网络&热恋NSURLConnection代理及GET￥POST请求

1.NSURLConnection代理下载设置在本地的身骑着白马MP3

 - (void)viewDidLoad {
     [super viewDidLoad];
     // Do any additional setup after loading the view, typically from a nib.

     self.data = [NSMutableData data];

     NSString * urlString = @"http://localhost/身骑白马.mp3";

     //如果接口中有中文
     urlString = [urlString stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding];

     NSURL * url = [NSURL URLWithString:urlString];

     NSURLRequest * request = [NSURLRequest requestWithURL:url];

     NSURLConnection * connect = [NSURLConnection connectionWithRequest:request delegate:self];

     //开启网络连接
     [connect start];
 }

 //服务器返回响应信息
 - (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response {

     NSLog(@"%@",response);

 }

 //接受数据（多次调用）
 - (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data {

     [self.data appendData:data];
     NSLog(@"%@",data);

 }

 //请求完成
 - (void)connectionDidFinishLoading:(NSURLConnection *)connection{

     [self.data writeToFile:@"/Users/mac/Desktop/身骑白马.mp3" atomically:YES];
     NSLog(@"网络请求完成");

 }

2.GET请求

#import "ViewController.h"

@interface ViewController ()

@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];

    //使用get请求，获取接口

    NSString * String = @"http://localhost/login.php";

    //拼接参数
    NSString * urlString = [NSString stringWithFormat:@"%@?username=xubaoaichiyu&password=123456",String];

    //如果有中文进行转码

    urlString = [urlString stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding];

    NSURL * url = [NSURL URLWithString:urlString];

    NSURLRequest * request = [[NSURLRequest alloc]initWithURL:url cachePolicy: timeoutInterval:];

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

        NSString * string = [[NSString alloc]initWithData:data encoding:NSUTF8StringEncoding];

        NSLog(@"%@",string);

    }];

}

@end

3.POST请求

#import "ViewController.h"

@interface ViewController ()

@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];

    //使用post请求
    //获取接口
    NSString * string = @"http://localhost/login.php";

    //中文转码
    string = [string stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding];

    NSURL * url = [NSURL URLWithString:string];

    //可变请求
    NSMutableURLRequest * requst = [[NSMutableURLRequest alloc]initWithURL:url cachePolicy: timeoutInterval:];

    //设置传输方式

    requst.HTTPMethod = @"POST";

    NSString * bodyString = [NSString stringWithFormat:@"username=xubaoaichiyu&password=123456"];

    //设置请求体

    requst.HTTPBody = [bodyString dataUsingEncoding:NSUTF8StringEncoding];

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

        NSString * string = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];

        NSLog(@"%@",string);

    }];

}