本文介绍了Apache的HttpClient的Android中极其缓慢的下载附件的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我试图下载使用HttpClient的4，它会在大约.5 zip文件（千字节/千位）？每分钟。该文件是小于一个MB的大，并且下载可能会需要一个小时！难道我做错了什么？我应该怎么做别的呢？这是我目前的执行情况：
@覆盖
保护乌里doInBackground（字符串... PARAMS）{
publishProgress（下载...）;
尝试 {
HttpPost searchPOST =新HttpPost（http://www.somesite.com/+ searchResult.getURLSuffix（））;
名单＆LT;的NameValuePair＆GT; formparams =新的ArrayList＆LT;的NameValuePair＆GT;（）;
//这里添加的参数...
UrlEn codedFormEntity paramsEntity =新UrlEn codedFormEntity（formparams，HTTP.UTF_8）;
searchPOST.setEntity（paramsEntity）;
HTT presponse manualResponse = client.execute（searchPOST）;
头fileNameHeader = manualResponse.getFirstHeader（内容处置）;
模式p = Pattern.compile（文件名= \（+）\。）;
匹配器米= p.matcher（fileNameHeader.getValue（））;
如果（m.find（））{
字符串文件名= m.group（1）;
InputStream的zipStream = manualResponse.getEntity（）的getContent（）。
文件cacheDir = context.getCacheDir（）;
串tempFileForZip = cacheDir.getAbsolutePath（）+/+文件名;
FileOutputStream中FOS =新的FileOutputStream（tempFileForZip）;
INT bytesDownloaded = 0;
尝试 {
INT℃;
而（（C = zipStream.read（））！= - 1）{
fos.write（C）;
bytesDownloaded ++;
kilobytesDownloaded =（bytesDownloaded / 1000）;
publishProgress（（字符串[]）NULL）;
}
} 最后 {
如果（zipStream！= NULL）{
zipStream.close（）;
}
如果（FOS！= NULL）{
fos.close（）;
}
}
fos.close（）;
字符串zipFilePath = tempFileForZip;
//更改为不确定
kilobytesDownloaded =文件大小;
publishProgress（提取...）;
// TODO：preferences的保存目录
saveDirectory =新的文件（Environment.getExternalStorageDirectory（）getAbsolutePath（）+/+下载/）;
ZipTools.unzipArchive（新文件（zipFilePath），saveDirectory）;
}
}赶上（IllegalStateException异常E）{
// TODO自动生成的catch块
e.printStackTrace（）;
}赶上（IOException异常E）{
// TODO自动生成的catch块
e.printStackTrace（）;
} 最后 {
}
返回Uri.fromFile（saveDirectory）;
}
解决方案
步骤＃1：不要叫 publishProgress（）为每个字节
步骤＃2：了解更多比一个字节的时间。更重要的是，不要使用的InputStream 直接 - 使用 HttpEntity＃的writeTo（）有的HttpClient 您的数据写入到输出文件。
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);
}
解决方案
Step #1: Do not call publishProgress() for every byte.
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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