URL : NSUrl 网址
Request : NSRequest NSMutableRequest
connection: NSURLConnection
http://www.xxxxxxx/login.php?username= sasa & password = dsdsds;
request(请求),常用的方式有两种:GET,POST
GET请求方式的特点:请求体,(请求参数)直接拼接在URL之后
GET请求的特点:1,长度受限,最大为255字节,2,安全性差参数容易被别人看见,导致泄漏,尤其是重要的信息(比如用
户名,密码)。3,优点:可以直接用浏览器打开,方便测试
通常使用GET从服务器获取信息,并不会通过GET方式向服务器提交大量信息
请求:post get delete put
链接:同步 异步
同步链接:当前网络线程去做网络链接,链接过程中,线程一直处于被占用状态,次线程的其他任务执行会处于等待状态,网
络请求结束后,其他的任务依次执行,
通常情况下,同步连接会卡死主线程,导致页面元素无法被点击,产生假死现象
如果数据量小,且网速较快,同步连接是最佳选择
同步连接代码简单,只需要一个类方法即可,这个类方法接受完全部分的数据之后,将完整的数据作为返回值,返回给外界
NSURLResponse *response = nil;
NSError *error = nil;
// 1 创建URL
NSURL *url = [NSURL URLWithString:@"http://172.16.1.123:8888/xpmz/joke/index.php/site/articlejson/?p=33"];// 2 发送请求
NSURLRequest *request = [[NSURLRequest alloc]initWithURL:url cachePolicy:NSURLRequestUseProtocolCachePolicy timeoutInterval:5]; // 3 获取数据
NSData *date = [NSURLConnection sendSynchronousRequest:request returningResponse:&response error:&error]; NSDictionary *dic = [NSJSONSerialization JSONObjectWithData:date options:NSJSONReadingMutableContainers error:nil]; NSLog(@"content:%@", [[dic objectForKey:@"arr"] objectForKey:@"content"]); NSLog(@"response: %@", response); NSLog(@"error: %@", error); 异步请求:有一个新的线程去做网络连接,当前线程并处于空闲状态,可以处理本线程的其他任务,不会出现所谓的“假死‘现象,
一般网速慢,传输数据量较大时,应选择异步联接,
异步链接的的缺点:异步链接是有其他线程去完成的,完成的时间随机性很大,业务逻辑需要做好处理
NSURL *url = [NSURL URLWithString:@"http://172.16.1.123:8888/xpmz/joke/index.php/site/articlejson/?p=33"];
NSURLRequest *request = [[NSURLRequest alloc]initWithURL:url cachePolicy:NSURLRequestUseProtocolCachePolicy timeoutInterval:5];
NSOperationQueue *quene = [[NSOperationQueue alloc]init];
[NSURLConnection sendAsynchronousRequest:request queue:quene completionHandler:^(NSURLResponse *response, NSData *data, NSError *connectionError) {
NSLog(@"asyn :%@", response);
NSLog(@"date :%@", data);
NSLog(@"connectionError:%@", connectionError);
}];
post提交(同步) NSURLResponse *response = nil;
NSError *error = nil;
NSURL *url = [NSURL URLWithString:@"http://172.16.1.123:8888/xpmz/joke/index.php/site/loging"];
NSMutableURLRequest *request = [[NSMutableURLRequest alloc]initWithURL:url cachePolicy:NSURLRequestUseProtocolCachePolicy timeoutInterval:5];
NSData *data1 = [@"user_email=361131953@qq.com&user_pass=123456" dataUsingEncoding:NSUTF8StringEncoding];
// 设置提交方式
[request setHTTPMethod:@"POST"];
[request setHTTPBody:data1];
NSData *data = [NSURLConnection sendSynchronousRequest:request returningResponse:&response error:&error];
NSString *str = [[NSString alloc]initWithData:data encoding:NSUTF8StringEncoding];
post(异步提交)
NSURL *url = [NSURL URLWithString:@"http://172.16.1.123:8888/xpmz/joke/index.php/site/loging"];
NSMutableURLRequest *request = [[NSMutableURLRequest alloc]initWithURL:url cachePolicy:NSURLRequestUseProtocolCachePolicy timeoutInterval:5];
NSData *data1 = [@"user_email=361131953@qq.com&user_pass=123456" dataUsingEncoding:NSUTF8StringEncoding];
// 设置提交方式
[request setHTTPMethod:@"POST"];
[request setHTTPBody:data1];
NSOperationQueue *queue = [[NSOperationQueue alloc]init];
[NSURLConnection sendAsynchronousRequest:request queue:queue completionHandler:^(NSURLResponse *response, NSData *data, NSError *connectionError) {
NSDictionary *dic = [NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingMutableContainers error:nil];
NSLog(@"%@", data);
NSLog(@"%@", response);
NSLog(@"%@", [dic objectForKey:@"msg"]);
}];
NSURL *url = [[NSURL alloc] initWithString:@"http://style.guofenmai.com/v1/api/style/hot?page=2"];
NSURLRequest *request = [NSURLRequest requestWithURL:url];
[NSURLConnection sendAsynchronousRequest:request queue:[[NSOperationQueue alloc] init] completionHandler:^(NSURLResponse *response, NSData *data, NSError *connectionError) {
NSDictionary *dic = [NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingMutableLeaves error:nil];
NSArray *list = [[dic objectForKey:@"content"] objectForKey:@"list"];
// NSLog(@"%@",);
for (NSDictionary *item in list) {
NSLog(@"%@",item);
Goods *goods = [[Goods alloc] init];
[goods setValuesForKeysWithDictionary:item];
[self.allGoods addObject:goods];
}
NSLog(@"%@",self.allGoods);
[self.tableView performSelectorOnMainThread:@selector(reloadData) withObject:nil waitUntilDone:NO];
}];