概括:HTTP请求可以使用NSURLConnection、NSURLSession、AFN、ASI等方式实现,其中又包括了get、post两种请求方式和同步、异步两种程序执行方式。
NSURLConnection
1 get方式的同步请求
/** * get同步请求 */ -(void) getSynch{ // 获取URL NSURL *url = [[NSURL alloc] initWithString:@"http://localhost:8070/MJServer/login?username=123&password=123"]; // 获取request请求 NSURLRequest *request = [NSURLRequest requestWithURL:url]; // 发送同步请求 NSData *data = [NSURLConnection sendSynchronousRequest:request returningResponse:nil error:nil]; // 将data转换成string NSString *result = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding]; NSLog(@"data -- %@", result); } |
2 get方式的异步请求
/** * get异步请求 */ -(void) getAsynch{ // 获取URL NSURL *url = [[NSURL alloc] initWithString:@"http://localhost:8070/MJServer/video"]; // 获取request请求 NSURLRequest *request = [NSURLRequest requestWithURL:url]; // 发送同步请求 [NSURLConnection sendAsynchronousRequest:request queue:[NSOperationQueue mainQueue] completionHandler:^(NSURLResponse *response, NSData *data, NSError *connectionError) { // 将data数据转成字典 NSDictionary *dict = [NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingAllowFragments error:nil]; NSLog(@"data -- %@", dict); }]; } |
3 post同步请求
/** * post同步请求 */ -(void) postSynch{ // 获取URL NSURL *url = [[NSURL alloc] initWithString:@"http://localhost:8070/MJServer"]; // 设置post请求需要使用NSMutableURLRequest NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url]; // 设置请求方式为post (必选) request.HTTPMethod = @"POST"; // 发送同步请求 NSData *data = [NSURLConnection sendSynchronousRequest:request returningResponse:nil error:nil]; // 将data转换成string NSString *result = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding]; NSLog(@"data -- %@", result); } |
4 post异步请求
/** * post异步请求 */ -(void) postAsynch{ // 获取URL NSURL *url = [[NSURL alloc] initWithString:@"http://localhost:8070/MJServer/login"]; // 获取request请求 NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url]; // 设置请求方式为post request.HTTPMethod = @"POST"; // 设置表单参数 (可选) NSString *params = [NSString stringWithFormat:@"username=123&pwd=123"]; request.HTTPBody = [params dataUsingEncoding:NSUTF8StringEncoding]; // 设置超时(可选) request.timeoutInterval = 5; // 设置请求头信息(可选) [request setValue:@"iPhone 6" forHTTPHeaderField:@"User-Agent"]; // 设置post请求需要使用NSMutableURLRequest [NSURLConnection sendAsynchronousRequest:request queue:[NSOperationQueue mainQueue] completionHandler:^(NSURLResponse *response, NSData *data, NSError *connectionError) { // 将data数据转成字典 NSDictionary *dict = [NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingAllowFragments error:nil]; NSLog(@"data -- %@", dict); }]; } |
NSURLSession
1 session的get请求
/** * session的get请求 */ -(void) sessionGet{ // 获取一个session实例 NSURLSession *session = [NSURLSession sharedSession]; // 获取url NSURL *url = [[NSURL alloc] initWithString:@"http://localhost:8070/MJServer/video"]; // 创建一个数据访问任务 NSURLSessionDataTask *task = [session dataTaskWithURL:url completionHandler:^(NSData *data, NSURLResponse *response, NSError *error) { NSLog(@"data -- %@", [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding]); }]; // 启动任务,开始、回复都用resume [task resume]; } |
2 session的post请求
/** * session的post请求 */ -(void) sessionPost{ // 获取一个session实例 NSURLSession *session = [NSURLSession sharedSession]; // 获取url NSURL *url = [[NSURL alloc] initWithString:@"http://localhost:8070/MJServer/login"]; // 获取request请求对象 NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url]; // 设置请求方式 request.HTTPMethod = @"POST"; // 设置请求体, NSString *params = @"username=123&pwd=123"; request.HTTPBody = [params dataUsingEncoding:NSUTF8StringEncoding]; // 创建一个数据访问任务 NSURLSessionDataTask *task = [session dataTaskWithRequest:request completionHandler:^(NSData *data, NSURLResponse *response, NSError *error) { NSLog(@"data -- %@", [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding]); }]; // 开始任务 [task resume]; } |
AFNetwork框架,需要导入#import "AFNetworking.h"
1 AFN的get请求
#import "AFNetworking.h"
/** * afn的get请求 */ -(void) afnGet{ // 创建一个请求操作管理者 AFHTTPRequestOperationManager *manager = [AFHTTPRequestOperationManager manager]; // 声明响应结果不进行json、xml等格式解析,直接返回data manager.responseSerializer = [AFHTTPResponseSerializer serializer]; // 设置请求参数(可选) NSMutableDictionary *params = [NSMutableDictionary dictionary]; params[@"username"] = @"123"; params[@"pwd"] = @"123"; // 发送get请求 NSString *url = @"http://localhost:8070/MJServer/login"; [manager GET:url parameters:params success:^(AFHTTPRequestOperation *operation, id responseObject) { // 请求成功在这里处理 // 将响应数据转换成字典 NSDictionary *dict = [NSJSONSerialization JSONObjectWithData:responseObject options:NSJSONReadingAllowFragments error:nil]; NSLog(@"%@", dict); } failure:^(AFHTTPRequestOperation *operation, NSError *error) { // 如果请求失败在这里处理 NSLog(@"request fail"); }]; } |
