如何使用HttpPost发送日文字符

我正在尝试将日文字符发送到我的API服务器,但发送的字符是乱码并且变成了????.所以我使用以下方法将编码设置为实体:

    StringEntity stringEntity = new StringEntity(message, "UTF-8");

但输出成了org.apache.http.entity.StringEntity@4316f850.我想知道是否转换stringEntity为字符串导致了这个,因为我想在我的服务器中发送它String.

这是我如何使用它:

public static String postSendMessage(String path, String message) throws Exception {
    DefaultHttpClient httpClient = new DefaultHttpClient();
    HttpConnectionParams.setConnectionTimeout(httpClient.getParams(), 10000); // Timeout limit
    HttpPost httpPost = new HttpPost(SystemInfo.getApiUrl() + path);
    List value = new ArrayList();

    StringEntity stringEntity = new StringEntity(message, "UTF-8");
    value.add(new BasicNameValuePair("message", stringEntity.toString())); //Here's where I converted the stringEntity to string

    UrlEncodedFormEntity entity = new UrlEncodedFormEntity(value);
    httpPost.setEntity(entity);
    HttpResponse httpResponse = httpClient.execute(httpPost);

    HttpEntity httpEntity = httpResponse.getEntity();
    InputStream is = httpEntity.getContent();

    String result = convertStreamToString(is);
    return result;
}

哪里可能出错了？