NSURLConnection网络请求

• 直接上代码-这个没什么说的，你们自己有兴趣可以自己试试

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代码

#import "ViewController.h"

@interface ViewController ()<NSURLConnectionDataDelegate>

//一个可变的data，因为NSURLConnection代理方法下载数据是分段下的，不信大家可以试试

@property (nonatomic,strong) NSMutableData *data;

@end

@implementation ViewController

#pragma mark -getter and setter methods

- (NSMutableData *)data

{

    if (!_data) {

        _data = [NSMutableData data];

    }

    return _data;

}

- (void)viewDidLoad {

    [super viewDidLoad];

    // Do any additional setup after loading the view, typically from a nib.

    NSString *urlString = @"http://192.168.1.68/丁香花.mp3";

    //如果url中有中文，需要把它转换成百分比占位符

    urlString = [urlString stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding];

    NSURL *url = [NSURL URLWithString:urlString];

    //NSURLRequestUseProtocolCachePolicy 自动缓存策略

    // 超时时间 默认是60s 一般设置为10 - 30 秒之间

    NSURLRequest *requst = [NSURLRequest requestWithURL:url cachePolicy:NSURLRequestUseProtocolCachePolicy timeoutInterval:15];

    //建立连接 NSURLConnection需要手动开启

    NSURLConnection *connection = [[NSURLConnection alloc]initWithRequest:requst delegate:self];

    [connection start];

}

//服务器返回信息

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

{

    NSLog(@"%@",response);

}

// 客户端在服务器下载数据 - 数据一次只能下一点

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

{

    [self.data appendData:data];

    NSLog(@"%@",data);

}

//完成

- (void)connectionDidFinishLoading:(NSURLConnection *)connection

{

    [self.data writeToFile:@"/Users/mac/Desktop/丁香花.mp3" atomically:YES];

    NSLog(@"下载完成");

}

- (void)didReceiveMemoryWarning {

    [super didReceiveMemoryWarning];

    // Dispose of any resources that can be recreated.

}

@end