如何使用Spring在Rest中传递带有列表键和值的对象

Question

我将一个具有格式数据的对象传递给：

const examRequest = {
  examId: 10,
  timer: 100,
  anwsers: "{1:2, 2:1}", (pair question ID and value)
};

const submitData = (examRequest) => {
  const url = "/exams/submit";
  return axios.post(url, examRequest);

},

后端：

@PostMapping(value = "/exams/submit")
public ResponseEntity<?> submitData(
        @Valid @RequestBody AnswerResponse answerResponse) {
    return examService.submitData(answerResponse);
}

AnswerResponse.java

private Long examId;

private Integer timer;

List<AnswerPair> answers;

AnswerPair.java

private Long questionId;

private Long keyAnswer;

但是，我不能将数据传递到后端并获得错误：

JSON解析错误:无法从START_OBJECT令牌反序列化java.util.ArrayList<AnswerPair>实例

请帮帮我。非常感谢

Answer 1

在后端，您期待答案作为对象数组，但在前端，您正在发送字符串。

请求对象需要如下所示

const examRequest = {
  examId: 10,
  timer: 100,
  anwsers: [
    {questionId: 1, keyAnswer: 2}, 
    {questionId: 2, keyAnswer: 1}
  ]
};