NSMutableData *body = [NSMutableData data];
    [body appendData:[[NSString stringWithFormat:@"\r\n--%@\r\n",boundary] dataUsingEncoding:NSUTF8StringEncoding]];    

    [body appendData:[[NSString stringWithString:@"Content-Disposition: form-data; name=\"userfile\"; filename=\"%@.jpg\"\r\n"] dataUsingEncoding:NSUTF8StringEncoding]];
    [body appendData:[[NSString stringWithString:@"Content-Type: application/octet-stream\r\n\r\n"] dataUsingEncoding:NSUTF8StringEncoding]];
    [body appendData:[NSData dataWithData:imageData]];
    [body appendData:[[NSString stringWithFormat:@"\r\n--%@--\r\n",boundary] dataUsingEncoding:NSUTF8StringEncoding]];
    // setting the body of the post to the reqeust
    [request setHTTPBody:body];

    // now lets make the connection to the web

    NSData *returnData = [NSURLConnection sendSynchronousRequest:request returningResponse:nil error:nil];
    ///self.returnString = [[NSString alloc] initWithData:returnData encoding:NSUTF8StringEncoding];
    NSString *returnString = [[NSString alloc] initWithData:returnData encoding:NSUTF8StringEncoding];

    NSLog(@"%@",returnString);


}