NSData的同步下载与NSConnection的同步下载

    NSString * path = @"http://10.0.100.8/sns/my/user_list.php";
    
    //转网址对象
    NSURL * url = [NSURL URLWithString:path];
    
    //转Data
    NSData * data = [NSData dataWithContentsOfURL:url];
    
    if (data) {
         id obj = [NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingMutableContainers error:nil];
        //这是一个同步请求  请求和响应在一起
        NSLog(@"%@",obj);
    }
    
    //同步下载会堵塞线程  主线程 --- 显示UI
    
    UIAlertView * alert = [[UIAlertView alloc]initWithTitle:@"进入主界面" message:nil delegate:nil cancelButtonTitle:nil otherButtonTitles:@"确定", nil];
    
    [alert show];

    NSString * path = @"http://10.0.100.8/sns/my/user_list.php";
    
    //转网址对象
    NSURL * url = [NSURL URLWithString:path];
    
    //转Data
    NSData * data = [NSData dataWithContentsOfURL:url];
    
    if (data) {
         id obj = [NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingMutableContainers error:nil];
        //这是一个同步请求  请求和响应一气呵成
        NSLog(@"%@",obj);
    }
    
    //同步下载会堵塞线程  主线程 --- 显示UI
    
    UIAlertView * alert = [[UIAlertView alloc]initWithTitle:@"进入主界面" message:nil delegate:nil cancelButtonTitle:nil otherButtonTitles:@"确定", nil];
    
    [alert show];