HTTP请求
1. NSURLConnectiong
1.同步GET请求
// 1.创建请求路径(url)
NSURL *url = [NSURL URLWithString:@""];
// 2.通过请求路径(url)创建请求对象(request)
NSURLRequest *request = [NSURLRequest requestWithURL:url];
// 3.向服务器发送同步请求(data)
NSData *data = [NSURLConnection sendSynchronousRequest:request returningResponse:nil error:nil];
// sendSynchronousRequest阻塞式的方法，等待服务器返回数据
// 4.解析服务器返回的数据(解析成字符串)
NSString *string = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];
2. 异步GET请求
// 1.创建请求路径(url)
NSURL *url = [NSURL URLWithString:@""];
// 2.通过请求路径(url)创建请求对象(request)
NSURLRequest *request = [NSURLRequest requestWithURL:url];
// 3.向服务器发送异步请求
[NSURLConnection sendAsynchronousRequest:request queue:[[NSOperationQueue alloc] init] completionHandler:^(NSURLResponse *response, NSData *data, NSError *connectionError) {
// 请求完毕会来到这个block
// 4.解析服务器返回的数据（解析成字符串）
NSString *string = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];
NSLog(@"%@", string);
}];
3. 通过代理发送异步请求
// 1.创建请求路径(url)
NSURL *url = [NSURL URLWithString:@""];
// 2.通过请求路径(url)创建请求对象(request)
NSURLRequest *request = [NSURLRequest requestWithURL:url];
// 3.通过代理创建连接对象
[NSURLConnection connectionWithRequest:request delegate:self];
// [[NSURLConnection alloc] initWithRequest:request delegate:self];
// NSURLConnection *conn = [[NSURLConnection alloc] initWithRequest:request delegate:self startImmediately:NO];
// startImmediately:是否立即发送请求
// 开始发送请求
// [conn start];
// 取消发送请求
// [conn cancel];
#pragma mark - <NSURLConnectionDataDelegate>
// 接收到服务器的响应
-(void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response;
// 接收到服务器的数据（如果数据量比较大，这个方法会被调用多次）
-(void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data; // 不断拼接服务器返回的数据
// 服务器的数据成功接收完毕
-(void)connectionDidFinishLoading:(NSURLConnection *)connection;
// 请求失败（比如请求超时）
-(void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error;
4. 同步POST请求
// 1.创建请求路径(url)
NSURL *url = [NSURL URLWithString:@""];
// 2.通过请求路径(url)创建请求对象(request)
NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url];
// 更改请求方法
request.HTTPMethod = @"POST";
// 设置请求体
request.HTTPBody = [@"" dataUsingEncoding:NSUTF8StringEncoding];
// 设置超时(5秒后超时)
request.timeoutInterval = 5;
// 设置请求头(非必要，看情况)
// [request setValue:@"iOS 9.0" forHTTPHeaderField:@"User-Agent"];
// 3.向服务器发送同步请求
[NSURLConnection sendSynchronousRequest:request returningResponse:nil error:nil];
5. 异步POST请求
// 1.创建请求路径(url)
NSURL *url = [NSURL URLWithString:@""];
// 2.通过请求路径(url)创建请求对象(request)
NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url];
// 更改请求方法
request.HTTPMethod = @"POST";
// 设置请求体
request.HTTPBody = [@"" dataUsingEncoding:NSUTF8StringEncoding];
// 设置超时(5秒后超时)
request.timeoutInterval = 5;
// 设置请求头
// [request setValue:@"iOS 9.0" forHTTPHeaderField:@"User-Agent"];
// 3.向服务器发送异步请求
[NSURLConnection sendAsynchronousRequest:request queue:[NSOperationQueue mainQueue] completionHandler:^(NSURLResponse *response, NSData *data, NSError *connectionError) {
if (connectionError) { // 比如请求超时
NSLog(@"----请求失败");
} else {
NSLog(@"------%@", [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding]);
}
}];
6. NSURLConnection 中文URL处理
NSString *urlStr = @"";
// 将中文URL进行转码
urlStr = [urlStr stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding];
NSURL *url = [NSURL URLWithString:urlStr];
2. NSURLSession
GET请求
// 第一种GET请求
// 获得NSURLSession对象
NSURLSession *session = [NSURLSession sharedSession];
// 创建任务
