为什么我的 JSON 映射器无法识别我的对象？

Question

public class ResponseList implements Serializable {    private String sku;    private String query;    private List<QAResponse> responses;    // getter and setter}第二类：public class QAResponse implements Serializable {    private AnswerLevel answerLevel;    private double similarity;    private String question;    private String dataSource;    private String answer;    private String ensembleFlag;    // getter and setter}我的 JSON (jsonOutput)：{     "sku":"4265252",   "query":"\u8fd9\u6b3e\u662f\u5927\u4e00\u5339\u7684\u5440",   "QAResponse":[        {           "answerLevel":"L1",         "similarity":"1.217891",         "question":"\u51e0\u5339\u7684",         "dataSource":"knowledge",         "ensembleFlag":"YES",         "answer":"1\u5339\u7684"      }}那为什么我的 JSON 对象映射器失败了呢？ResponseList responseList = null;if (jsonOutput != null) {    ObjectMapper mapper = new ObjectMapper();    try {        responseList = mapper.readValue(jsonOutput, ResponseList.class);    } catch (IOException io) {        LOGGER.error(" json mapping to Java object failed!");        io.printStackTrace();    }}错误信息：com.fasterxml.jackson.databind.exc.UnrecognizedPropertyException: Unrecognized field "QAResponse" (class com.jnlu.qe.model.ResponseList), not marked as ignorable (3 known properties: "query", "responses", "sku"]) at [Source: (String)"{"sku": "4265252", "query": "\u8fd9\u6b3e\u662f\u5927\u4e00\u5339\u7684\u5440", "QAResponse": [{"answerLevel": "L1", "similarity": "1.217891", "question": "\u51e0\u5339\u7684", "dataSource": "knowledge", "ensembleFlag": "YES", "answer": "1\u5339\u7684"}, {"answerLevel": "L1", "similarity": "1.193976", "question": "\u8fd9\u4e2a\u662f\u51e0\u5339\u7684", "dataSource": "knowledge", "ensembleFlag": "YES", "answer": "\u8fd9\u6b3e\u662f1\u5339\u7684"}, {"answerLevel": "L1", "similarity": "1.179149", ""[truncated 8542 chars]; line: 1, column: 96] (through reference chain: com.jnlu.qe.model.ResponseList["QAResponse"])Why doesn't the "QAResponse" not recognized?

Answer 1

它抛出异常，因为在 json 输入“QAResponse”属性中不存在。如果您不想将响应更改为类，请添加 @JsonProperty 注释。

@JsonProperty(value = "QAResponse")

private List<QAResponse> responses;

Answer 2

ResponseList类中的字段名称错误，而是：

private List<QAResponse> responses;

它应该是：

private List<QAResponse> QAResponse;

然而，QAResponse.answerLevel字段很可能是一个String除非AnswerLevel是一个枚举。

Answer 3

我认为这是因为在 JSON 中一个属性有一个名称，QAResponse但在一个类中它是一个responses. 所以你必须让它们具有相同的名称