序列化具有Map对象的java对象，键是字符串，值是JSON字符串的抽象类

Question

我正在尝试使用objectmapper序列化具有Map的java对象。 下面是我正在尝试并且已经起作用的代码。

public abstract class DataTypeModel {

    DataType type;
    String description;

    public DataTypeModel(DataType type, String description) {
        this.type = type;
        this.description = description;
    }

    public DataType getType() {
        return type;
    }

    public String getDescription() {
        return description;
    }



}


   import lombok.Getter;
import lombok.Setter;

public class StringDataTypeModel extends DataTypeModel {
    @Setter @Getter Integer minLength;
    @Setter @Getter Integer maxLength;

    public StringDataTypeModel(DataType type, String description, Integer minLength, Integer maxLength) {
        super(type, description);
        this.minLength = minLength;
        this.maxLength = maxLength;
    }
}


import java.util.ArrayList;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;

import lombok.Data;

@Data
public class TableModel {

    private String type;
    private List<String> required = new ArrayList<String>();
    private Map<String, DataTypeModel> properties = new LinkedHashMap<>();
    private String title;
    private String name;

}



public class Test {

public static void main(String args[]) throws IOException {
    ObjectMapper mapper = new ObjectMapper();
    mapper.configure(SerializationFeature.INDENT_OUTPUT, true);
    mapper.disable(SerializationFeature.FAIL_ON_EMPTY_BEANS);
    mapper.writerWithDefaultPrettyPrinter();


    TableModel table = new TableModel();

    Map<String, DataTypeModel> properties = new HashMap<>();

    properties.put("code", new StringDataTypeModel(DataType.string, "this is string", 1, 15,"/s"));
    properties.put("startDate", new DateDataTypeModel(DataType.date, "this is date", "pattern"));

    table.setProperties(properties);
    table.setType("object");
    table.setRequired(Arrays.asList("code"));
    table.setTitle("this is branch table for bank");

    mapper.writer().withRootName("branch").writeValue(new File("Table.json"), table);

    //Object to JSON in String
    String jsonInString = mapper.writer().withRootName("branch").writeValueAsString(table);
    System.out.println(jsonInString);
}

}

我能够产生预期的输出，即：

{
 "type": "object",
 "required": [
    "a"
 ],
 "properties": {
    "a": {
        "type": "number",
        "description": "this is column a"
    },
    "b": {
        "type": "date",
        "description": "this is column b"
    },
    "fullName": {
        "type": "string",
        "description": "",
        "minLength": 1,
        "maxLength": 10
    }
 },
 "title": "this is table",
 "name": "test_table"       

}

使用杰克逊对象映射器，我可以在字符串中生成预期的json。

最后，我序列化了具有Map对象的java对象，键是字符串，值是JSON字符串的抽象类