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NSURLSession详解
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导语现在NSURLConnection在开发中会使用的越来越少，iOS9已经将NSURLConnection废弃，现在最低版本一般适配iOS7，所以也可以使用。
- NSURLConnection相对于NSURLSession,安全性低。NSURLConnection下载有峰值，比较麻烦处理。
- 尽管适配最低版本iOS7，也可以使用NSURLSession。AFN已经不支持NSURLConnection。
- NSURLSession：默认是挂起状态，如果要请求网络，需要开启。
现在NSURLConnection在开发中会使用的越来越少，iOS9已经将NSURLConnection废弃，现在最低版本一般适配iOS7，所以也可以使用。
[NSURLSession sharedSession] 获取全局的NSURLSession对象。在iPhone的所有app共用一个全局session.
NSURLSessionUploadTask -> NSURLSessionDataTask -> NSURLSessionTask
NSURLSessionDownloadTask -> NSURLSessionTask
NSURLSessionDownloadTask下载，默认下载到tmp文件夹。下载完成后删除临时文件。所以我们要在删除文件之前，将它移动到Cache里。
NSURLSession详解NSURLSession基础
- NSURLSession代理
- NSURLSession大文件下载
- NSURLSession断点续传
1.NSURLSession基础
- 第一种网络请求方法
//创建URL
NSURL * url = [NSURL URLWithString:@"http://192.168.1.200/login.php?username=haha&password=123"];
//创建请求
// NSURLRequest * request = [NSURLRequest requestWithURL:url];
//创建Session
NSURLSession * session = [NSURLSession sharedSession];
//创建任务
NSURLSessionDataTask * task = [session dataTaskWithURL:url completionHandler:^(NSData * _Nullable data, NSURLResponse * _Nullable response, NSError * _Nullable error) {
NSLog(@"%@",[[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding]);
}];
//开启网络任务
[task resume];
- 第二种网络请求方法
//创建URL
NSURL * url = [NSURL URLWithString:@"http://192.168.1.200/login.php?username=haha&password=123"];
//创建请求
NSURLRequest * request = [NSURLRequest requestWithURL:url];
//创建Session
NSURLSession * session = [NSURLSession sharedSession];
//创建任务
NSURLSessionDataTask * task = [session dataTaskWithRequest:request completionHandler:^(NSData * _Nullable data, NSURLResponse * _Nullable response, NSError * _Nullable error) {
NSLog(@"%@",[[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding]); }];
//开启网络任务
[task resume];
- POST请求
NSURL * url = [NSURL URLWithString:@"http://192.168.1.200/login.php"]; NSMutableURLRequest * request = [NSMutableURLRequest requestWithURL:url]; //设置请求方法
request.HTTPMethod = @"POST"; //设置请求体
request.HTTPBody = [@"username=haha&password=123" dataUsingEncoding:NSUTF8StringEncoding]; [[[NSURLSession sharedSession] dataTaskWithRequest:request completionHandler:^(NSData * _Nullable data, NSURLResponse * _Nullable response, NSError * _Nullable error) { NSLog(@"%@",[[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding]); }] resume];
- 下载文件
NSURL * url = [NSURL URLWithString:[@"http://192.168.1.200/DOM解析.mp4" stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding]]; NSURLSession * session = [NSURLSession sharedSession]; NSURLSessionDownloadTask * downloadTask = [session downloadTaskWithURL:url completionHandler:^(NSURL * _Nullable location, NSURLResponse * _Nullable response, NSError * _Nullable error) { //location 下载到沙盒的地址
NSLog(@"下载完成%@",location); //response.suggestedFilename 响应信息中的资源文件名
NSString * cachesPath = [[NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES) lastObject] stringByAppendingPathComponent:response.suggestedFilename]; NSLog(@"缓存地址%@",cachesPath); //获取文件管理器
NSFileManager * mgr = [NSFileManager defaultManager];
//将临时文件移动到缓存目录下
//[NSURL fileURLWithPath:cachesPath] 将本地路径转化为URL类型
