带有嵌套对象的 ObjectMapper

Question

我有 JSON 数组响应，但不是映射和抛出错误，我如何处理 JSON 像这样


{
"total":10,
"count":10,
"start":0,
"items":[
{
"ID":"Hyd4VVGtCNpyLh7JEOL3X-b92yollu9nb3KbweWxNaI=@mailhog.example",
"From":{"Relays":null,"Mailbox":"emails","Domain":"gmail.com","Params":""},
"To":[{"Relays":null,"Mailbox":"test","Domain":"gmail.com","Params":""}],
"Content":{"Headers":{"Content-Type":["multipart/mixed; \tboundary=\"----=_Part_27_47303298.1622881481751\""],
"Date":["Sat, 5 Jun 2021 11:24:42 +0300 (EEST)"],
"From":["test@gmail.com"],
"MIME-Version":["1.0"],

我试过这样映射

 public static class ResponseDto{
        Integer total;
        Integer count;
        Integer start;
        List<ItemDto> items;
//getters,setters
}


public static class ItemDto{
        String id;
}

我得到一个错误：

com.fasterxml.jackson.databind.exc.UnrecognizedPropertyException: Unrecognized field "ID" (class package.api.utils.ApiMailHogUtil$ItemDto), not marked as ignorable (one known property: "id"])
 at [Source: (StringReader); line: 1, column: 50] (through reference chain: package.api.utils.ApiMailHogUtil$ResponseDto["items"]->java.util.ArrayList[0]->package.api

我做错了什么？

Answer 1

如评论所述，Jackson 未找到“ID”字段，因此抛出异常。您可以在 ItemDto 中的 id 字段顶部添加 @JsonProperty("ID"):

public static class ItemDto{
        @JsonProperty("ID")
        String id;
        // other fields
}

带有嵌套对象的 ObjectMapper

ObjectMapper with nested object

java

json

objectmapper