iOS网络学习

//同步GET
// 1.将网址初始化成一个OC字符串对象
NSString *urlStr = [NSString stringWithFormat:@"http://www.baidu.com/%@?%@", @"中国", @"陕西"];//这里的网址是随便写的，具体要根据提供的服务器文档来创建对应的请求。
// 如果网址中存在中文,进行URLEncode
NSString *newUrlStr = [urlStr stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding];
// 2.构建网络URL对象, NSURL
NSURL *url = [NSURL URLWithString:newUrlStr];
// 3.创建网络请求
NSURLRequest *request = [NSURLRequest requestWithURL:url cachePolicy:NSURLRequestReloadIgnoringLocalCacheData timeoutInterval:10];
// 创建同步链接
NSURLResponse *response = nil;
NSError *error = nil;
NSData *data = [NSURLConnection sendSynchronousRequest:request returningResponse:&response error:&error];//注意后面两个参数都是放地址，暂且先设置为nil

// 1.根据网址初始化OC字符串对象
NSString *urlStr = [NSString stringWithFormat:@"%@",@"123" ];
// 2.创建NSURL对象
NSURL *url = [NSURL URLWithString:urlStr];
// 3.创建请求
NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url];
// 4.创建参数字符串对象
NSString *parmStr = @"method=album.channel.get&appKey=myKey&format=json&channel=t&pageNo=1&pageSize=10";
// 5.将字符串转为NSData对象
NSData *pramData = [parmStr dataUsingEncoding:NSUTF8StringEncoding]
4000
;
// 6.设置请求体
[request setHTTPBody:pramData];
// 7.设置请求方式
[request setHTTPMethod:@"POST"];

// 创建同步链接
NSData *data = [NSURLConnection sendSynchronousRequest:request returningResponse:nil error:nil];

NSString *urlStr = [NSString stringWithFormat:@"http://image.zcool.com.cn/56/13/1308200901454.jpg"];
NSString *newStr = [urlStr stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding];
NSURL *url = [NSURL URLWithString:newStr];
NSURLRequest *requst = [NSURLRequest requestWithURL:url cachePolicy:NSURLRequestReloadIgnoringLocalCacheData timeoutInterval:10];
//异步链接(形式1,较少用)
[NSURLConnection sendAsynchronousRequest:requst queue:[NSOperationQueue mainQueue] completionHandler:^(NSURLResponse *response, NSData *data, NSError *connectionError) {
self.imageView.image = [UIImage imageWithData:data];
// 解析
NSDictionary *dic = [NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingMutableContainers error:nil];
NSLog(@"%@", dic);
}];

// POST请求
NSString *urlString = [NSString stringWithFormat:@"%@",kVideoURL];
//创建url对象
NSURL *url = [NSURL URLWithString:urlString];
//创建请求
NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url cachePolicy:NSURLRequestReloadIgnoringLocalCacheData timeoutInterval:10];
//创建参数字符串对象
NSString *parmStr = [NSString stringWithFormat:@"method=album.channel.get&appKey=myKey&format=json&channel=t&pageNo=1&pageSize=10"];
//将字符串转换为NSData对象
NSData *data = [parmStr dataUsingEncoding:NSUTF8StringEncoding];
[request setHTTPBody:data];
[request setHTTPMethod:@"POST"];
//创建异步连接（形式二）
[NSURLConnection connectionWithRequest:request delegate:self];

// 服务器接收到请求时
- (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response
{
}
// 当收到服务器返回的数据时触发, 返回的可能是资源片段
- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data
{
}
// 当服务器返回所有数据时触发, 数据返回完毕
- (void)connectionDidFinishLoading:(NSURLConnection *)connection
{
}
// 请求数据失败时触发
- (void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error
{
NSLog(@"%s", __FUNCTION__);
}