錯誤：沒有找到類org.json.JSONObject的序列化程式，也沒有找到創建BeanSerializer的屬性

我收到此錯誤 “嵌套例外是 org.springframework.http.converter.HttpMessageConversionException：型別定義錯誤：[簡單型別，類 org.json.JSONObject]；嵌套例外是 com.fasterxml.jackson.databind.exc.InvalidDefinitionException：運行專案時沒有找到類 org.json.JSONObject 的序列化程式，也沒有發現創建 BeanSerializer 的屬性。我嘗試了通過這個平臺找到的許多解決方案，但這些對我沒有用。是這種情況還是其他情況？如果是這樣，請幫我解決這個問題。

下面是 RowEvent.java 類。

@Component("support.support-provider.row-event")
public class RowEventSupportProvider extends SupportProvider {

    @Override
    public SupportResponse search(SearchData searchData) throws JSONException {
        JSONObject supportProvider = new JSONObject();
        supportProvider.put("startDate", searchData.getStartDate());
        supportProvider.put("startTime", searchData.getStartTime());
        supportProvider.put("endDate", searchData.getEndDate());
        supportProvider.put("endTime", searchData.getEndTime());
        supportProvider.put("clientId", searchData.getClientId());
        supportProvider.put("launchContextId", searchData.getLaunchContextId());
        supportProvider.put("integrationId", searchData.getIntegrationId());
        supportProvider.put("deploymentId", searchData.getDeploymentId());
        supportProvider.put("courseId", searchData.getCourseId());
        supportProvider.put("courseType", searchData.getCourseType());
        supportProvider.put("assignmentId", searchData.getAssignmentId());
        supportProvider.put("assignmentType", searchData.getAssignmentType());
        supportProvider.put("userId", searchData.getUserId());
        supportProvider.put("userType", searchData.getUserType());

        SupportResponse supportResponse = new SupportResponse();
        supportResponse.setData(supportProvider);
        return supportResponse;
    }
}

SupportResponse.java

    import com.fasterxml.jackson.annotation.JsonAutoDetect;
import org.json.JSONObject;
import org.springframework.hateoas.Links;
import org.springframework.hateoas.RepresentationModel;

import java.util.List;
@JsonAutoDetect(fieldVisibility = JsonAutoDetect.Visibility.ANY)
public class SupportResponse extends RepresentationModel<SupportResponse>
{
        String id;
        Object data;
        List<Links> links;

        public String getId() {
                return id;
        }

        public void setId(String id) {
                this.id = id;
        }

        public Object getData() {
                return data;
        }

        public void setData(Object data) {
                this.data = data;
        }
}

uj5u.com熱心網友回復：

似乎您正在使用 json.org 依賴項來序列化 JSON，但是 spring 已經附帶了另一個 json 庫（jackson-databind），而 jackson 不知道如何將 JSONObject 從 org.json 轉換為 Json 字串。

要解決此問題，您可以使用ObjectNode，它是 Jackson Databind 中的 JSONObject 等效項：

@Component("support.support-provider.row-event")
public class RowEventSupportProvider extends SupportProvider {
    @Autowired
    private ObjectMapper objectMapper;

    @Override
    public SupportResponse search(SearchData searchData) throws JSONException {
        ObjectNode supportProvider = objectMapper.createObjectNode();
        supportProvider.put("startDate", searchData.getStartDate());
        supportProvider.put("startTime", searchData.getStartTime());
        supportProvider.put("endDate", searchData.getEndDate());
        supportProvider.put("endTime", searchData.getEndTime());
        supportProvider.put("clientId", searchData.getClientId());
        supportProvider.put("launchContextId", searchData.getLaunchContextId());
        supportProvider.put("integrationId", searchData.getIntegrationId());
        supportProvider.put("deploymentId", searchData.getDeploymentId());
        supportProvider.put("courseId", searchData.getCourseId());
        supportProvider.put("courseType", searchData.getCourseType());
        supportProvider.put("assignmentId", searchData.getAssignmentId());
        supportProvider.put("assignmentType", searchData.getAssignmentType());
        supportProvider.put("userId", searchData.getUserId());
        supportProvider.put("userType", searchData.getUserType());

        SupportResponse supportResponse = new SupportResponse();
        supportResponse.setData(supportProvider);
        return supportResponse;
    }
}

標籤：爪哇 json

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