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ftp:(文件传输协议)

http:(超文本传输协议)

https:(安全超文本传输协议)

file:(本地文件协议)

Xcode7设置网络：

打断点：在输出框 输入：po self.array 会打印出里面的对象

或者：

<key>NSAppTransportSecurity</key><dict>

1. GET：

1.1 GET同步：

sendSynchronousRequest:request returningResponse:nil error:nil

1> 获取网址

2> 建立连接，请求数据（NSMutableURLRequest *request），获取数据：NSURLConnection sendSynchronousRequest

3> 对数据进行解析

- (IBAction)getOne:(id)sender {        // 初始化数组属性    self.arrayAllNews = [[NSMutableArray alloc] init];            // 1. 网址    NSString *string = @"http://ipad-bjwb.bjd.com.cn/DigitalPublication/publish/Handler/APINewsList.ashx?date=20131129&startRecord=1&len=5&udid=1234567890&terminalType=Iphone&cid=213";    // url    NSURL *url = [NSURL URLWithString:string];    // 2. 请求对象  可变的  传了地址(将url给一个请求对象)    NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url];    // 3. 建立连接 请求数据    NSData *data = [NSURLConnection sendSynchronousRequest:request returningResponse:nil error:nil];        // 4. 解析：在解析之前判断data是否拿到了数据    if (data != nil) {        // 拿到最外层的字典        NSDictionary *dic = [NSJSONSerialization JSONObjectWithData:data options:0 error:nil];        // 用model处理数据        // 外层一个大的news 里面是一堆字典        for (NSDictionary *diction in dic[@"news"]) {            NewsModel *model = [[NewsModel alloc] init];            [model setValuesForKeysWithDictionary:diction];            [self.arrayAllNews addObject:model];        }    }    // 遍历打印：    for (NewsModel *model in self.arrayAllNews) {        NSLog(@"%@", model);    }   }

1.2 GET session：

dataTaskWithRequest:request completionHandler:^(NSData * _Nullable data, NSURLResponse * _Nullable response, NSError * _Nullable error)

首先：[NSURLSession sharedSession]

设置URL

请求对象

建立连接 请求数据

- (IBAction)session:(id)sender {    NSURLSession *session = [NSURLSession sharedSession];    NSURL *url = [NSURL URLWithString:@"http://ipad-bjwb.bjd.com.cn/DigitalPublication/publish/Handler/APINewsList.ashx?date=20131129&startRecord=1&len=5&udid=1234567890&terminalType=Iphone&cid=213"];        NSURLRequest *request = [NSURLRequest requestWithURL:url];        NSURLSessionDataTask *task = [session dataTaskWithRequest:request completionHandler:^(NSData * _Nullable data, NSURLResponse * _Nullable response, NSError * _Nullable error) {        if (data) {            NSDictionary *dic = [NSJSONSerialization JSONObjectWithData:data options:0 error:nil];            // 后面的内容：将字典转为model存储 和之前的一样        }            }];    // 必须调用这个方法 才会有数据    [task resume];    }

1.3 GET 异步：

sendAsynchronousRequest:request queue:[NSOperationQueue mainQueue] completionHandler:^(NSURLResponse * _Nullable response, NSData * _Nullable data, NSError * _Nullable connectionError)

有block

- (IBAction)buttonGetTwo:(id)sender {        self.arrayAllNews1 = [[NSMutableArray alloc] init];            NSURL *url = [NSURL URLWithString:@"http://ipad-bjwb.bjd.com.cn/DigitalPublication/publish/Handler/APINewsList.ashx?date=20131129&startRecord=1&len=5&udid=1234567890&terminalType=Iphone&cid=213"];        // 创建请求    NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url];    // 默认就是GET形式  所以可以不用写    [request setHTTPMethod:@"GET"];    // 建立连接    [NSURLConnection sendAsynchronousRequest:request queue:[NSOperationQueue mainQueue] completionHandler:^(NSURLResponse * _Nullable response, NSData * _Nullable data, NSError * _Nullable connectionError) {        if (data != nil) {            NSDictionary *dic = [NSJSONSerialization JSONObjectWithData:data options:0 error:nil];            for (NSDictionary *diction in dic[@"news"]) {                NewsModel *model = [[NewsModel alloc] init];                [model setValuesForKeysWithDictionary:diction];                [self.arrayAllNews1 addObject:model];            }        }        for (NewsModel *model in self.arrayAllNews1) {            NSLog(@"%@", model);        }    }];    }

2. POST：

2.1 POST异步：Block形式

设置URL

单独封装数据

设置body

建立连接 请求数据

- (IBAction)postBlock:(id)sender {        // 1. 初始化    self.arrayAllNews2 = [[NSMutableArray alloc] init];        // 2. 设置URL    NSURL *url = [NSURL URLWithString:@"http://ipad-bjwb.bjd.com.cn/DigitalPublication/publish/Handler/APINewsList.ashx"];    NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url];    // 3. 制作body（将数据单独拿出来 封装）    NSString *param = @"date=20131129&startRecord=1&len=5&udid=1234567890&terminalType=Iphone&cid=213";    NSData *data = [param dataUsingEncoding:NSUTF8StringEncoding];    // 4. 设置body    [request setHTTPBody:data];        [request setHTTPMethod:@"POST"];// 这个要写        // connection建立连接 请求数据    [NSURLConnection sendAsynchronousRequest:request queue:[NSOperationQueue mainQueue] completionHandler:^(NSURLResponse * _Nullable response, NSData * _Nullable data, NSError * _Nullable connectionError) {        if (data) {            NSDictionary *dic = [NSJSONSerialization JSONObjectWithData:data options:0 error:nil];            NSLog(@"%@",dic);            for (NSDictionary *diction in dic[@"news"]) {                NewsModel *model = [[NewsModel alloc] init];                [model setValuesForKeysWithDictionary:diction];                [self.arrayAllNews2 addObject:model];            }        }        for (NewsModel *model in self.arrayAllNews2) {            NSLog(@"%@", model);        }    }];}

2.2 POST代理：

遵守协议：<NSURLConnectionDataDelegate>

#pragma mark POST异步代理形式- (IBAction)postDelegate:(id)sender {    NSURL *url = [NSURL URLWithString:@"http://ipad-bjwb.bjd.com.cn/DigitalPublication/publish/Handler/APINewsList.ashx"];    NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url];    [request setHTTPMethod:@"POST"];// 设置请求形式    NSString *string = @"date=20131129&startRecord=1&len=5&udid=1234567890&terminalType=Iphone&cid=213";    NSData *data = [string dataUsingEncoding:NSUTF8StringEncoding];    [request setHTTPBody:data];        // 建立连接 请求数据    NSURLConnection *connection = [[NSURLConnection alloc] initWithRequest:request delegate:self];    // 启动请求  才会调用代理方法    [connection start];}#pragma mark POST代理形式的代理方法：#pragma 接收响应-(void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response {    NSLog(@"接收到响应了");    self.data = [[NSMutableData alloc] init];}#pragma  接收数据（拼接）-(void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data {    [self.data appendData:data];}#pragma 结束传输数据（然后进行解析）-(void)connectionDidFinishLoading:(NSURLConnection *)connection {    // 数据解析：JSON    // 返回的是id类型  （根据数据判断返回的具体类型）    NSDictionary *dic = [NSJSONSerialization JSONObjectWithData:self.data options:0 error:nil];    NSLog(@"%@",dic);}

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