利用ASIHttp实现文件的下载、上传和网络状态的监控

第一、设置下载路径

    NSString *string=@"http://free2.macx.cn:81/tools/system/CleanMyMac-v1-10-8.dmg";

    NSString *document=[NSHomeDirectory()stringByAppendingString:@"document"];

    NSString *path=[documentstringByAppendingString:[stringlastPathComponent]];

    ASIHTTPRequest *request=[ASIHTTPRequestrequestWithURL:[NSURLURLWithString:string]];

    request.delegate=self;

第二、开始下载

    [request setDownloadDestinationPath:path];

//下载代理进度条，还有上传代理进度条

    request.downloadProgressDelegate=progressView;

    [request startAsynchronous];

 第三、利用block方法获取文件的大小

    [request setHeadersReceivedBlock:^(NSDictionary *responseHeaders){

        //响应头

        NSLog(@"the length is %@",[responseHeadersobjectForKey:@"Content-Length"]);

    }];

第四、获取下载进度

//通过kvo监听进度条

    [progressView addObserver:selfforKeyPath:@"progress"options:NSKeyValueObservingOptionNewcontext:nil];

-(void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary *)change context:(void *)context

    {

        NSLog(@"%@",change);

        NSNumber *num=[changeobjectForKey:@"new"];

        

        float progress=[num floatValue];

        NSLog(@"the len is %f %%",progress*100);

    }

第五、网络状态的监控

@property (nonatomic,retain)Reachability *reachAble;

//添加通知

    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(reachStatusChanged:) name:kReachabilityChangedNotification object:nil];

    self.reachAble=[Reachability reachabilityForInternetConnection];

//当网络状态发生改变时调用此函数

-(void)reachStatusChanged:(NSNotification *)notification

{

    NetworkStatus status=self.reachAble.currentReachabilityStatus;

    [self checkNetWork:status];

}

//网络状态的三种表示

kNotReachable：表示没有网络

kReachableViaWWAN：表示2G/3G

kReachableViaWIFI:标示WIFI

    -(void)checkNetWork:(NetworkStatus) status

    {

        if (status==kNotReachable) {

            NSLog(@"没有网络");

        }else if (status==kReachableViaWWAN)

        {

            NSLog(@"2G/3G");

        } else{

            NSLog(@"WIFI");

        }

    }

第六、上传文件

NSString *a = @"http://www.****.php";
    NSURL *url = [NSURL URLWithString:a];
    ASIFormDataRequest *request = [ASIFormDataRequest requestWithURL:url];
    [request setDelegate:self];
    [request startAsynchronous];
    [request setFile:file forKey:@"photo"];

    //------------------------断点续传-----------------------

    //设置是否支持断点续传

    [request setAllowResumeForFileDownloads:YES];

    NSString *tempPath = [NSHomeDirectory()stringByAppendingPathComponent:@"tmp/cache.download"];

    //设置下载过程中暂存的文件路径

    [request setTemporaryFileDownloadPath:tempPath];

    [request startAsynchronous];