Android中的Apache HttpClient下载附件极慢 [英] Apache HttpClient in Android extremely slow downloading attachment

问题描述

我正在尝试使用 HttpCLient 4 下载一个 zip 文件，它的速度约为 0.5(千字节/千位)?每分钟.该文件小于 1 MB，下载可能需要一个小时！难道我做错了什么?我还应该怎么做?这是我目前的实现:

I am trying to download a zip file using HttpCLient 4 and it is going at around .5 (kilobytes/kilobits)? per minute. The file is less than a MB large, and the download will probably take an hour! Am I doing something wrong? How else should I do this? Here is my current implementation:

@Override
            protected Uri doInBackground(String... params) {
                publishProgress("Downloading...");  
                try {
                        HttpPost searchPOST = new HttpPost("http://www.somesite.com/" + searchResult.getURLSuffix());
                        List<NameValuePair> formparams = new ArrayList<NameValuePair>();
                        //added parameters here...
                        UrlEncodedFormEntity paramsEntity = new UrlEncodedFormEntity(formparams, HTTP.UTF_8);
                        searchPOST.setEntity(paramsEntity);


                HttpResponse manualResponse = client.execute(searchPOST);

                Header fileNameHeader = manualResponse.getFirstHeader("Content-Disposition");
                Pattern p = Pattern.compile("filename=\"(.+?)\"");
                Matcher m = p.matcher(fileNameHeader.getValue());

                if (m.find()) {
                    String fileName = m.group(1);
                    InputStream zipStream = manualResponse.getEntity().getContent();
                    File cacheDir = context.getCacheDir();
                    String tempFileForZip = cacheDir.getAbsolutePath() + "/" + fileName;
                    FileOutputStream fos = new FileOutputStream(tempFileForZip);
                    int bytesDownloaded = 0;
                    try {
                        int c;
                        while ((c = zipStream.read()) != -1) {
                            fos.write(c);
                            bytesDownloaded++;
                            kilobytesDownloaded=(bytesDownloaded / 1000);
                            publishProgress((String[])null);
                        }
                    } finally {
                        if (zipStream != null) {
                            zipStream.close();
                        }
                        if (fos != null) {
                            fos.close();
                        }
                    }

                    fos.close();


                String zipFilePath = tempFileForZip;

                //Change to indeterminate
                kilobytesDownloaded = fileSize;
                publishProgress("Extracting...");

                //TODO: Preferences for save directory
                saveDirectory = new File(Environment.getExternalStorageDirectory().getAbsolutePath() + "/" + "Downloads/");
                ZipTools.unzipArchive(new File(zipFilePath), saveDirectory);

                }

                    } catch (IllegalStateException e) {
                        // TODO Auto-generated catch block
                        e.printStackTrace();
                    } catch (IOException e) {
                        // TODO Auto-generated catch block
                        e.printStackTrace();
                    } finally {

                    }

                return Uri.fromFile(saveDirectory);
         }

推荐答案

第 1 步:不要为每个字节调用 publishProgress().

Step #1: Do not call publishProgress() for every byte.

第 2 步:一次读取一个以上的字节.更好的是，不要直接使用 InputStream -- 使用 HttpEntity#writeTo() 让 HttpClient 将您的数据写入输出文件.

Step #2: Read more than a byte at a time. Better yet, don't use the InputStream directly -- use HttpEntity#writeTo() to have HttpClient write your data to the output file.

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