java - 如何在 POST 方法(RestTemplate)中将 List 作为正文传递

Question

我正在尝试使用restTemplate发出Post请求，问题是API正在接受List<Users>在正文中作为 POST 请求

public class Users {

    String id;

    String name;

    String gender;

}

我已将元素添加为

List<Users> userList=new ArrayList<Users>();
userList.add(new Users("1","AA","Male"));
userList.add(new Users("2","BB","Male"));
userList.add(new Users("3","CC","Female"));

AS

HttpHeaders headers = new HttpHeaders();
headers.setContentType(MediaType.APPLICATION_JSON);
HttpEntity<String> entity = new HttpEntity<>(headers);

ResponseEntity<String> response =  restTemplate.postForEntity(URL.toString(), HttpMethod.POST, entity, String.class);

这里我应该如何将我的 userList 传递到请求正文中？

Answer 1

您需要在 HttpEntity 中传递数据。您可以使用来自 jackson-databind lib 的 ObjectMapper 将列表转换为 json。

String userJsonList = objectMapper.writeValueAsString(userList);

HttpHeaders headers = new HttpHeaders();
headers.setContentType(MediaType.APPLICATION_JSON);
HttpEntity<String> entity = new HttpEntity<>(userJsonList, headers);

ResponseEntity<String> response =  restTemplate.postForEntity(URL.toString(), HttpMethod.POST, entity, String.class);

所以基本上它会将数据作为 json 字符串传递。