RestTemplate的postForEntity方法传递数组，将集合转换成json字符串

public Object xxxx(List<Xxxx> xxxx) {
    HttpHeaders headers = new HttpHeaders();
    HttpEntity<String> entity = new HttpEntity<>(JSON.toJSONString(xxxx), headers);
    ResponseEntity<Object> response = restTemplate.postForEntity("url", entity, Object.class);
    return response.getBody();
}