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我在以下代码中收到 MalformedURLexception，我不知道是什么原因造成的。

public void down(String url)
    {     try {
        URL url1 = new URL(url);


        HttpURLConnection urlConnection = (HttpURLConnection) url1.openConnection();
        urlConnection.setRequestMethod("GET");
        urlConnection.setDoOutput(true);
        urlConnection.connect();   
        File SDCardRoot = Environment.getExternalStorageDirectory();
        //create a new file, specifying the path, and the filename
        //which we want to save the file as.
        File file = new File(SDCardRoot,"somefile.ext");


        FileOutputStream fileOutput = new FileOutputStream(file);

        InputStream inputStream = urlConnection.getInputStream();

        int totalSize = urlConnection.getContentLength();
        int downloadedSize = 0;

        byte[] buffer = new byte[1024];
        int bufferLength = 0; //used to store a temporary size of the buffer

        while ( (bufferLength = inputStream.read(buffer)) > 0 ) {

                fileOutput.write(buffer, 0, bufferLength);
                //add up the size so we know how much is downloaded
                downloadedSize += bufferLength;
                //report progress


        }

        fileOutput.close();


    } catch (MalformedURLException e) {
        e.printStackTrace();
    } catch (IOException e) {
        e.printStackTrace();

    }
    }
}

它说未知协议。在读取部分出现之前，连接完全正常，在此之前代码甚至可以打印文件的正确大小。我尝试下载的文件也有一个类似 http://download12.aomethin.com/blaa-blaa的 url 如果我尝试添加 www，请求开始重定向。虽然我认为这可能是一个菜鸟，但我也想知道如何获取此文件的名称并使用该名称而不是我选择的名称保存文件。

编辑：程序现在正在运行我只需要知道如何获得文件的正确名称。并使其成为后台进程。

4

1 回答 1

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在主线程上下载不是一个好习惯；你应该在一个新线程上实现它；因为在下载时，主线程正忙于下载文件。如果等待时间超过预期，系统将生成“未响应”错误。

为此，您可以使用“ TaskAsync ”或“ IntentService ”，甚至创建一个新线程。不过，我建议 [ TaskAsync ] 因为它很容易实现。

这是自己设置文件名的好习惯：

public void downloadClicked() {
    InputStream in = null;
    FileOutputStream f = null;      
    try {
        String path ="ftp://administrator:password@131.164.140.118:21/MyShedule.zip";
        String targetFileName = "MyShedule.zip";

        URL u = new URL(path);
        URLConnection c =  u.openConnection();         

        c.setDoOutput(true);
        c.connect();
        String string = Environment.getExternalStorageDirectory().getPath().toString();

        in = c.getInputStream();

        f = new FileOutputStream(new File(string +"/kidsLibrary/"+ targetFileName));

        IOUtils.copy(in, f);

        } catch (MalformedURLException e) {
            Toast.makeText(KidsLibrary.this, e.toString(), Toast.LENGTH_LONG)
            .show();            
        } catch (ProtocolException e) {         
            Toast.makeText(KidsLibrary.this, e.toString(), Toast.LENGTH_LONG)
            .show();
        } catch (FileNotFoundException e) {        
            Toast.makeText(KidsLibrary.this, e.toString(), Toast.LENGTH_LONG)
            .show();
        } catch (IOException e) {           
            Toast.makeText(KidsLibrary.this, e.toString(), Toast.LENGTH_LONG)
            .show();
    } finally {
          IOUtils.closeQuietly(in);
          IOUtils.closeQuietly(f);
        }   
}
于 2012-11-03T19:27:44.663 回答