//URL如果地址不正确，生成的url对象为空 [mgr moveItemAtURL:location toURL:[NSURL fileURLWithPath:cachesPath] error:NULL]; }]; [downloadTask resume];
2.NSURLSession代理
- (void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event { // 全局session
// NSURLSession * session = [NSURLSession sharedSession];
//创建自定义session
//NSURLSessionConfiguration 的 配置
//[[NSOperationQueue alloc] init] 也可以写成 nil NSURL * url = [NSURL URLWithString:@"http://192.168.1.200/login.php?username=haha&password=123"]; NSURLSession * session = [NSURLSession sessionWithConfiguration:[NSURLSessionConfiguration defaultSessionConfiguration] delegate:self delegateQueue:[[NSOperationQueue alloc] init]]; NSURLSessionDataTask * task = [session dataTaskWithURL:url]; [task resume];}//接收到服务器响应- (void)URLSession:(NSURLSession *)session dataTask:(NSURLSessionDataTask *)dataTask
didReceiveResponse:(NSURLResponse *)response
completionHandler:(void (^)(NSURLSessionResponseDisposition disposition))completionHandler { NSLog(@"%s",__FUNCTION__); //允许接受服务器回传数据
completionHandler(NSURLSessionResponseAllow);
}//接收服务器回传的数据,有可能执行多次
- (void)URLSession:(NSURLSession *)session dataTask:(NSURLSessionDataTask *)dataTask
didReceiveData:(NSData *)data { NSLog(@"%@",[[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding]);
}//请求成功或失败
- (void)URLSession:(NSURLSession *)session task:(NSURLSessionTask *)task didCompleteWithError:(NSError *)error { NSLog(@"%@",error);
}
3.NSURLSession大文件下载
#import "ViewController.h"@interface ViewController ()<NSURLSessionDownloadDelegate>@end@implementation ViewController- (void)viewDidLoad {
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib. NSLog(@"%@",NSSearchPathForDirectoriesInDomains(, , ));
}- (void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event { NSURLSession * session = [NSURLSession sessionWithConfiguration:[NSURLSessionConfiguration defaultSessionConfiguration] delegate:self delegateQueue:[[NSOperationQueue alloc] init]]; NSURLSessionDownloadTask * task = [session downloadTaskWithURL:[NSURL URLWithString:[@"http://192.168.1.200/DOM解析.mp4"stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding]]]; [task resume];}/* 监测临时文件下载的数据大小，当每次写入临时文件时，就会调用一次 bytesWritten 单次写入多少
totalBytesWritten 已经写入了多少
totalBytesExpectedToWrite 文件总大小 */- (void)URLSession:(NSURLSession *)session downloadTask:(NSURLSessionDownloadTask *)downloadTask
didWriteData:(int64_t)bytesWritten
totalBytesWritten:(int64_t)totalBytesWritten
totalBytesExpectedToWrite:(int64_t)totalBytesExpectedToWrite { //打印下载百分比
NSLog(@"%f",totalBytesWritten * 1.0 / totalBytesExpectedToWrite);}//下载完成- (void)URLSession:(NSURLSession *)session downloadTask:(NSURLSessionDownloadTask *)downloadTask
didFinishDownloadingToURL:(NSURL *)location { NSString * cachesPath = [[NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES) lastObject] stringByAppendingPathComponent:downloadTask.response.suggestedFilename]; NSFileManager * mgr = [NSFileManager defaultManager]; [mgr moveItemAtURL:location toURL:[NSURL fileURLWithPath:cachesPath] error:NULL];}- (void)URLSession:(NSURLSession *)session task:(NSURLSessionTask *)task didCompleteWithError:(NSError *)error { NSLog(@"%@",error);
}
4.NSURLSession断点续传
