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:0 timeoutInterval:15];
    
    [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:0 timeoutInterval:15];
    
    //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);
        
    }];
    
}