iOS NSURLSession 9.0后代替NSURLConnection

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1 ios用于Data Task用于加载数据，使用shared session和dataTaskWithRequest:completionHandler:方法创建

NSURL *url =[NSURLURLWithString:@"http://www.baidu.com"];

NSURLRequest *request = [NSURLRequestrequestWithURL:url];

// NSOperationQueue *queue = [[NSOperationQueue alloc]init];

NSURLSession *session = [NSURLSessionsharedSession];

NSURLSessionDataTask *dataTask = [session dataTaskWithRequest:request

completionHandler:

^(NSData *data,NSURLResponse *response, NSError *error) {

NSString *data1 = [[NSStringalloc]initWithData:dataencoding:NSUTF8StringEncoding];

NSLog(@"%@服务器响应成功啦",data1);

[_webloadRequest:request];

// 输出返回的状态码，请求成功的话为200

// [self showResponseCode:response];

// 在webView中加载数据

// [self.web loadData:data

// MIMEType:@"text/html"

// textEncodingName:@"utf-8"

// baseURL:nil];

// 加载数据完毕，停止spinner

// [self.spinner stopAnimating];

}];

// 使用resume方法启动任务

[dataTask resume];

//2用于下载数据

NSURL *URL = [NSURL URLWithString:@"http://www.baidu.com"];

NSURLRequest *request = [NSURLRequest requestWithURL:URL];

NSData *data =data;//data来自网上的数据

NSURLSession *session = [NSURLSession sharedSession];

NSURLSessionUploadTask *uploadTask = [session uploadTaskWithRequest:request

fromData:data

completionHandler:

^(NSData *data,NSURLResponse *response, NSError *error) {

// ...

}];

[uploadTask resume];

3用于上传数据

NSURL *URL = [NSURLURLWithString:@"http://www.baidu.com"];

NSURLRequest *request = [NSURLRequest requestWithURL:URL];

NSData *data = data;//data来自网上的数据

NSURLSession *session = [NSURLSession sharedSession];

NSURLSessionUploadTask *uploadTask = [session uploadTaskWithRequest:request

fromData:data

completionHandler:

^(NSData *data,NSURLResponse *response, NSError *error) {

}];

[uploadTask resume];

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