RestTemplate 乱码

public static ResponseBean getByPostData(String url,Map<String,Object> params) throws ClientProtocolException,
      URISyntaxException, IOException {
   RestTemplate restTemplate = new RestTemplate();
       HttpHeaders headers = new HttpHeaders();
       headers.add("Content-Type", "application/x-www-form-urlencoded");
   MultiValueMap<String, Object> requestEntity = new LinkedMultiValueMap<>();
   for (String key:params.keySet()) {
      requestEntity.add(key,params.get(key).toString());
   }
       HttpEntity<MultiValueMap<String, Object>> r = new HttpEntity<>(
               requestEntity, headers);
       ResponseBean rspMsg =  restTemplate.postForObject(url,r , ResponseBean.class);
   return rspMsg;

}