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网络请求

时间:2015-08-26 23:54:39      阅读:250      评论:0      收藏:0      [点我收藏+]

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新建一个工程

.h文件中

{

    UIImageView *imagev;

}

@property(nonatomic,strong)NSMutableData *myData;//接收下载的数据

.m文件中

- (void)viewDidLoad {

    [super viewDidLoad];

    

    UIButton *getButton =[UIButton buttonWithType:UIButtonTypeCustom];

    getButton.frame = CGRectMake(30, 40, 200, 40);

    [self.view addSubview:getButton];

    [getButton setTitle:@"同步GET" forState:UIControlStateNormal];

    [getButton setTitleColor:[UIColor blackColor] forState:UIControlStateNormal];

    getButton.layer.borderColor = [UIColor greenColor].CGColor;

    getButton.layer.borderWidth = 0.3;

    [getButton addTarget:self action:@selector(synchronizeGet) forControlEvents:UIControlEventTouchUpInside];

    

    

    

    UIButton *postButton =[UIButton buttonWithType:UIButtonTypeCustom];

    postButton.frame = CGRectMake(30, 90, 200, 40);

    [self.view addSubview:postButton];

    [postButton setTitle:@"同步POST" forState:UIControlStateNormal];

    [postButton setTitleColor:[UIColor blackColor] forState:UIControlStateNormal];

    postButton.layer.borderColor = [UIColor greenColor].CGColor;

    postButton.layer.borderWidth = 0.3;

    [postButton addTarget:self action:@selector(synchronizePost) forControlEvents:UIControlEventTouchUpInside];

    

    

    UIButton *dailiButton =[UIButton buttonWithType:UIButtonTypeCustom];

    dailiButton.frame = CGRectMake(30, 140, 200, 40);

    [self.view addSubview:dailiButton];

    [dailiButton setTitle:@"异步代理" forState:UIControlStateNormal];

    [dailiButton setTitleColor:[UIColor blackColor] forState:UIControlStateNormal];

    dailiButton.layer.borderColor = [UIColor greenColor].CGColor;

    dailiButton.layer.borderWidth = 0.3;

    [dailiButton addTarget:self action:@selector(yibuDelegata) forControlEvents:UIControlEventTouchUpInside];

    

    UIButton *blockButton =[UIButton buttonWithType:UIButtonTypeCustom];

    blockButton.frame = CGRectMake(30, 190, 200, 40);

    [self.view addSubview:blockButton];

    [blockButton setTitle:@"异步block" forState:UIControlStateNormal];

    [blockButton setTitleColor:[UIColor blackColor] forState:UIControlStateNormal];

    blockButton.layer.borderColor = [UIColor greenColor].CGColor;

    blockButton.layer.borderWidth = 0.3;

    [blockButton addTarget:self action:@selector(yibuBlock) forControlEvents:UIControlEventTouchUpInside];

    

    

    imagev = [[UIImageView alloc]init];

    imagev.frame = CGRectMake(10, 250, self.view.frame.size.width-20, 400);

    imagev.backgroundColor = [UIColor redColor];

    [self.view addSubview:imagev];

 

}

 

//同步get方法

//get是完全公开的 网址是暴露的

//拿到网址的图片并显示到uiimageview上

//http://www.sinaimg.cn/dy/slidenews/4_img/2014_50/704_1502763_259801.jpg

//-(void)synchronizeGet

//{

//    //获取网址

//    NSString *str = @"http://www.sinaimg.cn/dy/slidenews/4_img/2014_50/704_1502763_259801.jpg";

//    //将字符串转换成网址

//    NSURL *url =[NSURL URLWithString:str];

//    //创建请求

//    //1参 URL网址

//    //2参 缓存方式(弊端:缓存到内存,数据量大的话会很占用内存,正确的应该缓存到本地)

//    //3参 请求超时时间

//    NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url cachePolicy:NSURLRequestUseProtocolCachePolicy timeoutInterval:60];

//    //设置请求方式

//   // request.HTTPMethod =@"GET";//(这句也可以不写,因为默认就是get)

//    //发送请求(同步请求)

//    //1参 request请求

//    //2参 服务器响应信息

//    //3参 错误信息

//    NSURLResponse *response = nil;//服务器信息

//    NSError *error = nil;//错误信息

//    // 程序会停在这里 直到下载结束才会继续执行后面的代码 所有就导致了APP假死现象

//    NSData *data = [NSURLConnection sendSynchronousRequest:request returningResponse:&response error:&error];//用NSURLConnection发送,用一个data接收 直到程序结束

