iOS开发中以application/json上传文件实例详解

NSString *accessUrl = [NSString stringWithFormat:@"%@/xxx",@"https://www.xxxxx.com:xxxx"];
 NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:[NSURL URLWithString:accessUrl]];
 request.HTTPMethod = @"POST";
 //设置请求头
 [request setValue:@"application/json" forHTTPHeaderField:@"Content-Type"];
 //设置请求体
 NSMutableData *body = [NSMutableData data];
 [body appendData:[jsonStr dataUsingEncoding:NSUTF8StringEncoding]];
 [request setHTTPBody:body];
 NSHTTPURLResponse* urlResponse = nil;
 NSError *error = [[NSError alloc] init];
 NSData *responseData = [NSURLConnection sendSynchronousRequest:request returningResponse:&urlResponse error:&error];
 NSString *result = [[NSString alloc] initWithData:responseData encoding:NSUTF8StringEncoding];
 if (result == nil) {
  NSLog(@"json解析失败!");
 }
 else
 {
  NSData *jsonData = [result dataUsingEncoding:NSUTF8StringEncoding];
  NSError *err;
  NSDictionary *dic = [NSJSONSerialization JSONObjectWithData:jsonData
               options:NSJSONReadingMutableContainers
                error:&err];
  if(err) {
   NSLog(@"json解析失败：%@",err);
  }
  success(dic);
 }