网络请求三部
创建一个请求(添加接口,对接口进行解码,)
设定请求方式(将接口转为NSURL,设置请求[请求地址, 缓存策略, 超时时间],设置请求方式)
连接服务器([同步连接,异步连接]代理连接,block连接)
#import "MainViewController.h"
@interface MainViewController ()
@property (retain, nonatomic) IBOutlet UIImageView *ImageWiew;
//get请求方法
- (IBAction)getConnection:(id)sender;
//post请求方法
- (IBAction)postConnection:(id)sender;
//协议方式实现异步连接服务器
- (IBAction)buttonDelegate:(id)sender;
//block异步连接服务器
- (IBAction)buttonBlock:(id)sender;
//一个可变的数据属性,用于拼接每次从服务器请求的小数据块
@property (nonatomic , retain)NSMutableData *receiveData;
@end
@implementation MainViewController
- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
if (self) {
// Custom initialization
// //初始化方法
// self.receiveData = [NSMutableData data];
}
return self;
}
- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view.
}
- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
/*
#pragma mark - Navigation
// In a storyboard-based application, you will often want to do a little preparation before navigation
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
{
// Get the new view controller using [segue destinationViewController].
// Pass the selected object to the new view controller.
}
*/
- (void)dealloc {
[_ImageWiew release];
[super dealloc];
}
- (IBAction)getConnection:(id)sender {
//实现网络请求_get请求方式
//注意错误:地址不能有错,网络不能断
NSString *str = @"http://cdn.gq.com.tw.s3-ap-northeast-1.amazonaws.com/userfiles/p_w_picpaths_A1/6954/2011100658141857.jpg";
//要请求的图片地址
//网络请求三步
//1.创建一个请求,设定请求方式(GET/POST)
NSURL *url = [NSURL URLWithString:str];
//参数1:请求的地址信息(需要转成URL类型)
//参数2;请求的缓存策略(缓存策略,服务器指定的)
//参数3:设置超时的时间
NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url cachePolicy:NSURLRequestUseProtocolCachePolicy timeoutInterval:60];
//设置请求方式
request.HTTPMethod = @"GET";
//2.连接服务器,发送请求
//连接服务器两种不同的方式: 一,同步连接 二,异步连接
//同步连接服务器
//参数1:要发送的网络请求
//参数2:服务器对这次请求的响应信息
NSURLResponse *response = nil;
NSError *error = nil;
//这个方法会卡住整个应用程序,直到完整的数据被请求下来之后才继续执行
NSData *data = [NSURLConnection sendSynchronousRequest:request returningResponse:&response error:&error];
//把请求下来的数据(data)转换成图片
UIImage *p_w_picpath = [UIImage p_w_picpathWithData:data];
self.ImageWiew.p_w_picpath = p_w_picpath;
NSLog(@"服务器响应信息:%@", response);
NSLog(@"错误信息:%@", error);
}
- (IBAction)postConnection:(id)sender {
//创建一个post请求
//1.创建一个请求,设定pos
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";
//post请求,需要带一个数据;
NSString *strBody = @"date=20131129&startRecord=1&len=30&udid=1234567890&terminalType=Iphone&cid=213";
//把一段字符串转换为NSData类型,方便发送;
request.HTTPBody = [strBody dataUsingEncoding:NSUTF8StringEncoding];
//2.连接服务器
NSURLResponse *response = nil;
NSError *error = nil;
NSData *data = [NSURLConnection sendSynchronousRequest:request returningResponse:&response error:&error];
//转为字符串检测是什么类型的数据
NSString *resultStr = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];
NSLog(@"结果:%@",resultStr);
NSLog(@"服务器响应信息%@", response);
}
- (IBAction)buttonDelegate:(id)sender {
//基于协议的异步请求
//创建一个请求
NSString *string = @"http://api.douban.com/v2/movie/nowplaying?app_name=doubanmovie&client=e:iPhone4,1|y:iPhoneOS_6.1|s:mobile|f:doubanmovie_2|v:3.3.1|m:PP_market|udid:aa1b815b8a4d1e961347304e74b9f9593d95e1c5&alt=json&version=2&start=0&city=北京&apikey=0df993c66c0c636e29ecbb5344252a4a";
//带有特殊字符的汉子(汉字,|,..)需要提前转码
NSString *newStr = [string stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding];
NSURL *url = [NSURL URLWithString:newStr];
NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url cachePolicy:NSURLRequestUseProtocolCachePolicy timeoutInterval:60];
request.HTTPMethod = @"get";
//2.连接服务器
//创建一个网络连接对象
//设置网络连接的代理(这个代理有三个必须要实现的方法)(记得加代理<NSURLConnectionDataDelegate>)
NSURLConnection *connection = [[NSURLConnection alloc] initWithRequest:request delegate:self];
}
- (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response
{
//接收到服务器响应信息的时候(三次握手)
NSLog(@"服务器响应");
self.receiveData = [NSMutableData data];
}
- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data
{
//接收到服务器发送的数据
NSLog(@"服务器发送数据");
//每次接收到数据的时候都把数据拼接起来
[self.receiveData appendData:data];
}
- (void)connectionDidFinishLoading:(NSURLConnection *)connection
{
//接收数据完成
NSLog(@"数据接收完毕");
//数据请求完毕,对data进行解析
NSDictionary *dic = [NSJSONSerialization JSONObjectWithData:self.receiveData options:NSJSONReadingMutableContainers error:nil];
NSLog(@"%@",dic);
}
- (IBAction)buttonBlock:(id)sender {
//1.创建请求
NSString *str = @"http://api.douban.com/v2/movie/nowplaying?app_name=doubanmovie&client=e:iPhone4,1|y:iPhoneOS_6.1|s:mobile|f:doubanmovie_2|v:3.3.1|m:PP_market|udid:aa1b815b8a4d1e961347304e74b9f9593d95e1c5&alt=json&version=2&start=0&city=北京&apikey=0df993c66c0c636e29ecbb5344252a4a";
NSString *newStr = [str stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding];
NSURL *url = [NSURL URLWithString:newStr];
NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url cachePolicy:NSURLRequestUseProtocolCachePolicy timeoutInterval:60];
request.HTTPMethod = @"get";
//2.连接服务器
//参数1:请求 参数2:请求结束后,返回到哪个线程继续执行任务 参数3:请求结束,执行block中的代码
[NSURLConnection sendAsynchronousRequest:request queue:[NSOperationQueue mainQueue] completionHandler:^(NSURLResponse *response, NSData *data, NSError *connectionError) {
//data是完整的请求完毕的数据
if (data != nil) { //对data的一个判断...
NSDictionary *dic = [NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingMutableContainers error:nil];
NSLog(@"%@",dic);
}
}];
}
@end
