戴维营教育代码
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//HTTP/HTTPS
        //URL: [url]http://pic.baike.soso.com/p/20120424/bki-20120424022918-1539307851.jpg[/url]
         
        //创建一个URL对象
        var url = NSURL(string: "http://pic.baike.soso.com/p/20120424/bki-20120424022918-1539307851.jpg")
        //创建一个HTTP请求
        var request = NSURLRequest(URL: url)
        //发送同步请求，开始下载数据
         
        var response: NSURLResponse?
        var error: NSError?
        var data = NSURLConnection.sendSynchronousRequest(request, returningResponse: &response, error: &error)
        println("\(response):\(error)")
         
        var httpResponse = response as NSHTTPURLResponse
        //数据下载完成
        if httpResponse.statusCode == 200 {
            println("下载了\(data.length)字节")
            data.writeToFile("/Users/cheetah/Desktop/test.jpg", atomically: true)
        }
        else {
            println("下载失败: \(httpResponse.statusCode)")
        }