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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