//    //展示到uiimageview上

//    UIImage *image = [UIImage imageWithData:data];

//    imagev.image = image;

//}

-(void)synchronizeGet

{

    NSString *str = @"http://project.lanou3g.com/teacher/yihuiyun/lanouproject/activitylist.php";

    NSURL *url =[NSURL URLWithString:str];

    NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url cachePolicy:NSURLRequestUseProtocolCachePolicy timeoutInterval:60];

    NSURLResponse *response = nil;

    NSError *error = nil;

    NSData *data = [NSURLConnection sendSynchronousRequest:request returningResponse:&response error:&error];//data是下载下来豆瓣的信息

    //解析

    //最外层是大括号 字典

    NSDictionary *dic = [NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingMutableContainers error:nil];

    NSArray *array = [dic objectForKey:@"events"];

    NSDictionary *dic1 = [array objectAtIndex:0];

    NSLog(@"%@",[dic1 objectForKey:@"title"]);

    for (NSDictionary *dic1 in array) {

        NSLog(@"%@",[dic1 valueForKey:@"content"]);

    }

}

 

 

 

//同步post方式请求数据

-(void)synchronizePost

{

    //网址

    NSString *str = @"http://ipad-bjwb.bjd.com.cn/DigitalPublication/publish/Handler/APINewsList.ashx";

    NSURL *url =[NSURL URLWithString:str];

    NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url cachePolicy:NSURLRequestUseProtocolCachePolicy timeoutInterval:60];

    //设置请求方式

    request.HTTPMethod =@"POST";

    //需要携带body体 body中的内容是看不见的 是一个nsdata格式的数据 所以说post请求有保密性质 但是现在很多的APP的post请求还是被一些抓包工具抓出来

    NSString *bodyStr = @"date=20131129&startRecord=1&len=30&udid=1234567890&terminalType=Iphone&cid=213";//这段放保密信息

    //将字符串转化成nsdata

    NSData *data = [bodyStr dataUsingEncoding:NSUTF8StringEncoding];//编码方式

    //设置body体

    request.HTTPBody = data;

    //发送请求

    NSURLResponse *response = nil;

    NSError *error = nil;

    NSData *resultData = [NSURLConnection sendSynchronousRequest:request returningResponse:&response error:&error];

    //将data转换成字符串

    NSString *resultStr =[[NSString alloc] initWithData:resultData encoding:NSUTF8StringEncoding];

    NSLog(@"%@",resultStr);

}

//异步代理(不会卡)

-(void)yibuDelegata

{

    NSString *str =@"http://www.sinaimg.cn/dy/slidenews/4_img/2014_50/704_1502763_259801.jpg";

    NSURL *url =[NSURL URLWithString:str];

    NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url cachePolicy:NSURLRequestUseProtocolCachePolicy timeoutInterval:60];

    //用代理下载

    [NSURLConnection connectionWithRequest:request delegate:self];

    

    //拿图片的URL

   // NSData *data = [NSData dataWithContentsOfURL:<#(NSURL *)#>]

}

 

#pragma -mark 下载的代理方法(4个)

-(void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response

{

    //收到服务器的响应(初始化可变data)

    self.myData = [NSMutableData data];

    

}

//收到服务器返回的数据

-(void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data

{

    [self.myData appendData:data];

}

//下载结束

-(void)connectionDidFinishLoading:(NSURLConnection *)connection

{

    UIImage *image = [UIImage imageWithData:self.myData];

    imagev.image = image;

}

//下载失败,错误会走的方法

-(void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error

{

    

}

 

//异步block

-(void)yibuBlock

{

    NSString *str = @"http://www.sinaimg.cn/dy/slidenews/4_img/2014_50/704_1502763_259801.jpg";

    NSURL *url = [NSURL URLWithString:str];

    NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url cachePolicy:NSURLRequestUseProtocolCachePolicy timeoutInterval:60];

    //发送异步block请求

    

    //程序走到这一行 发送请求 不会卡住 继续执行下面的代码 当加载结束之后走block里面的代码

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

        //下载结束之后走这里

        //block里面三个参数: 服务器响应信息 下载的data 错误信息

        //展示到uiimageview上

        UIImage *image = [UIImage imageWithData:data];

        imagev.image = image;

    }];

}

效果图:

 

网络请求

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原文地址:http://www.cnblogs.com/wusang/p/4761876.html

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