Question

我有像这样的json

{
    "name": "john",
    "photo_urls":
    {
      "large": "http://www.server.com/john_photo.jpg"
    }
}

我想在一个类中反序列化它，比如

public class Person
{
    String name;
    String photoUrl;
}

而不是

public class Person
{
    String name;
    public class photo_urls
    {
        String large;
    }
}

使用数据绑定和注释@JsonProperty可以使用Jackson吗？或者是否有必要使用流API？

感谢您的帮助。

Answer 1

您可以考虑使用Map<String,String>类型的setter方法或构造函数参数，从中可以获取url字段值。这是一个例子：

public class JacksonDeserialize {
    private static final String JSON = "{\n" +
            "    \"name\": \"john\",\n" +
            "    \"photo_urls\":\n" +
            "    {\n" +
            "      \"large\": \"http://www.server.com/john_photo.jpg\"\n" +
            "    }\n" +
            "}";


    public static class Person
    {
        private String name;
        private String photoUrl;

        @JsonCreator
        public Person(@JsonProperty("name") String name, @JsonProperty("photo_urls") Map<String, String> photoUrl) {
            this.name = name;
            this.photoUrl = photoUrl.get("large");
        }

        @Override
        public String toString() {
            return "Person{" +
                    "photoUrl='" + photoUrl + '\'' +
                    ", name='" + name + '\'' +
                    '}';
        }
    }

    public static void main(String[] args) throws IOException {
        ObjectMapper mapper = new ObjectMapper();
        System.out.println(mapper.readValue(JSON, Person.class));
    }
}

输出：

Person{photoUrl='http://www.server.com/john_photo.jpg', name='john'}

json使用数据绑定对jackson内部对象的字段进行反序列化

1 个答案: