restTemplate 的post請求解決 亂碼問題 設置UTF-8

HttpHeaders headers = new HttpHeaders();
MediaType type = MediaType.parseMediaType("application/json; charset=UTF-8");
// 請勿輕易改變此提交方式，大部分的情況下，提交方式都是表單提交
headers.setContentType(type);
headers.add("Accept", MediaType.APPLICATION_JSON.toString());
JSONObject jsonObj = new JSONObject();
jsonObj.put("uid",sendMessage.getUId());
jsonObj.put("message",sendMessage.getMessage());
jsonObj.put("param",sendMessage.getParam());
// 封裝參數，千萬不要替換為Map與HashMap，否則參數無法傳遞
MultiValueMap<String, String> params = new LinkedMultiValueMap<String, String>();

HttpEntity<String> requestEntity = new HttpEntity<String>(jsonObj.toString(), headers);
// 執行HTTP請求
ResponseEntity<String> exchange = restTemplate.exchange(url, HttpMethod.POST, requestEntity, String.class);