在Android中发送大型post param

如何在Android中发送一个大的(>5MB)post参数(以及其他post参数)?

我正在使用 org.apache.http.client.methods.HttpPost 以及 BasicNameValuePair 发送后参数。

 HttpClient httpclient = new DefaultHttpClient();
 HttpPost httppost = new HttpPost(someURL);
 List<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>();
 nameValuePairs.add(new BasicNameValuePair("param1", "value1"));
 nameValuePairs.add(new BasicNameValuePair("param2", hugeValue));
 httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs));
 httpclient.execute(httppost);

hugeValue 是一个非常大的字符串,我想从 InputStream 我读的时候就发。我该怎么做?