NSURLConnection获取一个MP3文件

NSURLConnection网络请求

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