是否可以使用 Spring Boot 将嵌套的 Json 数组存储到数据库？

Posted 2023-02-27

【中文标题】是否可以使用 Spring Boot 将嵌套的 Json 数组存储到数据库？

【英文标题】：Is that Possible to Store Nested Json Array To Database Using Spring Boot?

【发布时间】：2021-12-27 05:56:18

【问题描述】：

这是我的 Json 格式

[ 
        "basicInfo": 
           "uniqueFileNo": "123456tf",
           "actualOrgid": "3",
           "tRefNo": "Test Tender 1",
           "tType": "Open Tender",
           "tFormContract": "Works",
           "tNoOfCovers": "2",
           "tTenderCategory": "Works",
           "tNoOfBidOpeners": "2 Off 2",
           "tAllowAutomaticEvaluation": "false",
           "tAllowMultiCurrencyForBoq": "false",
           "creatorName": "Wils",
           "creatorReference": "WilsDG"
        ,
        "multiCurrencyForBoq": "",
        "boqinfo": "",
        "coverinfo": 
           "cover": [
              
                 "tCoverNo": "1",
                 "tDocDesc": "Scanned Fee Details",
                 "tDocType": ".pdf"
              ,
               
                 "tCoverNo": "2",
                 "tDocDesc": "UnScanned Fee Details",
                 "tDocType": ".csv"
              
           ]
        
        
  ]

我几乎完成了但是，在保存cover **数组结构时遇到问题** 帮我解决这个问题

错误是

Cannot deserialize value of typecom.demo.model.Coverfrom Array value (tokenJsonToken.START_ARRAY) at [Source: (BufferedInputStream); line: 19, column: 25] (through reference chain: java.util.ArrayList[0]->com.demo.model.TenderBasicDetails["coverinfo"]->com.demo.model.CoverInfo["cover"])

请帮我解决这个问题 谢谢

【参考方案1】：

由于您没有提供代码，我真的不知道出了什么问题，但这可能是您定义属性和/或类结构的方式：

注意：

使用 @JsonIgnoreProperties(ignoreUnknown = true) 是因为我不想定义 JSON 中的每个元素

@DataLombok 注解，但是你可以创建 Getter/Setters

@JsonProperty 确保 JSON 字段名映射到类字段。

应该是这样的：

@Data
@JsonIgnoreProperties(ignoreUnknown = true)
public class Wrapper
    private BasicInfo basicInfo;
    private String multiCurrencyForBoq;
    private String boqinfo;
    private CoverInfo coverinfo;

@Data
@JsonIgnoreProperties(ignoreUnknown = true)
public class BasicInfo

    private String uniqueFileNo;
    private String actualOrgid;
    private String tRefNo;

@Data
public class CoverInfo
    private List<CoverDetails> cover = new ArrayList<>();


@Data
public class CoverDetails

    @JsonProperty("tCoverNo")
    private String tCoverNo;

    @JsonProperty("tDocDesc")
    private String tDocDesc;

    @JsonProperty("tDocType")
    private String tDocType;



public static void main(String[] args) throws Exception

    ObjectMapper objectMapper  = new ObjectMapper();
    String json = "[ \n" +
            "        \"basicInfo\": \n" +
            "           \"uniqueFileNo\": \"123456tf\",\n" +
            "           \"actualOrgid\": \"3\",\n" +
            "           \"tRefNo\": \"Test Tender 1\",\n" +
            "           \"tType\": \"Open Tender\",\n" +
            "           \"tFormContract\": \"Works\",\n" +
            "           \"tNoOfCovers\": \"2\",\n" +
            "           \"tTenderCategory\": \"Works\",\n" +
            "           \"tNoOfBidOpeners\": \"2 Off 2\",\n" +
            "           \"tAllowAutomaticEvaluation\": \"false\",\n" +
            "           \"tAllowMultiCurrencyForBoq\": \"false\",\n" +
            "           \"creatorName\": \"Wils\",\n" +
            "           \"creatorReference\": \"WilsDG\"\n" +
            "        ,\n" +
            "        \"multiCurrencyForBoq\": \"\",\n" +
            "        \"boqinfo\": \"\",\n" +
            "        \"coverinfo\": \n" +
            "           \"cover\": [\n" +
            "              \n" +
            "                 \"tCoverNo\": \"1\",\n" +
            "                 \"tDocDesc\": \"Scanned Fee Details\",\n" +
            "                 \"tDocType\": \".pdf\"\n" +
            "              ,\n" +
            "               \n" +
            "                 \"tCoverNo\": \"2\",\n" +
            "                 \"tDocDesc\": \"UnScanned Fee Details\",\n" +
            "                 \"tDocType\": \".csv\"\n" +
            "              \n" +
            "           ]\n" +
            "        \n" +
            "        \n" +
            "  ]";
    System.out.println(objectMapper.readValue(json, new TypeReference<List<Wrapper>>()));

  

日志：

[DemoApplication.Wrapper(basicInfo=DemoApplication.BasicInfo(uniqueFileNo=123456tf, actualOrgid=3, tRefNo=null), multiCurrencyForBoq=, boqinfo=, coverinfo=DemoApplication.CoverInfo(cover=[DemoApplication.CoverDetails(tCoverNo=1, tDocDesc=Scanned Fee Details, tDocType=.pdf), DemoApplication.CoverDetails(tCoverNo=2, tDocDesc=UnScanned Fee Details, tDocType=.csv)]))]

=====已编辑============

请清理您的代码：

将@JsonIgnoreProperties(ignoreUnknown = true) 放在班级级别，然后从所有字段中删除... 如果您使用 Lombok @Data，请删除所有 getter/setter，请 从各处删除所有@JsonProperty.... 修改您的Cover.java 以拥有：

---

@JsonProperty("tCoverNo")
private String tCoverNo;

@JsonProperty("tDocDesc")
private String tDocDesc;

@JsonProperty("tDocType")
private String tDocType;

@JsonProperty 背后的要点是绑定一个与 json 字段名称不同的类字段..

Class Field : blah
Json Field: BLAH
@JsonProperty("BLAH")

【讨论】：

感谢兄弟的想法，但我试试这个但是 Hibernate 不能将 Cover Entity Fields 作为表格列，所以我不知道如何解决这个问题，而且我对 stackover 流程​​更新鲜，所以我也不知道如何用正确的 wway 提问。对此感到抱歉，我的代码是 [github.com/akoram/Spring-Boot-Json-To-Db.git] 这里所以请看看这个以及我在这个项目中犯错的地方。 谢谢非常感谢@SMA

@Akoram 更新，在我检查了你的代码之后。请相应更新并回复我。

好的兄弟@SMA