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。