如何使用 Spring Boot 在 Rest Api 中传递具有列表键和值的对象

Question

我将带有格式数据的对象传递给 Spring Boot Api：

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;

但我无法将数据传递到后端并得到错误：

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

请帮助我。非常感谢

Answer 1

在后端你期望答案是对象数组，但在前端你发送的是字符串。

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}
  ]
};