android download file and save to sdCard

方法一：

public void DownloadFromUrl(String DownloadUrl, String fileName) {

try {
File root = android.os.Environment.getExternalStorageDirectory();

File dir = new File (root.getAbsolutePath() + "/xmls");
if(dir.exists()==false) {
dir.mkdirs();
}

URL url = new URL(DownloadUrl); //you can write here any link
File file = new File(dir, fileName);

long startTime = System.currentTimeMillis();
Log.d("DownloadManager", "download begining");
Log.d("DownloadManager", "download url:" + url);
Log.d("DownloadManager", "downloaded file name:" + fileName);

/* Open a connection to that URL. */
URLConnection ucon = url.openConnection();

/*
* Define InputStreams to read from the URLConnection.
*/
InputStream is = ucon.getInputStream();
BufferedInputStream bis = new BufferedInputStream(is);

/*
* Read bytes to the Buffer until there is nothing more to read(-1).
*/
ByteArrayBuffer baf = new ByteArrayBuffer(5000);
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.flush();
fos.close();
Log.d("DownloadManager", "download ready in" + ((System.currentTimeMillis() - startTime) / 1000) + " sec");

} catch (IOException e) {
e.printStackTrace();
Log.d("DownloadManager", "Error: " + e);
}

}

方法二：

protected void download() {
File root = Environment.getExternalStorageDirectory();
File file = new File(root, "myPDF" + ".pdf");
String content = null;
try {
if (root.canWrite()) {

String[] paramterNames = new String[1];
String[] paramterValues = new String[1];
paramterNames[0] = "respFormat";
paramterValues[0] = "pdf";
URL url = new URL(uri);

try {

// Read the PDF from the URL and save to
// a local file
BufferedInputStream bis = new BufferedInputStream(
url.openStream());
BufferedOutputStream bos = new BufferedOutputStream(
new FileOutputStream(file));
byte[] buff = new byte[2048];
int bytesRead;
// Simple read/write loop.
while (-1 != (bytesRead = bis.read(buff, 0, buff.length))) {
bos.write(buff, 0, bytesRead);
}
bos.flush();
bos.close();
bis.close();

} catch (NullPointerException npe) {
System.out.println("FAILED.\n[" + npe.getMessage() + "]\n");
}

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

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