[英]Apache HttpUtils Download a File
我正在使用以下代码下载文件并计算长度,但返回值(长度)始终为-1
private long getContentLength(String url) {
HttpGet httpGet = new HttpGet(url);
HttpResponse httpResponse;
try {
httpResponse = httpClient.execute(httpGet);
} catch (Exception ex) {
logException(ex);
return -1;
}
HttpEntity httpEntity = httpResponse.getEntity();
if (httpEntity == null)
return -1;
System.out.println("Content length was: " + httpEntity.getContentLength() + " and code: " + httpResponse.getStatusLine().getStatusCode());
return httpEntity.getContentLength();
}
正在下载的文件:
boolean download100MBFile() {
getContentLength("http://cachefly.cachefly.net/100mb.test");
return true;
}
HTTP响应代码为:200
该文件是从浏览器下载的,因此该文件没有问题。 这是怎么了?
维克多(Victor)的评论激发了我使用流媒体的功能。 这是有效的更新代码:
private long getContentLength(String url) {
outputStream.reset();
HttpGet httpGet = new HttpGet(url);
HttpResponse httpResponse;
try {
httpResponse = httpClient.execute(httpGet);
} catch (Exception ex) {
logException(ex);
return -1;
}
HttpEntity httpEntity = httpResponse.getEntity();
if (httpEntity == null)
return -1;
ByteArrayOutputStream outStream = new ByteArrayOutputStream(1024 * 1024 * 1024);
try {
httpEntity.writeTo(outStream);
} catch (IOException ex) {
logException(ex);
return -1;
}
return outStream.size();
}
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