Android文件下载

public class FileDownloadUtils {private String sdPath;public FileDownloadUtils() {sdPath = Environment.getExternalStorageState() + "/";}/*** 在SD卡上创建文件** @param fileName* @return* @throws IOException*/public File createSDFile(String fileName) throws IOException {File file = new File(sdPath + fileName);file.createNewFile();return file;}/*** 在SD卡上创建目录** @param dirName* @return*/public File createSDDir(String dirName) {File dir = new File(sdPath + dirName);dir.mkdirs();return dir;}/*** 判断SD卡上的文件夹是否存在** @param fileName* @return*/public boolean isFileExist(String fileName) {File file = new File(sdPath + fileName);return file.exists();}/*** 将一个InputStream里面的数据写入到SD卡中** @param path* @param fileName* @param inputStream* @return*/public File write2SDFromInput(String path, String fileName, InputStream inputStream) {File file = null;OutputStream outputStream = null;try {createSDDir(path);file = createSDFile(path + fileName);outputStream = new FileOutputStream(file);byte[] buffer = new byte[4 * 1024];while ((inputStream.read(buffer)) != -1) {outputStream.write(buffer);}outputStream.flush();} catch (Exception e) {e.printStackTrace();} finally {try {outputStream.close();} catch (Exception e) {e.printStackTrace();}}return file;}public String getSdPath() {return sdPath;}public void setSdPath(String sdPath) {this.sdPath = sdPath;}
}

public class HttpDownloader {URL url = null;public String download(String urlStr) {StringBuilder sb = new StringBuilder();String line = null;BufferedReader br = null;try {url = new URL(urlStr);HttpURLConnection httpURLConnection = (HttpURLConnection) url.openConnection();br = new BufferedReader(new InputStreamReader(httpURLConnection.getInputStream()));while ((line = br.readLine()) != null) {sb.append(line);}} catch (Exception e) {e.printStackTrace();} finally {try {br.close();} catch (Exception e) {e.printStackTrace();}}return sb.toString();}/*** 该函数返回整形 -1：代表下载文件出错   0：代表下载文件成功   1：代表文件已经存在** @param urlStr* @param path* @param fileName* @return*/public int downFile(String urlStr, String path, String fileName) {InputStream inputStream = null;try {FileDownloadUtils fileDownloadUtils = new FileDownloadUtils();if (fileDownloadUtils.isFileExist(path + fileName)) {return 1;} else {inputStream = getInputStreamFromUrl(urlStr);File resultFile = fileDownloadUtils.write2SDFromInput(path, fileName, inputStream);if (resultFile == null) {return -1;}}} catch (Exception e) {e.printStackTrace();} finally {try {inputStream.close();} catch (Exception e) {e.printStackTrace();}}return 0;}/*** 根据URL得到输入流** @param urlStr* @return* @throws MalformedURLException* @throws IOException*/public InputStream getInputStreamFromUrl(String urlStr) throws MalformedURLException, IOException {url = new URL(urlStr);HttpURLConnection httpURLConnection = (HttpURLConnection) url.openConnection();InputStream inputStream = httpURLConnection.getInputStream();return inputStream;}}

在Activity使用：

@Overridepublic void onClick(View v) {DownloadFileThread downloadFileThread = new DownloadFileThread(downloadUrl, FileUtil.getSDCardPath(), "html.zip");downloadFileThread.start();}@SuppressLint("HandlerLeak")private final Handler mHandler = new Handler() {@Overridepublic void handleMessage(@NonNull Message msg) {if (msg.what == -1) {Toast.makeText(FileOperateActivity.this, "下载文件出错", Toast.LENGTH_SHORT).show();Log.e(TAG, "下载文件出错");} else if (msg.what == 0) {Toast.makeText(FileOperateActivity.this, "下载文件成功", Toast.LENGTH_SHORT).show();Log.e(TAG, "下载文件成功");} else if (msg.what == 1) {Toast.makeText(FileOperateActivity.this, "代表文件已经存在", Toast.LENGTH_SHORT).show();Log.e(TAG, "代表文件已经存在");}}};class DownloadFileThread extends Thread {private final String download_file_url;private final String download_file_path;private final String download_file_fileName;public DownloadFileThread(String download_file_url, String download_file_path, String download_file_fileName) {this.download_file_url = download_file_url;this.download_file_path = download_file_path;this.download_file_fileName = download_file_fileName;}@Overridepublic void run() {HttpDownloader httpDownloader = new HttpDownloader();int result = httpDownloader.downFile(download_file_url, download_file_path, download_file_fileName);Message message = new Message();message.what = result;mHandler.sendMessage(message);}}

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