#import "ViewController.h"@interface ViewController ()<NSURLSessionDownloadDelegate>@property (nonatomic, strong) NSURLSessionDownloadTask * task;@property (nonatomic, strong) NSData * resumeData;@property (nonatomic, strong) NSURLSession * session;@end@implementation ViewController//故事板中开始按钮的响应方法
- (IBAction)start:(id)sender { NSURLSession * session = [NSURLSession sessionWithConfiguration:[NSURLSessionConfiguration defaultSessionConfiguration] delegate:self delegateQueue:[[NSOperationQueue alloc] init]]; self.session = session; self.task = [session downloadTaskWithURL:[NSURL URLWithString:[@"http://192.168.1.68/丁香花.mp3"stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding]]]; [self.task resume];
}//故事板中暂停按钮的响应方法
- (IBAction)pause:(id)sender { //暂停就是将任务挂起 [self.task cancelByProducingResumeData:^(NSData *resumeData) {
//保存已下载的数据 self.resumeData = resumeData;
}];
}
//继续按钮的响应方法
- (IBAction)resume:(id)sender { //可以使用ResumeData创建任务 self.task = [self.session downloadTaskWithResumeData:self.resumeData]; //开启继续下载
[self.task resume];}- (void)viewDidLoad {
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib. NSLog(@"%@",NSSearchPathForDirectoriesInDomains(, , ));
}/* 监测临时文件下载的数据大小，当每次写入临时文件时，就会调用一次 bytesWritten 单次写入多少
totalBytesWritten 已经写入了多少
totalBytesExpectedToWrite 文件总大小 */- (void)URLSession:(NSURLSession *)session downloadTask:(NSURLSessionDownloadTask *)downloadTask
didWriteData:(int64_t)bytesWritten
totalBytesWritten:(int64_t)totalBytesWritten
totalBytesExpectedToWrite:(int64_t)totalBytesExpectedToWrite { //打印下载百分比
NSLog(@"%f",totalBytesWritten * 1.0 / totalBytesExpectedToWrite);}//下载完成- (void)URLSession:(NSURLSession *)session downloadTask:(NSURLSessionDownloadTask *)downloadTask
didFinishDownloadingToURL:(NSURL *)location { NSString * cachesPath = [[NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES) lastObject] stringByAppendingPathComponent:downloadTask.response.suggestedFilename]; NSFileManager * mgr = [NSFileManager defaultManager]; [mgr moveItemAtURL:location toURL:[NSURL fileURLWithPath:cachesPath] error:NULL];}- (void)URLSession:(NSURLSession *)session task:(NSURLSessionTask *)task didCompleteWithError:(NSError *)error { NSLog(@"%@",error);
}
NSURLSession基础
//创建URL
NSURL * url = [NSURL URLWithString:@"http://192.168.1.200/login.php?username=haha&password=123"];
//创建请求
// NSURLRequest * request = [NSURLRequest requestWithURL:url];
//创建Session
NSURLSession * session = [NSURLSession sharedSession];
//创建任务
NSURLSessionDataTask * task = [session dataTaskWithURL:url completionHandler:^(NSData * _Nullable data, NSURLResponse * _Nullable response, NSError * _Nullable error) {
NSLog(@"%@",[[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding]);
}];
//开启网络任务
[task resume];
//创建URL
NSURL * url = [NSURL URLWithString:@"http://192.168.1.200/login.php?username=haha&password=123"];
//创建请求
NSURLRequest * request = [NSURLRequest requestWithURL:url];
//创建Session
NSURLSession * session = [NSURLSession sharedSession];
//创建任务
NSURLSessionDataTask * task = [session dataTaskWithRequest:request completionHandler:^(NSData * _Nullable data, NSURLResponse * _Nullable response, NSError * _Nullable error) {
NSLog(@"%@",[[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding]); }];
//开启网络任务
[task resume];
NSURL * url = [NSURL URLWithString:@"http://192.168.1.200/login.php"]; NSMutableURLRequest * request = [NSMutableURLRequest requestWithURL:url]; //设置请求方法
