NSMutableURLRequest 上传图片

- (void)postImage:(UIImage *)_image

 {

     //分界线的标识符

     NSString *TWITTERFON_FORM_BOUNDARY = @"AaB03x";

     NSMutableURLRequest * request = [NSMutableURLRequest requestWithURL:BaseURL(@"http://api.gaokao.715083.com/open/djs/uploadimg.do") cachePolicy:NSURLRequestReloadIgnoringLocalCacheData timeoutInterval:10];

     //分界线 --AaB03x

     NSString *MPboundary=[[NSString alloc]initWithFormat:@"--%@",TWITTERFON_FORM_BOUNDARY];

     //结束符 AaB03x--

     NSString *endMPboundary=[[NSString alloc]initWithFormat:@"%@--",MPboundary];

     //要上传的图片

     UIImage *image= _image;

     //得到图片的data

     NSData* data = UIImageJPEGRepresentation(image, 0.5);

     //http body的字符串

     NSMutableString *body=[[NSMutableString alloc]init];

     //参数的集合的所有key的集合

     NSDictionary *param = @{};

     NSArray *keys = [param allKeys];

     //遍历keys

     for(int i=0;i<[keys count];i++)

     {

         //得到当前key

         NSString *key=[keys objectAtIndex:i];

         //如果key不是pic，说明value是字符类型，比如name：Boris

         if(![key isEqualToString:@"pic"])

         {

             //添加分界线，换行

             [body appendFormat:@"%@\r\n",MPboundary];

             //添加字段名称，换2行

             [body appendFormat:@"Content-Disposition: form-data; name=\"%@\"\r\n\r\n",key];

             //添加字段的值

             [body appendFormat:@"%@\r\n",[param objectForKey:key]];

         }

     }

     ////添加分界线，换行

     [body appendFormat:@"%@\r\n",MPboundary];

     //声明pic字段，文件名为boris.png

     [body appendFormat:@"Content-Disposition: form-data; name=\"pic\"; filename=\"boris.png\"\r\n"];

     //声明上传文件的格式

     [body appendFormat:@"Content-Type: image/png\r\n\r\n"];

     //声明结束符：--AaB03x--

     NSString *end=[[NSString alloc]initWithFormat:@"\r\n%@",endMPboundary];

     //声明myRequestData，用来放入http body

     NSMutableData *myRequestData=[NSMutableData data];

     //将body字符串转化为UTF8格式的二进制

     [myRequestData appendData:[body dataUsingEncoding:NSUTF8StringEncoding]];

     //将image的data加入

     [myRequestData appendData:data];

     //加入结束符--AaB03x--

     [myRequestData appendData:[end dataUsingEncoding:NSUTF8StringEncoding]];

     //设置HTTPHeader中Content-Type的值

     NSString *content=[[NSString alloc]initWithFormat:@"multipart/form-data; boundary=%@",TWITTERFON_FORM_BOUNDARY];

     //设置HTTPHeader

     [request setValue:content forHTTPHeaderField:@"Content-Type"];

     //设置Content-Length

     [request setValue:[NSString stringWithFormat:@"%d", [myRequestData length]] forHTTPHeaderField:@"Content-Length"];

     //设置http body

     [request setHTTPBody:myRequestData];

     //http method

     [request setHTTPMethod:@"POST"];

     //建立连接，设置代理

     [NSURLConnection sendAsynchronousRequest:request queue:[NSOperationQueue mainQueue] completionHandler:^(NSURLResponse *response, NSData *data, NSError *connectionError) {

         if (connectionError) {

         }else{

              NSDictionary *dic = [NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingMutableContainers error:nil];

             NSString * string = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];

             NSLog(@"上传成功%@  %@  %@",response,string,dic);

         }

     }];

 }