从网络中下载文件,并且写入SDCARD根目录下,成功返回true，失败返回false

* 从网络中下载文件,并且写入SDCARD根目录下,成功返回true，失败返回false

*

* @return

*/

public boolean DownloadFile(String urlString) throws IOException {

InputStream inputStream = null;

try {

URL url = new URL(urlString);

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

inputStream = urlConnection.getInputStream();

targetFile = write2SDFromInput(SDPath, "a.jpg", inputStream);

if (targetFile == null)

return false;

} catch (Exception e) {

e.printStackTrace();

System.out.println(e);

} finally {

inputStream.close();

}

return true;

}

/**

* 把文件写入SDCARD

*

* @param path

* @param fileNameString

* @param inputStream

* @return

*/

public File write2SDFromInput(String path, String fileNameString, InputStream inputStream) {

File file = null;

OutputStream outputStream = null;

try {

file = new File(path, fileNameString);

outputStream = new FileOutputStream(file);

byte buffer[] = new byte[4 * 1024];

int temp;

while ((temp = inputStream.read(buffer)) != -1) {

outputStream.write(buffer, 0, temp);

}

outputStream.flush();

} catch (IOException e) {

e.printStackTrace();

} finally {

try {

outputStream.close();

} catch (Exception e2) {

e2.printStackTrace();

}

}

return file;

}