iOS POST请求

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用post请求向服务器发送一个json格式的URL；用post向服务器发送数据切记是以表单的形式向服务器发送数据 get则是在url后面追加字符串，拼接字符串；

post格式的URL：

NSString * Pass = [_passWord.textstringByAppendingString:_radString];

NSString * strMD2=[[MyMD5md5:Pass] uppercaseString];

NSString * postString = [NSStringstringWithFormat:@"param={\"Email\":\"%@\",\"RealName\":\"%@\",\"Pwd\":\"%@\",\"Rad\":\"%@\"}",_emailText.text,_userName.text,strMD2,_radString];

NSLog(@"------%@-------",postString);

//往服务器上传要转成ASCII

NSData * postData = [postStringdataUsingEncoding:NSASCIIStringEncodingallowLossyConversion:YES];

NSMutableURLRequest * request = [[NSMutableURLRequestalloc]init];

[request setURL:[NSURLURLWithString:@"http://192.168.0.140:91/App/Login/Reg"]];

[request setCachePolicy:NSURLRequestUseProtocolCachePolicy];

[requestsetTimeoutInterval:20.0f];

[requestsetHTTPMethod:@"POST"];

[requestsetHTTPBody:postData];

//application/x-www-form-urlencoded告诉服务器是一个表单提交数据放式

[request setValue:@"application/x-www-form-urlencoded"forHTTPHeaderField:@"Content-Type"];

//得到提交数据的长度

NSString * len = [NSStringstringWithFormat:@"%d",[postDatalength]];

//添加一个http包头告诉服务器数据长度是多少

[request setValue:lenforHTTPHeaderField:@"Content-Length"];

[NSURLConnectionconnectionWithRequest:request delegate:self];

#pragma mark --

#pragma mark -- NSMutableRequestDelegate

-(void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response

{

_buffer = [[NSMutableDataalloc]init];

}

-(void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data

{

[_bufferappendData:data];

}

-(void)connectionDidFinishLoading:(NSURLConnection *)connection

{

NSString * info = [[NSStringalloc]initWithData:_bufferencoding:NSASCIIStringEncoding];

NSLog(@"-----info--%@------",info);

}

-(void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error

{

NSLog(@"-----错误提示--%@--",[errorlocalizedDescription]);

}

打印返回数据成功

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