杰克逊：对父元素数组进行JSON解析：根名称＆＃39;＆＃39;与预期不符（＆＃39;列表＆＃39;）

Question

编写以下代码后，我收到以下异常。

引起：com.fasterxml.jackson.databind.JsonMappingException：根名称＆＃39;提交＆＃39;类型[集合类型;与预期（＆＃39;列表＆＃39;）不匹配; class java.util.List，包含[simple type，class MasMonthlyReportDetail]]

JSON对象

{
     "Filing":
    [
           {
                "periodInfo":
                    {
                         "date": "06-05-2013",
                 "year": "2015",
                 "Month": "January"

                    },
            "employerInfo":
                {
                 "name": "Y",
                 "place": "Y",
                 "country": "N",

                    },
                "employeeInfo":
                    [
                         {
                              "name": "785-23-0370",                  
                  "dob": "05/25/1952",

                         }
                    ],
                "messages": 
                [
                     {
                  "defaultMessage" : "xx",
                  "messageType" : "yy",
                  "messageCode" : "102"
                 }
                ]
          },

               {
                "periodInfo":
                    {
                         "date": "06-05-2013",
                 "year": "2015",
                 "Month": "January"

                    },
            "employerInfo":
                {
                 "name": "Y",
                 "place": "Y",
                 "country": "N",

                    },
                "employeeInfo":
                    [
                         {
                              "name": "785-23-0370",                  
                  "dob": "05/25/1952",

                         }
                    ],
                "messages": 
                [
                     {
                  "defaultMessage" : "xx",
                  "messageType" : "yy",
                  "messageCode" : "102"
                 }
                ]
          }
    ]
}

主要类

ObjectMapper objectMapper = new ObjectMapper();        

objectMapper.configure(DeserializationFeature.UNWRAP_ROOT_VALUE, true);

List<MasMonthlyReportDetail> lcd =  objectMapper.readValue(new File(filePath),new TypeReference<List<MasMonthlyReportDetail>>(){});

MasMonthlyReportDetail.java

@JsonRootName(value="Filing")

public class MasMonthlyReportDetail {

    private PeriodInfo periodInfo;
    private EmployerInfo employerInfo;
    List<EmployeeInfo> employeeInfo;
    List<Messages> messages;

    public PeriodInfo getPeriodInfo() {
        return periodInfo;
    }
    public void setPeriodInfo(PeriodInfo periodInfo) {
        this.periodInfo = periodInfo;
    }
    public EmployerInfo getEmployerInfo() {
        return employerInfo;
    }
    public void setEmployerInfo(EmployerInfo employerInfo) {
        this.employerInfo = employerInfo;
    }
    public List<EmployeeInfo> getEmployeeInfo() {
        return employeeInfo;
    }
    public void setEmployeeInfo(List<EmployeeInfo> employeeInfo) {
        this.employeeInfo = employeeInfo;
    }
    public List<Messages> getMessages() {
        return messages;
    }
    public void setMessages(List<Messages> messages) {
        this.messages = messages;
    }

}

Answer 1

我做了以下更改，代码对我有用。

主类：

InputStream inputStream = resource.getInputStream();

ObjectMapper objectMapper = new ObjectMapper();

MasMonthlyReportDetailHolder masMonthlyReportDetailHolder = objectMapper.readValue(inputStream, MasMonthlyReportDetailHolder.class);

List<MasMonthlyReportDetail> masMonthlyReportDetail = masMonthlyReportDetailHolder.getMasMonthlyReportDetail();

MasMonthlyReportDetailHolder类：

public class MasMonthlyReportDetailHolder {

    private List<MasMonthlyReportDetail> masMonthlyReportDetail;

    @JsonProperty("Filing")
    public List<MasMonthlyReportDetail> getMasMonthlyReportDetail() {
        return masMonthlyReportDetail;
    }

    public void setMasMonthlyReportDetail(
            List<MasMonthlyReportDetail> masMonthlyReportDetail) {
        this.masMonthlyReportDetail = masMonthlyReportDetail;
    }

}

添加@JsonProperty("Filing")是避免此问题的关键。如有任何其他程序，请告诉我。

Answer 2

你试过这个吗？ 。jacksonObjectMapper.reader（MasMonthlyReportDetail.class）.withRootName（ “归档”）readValue（jsonAsString）;