IOS5开发http get/post调用mvc4 webapi互操作(图片上传)

目前最流行的跨平台交互是采用http协议通过JSON对象进行互操作。这种方式最简单，也很高效。webservice+xml的方式似乎已经过时。

下面是我做的一个例子

webapi的代码

 

public IEnumerable<Product> GetAllProducts()
        {
            Console.WriteLine(DateTime.Now.ToLongTimeString() + " : receive request.");
            return new List<Product> 
            {
                new Product() { Id = 1, Name = "Gizmo 1", Price = 1.99M },
                new Product() { Id = 2, Name = "Gizmo 2", Price = 2.99M },
                new Product() { Id = 3, Name = "Gizmo 3", Price = 3.99M },
                new Product() { Id = 4, Name = "TShirt 3", Price = 5.99M },
                new Product() { Id = 5, Name = "SOFT TSHIRT", Price = 34.99M },
            };
        }

        public Product GetProductById(int id)
        {
            if (id < 1 || id > 3)
            {
                throw new HttpResponseException(System.Net.HttpStatusCode.NotFound);
            }
            return new Product()
            {
                Id = id,
                Name = "Gizmo " + id.ToString(),
                Price = id + 0.99M
            };
        }
        // POST /api/Products
        public Product Post(Product p)
        {
            Console.WriteLine(string.Format("submit Name:{0},Price:{1}",p.Name,p.Price));
            return p;
        }
        
 // POST /api/Upload
        public string Post()
        {
            Console.WriteLine(DateTime.Now.ToLongTimeString() + " : receive upload request.");
            if (!Request.Content.IsMimeMultipartContent("form-data"))
           {
               throw new HttpResponseException(HttpStatusCode.UnsupportedMediaType);
            }
            MultipartFormDataStreamProvider streamProvider = new MultipartFormDataStreamProvider();

            // Read the MIME multipart content using the stream provider we just created.
            IEnumerable<HttpContent> bodyparts = Request.Content.ReadAsMultipartAsync(streamProvider).Result;

            // The submitter field is the entity with a Content-Disposition header field with a "name" parameter with value "submitter"
            //string submitter = "submitter";
            //if (!bodyparts.TryGetFormFieldValue("submitter", out submitter))
            //{
            //    submitter = "unknown";
            //}

            // Get a dictionary of local file names from stream provider.
            // The filename parameters provided in Content-Disposition header fields are the keys.
            // The local file names where the files are stored are the values.
            IDictionary<string, string> bodyPartFileNames = streamProvider.BodyPartFileNames;

            // Create response containing information about the stored files.
            return bodyPartFileNames.Select(kv =>
            {
              
                FileInfo fileinfo = new FileInfo(kv.Value);
                Console.WriteLine("receive file name:" + fileinfo.FullName + " Size:" + fileinfo.Length.ToString());
                return new FileResult
                {
                    FileName = kv.Key,
                   // LocalPath = fileinfo.FullName,
                   // LastModifiedTime = fileinfo.LastWriteTimeUtc,
                   // Length = fileinfo.Length,
                   // Submitter = submitter
                };
                
                //return FileResult;
            }).ToList()[0].FileName;

webapi 返回的IEnumerable<Product> 或 IQueryable<Product> 支持odata协议，odata协议功能很强大，查询很方便。可以关注。

第一个是通过http get/post获取服务端数据和更新服务端数据。

 

代码获取数据代码

- (IBAction)getAction:(id)sender {
    NSString *urlstring=self.urlTextField.text;
    NSURL *url=[NSURL URLWithString:urlstring];
    //NSData *jsondata=[[NSData alloc]initWithContentsOfURL:url];
    //NSLog(@"data:%@",[[NSString alloc] initWithData:jsondata encoding:NSUTF8StringEncoding]);
    NSMutableURLRequest *request=[NSMutableURLRequest requestWithURL:url];
    NSOperationQueue *queue=[[NSOperationQueue alloc] init];
    [NSURLConnection sendAsynchronousRequest:request queue:queue
                           completionHandler:^(NSURLResponse *respone,
                                               NSData *data,
                                               NSError *error)
     {
         if ([data length]>0 && error==nil) {
             NSString *jsonstring=[[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];
             //[self.respondTextView setText:jsonstring];
             NSLog(@"data:%@",jsonstring);
             //[self performSelectorOnMainThread:@selector(setRespondtext:)withObject:jsonstring waitUntilDone:YES modes:nil];
             [self performSelectorOnMainThread:@selector(setRespondtext:) withObject:data waitUntilDone:NO];
         }  
     }
     ];
    

}

post数据代码如下

- (IBAction)postAction:(id)sender {
    NSString *urlstring=self.urlTextField.text;
    NSString *poststr=self.requestTextView.text;
    
