急 java 使用DefaultHttpClient 发送post请求问题 求大神指点

public class HttpPos {
public static void main(String[] args) throws ClientProtocolException, IOException {
        try {
            DefaultHttpClient httpclient = new DefaultHttpClient();            httpclient.getCredentialsProvider().setCredentials(
                    new AuthScope(AuthScope.ANY_HOST, AuthScope.ANY_PORT), 
                    new UsernamePasswordCredentials("admin@internal", "111111"));
            HttpPost httppost = new HttpPost("http://192.168.8.66:8080/api/vms/f2fb2529-cddb-4fde-ab16-6cc5ee0eb9c5/start");
            httppost.setHeader("Content-Type", "application/xml");
            System.out.println("executing request " + httppost.getRequestLine());
            HttpResponse response;
            response = httpclient.execute(httppost);
            HttpEntity entity = response.getEntity();
            httppost.setEntity(entity);
            System.out.println(response.getStatusLine().getStatusCode());
            System.out.println("----------------------------------------");
            System.out.println(response.getStatusLine());
            if (entity != null) {
                System.out.println("Response content length: " + entity.getContentLength());
            }
            httpclient.getConnectionManager().shutdown();  
        } catch (ClientProtocolException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
}
}