NSURLSessionDataTask *task = [session dataTaskWithRequest:[NSURLRequest requestWithURL:[NSURL URLWithString:@""]] completionHandler:^(NSData *data, NSURLResponse *response, NSError *error) {
NSLog(@"%@", [NSJSONSerialization JSONObjectWithData:data options:kNilOptions error:nil]);
}];
// 启动任务
[task resume];
// 第二种GET请求
// 获得NSURLSession对象
NSURLSession *session = [NSURLSession sharedSession];
// 创建任务
NSURLSessionDataTask *task = [session dataTaskWithURL:[NSURL URLWithString:@""] completionHandler:^(NSData *data, NSURLResponse *response, NSError *error) {
NSLog(@"%@", [NSJSONSerialization JSONObjectWithData:data options:kNilOptions error:nil]);
}];
// 启动任务
[task resume];
POST请求
// 获得NSURLSession对象
NSURLSession *session = [NSURLSession sharedSession];
// 创建请求
NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:[NSURL URLWithString:@""]];
request.HTTPMethod = @"POST"; // 请求方法
request.HTTPBody = [@"" dataUsingEncoding:NSUTF8StringEncoding]; // 请求体
// 创建任务
NSURLSessionDataTask *task = [session dataTaskWithRequest:request completionHandler:^(NSData *data, NSURLResponse *response, NSError *error) {
NSLog(@"%@", [NSJSONSerialization JSONObjectWithData:data options:kNilOptions error:nil]);
}];
// 启动任务
[task resume];
通过代理发送请求
// 获得NSURLSession对象
NSURLSession *session = [NSURLSession sessionWithConfiguration:[NSURLSessionConfiguration defaultSessionConfiguration] delegate:self delegateQueue:[[NSOperationQueue alloc] init]];
// 创建任务
NSURLSessionDataTask *task = [session dataTaskWithRequest:[NSURLRequest requestWithURL:[NSURL URLWithString:@""]]];
// 启动任务
[task resume];
#pragma mark - <NSURLSessionDataDelegate>
// 1.接收到服务器的响应
-(void)URLSession:(NSURLSession *)session dataTask:(NSURLSessionDataTask *)dataTask didReceiveResponse:(NSURLResponse *)response completionHandler:(void (^)(NSURLSessionResponseDisposition))completionHandler
{
// 允许处理服务器的响应，才会继续接收服务器返回的数据
completionHandler(NSURLSessionResponseAllow);
// void (^)(NSURLSessionResponseDisposition)
}
// 2.接收到服务器的数据（可能会被调用多次）
-(void)URLSession:(NSURLSession *)session dataTask:(NSURLSessionDataTask *)dataTask didReceiveData:(NSData *)data
{
NSLog(@"%s", __func__);
}
// 3.请求成功或者失败（如果失败，error有值）
-(void)URLSession:(NSURLSession *)session task:(NSURLSessionTask *)task didCompleteWithError:(NSError *)error
{
NSLog(@"%s", __func__);
}
AFNetworking
// 第一种GET请求
AFHTTPRequestOperationManager *mgr = [AFHTTPRequestOperationManager manager];
NSDictionary *params = @{
@"" : @"",
@"" : @""
};
[mgr GET:@"" parameters:params
success:^(AFHTTPRequestOperation *operation, id responseObject) {
NSLog(@"请求成功---%@", responseObject);
} failure:^(AFHTTPRequestOperation *operation, NSError *error) {
NSLog(@"请求失败---%@", error);
}];
// 第二种GET请求
// AFHTTPSessionManager内部包装了NSURLSession
AFHTTPSessionManager *mgr = [AFHTTPSessionManager manager];
NSDictionary *params = @{
@"" : @"",
@"" : @""
};
[mgr GET:@"" parameters:params success:^(NSURLSessionDataTask *task, id responseObject) {
NSLog(@"请求成功---%@", responseObject);
} failure:^(NSURLSessionDataTask *task, NSError *error) {
NSLog(@"请求失败---%@", error);
}];
// AFHTTPRequestOperationManager内部包装了NSURLConnection
AFHTTPRequestOperationManager *mgr = [AFHTTPRequestOperationManager manager];
NSDictionary *params = @{
@"" : @"",
@"" : @""
};
[mgr POST:@"" parameters:params
success:^(AFHTTPRequestOperation *operation, id responseObject) {
NSLog(@"请求成功---%@", responseObject);
} failure:^(AFHTTPRequestOperation *operation, NSError *error) {
NSLog(@"请求失败---%@", error);
}];
