Jackson XML自定义字段解串器

Question

When using Jackson for JSON processing I extended JsonDeserializer<T> and was able to handle custom deserialization. Is there a similar thing for processing XML with Jackson?

import java.util.List;

public class Something {

    private int iinteger;

    private String sstring;

    private List<String> sarray;

    public Something(int iinteger, String sstring, List<String> sarray) {
        this.iinteger = iinteger;
        this.sstring = sstring;
        this.sarray = sarray;
    }

    public Shit() {
    }

    public int getIinteger() {
        return iinteger;
    }

    public void setIinteger(int iinteger) {
        this.iinteger = iinteger;
    }

    public String getSstring() {
        return sstring;
    }

    public void setSstring(String sstring) {
        this.sstring = sstring;
    }

    public List<String> getSarray() {
        return sarray;
    }

    public void setSarray(List<String> dumb) {
        this.sarray = dumb;
    }
}

I want to deserialize from

<?xml version="1.0"?>
<Something xmlns="">
    <iinteger>23</iinteger>
    <sstring>hey</sstring>
    <sarray >abc abd abv</sarray >
</Something>

Answer 1

Besides JSON, Jackson also de/serializes from/to XML .

You'll need the following dependency:

<dependency>
    <groupId>com.fasterxml.jackson.dataformat</groupId>
    <artifactId>jackson-dataformat-xml</artifactId>
    <version>2.6.3</version>
</dependency>

In addition to standard Jackson annotations and optional JAXB annotations ( javax.xml.bind.annotation ), Jackson provides some XML-specific annotations .

Consider the following POJO as example:

public class Simple {
    public int x = 1;
    public int y = 2;
}

You can serialize it to XML using:

ObjectMapper xmlMapper = new XmlMapper();
String xml = xmlMapper.writeValueAsString(new Simple());

The result is:

<Simple>
    <x>1</x>
    <y>2</y>
</Simple>

To deserialize:

ObjectMapper xmlMapper = new XmlMapper();
Simple value = xmlMapper.readValue("<Simple><x>1</x><y>2</y></Simple>", Simple.class);

Answer 2

Yes, there is JAXB .

Intro to JAXB

The reference implementation is called Project Kenai . It's part of Metro (JAX-WS reference implementation), but it can be used standalone.