怎么使用httpclient中的put方法上传大文件?
如果是一次性读到内存中发送的话，内存很容易撑爆，所以肯定是用边读边发的方式，或者使用分片上传。现在想知道怎么使用httpclient实现边读边传，使用jdk自带的方法已经知道怎么实现了。

    public static void putRequest(String uri, Map<String, String> headers, File file)
    {
        URLConnection urlconnection = null;
        BufferedOutputStream bos = null;
        BufferedInputStream bis = null;
        
        try
        {
            URL url = new URL(uri);
            urlconnection = url.openConnection();
            urlconnection.setDoOutput(true);
            urlconnection.setDoInput(true);

            if (urlconnection instanceof HttpURLConnection)
            {
                try
                {
                    ((HttpURLConnection) urlconnection).setRequestMethod("PUT");
                    for(Map.Entry<String, String> entry : headers.entrySet())
                    {
                        ((HttpURLConnection) urlconnection).setRequestProperty(entry.getKey(), entry.getValue());
                    }
                    ((HttpURLConnection) urlconnection).connect();

                }
                catch (ProtocolException e)
                {
                    e.printStackTrace();
                }
            }

            bos = new BufferedOutputStream(urlconnection.getOutputStream());
            bis = new BufferedInputStream(new FileInputStream(file));
            
            byte[] buff = new byte[1024 * 8];
            int i;
            while ((i = bis.read(buff)) != -1)
            {
                bos.write(buff, 0, i);
            }
            System.out.println(((HttpURLConnection) urlconnection).getResponseMessage());
        }
        catch (Exception e)
        {
            e.printStackTrace();
        }
        finally
        {
            IOUtils.closeQuietly(bis);
            IOUtils.closeQuietly(bos);
            ((HttpURLConnection) urlconnection).disconnect();
        }
    }