NSURLsessionTask

  1 #import "ViewController.h"
  2
  3 @interface ViewController ()
  4
  5 @property(nonatomic,weak) IBOutlet UIImageView* imageView;
  6
  7 @end
  8
  9
 10 @implementation ViewController
 11
 12 - (void)viewDidLoad {
 13     [super viewDidLoad];
 14     // Do any additional setup after loading the view, typically from a nib.
 15     self.imageView.backgroundColor = [UIColor grayColor];
 16 }
 17
 18 -(IBAction)sessionTask:(id)sender{
 19
 20     NSString* urlStr1 = @"http://iappfree.candou.com:8080/free/applications/limited?currency=rmb&page=3";
 21     NSString* urlStr2 = @"http://photo.candou.com/i/114/826ea823e8ffe792a6fda9e126f6c404";
 22
 23     //进行dataTask 的任务
 24 //    [self downloadWithDataTask:urlStr1];
 25
 26     //进行downloadTask 的任务
 27     [self downloadWithDownloadTask:urlStr2];
 28
 29     //上传UploadTask任务
 30 //    [self uploadWithUploadTask:urlStr1];
 31
 32 }
 33 /**
 34      根据职能不同Task有三种子类：
 35      NSURLSessionUploadTask：上传用的Task，传完以后不会再下载返回结果；
 36      NSURLSessionDownloadTask：下载用的Task,下载内容到硬盘上；
 37      NSURLSessionDataTask：可以上传内容，上传完成后再进行下载,存储为NSData格式。
 38  */
 39 #pragma mark -三种Task任务的基本演示-
 40
 41 //可以上传内容，上传完成后再进行下载,存储为NSData格式
 42 -(void)downloadWithDataTask:(NSString*)urlStr{
 43
 44     NSURL *url = [NSURL URLWithString:urlStr];
 45
 46     NSURLRequest *request = [NSURLRequest requestWithURL:url];
 47     //使用一个系统默认的会话（缓存策略、cookie、鉴权等使用默认）
 48     NSURLSession *session = [NSURLSession sharedSession];
 49     //接受数据类的任务
 50     NSURLSessionDataTask *dataTask = [session dataTaskWithRequest:request completionHandler:^(NSData *data, NSURLResponse *response, NSError *error) {
 51         NSLog(@"data:%@",data);
 52         NSLog(@"response:%@",response);
 53         NSLog(@"error:%@",error);
 54     }];
 55     //执行任务
 56     [dataTask resume];
 57 }
 58
 59 //下载用的Task,下载内容到硬盘上
 60 -(void)downloadWithDownloadTask:(NSString*)urlStr{
 61
 62     NSURL *url = [NSURL URLWithString:urlStr];
 63
 64 //    NSURLRequest *request = [NSURLRequest requestWithURL:url cachePolicy:NSURLRequestReturnCacheDataElseLoad timeoutInterval:10];
 65     NSURLRequest *request = [NSURLRequest requestWithURL:url];
 66     //使用一个系统默认的会话（缓存策略、cookie、鉴权等使用默认）
 67     NSURLSession *session = [NSURLSession sharedSession];
 68     //下载类的任务
 69     NSURLSessionDownloadTask *downloadTask = [session downloadTaskWithRequest:request completionHandler:^(NSURL *location, NSURLResponse *response, NSError *error) {
 70
 71         NSLog(@"location:%@",location);
 72         NSLog(@"response:%@",response);
 73         NSLog(@"error:%@",error);
 74
 75         NSData *data = [NSData dataWithContentsOfURL:location];
 76 //        self.imageView.image = [UIImage imageWithData:data];
 77
 78         //获取Document目录
 79         NSString *documentPath = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES)  firstObject];
 80         //将字符串路径转换成URL
 81         NSURL *documentUrl = [NSURL fileURLWithPath:documentPath];
 82         //更改路径，把最后的文件追加到自己设定的路径后，组成新的路径
 83         NSURL *newUrl = [documentUrl URLByAppendingPathComponent:[location lastPathComponent]];
 84
 85         NSLog(@"newUrl:%@",newUrl);
 86         //将返给路径的文件夹移动到新的路径下
 87         [[NSFileManager defaultManager] moveItemAtURL:location toURL:newUrl error:nil];
 88     }];
 89     //执行任务
 90     [downloadTask resume];
 91 }
 92
 93 //上传用的Task，传完以后不会再下载返回结果
 94 -(void)uploadWithUploadTask:(NSString*)urlStr{
 95
 96     NSURL *url = [NSURL URLWithString:urlStr];
 97
 98     NSURLRequest *request = [NSURLRequest requestWithURL:url];
 99     NSData *data = nil;
100
101     //使用一个系统默认的会话（缓存策略、cookie、鉴权等使用默认）
102     NSURLSession *session = [NSURLSession sharedSession];
103     //上传类的任务
104     NSURLSessionUploadTask *uploadTask = [session uploadTaskWithRequest:request fromData:data completionHandler:^(NSData *data, NSURLResponse *response, NSError *error) {
105         NSLog(@"data%@",data);
106         NSLog(@"response%@",response);
107         NSLog(@"error%@",error);
108     }];
109     //执行任务
110     [uploadTask resume];
111 }
112
113
114
115 - (void)didReceiveMemoryWarning {
116     [super didReceiveMemoryWarning];
117     // Dispose of any resources that can be recreated.
118 }
119
120 @end