使用Jackson使用没有注释的属性来序列化xml [英] Using Jackson to serialize xml using attributes without annotations

问题描述

我目前正在使用Jackson编写一些代码将旧版POJO序列化为XML，但我需要使用属性而不是子元素来序列化它们。有没有办法使用Jackson而不在遗留类中添加注释？

I am currently writing some code using Jackson to serialize legacy POJOs into XML, but I need them to be serialized using attributes not child elements. Is there a way to do this using Jackson without adding annotations to the legacy classes?

推荐答案

是有没有办法使用Jackson而不在遗留类中添加注释？

Is there a way to do this using Jackson without adding annotations to the legacy classes?

你可以尝试使用混合注释杰克逊。通过这种方式，您可以保留旧版课程，同时享受注释功能。这是如何做。

You can try to use Mix-in annotations in jackson. In this way you can preserve your legacy classes and the same time you will enjoy the annotations feature. Here's how.

Person.class

   class Person {
        private String username;
        private String lastName;
        private String address;
        private Integer age;
        //getters and setters 

    }

Mixin.class

abstract class Mixin{
@JacksonXmlProperty(isAttribute = true)
    abstract String getUsername();

    @JacksonXmlProperty(isAttribute = true)
    abstract String getLastName();

    @JacksonXmlProperty(isAttribute = true)
    abstract String getAddress();

    @JacksonXmlProperty(isAttribute = true)
    abstract String getAge();

}

主要方法

public static void main(String[] args) throws JsonProcessingException {
    Person p = new Person("Foo","Bar");
    p.setAddress("This address is too long");
    p.setAge(20);

    ObjectMapper xmlMapper = new XmlMapper();

    xmlMapper.addMixInAnnotations(Person.class, MixIn.class);
    String xml = xmlMapper.writeValueAsString(p);
    System.out.println(xml);
}

输出

<Person xmlns="" username="Foo" lastName="Bar" address="This address is too long" age="20"></Person>

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