从URL中下载文件并保存到内存中磁盘的android [英] Download a file from url and save to memory disk android

问题描述

我试图从URL中下载文件并将其保存到内存车，但我不能明白什么是我的错，我的code是

I have tried to download a file from url and save it to memory cart, but I cant understand what is my wrong, my code is

URL url = new URL(imageURL);
        File file = new File(fileName);

        long startTime = System.currentTimeMillis();
        Log.d("ImageManager", "download begining");
        Log.d("ImageManager", "download url:" + url);
        Log.d("ImageManager", "downloaded file name:" + fileName);
        URLConnection ucon = url.openConnection();
        InputStream is = ucon.getInputStream();
        BufferedInputStream bis = new BufferedInputStream(is);

        ByteArrayBuffer baf = new ByteArrayBuffer(50);
        int current = 0;
        while ((current = bis.read()) != -1) {
           baf.append((byte) current);
        }

        /* Convert the Bytes read to a String. */
        FileOutputStream fos = new FileOutputStream(file);
        fos.write(baf.toByteArray());
        fos.close();
        Log.d("ImageManager", "download ready in"
                        + ((System.currentTimeMillis() - startTime) / 1000)
                        + " sec");

但我发现下面的错误在我的控制台

but i found the following error in my console

12-27 14:50:01.302: D/EXCEPTION GET:(8062): java.io.FileNotFoundException: /my.jpg (Read-only file system)

其实我不知道我能做些什么，任何人的帮助吧。

Actually i dont know what can i do, anyone help please.

推荐答案

问题是与你的路径保存文件，文件名不应该用 / 并启动此修改适用于您的code。

The problem is with your path to save the file , fileName shouldn't start with a / and apply this modification to your code .

File extStore = Environment.getExternalStorageDirectory();
File file = new File(extStore, fileName);

您应该检查介质的可用性保存。

这篇关于从URL中下载文件并保存到内存中磁盘的android的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！