Java 如何使用Spring Data Mongo DB为类建模，以存储具有不同字段长度和类型的嵌套JSON文档

我是Spring Boot和Mongo DB的新手，我正在尝试建模POJO类-“Patient”和“Survey”，它们应该存储和持久化患者调查数据。调查数据将作为JSON从第三方提供给我们，其中包含任意数量的问题和答案以及任意类型

我应该使用什么数据类型/注释将嵌套的JSON存储为单个实体/对象？ 我听说MongoDB将JSON存储为BSON。但是我该怎么做呢

目前，我的模型类如下所示

@Document
public class Patient {

    @Id private String id;


    private String pID;
    private String firstName;
    private String lastName;

    @DBRef
    private List<Survey> surveys;

    public Patient() { }

    public Patient(String fName, String lName)
    {
        this.firstName = fName;
        this.lastName = lName;
    }

    public String getpID() {
        return pID;
    }

    public void setpID(String pID) {
        this.pID = pID;
    }

    public String getFirstName() {
        return firstName;
    }

    public void setFirstName(String firstName) {
        this.firstName = firstName;
    }

    public String getLastName() {
        return lastName;
    }

    public void setLastName(String lastName) {
        this.lastName = lastName;
    }
}



@Document
public class Survey {

    @Id private String id;

    private String pID;

    private Document surveyData;

    public Survey(String pID, Document surveyData)
    {
        this.pID = pID;
        this.surveyData = surveyData;
    }

    public String getpID() {
        return pID;
    }

    public void setpID(String pID) {
        this.pID = pID;
    }

    public Document getSurveyData() {
        return surveyData;
    }

    public void setSurveyData(Document surveyData) {
        this.surveyData = surveyData;
    }

}

@RepositoryRestResource(collectionResourceRel = "Survey", path = "survey")
public interface SurveyRepository extends MongoRepository<Survey, String> {

    public Survey findBypID(@Param("pID") String pID);

}

我得到的例外是

2017-03-15 17:18:19.257 ERROR 15364 --- [nio-8080-exec-3] o.s.d.r.w.RepositoryRestExceptionHandler : Could not read document: Can not deserialize Class org.springframework.data.mongodb.core.mapping.Document (of type annotation) as a Bean
 at [Source: org.apache.catalina.connector.CoyoteInputStream@5d3981f6; line: 1, column: 1]; nested exception is com.fasterxml.jackson.databind.JsonMappingException: Can not deserialize Class org.springframework.data.mongodb.core.mapping.Document (of type annotation) as a Bean
 at [Source: org.apache.catalina.connector.CoyoteInputStream@5d3981f6; line: 1, column: 1]

---

通过将surveyData的数据类型更改为“Object”，现在我可以将嵌入的JSON对象存储在Java模型类中

---

“Document”作为一种类型似乎无效，因为它是一种注释。

通过将surveyData的数据类型更改为“Object”，现在我可以将嵌入的JSON对象存储在Java模型类中

---

似乎“Document”作为类型无效，因为它是注释。

“…将JSON存储为GSON”-您可能指的是BSON，而不是GSON--GSON是一个库，而BSON是一种数据格式。这个问题似乎超出了gson的标记范围。你能提供一个调查的示例文档吗？嗨，Markus，是的，我指的是BSON“…将JSON存储为gson”-你可能指的是BSON，而不是gson--gson是一个库，而BSON是一种数据格式。这个问题似乎超出了gson的标签范围。你能提供一份调查的样本文档吗？嗨，Markus，是的，我是说BSON

2017-03-15 17:18:19.257 ERROR 15364 --- [nio-8080-exec-3] o.s.d.r.w.RepositoryRestExceptionHandler : Could not read document: Can not deserialize Class org.springframework.data.mongodb.core.mapping.Document (of type annotation) as a Bean
 at [Source: org.apache.catalina.connector.CoyoteInputStream@5d3981f6; line: 1, column: 1]; nested exception is com.fasterxml.jackson.databind.JsonMappingException: Can not deserialize Class org.springframework.data.mongodb.core.mapping.Document (of type annotation) as a Bean
 at [Source: org.apache.catalina.connector.CoyoteInputStream@5d3981f6; line: 1, column: 1]