网络数据请求
#import "ViewController.h"
@interface ViewController ()//用来拼接data
@property(nonatomic,strong)NSMutableData *totadata;
//storybod的四个button
- (IBAction)getaction:(UIButton *)sender;
- (IBAction)postaction:(UIButton *)sender;
- (IBAction)delegateaction:(UIButton *)sender;
- (IBAction)blockaction:(UIButton *)sender;
@end
@implementation ViewController
- (void)viewDidLoad {
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
}
- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
#pragma mark
//建立同步请求 get请求
- (IBAction)getaction:(UIButton *)sender {
//1.封装网址对象
NSString *urlstring=@"http://ipad-bjwb.bjd.com.cn/DigitalPublication/publish/Handler/APINewsList.ashx?date=20131129&startRecord=1&len=5&udid=1234567890&terminalType=Iphone&cid=213";
NSURL *url =[NSURL URLWithString:urlstring];
//2.设置网络请求
// NSMutableURLRequest *request =[NSMutableURLRequest requestWithURL:url];
// [request setHTTPMethod:@"GET"];//设置网络请求方式 get或者post 默认是GET (如果不设置就是默认)
NSURLRequest *request =[NSURLRequest requestWithURL:url cachePolicy:NSURLRequestUseProtocolCachePolicy timeoutInterval:10];
//3.连接服务器发送请求
NSData *date =[NSURLConnection sendSynchronousRequest:request returningResponse:nil error:nil];
NSString *resultstring =[[NSString alloc]initWithData:date encoding:NSUTF8StringEncoding];
NSLog(@"%@",resultstring);
/* NSURLRequest 初始化方法第一个参数:请求访问路径的,第二个参数缓存协议,第三个参数网络请求超时时间(s秒)
其中缓存协议是个枚举类型
NSURLRequestUseProtocolCachePolicy = 0, (基础策略)
NSURLRequestReloadIgnoringLocalCacheData = 1, (忽略本地缓存)
NSURLRequestReturnCacheDataElseLoad = 2, (首先使用缓存,如果没有再去请求)
NSURLRequestReturnCacheDataDontLoad = 3, (使用本地缓存也不去下载,如果没有本地缓存,也不去再请求.多用于离线操作)
NSURLRequestReloadIgnoringLocalAndRemoteCacheData = 4, // Unimplemented(无视任何缓存策略,无论是本地还是远程的,都要去请求数据)
NSURLRequestReloadIgnoringCacheData = NSURLRequestReloadIgnoringLocalCacheData,
NSURLRequestReloadRevalidatingCacheData=5(如果本地缓存是有效的则不下载,否则都是从服务器重新下载)*/
}
#pragma mark post
//建立同步post请求
- (IBAction)postaction:(UIButton *)sender {
//1.封装网址对象
NSString *urlstring =@"http://ipad-bjwb.bjd.com.cn/DigitalPublication/publish/Handler/APINewsList.ashx";
NSURL *url =[NSURL URLWithString:urlstring];
//2.设置网络请求post
NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url];
[request setHTTPMethod:@"POST"];
//3.设置参数
NSString *poststring =@"date=20131129&startRecord=1&len=5&udid=1234567890&terminalType=Iphone&cid=213";
NSData *postdata =[poststring dataUsingEncoding:NSUTF8StringEncoding];
[request setHTTPBody:postdata];
//4.建立同步请求,请求数据
NSData *data =[NSURLConnection sendSynchronousRequest:request returningResponse:nil error:nil];
NSString *resultstring =[[NSString alloc]initWithData:data encoding:NSUTF8StringEncoding];
NSLog(@"%@",resultstring);
}
#pragma mark ----nsurlconectiondatadelegate-----
//服务器开始响应,准备开始返回数据
-(void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response{
}
//客户端接收数据
-(void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data{
self.totadata =[NSMutableData data];
//可变data的拼接方法
[self.totadata appendData:data];
}
//数据接收完成
-(void)connectionDidFinishLoading:(NSURLConnection *)connection{
NSString *string =[[NSString alloc]initWithData:self.totadata encoding:NSUTF8StringEncoding];
NSLog(@"%@",string);
}
//错误提示,连接失败
-(void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error{
NSLog(@"%@",error);//一般是网络问题或者是服务器问题造成的
}
//代理实现异步
- (IBAction)delegateaction:(UIButton *)sender {
NSString *urlstring =@"http://ipad-bjwb.bjd.com.cn/DigitalPublication/publish/Handler/APINewsList.ashx?date=20131129&startRecord=1&len=5&udid=1234567890&terminalType=Iphone&cid=213";
NSURL *url =[NSURL URLWithString:urlstring];
//2.
//NSMutableURLRequest *request =[NSMutableURLRequest requestWithURL:url];
NSURLRequest *request =[NSURLRequest requestWithURL:url cachePolicy:NSURLRequestUseProtocolCachePolicy timeoutInterval:10];
//3建立同步连接
NSURLConnection *connection= [NSURLConnection connectionWithRequest:request delegate:self];
}
// 异步请求
- (IBAction)blockaction:(UIButton *)sender {
NSString *urlstring=@"http://ipad-bjwb.bjd.com.cn/DigitalPublication/publish/Handler/APINewsList.ashx?date=20131129&startRecord=1&len=5&udid=1234567890&terminalType=Iphone&cid=213";
NSURL *url =[NSURL URLWithString:urlstring];
//2.
NSMutableURLRequest *request =[NSMutableURLRequest requestWithURL:url];
//3.
[NSURLConnection sendAsynchronousRequest:request queue:[NSOperationQueue mainQueue] completionHandler:^(NSURLResponse * _Nullable response, NSData * _Nullable data, NSError * _Nullable connectionError) {
NSString *resultstring =[[NSString alloc]initWithData:data encoding:NSUTF8StringEncoding];
NSLog(@"%@",resultstring);
}];
}
@end