request.HTTPMethod = @"POST"; //设置请求体
request.HTTPBody = [@"username=haha&password=123" dataUsingEncoding:NSUTF8StringEncoding]; [[[NSURLSession sharedSession] dataTaskWithRequest:request completionHandler:^(NSData * _Nullable data, NSURLResponse * _Nullable response, NSError * _Nullable error) { NSLog(@"%@",[[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding]); }] resume];
NSURL * url = [NSURL URLWithString:[@"http://192.168.1.200/DOM解析.mp4" stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding]]; NSURLSession * session = [NSURLSession sharedSession]; NSURLSessionDownloadTask * downloadTask = [session downloadTaskWithURL:url completionHandler:^(NSURL * _Nullable location, NSURLResponse * _Nullable response, NSError * _Nullable error) { //location 下载到沙盒的地址
NSLog(@"下载完成%@",location); //response.suggestedFilename 响应信息中的资源文件名
NSString * cachesPath = [[NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES) lastObject] stringByAppendingPathComponent:response.suggestedFilename]; NSLog(@"缓存地址%@",cachesPath); //获取文件管理器
NSFileManager * mgr = [NSFileManager defaultManager];
//将临时文件移动到缓存目录下
//[NSURL fileURLWithPath:cachesPath] 将本地路径转化为URL类型
//URL如果地址不正确，生成的url对象为空 [mgr moveItemAtURL:location toURL:[NSURL fileURLWithPath:cachesPath] error:NULL]; }]; [downloadTask resume];
- (void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event { // 全局session
// NSURLSession * session = [NSURLSession sharedSession];
//创建自定义session
//NSURLSessionConfiguration 的 配置
//[[NSOperationQueue alloc] init] 也可以写成 nil NSURL * url = [NSURL URLWithString:@"http://192.168.1.200/login.php?username=haha&password=123"]; NSURLSession * session = [NSURLSession sessionWithConfiguration:[NSURLSessionConfiguration defaultSessionConfiguration] delegate:self delegateQueue:[[NSOperationQueue alloc] init]]; NSURLSessionDataTask * task = [session dataTaskWithURL:url]; [task resume];}//接收到服务器响应- (void)URLSession:(NSURLSession *)session dataTask:(NSURLSessionDataTask *)dataTask
didReceiveResponse:(NSURLResponse *)response
completionHandler:(void (^)(NSURLSessionResponseDisposition disposition))completionHandler { NSLog(@"%s",__FUNCTION__); //允许接受服务器回传数据
completionHandler(NSURLSessionResponseAllow);
}//接收服务器回传的数据,有可能执行多次
- (void)URLSession:(NSURLSession *)session dataTask:(NSURLSessionDataTask *)dataTask
didReceiveData:(NSData *)data { NSLog(@"%@",[[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding]);
}//请求成功或失败
- (void)URLSession:(NSURLSession *)session task:(NSURLSessionTask *)task didCompleteWithError:(NSError *)error { NSLog(@"%@",error);
}
#import "ViewController.h"@interface ViewController ()<NSURLSessionDownloadDelegate>@end@implementation ViewController- (void)viewDidLoad {
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib. NSLog(@"%@",NSSearchPathForDirectoriesInDomains(, , ));
}- (void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event { NSURLSession * session = [NSURLSession sessionWithConfiguration:[NSURLSessionConfiguration defaultSessionConfiguration] delegate:self delegateQueue:[[NSOperationQueue alloc] init]]; NSURLSessionDownloadTask * task = [session downloadTaskWithURL:[NSURL URLWithString:[@"http://192.168.1.200/DOM解析.mp4"stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding]]]; [task resume];}/* 监测临时文件下载的数据大小，当每次写入临时文件时，就会调用一次 bytesWritten 单次写入多少
