[TwistedFate]NSURLSession

//所有类型的task都要调用resume方法才会开始请求

(IBAction)BlockButton:(id)sender {

//快捷方式获得session对象

NSURLSession *session = [NSURLSession sharedSession];

NSURL *url = [NSURL URLWithString:@”http://mobile.ximalaya.com/m/explore_album_list?category_name=all&condition=hot&device=android&page=1&per_page=20&status=0&tag_name=%E5%8D%81%E4%BA%8C%E6%98%9F%E5%BA%A7“];

//通过URL初始化task 在block内部可以直接对返回的数据进行处理

NSURLSessionTask *task = [session dataTaskWithURL:url completionHandler:^(NSData *data, NSURLResponse *response, NSError *error) {

NSLog(@"-----%@",[NSJSONSerialization JSONObjectWithData:data options:kNilOptions error:nil]);
NSString *result = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];
NSLog(@"result = %@",result);

}];

//启动任务

[task resume];

}

//NSURLSessionDataDelegate代理方法

//NSURLSession提供了block方式处理返回数据的简便方式,但如果想要在接收数据过程中做进一步的处理,仍然可以调用相关的协议方法.NSURLSession的代理方法和NSURLConnection有些类似,都是分为接收响应、接收数据、请求完成几个阶段.

(IBAction)DelegateButton:(id)sender {

//使用代理方法我们需要设置代理,但是session得delegate属性是只读的,要想设置代理只能通过这种方式创建session

NSURLSession *session = [NSURLSession sessionWithConfiguration:[NSURLSessionConfiguration defaultSessionConfiguration] delegate:self delegateQueue:[[NSOperationQueue alloc] init]];

//创建任务(因为要使用代理方法,就不需要block方式初始化)

NSURLSessionDataTask *task = [session dataTaskWithRequest:[NSURLRequest requestWithURL:[NSURL URLWithString:@”http://ipad-bjwb.bjd.com.cn/DigitalPublication/publish/Handler/APINewsList.ashx?date=20131129&startRecord=1&len=15&udid=1234567890&terminalType=Iphone&cid=213“]]];

//启动任务

[task resume];

}

//代理方法:

//1.接收服务器响应

-(void)URLSession:(NSURLSession )session dataTask:(NSURLSessionDataTask )dataTask didReceiveResponse:(NSURLResponse *)response completionHandler:(void (^)(NSURLSessionResponseDisposition))completionHandler

{

//允许处理服务器的响应,才会继续接收服务器返回的数据,NSURLSession在接收到响应的时候要先对响应做允许处理:completionHandler(NSURLSessionResponseAllow);,才会继续接收服务器返回的数据,进入后面的代理方法

completionHandler(NSURLSessionResponseAllow);

//当网络请求是基于http协议时(url以http开头),response本质就是NSHTTPURLResponse类型的

NSHTTPURLResponse httpResponse = (NSHTTPURLResponse )response;

NSLog(@”status code = %ld”,httpResponse.statusCode);

NSLog(@”all header fields = %@”,httpResponse.allHeaderFields);

//创建空的可变的data,准备接收服务器传回的data片段

self.receiveData = [NSMutableData dataWithCapacity:40];

}

//2.接收服务器的数据(可能调用多次)

-(void)URLSession:(NSURLSession )session dataTask:(NSURLSessionDataTask )dataTask didReceiveData:(NSData *)data

{

//处理每次接收的数据

//将每次接收到得data片段,拼接到receiveData中

[_receiveData appendData:data];

}

//3.请求成功或者失败(如果失败 error有值)

-(void)URLSession:(NSURLSession )session task:(NSURLSessionTask )task didCompleteWithError:(NSError *)error

{

//请求完成,成功或者失败的处理

NSString *result = [[NSString alloc] initWithData:_receiveData encoding:NSUTF8StringEncoding];

NSLog(@”result = %@”,result);

}

(IBAction)GetButton:(id)sender {

}

//POST和GET的区别就在于request,所以使用session的POST请求和GET过程是一样的,区别就在于对request的处理.

- (IBAction)PostButton:(id)sender {

NSURL *url= [NSURL URLWithString:@"http://ipad-bjwb.bjd.com.cn/DigitalPublication/publish/Handler/APINewsList.ashx?date=20131129&startRecord=1&len=15&udid=1234567890&terminalType=Iphone&cid=213"];
NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url];
request.HTTPMethod = @"POST";
request.HTTPBody = [@"username=daka&pwd=123" dataUsingEncoding:NSUTF8StringEncoding];
NSURLSession *session = [NSURLSession sharedSession];
//由于要先对request先进行处理,我们通过request初始化task
NSURLSessionTask *task = [session dataTaskWithRequest:request completionHandler:^(NSData *data, NSURLResponse *response, NSError *error) {
NSLog(@"%@",[NSJSONSerialization JSONObjectWithData:data options:kNilOptions error:nil]);
NSString *result = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];
NSLog(@"result = %@",result);
}];
//启动任务
[task resume];

}