下载PDF文件并保存到SD卡 [英] Downloading pdf file and saving to SD card

问题描述

我想pdf文件下载并保存到内部存储。这里是code，我现在用：

I want to download and save pdf file to internal storage. Here is code that i am using:

我是从其他类调用我的方法：

I am calling my method from other class:

new Thread(new Runnable() {
    public void run() {

        new Main().downloadPdfContent("http://people.opera.com/howcome/2005/ala/sample.pdf");

    }
  }).start();

方法是这样的：

public void downloadPdfContent(String urlToDownload){

    URLConnection urlConnection = null;

    try{

        URL url = new URL(urlToDownload);

        //Opening connection of currrent url

        urlConnection = url.openConnection();
        urlConnection.connect();

        //int lenghtOfFile = urlConnection.getContentLength();


    String PATH = Environment.getExternalStorageDirectory() + "/1/";

    File file = new File(PATH);
    file.mkdirs();
    File outputFile = new File(file, "test.pdf");
    FileOutputStream fos = new FileOutputStream(outputFile);

    InputStream is = url.openStream();


    byte[] buffer = new byte[1024];

    int len1 = 0;

    while ((len1 = is.read(buffer)) != -1) {
        fos.write(buffer, 0, len1);
    }

    fos.close();
    is.close();

   System.out.println("--pdf downloaded--ok--"+urlToDownload);

    }catch (Exception e) {
        // TODO: handle exception
        e.printStackTrace();

    }

}

我在网上找到了PDF格式的链接：
http://people.opera.com/howcome/2005/ala/sample.pdf

不过，我在这条线得到一个异常：

However i get an exception on this line:

urlConnection.connect（）;

例外：
的java.net.UnknownHostException：people.opera.com

我无法弄清楚什么是错的。也许有人可以看看。

I can't figure out what's wrong. Maybe someone could take a look.

感谢。

推荐答案

将

    <uses-permission android:name="android.permission.INTERNET"/>

在你的Andr​​oidManifest.xml

in your AndroidManifest.xml

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