NSURLsessionTask

#import "ViewController.h"

@interface ViewController ()

@property(nonatomic,weak) IBOutlet UIImageView* imageView;

@end


@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.
    self.imageView.backgroundColor = [UIColor grayColor];
}

-(IBAction)sessionTask:(id)sender{
    
    NSString* urlStr1 = @"http://iappfree.candou.com:8080/free/applications/limited?currency=rmb&page=3";
    NSString* urlStr2 = @"http://photo.candou.com/i/114/826ea823e8ffe792a6fda9e126f6c404";
    
    //进行dataTask 的任务
//    [self downloadWithDataTask:urlStr1];
    
    //进行downloadTask 的任务
    [self downloadWithDownloadTask:urlStr2];

    //上传UploadTask任务
//    [self uploadWithUploadTask:urlStr1];
    
}
/**
     根据职能不同Task有三种子类：
     NSURLSessionUploadTask：上传用的Task，传完以后不会再下载返回结果；
     NSURLSessionDownloadTask：下载用的Task,下载内容到硬盘上；
     NSURLSessionDataTask：可以上传内容，上传完成后再进行下载,存储为NSData格式。
 */
#pragma mark -三种Task任务的基本演示-

//可以上传内容，上传完成后再进行下载,存储为NSData格式
-(void)downloadWithDataTask:(NSString*)urlStr{
    
    NSURL *url = [NSURL URLWithString:urlStr];
    
    NSURLRequest *request = [NSURLRequest requestWithURL:url];
    //使用一个系统默认的会话（缓存策略、cookie、鉴权等使用默认）
    NSURLSession *session = [NSURLSession sharedSession];
    //接受数据类的任务
    NSURLSessionDataTask *dataTask = [session dataTaskWithRequest:request completionHandler:^(NSData *data, NSURLResponse *response, NSError *error) {
        NSLog(@"data:%@",data);
        NSLog(@"response:%@",response);
        NSLog(@"error:%@",error);
    }];
    //执行任务
    [dataTask resume];
}

//下载用的Task,下载内容到硬盘上
-(void)downloadWithDownloadTask:(NSString*)urlStr{
    
    NSURL *url = [NSURL URLWithString:urlStr];
    
//    NSURLRequest *request = [NSURLRequest requestWithURL:url cachePolicy:NSURLRequestReturnCacheDataElseLoad timeoutInterval:10];
    NSURLRequest *request = [NSURLRequest requestWithURL:url];
    //使用一个系统默认的会话（缓存策略、cookie、鉴权等使用默认）
    NSURLSession *session = [NSURLSession sharedSession];
    //下载类的任务
    NSURLSessionDownloadTask *downloadTask = [session downloadTaskWithRequest:request completionHandler:^(NSURL *location, NSURLResponse *response, NSError *error) {
        
        NSLog(@"location:%@",location);
        NSLog(@"response:%@",response);
        NSLog(@"error:%@",error);
        
        NSData *data = [NSData dataWithContentsOfURL:location];
//        self.imageView.image = [UIImage imageWithData:data];
        
        //获取Document目录
        NSString *documentPath = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES)  firstObject];
        //将字符串路径转换成URL
        NSURL *documentUrl = [NSURL fileURLWithPath:documentPath];
        //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
        NSURL *newUrl = [documentUrl URLByAppendingPathComponent:[location lastPathComponent]];
        
        NSLog(@"newUrl:%@",newUrl);
        //将返给路径的文件夹移动到新的路径下
        [[NSFileManager defaultManager] moveItemAtURL:location toURL:newUrl error:nil];
    }];
    //执行任务
    [downloadTask resume];
}

//上传用的Task，传完以后不会再下载返回结果
-(void)uploadWithUploadTask:(NSString*)urlStr{
    
    NSURL *url = [NSURL URLWithString:urlStr];
    
    NSURLRequest *request = [NSURLRequest requestWithURL:url];
    NSData *data = nil;
    
    //使用一个系统默认的会话（缓存策略、cookie、鉴权等使用默认）
    NSURLSession *session = [NSURLSession sharedSession];
    //上传类的任务
    NSURLSessionUploadTask *uploadTask = [session uploadTaskWithRequest:request fromData:data completionHandler:^(NSData *data, NSURLResponse *response, NSError *error) {
        NSLog(@"data%@",data);
        NSLog(@"response%@",response);
        NSLog(@"error%@",error);
    }];
    //执行任务
    [uploadTask resume];
}



- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

@end