totalBytesWritten 已经写入了多少
totalBytesExpectedToWrite 文件总大小 */- (void)URLSession:(NSURLSession *)session downloadTask:(NSURLSessionDownloadTask *)downloadTask
didWriteData:(int64_t)bytesWritten
totalBytesWritten:(int64_t)totalBytesWritten
totalBytesExpectedToWrite:(int64_t)totalBytesExpectedToWrite { //打印下载百分比
NSLog(@"%f",totalBytesWritten * 1.0 / totalBytesExpectedToWrite);}//下载完成- (void)URLSession:(NSURLSession *)session downloadTask:(NSURLSessionDownloadTask *)downloadTask
didFinishDownloadingToURL:(NSURL *)location { NSString * cachesPath = [[NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES) lastObject] stringByAppendingPathComponent:downloadTask.response.suggestedFilename]; NSFileManager * mgr = [NSFileManager defaultManager]; [mgr moveItemAtURL:location toURL:[NSURL fileURLWithPath:cachesPath] error:NULL];}- (void)URLSession:(NSURLSession *)session task:(NSURLSessionTask *)task didCompleteWithError:(NSError *)error { NSLog(@"%@",error);
}
#import "ViewController.h"@interface ViewController ()<NSURLSessionDownloadDelegate>@property (nonatomic, strong) NSURLSessionDownloadTask * task;@property (nonatomic, strong) NSData * resumeData;@property (nonatomic, strong) NSURLSession * session;@end@implementation ViewController//故事板中开始按钮的响应方法
- (IBAction)start:(id)sender { NSURLSession * session = [NSURLSession sessionWithConfiguration:[NSURLSessionConfiguration defaultSessionConfiguration] delegate:self delegateQueue:[[NSOperationQueue alloc] init]]; self.session = session; self.task = [session downloadTaskWithURL:[NSURL URLWithString:[@"http://192.168.1.68/丁香花.mp3"stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding]]]; [self.task resume];
}//故事板中暂停按钮的响应方法
- (IBAction)pause:(id)sender { //暂停就是将任务挂起 [self.task cancelByProducingResumeData:^(NSData *resumeData) {
//保存已下载的数据 self.resumeData = resumeData;
}];
}
//继续按钮的响应方法
- (IBAction)resume:(id)sender { //可以使用ResumeData创建任务 self.task = [self.session downloadTaskWithResumeData:self.resumeData]; //开启继续下载
[self.task resume];}- (void)viewDidLoad {
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib. NSLog(@"%@",NSSearchPathForDirectoriesInDomains(, , ));
}/* 监测临时文件下载的数据大小，当每次写入临时文件时，就会调用一次 bytesWritten 单次写入多少
totalBytesWritten 已经写入了多少
totalBytesExpectedToWrite 文件总大小 */- (void)URLSession:(NSURLSession *)session downloadTask:(NSURLSessionDownloadTask *)downloadTask
didWriteData:(int64_t)bytesWritten
totalBytesWritten:(int64_t)totalBytesWritten
totalBytesExpectedToWrite:(int64_t)totalBytesExpectedToWrite { //打印下载百分比
NSLog(@"%f",totalBytesWritten * 1.0 / totalBytesExpectedToWrite);}//下载完成- (void)URLSession:(NSURLSession *)session downloadTask:(NSURLSessionDownloadTask *)downloadTask
didFinishDownloadingToURL:(NSURL *)location { NSString * cachesPath = [[NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES) lastObject] stringByAppendingPathComponent:downloadTask.response.suggestedFilename]; NSFileManager * mgr = [NSFileManager defaultManager]; [mgr moveItemAtURL:location toURL:[NSURL fileURLWithPath:cachesPath] error:NULL];}- (void)URLSession:(NSURLSession *)session task:(NSURLSessionTask *)task didCompleteWithError:(NSError *)error { NSLog(@"%@",error);
}
