iOS开发之网络基础知识

iOS开发之网络基础知识

1. 一次HTTP请求的完整过程

　　(1)浏览器或应用发起HTTP请求, 请求包含HTTP请求(GET,POST), 地址(URL), 协议(HTTP/1.1), 请求头部, 附加信息

　　(2)web服务接收到请求, 进行处理, 页面分为两种页面(静态html页面, 动态php,asp,jsp页面)

　　(3)数据通过响应response返回给浏览器和应用

　　GET请求和POST的区别(面试题常考)

　　　　(1)都是HTTP请求的方式, GET一般只是为了获取数据, 而POST获取的同时上传附加数据

　　　　(2)GET所有参数都在URL网址中, POST请求参数放在请求头中

　　　　(3)应用: 只是简单地获取数据, 使用GET请求,   登录(传密码), 上传文件或图片, 使用POST请求

- (void)viewDidLoad
{
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.
    
    //1.
//    [self testGetRequest];
    
    //2.
//    [self testpostRequest];
    
    //3.上传文件(上传图片)
//    [self testUploadFile];
    
    //4.下载文件
//    [self testDownloadFile];
    
    //5.监控网络状态
    [self testMonitorNetworkStatus];
    
}

-(void)testMonitorNetworkStatus
{
    AFHTTPRequestOperationManager *manager = [[AFHTTPRequestOperationManager alloc] initWithBaseURL:[NSURL URLWithString:@"www.baidu.com"]];
    [manager.reachabilityManager setReachabilityStatusChangeBlock:^(AFNetworkReachabilityStatus status) {
        
        NSDictionary *dic = @{@(AFNetworkReachabilityStatusUnknown): @"未知",@(AFNetworkReachabilityStatusNotReachable): @"不可达",@(AFNetworkReachabilityStatusReachableViaWWAN): @"GPRS",@(AFNetworkReachabilityStatusReachableViaWiFi): @"Wifi"};
        NSLog(@"状态为 %@",dic[@(status)]);
        
    }];
    [manager.reachabilityManager startMonitoring];
    
}

-(void)testDownloadFile
{
    NSString *urlString = @"ttp://imgcache.qq.com/club/item/avatar/zip/7/i87/all.zip";
    
    //创建会话管理器对象(通过默认配置)
    AFURLSessionManager *manager = [[AFURLSessionManager alloc] initWithSessionConfiguration:[NSURLSessionConfiguration defaultSessionConfiguration]];
    NSURLSessionDownloadTask *task = [manager downloadTaskWithRequest:[NSURLRequest requestWithURL:[NSURL URLWithString:urlString]] progress:nil destination:^NSURL *(NSURL *targetPath, NSURLResponse *response) {
        
        //返回文件保存的位置
        NSString *path = [NSString stringWithFormat:@"%@/Documents/all.zip",NSHomeDirectory()];
        NSLog(@"path == %@",path);
        return [NSURL fileURLWithPath:path];
        
    } completionHandler:^(NSURLResponse *response, NSURL *filePath, NSError *error) {
        NSLog(@"下载完成");
    }];
    
    [task resume];
    
}

-(void)testUploadFile
{
    NSString *urlString = @"http://quiet.local/uploadtest/upload.php";
    
    AFHTTPRequestOperationManager *manager = [AFHTTPRequestOperationManager manager];
    manager.responseSerializer = [AFHTTPResponseSerializer serializer];
    [manager POST:urlString parameters:nil constructingBodyWithBlock:^(id<AFMultipartFormData> formData) {
        
        NSString *path = [[NSBundle mainBundle] pathForResource:@"http://quiet.local/uploadtest/pk.php" ofType:nil];
        [formData appendPartWithFileURL:[NSURL fileURLWithPath:path] name:@"image1" fileName:@"10_5.jpg" mimeType:@"image/jpeg" error:nil];
        
    } success:^(AFHTTPRequestOperation *operation, id responseObject) {
        
        NSString *str = [[NSString alloc] initWithData:responseObject encoding:NSUTF8StringEncoding];
        NSLog(@"str === %@",str);
        
    } failure:^(AFHTTPRequestOperation *operation, NSError *error) {
        NSLog(@"error === %@",error);
    }];
    
}

-(void)testpostRequest
{
    NSString *urlString = @"http://quiet.local/testdir/login.php";
    
    AFHTTPRequestOperationManager *manager = [AFHTTPRequestOperationManager manager];
    manager.responseSerializer = [AFHTTPResponseSerializer serializer];
    
    [manager POST:urlString parameters:@{@"user": @"quiet",@"password":@"123"} success:^(AFHTTPRequestOperation *operation, id responseObject) {
        NSString *str = [[NSString alloc] initWithData:responseObject encoding:NSUTF8StringEncoding];
        NSLog(@"str = %@",str);
    } failure:^(AFHTTPRequestOperation *operation, NSError *error) {
        NSLog(@"error = %@",error);
    }];
    
}

-(void)testGetRequest
{
    NSString *urlString = @"http://www.baidu.com";
    
    //定义AFHTTPRequestOperationManager管理
    AFHTTPRequestOperationManager *manager = [AFHTTPRequestOperationManager manager];
    //注意:默认认为数据是JSON,content-type也是JSON
    //解决:设置解析器为HTTP形式,下载回来是NSData
    manager.responseSerializer = [AFHTTPResponseSerializer serializer];
    [manager GET:urlString parameters:nil success:^(AFHTTPRequestOperation *operation, id responseObject) {
        
        //responseObject重要参数,包含下载数据
//        NSLog(@"o = %@",responseObject);
        NSString *str = [[NSString alloc] initWithData:responseObject encoding:NSUTF8StringEncoding];
        NSLog(@"str = %@",str);
        
    } failure:^(AFHTTPRequestOperation *operation, NSError *error) {
        NSLog(@"error = %@",error);
    }];
    
}