关于iphone http上传请求协议的一些总结

转载于：http://blog.sina.com.cn/s/blog_661314940100m648.html

最近坐了一个项目涉及到图片上传的问题，起初用到socket，但是由于比较陌生
改而用 http 协议做web上传
这里需要自定义http协议
 

http协议应该注意四点：
 1.初始化响应服务器地址
NSURL *url = [NSURL URLWithString:@"http://xxx.xxx.xx.xxx/mqupload.jsp"];
[urlRequest setValue:  [NSString stringWithFormat:@"%@\r\n", @"http://XXXXXX  HTTP/1.1"]]; //可要可无
 2.设置提交方法 GET／POST
[urlRequest setHTTPMethod:@"POST"];
 3.设置响应内容类型

 [urlRequest setValue:  [NSString stringWithFormat:@"multipart/form-data;    boundary=---------%@", @"7daaba1e0368"] forHTTPHeaderField:@"Content-Type"];
 4.设置响应内容
   NSMutableData *postData = [NSMutableData dataWithCapacity:[m_imageData length]];
    [postData appendData: [[NSString stringWithFormat:@"---------%@\r\n", @"7daaba1e0368"]
                          dataUsingEncoding:NSUTF8StringEncoding]];//开始标志
   
    [postData appendData: [[NSString stringWithFormat: @"Content-Disposition:form-data; name="File1";        filename="1.jpg"\r\n Content-type: image/pjpeg\r\n\r\n"]dataUsingEncoding:NSUTF8StringEncoding]];//name是页面文件的参数，type是文件类型
    [postData appendData:imageData];// 文件数据
    [postData appendData: [[NSString stringWithFormat:@"\r\n---------%@--\r\n",  @"7daaba1e0368"]
                          dataUsingEncoding:NSUTF8StringEncoding]];// 文件结束标志
   [urlRequest setHTTPBody:postData];//把数据加载到响应的文件体

＊＊＊只要做到以上几点，一个完整的http协议就做好了
下面附一个简洁版完整的请求协议体
   NSURL *url = [NSURL URLWithString:@"http://XX.XX.XX"];//请求服务器路径。
   m_imageData = UIImagePNGRepresentation(myImageView.image);
   NSMutableURLRequest *urlRequest = [NSMutableURLRequest requestWithURL:url];
   [urlRequest setHTTPMethod:@"POST"];
   [urlRequest setValue: [NSString stringWithFormat:@"multipart/form-data; boundary=---------%@",                          @"7daaba1e0368"] forHTTPHeaderField:@"Content-Type"];
   [urlRequest setValue: [NSString stringWithFormat:@"%@\r\n\r\n",

             @" keep-alive"] forHTTPHeaderField:@"Connection"];
   NSMutableData *postData = [NSMutableData dataWithCapacity:[m_imageData length]];
   [postData appendData: [[NSString stringWithFormat:@"---------%@\r\n",

             @"7daaba1e0368"] dataUsingEncoding:NSUTF8StringEncoding]];
   
   [postData appendData: [[NSString stringWithFormat:
                    @"Content-Disposition:form-data; name="File1"; filename="1.jpg"\r\n Content-type:    image/pjpeg\r\n\r\n"]dataUsingEncoding:NSUTF8StringEncoding]];
   [postData appendData:m_imageData];
   [postData appendData: [[NSString stringWithFormat:@"\r\n---------%@--\r\n", @"7daaba1e0368"]
                   dataUsingEncoding:NSUTF8StringEncoding]];
   [urlRequest setHTTPBody:postData];
   NSURLConnection *theConnection = [[NSURLConnection alloc] initWithRequest:urlRequest delegate:self];

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