//urlList是遠端圖片地址，path是圖片下載後將要存放的地址

private static void downloadPicture(String urlList,String path) {
URL url = null;
try {
url = new URL(urlList);
DataInputStream dataInputStream = new DataInputStream(url.openStream());

FileOutputStream fileOutputStream = new FileOutputStream(new File(path));
ByteArrayOutputStream output = new ByteArrayOutputStream();

byte[] buffer = new byte[1024];
int length;

while ((length = dataInputStream.read(buffer)) > 0) {
output.write(buffer, 0, length);
}
fileOutputStream.write(output.toByteArray());
dataInputStream.close();
fileOutputStream.close();
} catch (MalformedURLException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}