    NSURL *url=[NSURL URLWithString:urlstring];
    NSMutableURLRequest *request=[NSMutableURLRequest requestWithURL:url];
    [request addValue:@"application/json" forHTTPHeaderField:@"Content-Type"];
    [request setHTTPMethod:@"POST"];
    [request setHTTPBody:[poststr dataUsingEncoding:NSUTF8StringEncoding]];
    NSOperationQueue *queue=[[NSOperationQueue alloc] init];
    [NSURLConnection sendAsynchronousRequest:request queue:queue
                           completionHandler:^(NSURLResponse *respone,
                                               NSData *data,
                                               NSError *error)
     {
         if ([data length]>0 && error==nil) {
             NSString *jsonstring=[[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];
             //[self.respondTextView setText:jsonstring];
             NSLog(@"data:%@",jsonstring);
             //[self performSelectorOnMainThread:@selector(setRespondtext:)withObject:jsonstring waitUntilDone:YES modes:nil];
             [self performSelectorOnMainThread:@selector(setRespondtext:) withObject:data waitUntilDone:NO];
         }  
     }
     ];    
    
    

}

 解析获取的JSON字符串

-(void) setRespondtext:(NSData *)data{
    NSString *text=[[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];
    id jsonObject=[NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingAllowFragments error:nil];
    if (jsonObject !=nil) {
        NSLog(@"Successfully deserialized...");
        if ([jsonObject isKindOfClass:[NSDictionary class]]) {
            NSDictionary *deserializedDic=(NSDictionary *)jsonObject;
            NSLog(@"Dersialized Json dictionary =%@",deserializedDic);
        }
        else if([jsonObject isKindOfClass:[NSArray class]]){
            NSArray *deserializedArray=(NSArray *)jsonObject;
            NSLog(@"Derialized json array = %@",deserializedArray);
            for (NSDictionary *item in deserializedArray) {
                NSLog(@"Id : %@ Name: %@ Price : %@",[item objectForKey:@"Id"],[item objectForKey:@"Name"],[item objectForKey:@"Price"]);
            }
        }else{
            
        }
    }
    
    
    [self.respondTextView setText:text];

} 

图片上传的代码

- (IBAction)uploadAction:(id)sender {
    NSString *urlstring=self.urlTextField.text;
    //NSString *poststr=@"";
    NSData *imgData=UIImageJPEGRepresentation(self.previewImageView.image, 0.9f);
    
    NSString *boundary = @"0xKhTmLbOuNdArY";  
    NSString *contentType = [NSString stringWithFormat:@"multipart/form-data; boundary=%@", boundary, nil];
    
    NSURL *url=[NSURL URLWithString:urlstring];
    NSMutableURLRequest *request=[NSMutableURLRequest requestWithURL:url];
    [request addValue:contentType forHTTPHeaderField:@"Content-Type"];
    [request setHTTPMethod:@"POST"];
    NSMutableData *body = [NSMutableData data];
    [body appendData:[[NSString stringWithFormat:@"\r\n--%@\r\n", boundary] dataUsingEncoding:NSUTF8StringEncoding]];
    [body appendData:[[NSString stringWithString:@"Content-Disposition: form-data; name=\"userfile\"; filename=\"iphonefile.jpg\"\r\n"] dataUsingEncoding:NSUTF8StringEncoding]];
    [body appendData:[[NSString stringWithString:@"Content-Type: application/octet-stream\r\n\r\n"] dataUsingEncoding:NSUTF8StringEncoding]];
    [body appendData:[NSData dataWithData:imgData]];
    [body appendData:[[NSString stringWithFormat:@"\r\n--%@--\r\n", boundary] dataUsingEncoding:NSUTF8StringEncoding]];
    
    [request setHTTPBody:body];
    NSOperationQueue *queue=[[NSOperationQueue alloc] init];
    [NSURLConnection sendAsynchronousRequest:request queue:queue
                           completionHandler:^(NSURLResponse *respone,
                                               NSData *data,
                                               NSError *error)
     {
         if ([data length]>0 && error==nil) {
             NSString *jsonstring=[[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];
             //[self.respondTextView setText:jsonstring];
             NSLog(@"data:%@",jsonstring);
             //[self performSelectorOnMainThread:@selector(setRespondtext:)withObject:jsonstring waitUntilDone:YES modes:nil];
             //[self performSelectorOnMainThread:@selector(setRespondtext:) withObject:data waitUntilDone:NO];
         }  
     }
     ];    

}

我感觉使用ios sdk自带的NSMutableURLRequest,NSURLConnection, NSJSONSerialization,也非常方便，似乎没有必要去使用第三方的类库。