2 AFN的post请求
/** * afn的post请求 */ -(void) afnPost{ // 创建一个请求操作管理者 AFHTTPRequestOperationManager *manager = [AFHTTPRequestOperationManager manager]; // 声明响应结果不进行json、xml等格式解析,直接返回data manager.responseSerializer = [AFHTTPResponseSerializer serializer]; // 设置请求参数(可选) NSMutableDictionary *params = [NSMutableDictionary dictionary]; params[@"username"] = @"123"; params[@"pwd"] = @"123"; // 发送get请求 NSString *url = @"http://localhost:8070/MJServer/login"; [manager POST:url parameters:params success:^(AFHTTPRequestOperation *operation, id responseObject) { // 请求成功在这里处理 // 将响应数据转换成字典 NSDictionary *dict = [NSJSONSerialization JSONObjectWithData:responseObject options:NSJSONReadingAllowFragments error:nil]; NSLog(@"%@", dict); } failure:^(AFHTTPRequestOperation *operation, NSError *error) { // 如果请求失败在这里处理 NSLog(@"request fail"); }]; } |
ASI(注意添加libz类库并修改ASI源文件为非arc)
1 ASI的get同步请求
#import "ASIHTTPRequest.h"
/** * ASI的get同步请求 */ -(void) asiGetSynch{ // 获取url NSURL *url = [[NSURL alloc] initWithString:@"http://localhost:8070/MJServer/video"]; // 获取asi请求对象 ASIHTTPRequest *request = [ASIHTTPRequest requestWithURL:url]; // 发送同步请求 [request startSynchronous]; NSError *error = [request error]; if (error) { NSLog(@"请求失败"); }else{ // NSString *data = [request responseString]; NSData *data = [request responseData]; NSDictionary *result = [NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingAllowFragments error:nil]; NSLog(@"result -- %@", result); } } |
2 ASI的get异步请求
/** * ASI的get异步请求 * 须知:ASI监听请求过程有delegate、block和selector三种方式, * 经测试发现,delegate和block可以同时执行,selector和block也可以同时执行,但delegate和selector共存时(包括三者共存)不执行delegate * 执行顺序:delegate > selector > block * 通过responseData和responseString获取不到数据 * 使用了代理就不能直接通过responseData和responseString获取到数据 */ -(void) asiGetAsynch{ // 获取url NSURL *url = [[NSURL alloc] initWithString:@"http://localhost:8070/MJServer/video"]; // 获取asi请求对象 ASIHTTPRequest *request = [ASIHTTPRequest requestWithURL:url]; // 设置ASIHTTPRequestDelegate代理。 request.delegate = self; // 发送异步请求 [request startAsynchronous]; // 设置监听请求过程的block [request setStartedBlock:^{ NSLog(@"block请求开始"); }]; [request setDataReceivedBlock:^(NSData *data) { NSLog(@"block获得请求数据 -- %@", [NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingAllowFragments error:nil]); }]; [request setCompletionBlock:^{ NSLog(@"block请求结束"); }]; // 设置监听请求过程的selector [request setDidStartSelector:@selector(start:)]; [request setDidReceiveDataSelector:@selector(receiveData:)]; [request setDidFinishSelector:@selector(finish:)]; } #pragma mark selector监听方法 -(void)start:(ASIHTTPRequest *)request{ NSLog(@"selector请求开始"); } -(void) receiveData:(ASIHTTPRequest *) request{ // 这里获取不到数据 NSLog(@"selector获得请求数据 -- %@", [request responseString]); } -(void)finish:(ASIHTTPRequest *)request{ NSLog(@"selector请求结束"); } #pragma mark 实现ASIHTTPRequestDelegate的代理方法 - (void)request:(ASIHTTPRequest *)request didReceiveData:(NSData *)data{ NSLog(@"delegate获得请求数据 -- %@", [NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingAllowFragments error:nil]); } - (void)requestStarted:(ASIHTTPRequest *)request{ NSLog(@"delegate请求开始"); } - (void)requestFinished:(ASIHTTPRequest *)request{ NSLog(@"delegate请求结束"); } - (void)requestFailed:(ASIHTTPRequest *)request{ NSLog(@"delegate请求失败"); } |
3 ASI的post异步请求
#import "ASIFormDataRequest.h"
/** * ASI的post异步请求 */ -(void) asiPostAsynch{ // 获取url NSURL *url = [[NSURL alloc] initWithString:@"http://localhost:8070/MJServer/login"]; // 获取ASI表单请求对象 ASIFormDataRequest *request = [ASIFormDataRequest requestWithURL:url]; // 设置请求参数 [request setPostValue:@"123" forKey:@"username"]; [request setPostValue:@"123" forKey:@"pwd"]; // 使用了代理就不能直接通过responseData和responseString获取数据 // request.delegate = self; // 发送异步请求 [request startAsynchronous]; // 设置监听(这里只演示block方法) __weak ASIFormDataRequest *req = request; [request setCompletionBlock:^{ NSLog(@"selector获得请求数据 -- %@", [req responseString]); }]; } |