SpringBoot之RestTemplate在URL中转义字符的问题

Map<String, Object> param = new HashMap<String, Object>();
            param.put("version","2.0.0");
            String userSing = sign(param);
            param.put("user_sign", userSing);
            logger.info("签名:" + userSing);
            StringBuilder paramStr = new StringBuilder("?");
            for(Map.Entry<String, Object> entry : param.entrySet()){
                paramStr.append(entry.getKey()).append("=")
                        .append(entry.getValue() == null ? "" : String.valueOf(entry.getValue()))
                        .append("&");
            }
            paramStr.deleteCharAt(paramStr.length() - 1);
            logger.info("入参:" + paramStr.toString());
            RestTemplate restTemplate = new RestTemplate();
            String jsonStr = restTemplate.getForObject(sendMessagesUrl + paramStr.toString(), String.class);
            logger.info("响应值：" + jsonStr);

public class RestTemplateConfig {
    @Bean
    RestTemplate restTemplate() {
        SimpleClientHttpRequestFactory requestFactory = new SimpleClientHttpRequestFactory();
        requestFactory.setReadTimeout(40000);
        requestFactory.setConnectTimeout(40000);
        // 添加转换器
        List<HttpMessageConverter<?>> messageConverters = new ArrayList<>();
        messageConverters.add(new StringHttpMessageConverter(Charset.forName("UTF-8")));
        messageConverters.add(new FormHttpMessageConverter());
        messageConverters.add(new MappingJackson2HttpMessageConverter());
        RestTemplate restTemplate = new RestTemplate(messageConverters);
        restTemplate.setRequestFactory(requestFactory);
        restTemplate.setErrorHandler(new DefaultResponseErrorHandler());
        return restTemplate;
    }
}

Map<String, Object> param = new HashMap<String, Object>();
        StringBuilder paramStr = new StringBuilder("?");
            param.put("version","xxxxx");
            param.put("time","xxxxx");
            //转化成md5生产密钥
            String userSing  = sign(param);
            String userSign = URLEncoder.encode(userSing, "UTF-8");
            param.put("user_sign", userSign);
            for(Map.Entry<String, Object> entry : param.entrySet()){
                paramStr.append(entry.getKey()).append("=")
                        .append(entry.getValue() == null ? "" : String.valueOf(entry.getValue()))
                        .append("&");
            }
            paramStr.deleteCharAt(paramStr.length() - 1);
            CloseableHttpClient httpClient = HttpClientUtils.acceptsUntrustedCertsHttpClient();
            HttpComponentsClientHttpRequestFactory clientHttpRequestFactory = new HttpComponentsClientHttpRequestFactory(httpClient);
            RestTemplate restTemplate = new RestTemplate(clientHttpRequestFactory);
            DefaultUriBuilderFactory uriFactory = new DefaultUriBuilderFactory();
            uriFactory.setEncodingMode(DefaultUriBuilderFactory.EncodingMode.VALUES_ONLY);
            restTemplate.setUriTemplateHandler(uriFactory);
            String smsJsonStr = restTemplate.getForObject(SMSURL + paramStr.toString(), String.class);
            Map<String, Object> map = GsonUtil.gsonToMap(smsJsonStr);