Android项目之文件下载

来源：互联网发布：网络优化培训费多少编辑：程序博客网时间：2024/04/19 11:27
public void run() {        synchronized (cancelLock) {            if(isCancel) {                return;            } else {                isRunning = true;            }        }        File file = new File(filePath);        ImageDownloadListener.DownloadResult downloadResult;        if(file.exists()) {            downloadResult = ImageDownloadListener.DownloadResult.FILE_EXISTS;        } else {            if(url == null || url.trim().equals("")) {                downloadResult = ImageDownloadListener.DownloadResult.URL_EMPTY;            } else {                OutputStream outputStream = null;                HttpURLConnection httpURLConnection = null;                try {                    httpURLConnection = (HttpURLConnection) new URL(url).openConnection();                    httpURLConnection.setConnectTimeout(5000);                    httpURLConnection.setReadTimeout(5000);                    httpURLConnection.setRequestMethod("GET");                    int responseCode = httpURLConnection.getResponseCode();                    if(responseCode == 200) {                        InputStream inputStream = httpURLConnection.getInputStream();                        synchronized (lock) {                            file.getParentFile().mkdirs();                            file.createNewFile();                        }                        outputStream = new FileOutputStream(file);                        byte[] buffer = new byte[1024];                        int length = -1;                        int totalSize = httpURLConnection.getContentLength();                        int currentSize = 0;                        long lastNotify = System.currentTimeMillis();                        while ((length = inputStream.read(buffer)) != -1) {                            outputStream.write(buffer, 0, length);                            currentSize += length;                            if((System.currentTimeMillis() - lastNotify) > 200) {                                new UiTaskProcess(totalSize, currentSize).execute();                                lastNotify = System.currentTimeMillis();                            }                        }//此处有陷阱  如果文件流为空                        outputStream.flush();                        new UiTaskProcess(totalSize, currentSize).execute();                        downloadResult = ImageDownloadListener.DownloadResult.SUCCESSFUL;                    } else {                        file.deleteOnExit();                        downloadResult = ImageDownloadListener.DownloadResult.FAILED;                    }                } catch (IOException e) {                    e.printStackTrace();                    if(outputStream != null)                        try {                            outputStream.flush();                        } catch (IOException e1) {                            e1.printStackTrace();                        }                    file.delete();                    downloadResult = ImageDownloadListener.DownloadResult.FAILED;                } finally {                    closeQuietly(outputStream);                    if(httpURLConnection != null)                        httpURLConnection.disconnect();                }            }            new UiTaskResult(downloadResult).execute();        }    }
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