如何使用Spring RestTemplate访问restful服务

@RestController
public class TestController
{
  @RequestMapping(value = "testPost", method = RequestMethod.POST)
  public ResponseBean testPost(@RequestBody RequestBean requestBean)
  {
    ResponseBean responseBean = new ResponseBean();
    responseBean.setRetCode("0000");
    responseBean.setRetMsg("succ");

    return responseBean;
  }
}

    //请求地址
    String url = "http://localhost:8080/testPost";
    //入参
    RequestBean requestBean = new RequestBean();
    requestBean.setTest1("1");
    requestBean.setTest2("2");
    requestBean.setTest3("3");

    RestTemplate restTemplate = new RestTemplate();
    ResponseBean responseBean = restTemplate.postForObject(url, requestBean, ResponseBean.class);

    RestTemplate restTemplate = new RestTemplate();
    //获取RestTemplate默认配置好的所有转换器
    List<HttpMessageConverter<?>> messageConverters = restTemplate.getMessageConverters();
    //默认的MappingJackson2HttpMessageConverter在第7个 先把它移除掉
    messageConverters.remove(6);
    //添加上GSON的转换器
    messageConverters.add(6, new GsonHttpMessageConverter());

    //生成一个设置了连接超时时间、请求超时时间、异常最大重试次数的httpClient
    RequestConfig config = RequestConfig.custom().setConnectionRequestTimeout(10000).setConnectTimeout(10000).setSocketTimeout(30000).build();
    HttpClientBuilder builder = HttpClientBuilder.create().setDefaultRequestConfig(config).setRetryHandler(new DefaultHttpRequestRetryHandler(5, false));
    HttpClient httpClient = builder.build();
    //使用httpClient创建一个ClientHttpRequestFactory的实现
    ClientHttpRequestFactory requestFactory = new HttpComponentsClientHttpRequestFactory(httpClient);
     //ClientHttpRequestFactory作为参数构造一个使用作为底层的RestTemplate
    RestTemplate restTemplate = new RestTemplate(requestFactory);

public class TokenInterceptor implements ClientHttpRequestInterceptor
{
  @Override
  public ClientHttpResponse intercept(HttpRequest request, byte[] body, ClientHttpRequestExecution execution) throws IOException
  {
    //请求地址
    String checkTokenUrl = request.getURI().getPath();
    //token有效时间
    int ttTime = (int) (System.currentTimeMillis() / 1000 + 1800);
    //请求方法名 POST、GET等
    String methodName = request.getMethod().name();
    //请求内容
    String requestBody = new String(body);
    //生成令牌 此处调用一个自己写的方法，有兴趣的朋友可以自行google如何使用ak/sk生成token，此方法跟本教程无关，就不贴出来了
    String token = TokenHelper.generateToken(checkTokenUrl, ttTime, methodName, requestBody);
    //将令牌放入请求header中
    request.getHeaders().add("X-Auth-Token",token);

    return execution.execute(request, body);
  }
}

RestTemplate restTemplate = new RestTemplate();
    //向restTemplate中添加自定义的拦截器
    restTemplate.getInterceptors().add(new TokenInterceptor());