没有为类org.json.JSONObject找到序列化程序，也没有发现创建BeanSerializer的属性 [英] No serializer found for class org.json.JSONObject and no properties discovered to create BeanSerializer

问题描述

从网络服务获取JSON，Json数组作为回复

having JSON from web service, Json Array as a response

   [3]
   0:  {
   id: 2
  name: "a561137"
    password: "test"
  firstName: "abhishek"
   lastName: "ringsia"
    organization: "bbb"
      }-
    1:  {
      id: 3
  name: "a561023"
password: "hello"
     firstName: "hello"
   lastName: "hello"
     organization: "hello"
   }-
 2:  {
  id: 4
  name: "a541234"
  password: "hello"
 firstName: "hello"
  lastName: "hello"
  organization: "hello"
    }

在JsonArray中获取响应后在读取Json数组的Json对象时出错：

After Getting Response in JsonArray Getting error while reading Json Object of Json Array :

List<User> list = new ArrayList<User>();
JSONArray jsonArr = new JSONArray(response);

for (int i = 0; i < jsonArr.length(); i++) {
    JSONObject jsonObj = jsonArr.getJSONObject(i);
    ObjectMapper mapper = new ObjectMapper();
    User usr=   mapper.convertValue(jsonObj, User.class);
    list.add(usr);
}

没有为类org.json找到序列化程序。 JSONObject并没有发现创建BeanSerializer的属性（为了避免异常，禁用SerializationConfig.Feature.FAIL_ON_EMPTY_BEANS））

No serializer found for class org.json.JSONObject and no properties discovered to create BeanSerializer (to avoid exception, disable SerializationConfig.Feature.FAIL_ON_EMPTY_BEANS) )

推荐答案

首先要接受它作为Json数组，然后在读取它的Object时必须使用Object Mapper.readValue，因为Json Object仍然在String中。

have To Accept it first as a Json Array ,then while reading its Object have to use Object Mapper.readValue ,because Json Object Still in String .

List<User> list = new ArrayList<User>();
JSONArray jsonArr = new JSONArray(response);

for (int i = 0; i < jsonArr.length(); i++) {
    JSONObject jsonObj = jsonArr.getJSONObject(i);
    ObjectMapper mapper = new ObjectMapper();
    User usr = mapper.readValue(jsonObj.toString(), User.class);      
    list.add(usr);
}

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