使用jackson xml mapper将xml反序列化为pojo [英] deserialize xml to pojo using jackson xml mapper

问题描述

我使用Jackson XML映射器将XML反序列化为POJO。 XML看起来像

I am using Jackson XML mapper to deserialize XML to POJO. The XML looks like

<person>
 <agency>
        <phone>111-111-1111</phone>
 </agency>
</person>

我的班级看起来像

class Person
{
 @JacksonXmlProperty(localName="agency", namespace="namespace")
 private Agency agency;
 //getter and setter
}
class Agency
{
 @JacksonXmlElementWrapper(useWrapping = false)
 @JacksonXmlProperty(localName="phone", namespace="namespace")
 private List<AgencyPhone> phones;
 //getter and setter
}
class AgencyPhone
{
  private Phone phone;
  //getter and setter
}
class Phone
{
 private String number;
 //getter and setter
}

我想设置电话号码在Phone类中编号。我无法更改XML或类的结构方式。我收到了无法构造 resolved.agency.AgencyPhone 错误的实例，我创建了一个AgencyPhone构造函数

I want to set the phone number to number in Phone class. I cannot change XML or the way the class has been structured. I am getting Cannot construct instance of resolved.agency.AgencyPhone error and I created a AgencyPhone constructor

class AgencyPhone{
{
  private Phone phone;
  public AgencyPhone(Phone phone)
  {
      this.phone = phone;
   }
  }

但这不起作用。那么如何反序列化为嵌套实例。

But that did not work. So how to deserialize to nested instances.

推荐答案

您可以编写自己的自定义反序列化器来实现此目的。以下是让您入门的代码：

You can write your own custom deserialiser to achieve this. Here is the code to get you started:

import com.fasterxml.jackson.core.JsonParseException;
import com.fasterxml.jackson.core.JsonParser;
import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.DeserializationContext;
import com.fasterxml.jackson.databind.JsonMappingException;
import com.fasterxml.jackson.databind.deser.std.StdDeserializer;
import com.fasterxml.jackson.databind.module.SimpleModule;
import com.fasterxml.jackson.dataformat.xml.XmlMapper;
import java.io.IOException;

public class Test {
  public static void main(String[] args) throws JsonParseException, JsonMappingException, IOException {
    XmlMapper mapper = new XmlMapper();
    final SimpleModule module = new SimpleModule("configModule",   com.fasterxml.jackson.core.Version.unknownVersion());
    module.addDeserializer(Person.class, new DeSerializer());
    mapper.registerModule(module);
    // Person readValue = mapper.readValue(<xml source>);
  }
}

class DeSerializer extends StdDeserializer<Person> {

  protected DeSerializer() {
    super(Person.class);
  }

  @Override
  public Person deserialize(JsonParser p, DeserializationContext ctxt) throws IOException, JsonProcessingException {
    // use p.getText() and p.nextToken to navigate through the xml and construct Person object
    return new Person();

  }
}

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