Jackson将json字符串序列化为Java对象 [英] Jackson double serialized json string to Java object

问题描述

我有一个Json字符串，它有一个字符串消息字段。
字符串：

I have a Json string which has a string message field. String:

{  "Type" : "Text",
   "Subject" : "data received",
   "Message" :"{\\"language\\":\\"US\\",\\"data\\":\\"signature\\"}"
}

我想转换它进入以下结构：
Notification.java

I want to convert it into the following structure: Notification.java

public class Notification {
  String type;
  String subject;
  Message message;
}

Message.java

Message.java

public class Message {
  String language;
  String data;
}

有没有办法可以直接将字符串转换为Java对象以上结构？我想避免反序列化两次。

Is there a way in which I can directly convert the string to a Java object of the above structure? I want to avoid deserializing twice.

推荐答案

您可以创建自定义反序列化器将消息文本反序列化为消息对象并注释消息带的类@JsonDeserialize ：

You can create a custom Deserializer to deserialize the Message text into Message object and annotate the Message class with @JsonDeserialize:

@JsonDeserialize(using = MessageDeserializer.class)
public class Message {
    String language;
    String data;
}

public class MessageDeserializer extends JsonDeserializer<Message> {

    public MessageDeserializer() {
        super();
    }

    @Override
    public Message deserialize(
            final JsonParser jsonParser, final DeserializationContext deserializationContext) throws
            IOException, JsonProcessingException {
        final String messageText = jsonParser.getText(); 
        // parse messageText into Message object
    }
}

这篇关于Jackson将json字符串序列化为Java对象的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！