（Hash）Map的序列化程序供泽西使用？

（Hash）Map的序列化程序供泽西使用？

注意： 我是 Eclipselink
JAXB（MOXy）的
负责人，并且是
JAXB（JSR-222） 专家组的成员。

如果您正在使用MOXy，则以下内容将起作用，并且应与任何其他JAXB提供程序一起使用。这种方法转换

java.util.Map

成

org.w3c.dom.Element

使用

XmlAdapter

。

MapAdapter

An

XmlAdapter

允许您将一个类的实例封送为另一个类的实例（请参阅：http : //blog.bdoughan.com/2010/07/xmladapter-jaxbs-
secret-weapon.html）。

package forum11353790;import java.util.*;import java.util.Map.Entry;import javax.xml.bind.annotation.adapters.XmlAdapter;import javax.xml.parsers.*;import org.w3c.dom.*;public class MapAdapter extends XmlAdapter<Element, Map<String, String>> {    private documentBuilder documentBuilder;    public MapAdapter() throws Exception {        documentBuilder = documentBuilderFactory.newInstance().newdocumentBuilder();    }    @Override    public Element marshal(Map<String, String> map) throws Exception {        document document = documentBuilder.newdocument();        Element rootElement = document.createElement("data");        document.appendChild(rootElement);        for(Entry<String,String> entry : map.entrySet()) { Element childElement = document.createElement(entry.getKey()); childElement.setTextContent(entry.getValue()); rootElement.appendChild(childElement);        }        return rootElement;    }    @Override    public Map<String, String> unmarshal(Element rootElement) throws Exception {        NodeList nodeList = rootElement.getChildNodes();        Map<String,String> map = new HashMap<String, String>(nodeList.getLength());        for(int x=0; x<nodeList.getLength(); x++) { Node node = nodeList.item(x); if(node.getNodeType() == Node.ELEMENT_NODE) {     map.put(node.getNodeName(), node.getTextContent()); }        }        return map;    }}

人

您指定一个字段/属性应

XmlAdapter

通过

@XmlJavaTypeAdapter

注释利用。

package forum11353790;import java.io.Serializable;import java.util.*;import javax.xml.bind.annotation.*;import javax.xml.bind.annotation.adapters.XmlJavaTypeAdapter;@XmlAccessorType( XmlAccessType.FIELD )@XmlRootElementpublic class Person implements Serializable {    private String firstname;    private String lastname;    private List< Address > addresses = new ArrayList< Address >();    @XmlAnyElement    @XmlJavaTypeAdapter(MapAdapter.class)    private Map< String, String > data = new HashMap< String, String >();}

地址

package forum11353790;import java.io.Serializable;import javax.xml.bind.annotation.*;@XmlAccessorType(XmlAccessType.FIELD)public class Address implements Serializable {    private String  street;    private String  city;    private String  state;    private String  country;    private String  postalpre;    private Integer addresstype;}

jaxb.properties

要将MOXy指定为JAXB提供程序，您需要

jaxb.properties

在与域模型相同的程序包中包含一个名为的文件，并包含以下条目（请参阅：http : //blog.bdoughan.com/2011/05/specifying-
eclipselink-moxy-as -your.html）。

javax.xml.bind.context.factory=org.eclipse.persistence.jaxb.JAXBContextFactory

演示版

下面是一个独立的示例，您可以运行它来证明一切正常。

package forum11353790;import java.io.FileInputStream;import java.util.*;import javax.xml.bind.*;import javax.xml.transform.stream.StreamSource;import org.eclipse.persistence.jaxb.JAXBContextProperties;public class Demo {    public static void main(String[] args) throws Exception {        Map<String, Object> properties = new HashMap<String,Object>(2);        properties.put(JAXBContextProperties.MEDIA_TYPE, "application/json");        properties.put(JAXBContextProperties.JSON_INCLUDE_ROOT, false);        JAXBContext jc = JAXBContext.newInstance(new Class[] {Person.class}, properties);        Unmarshaller unmarshaller = jc.createUnmarshaller();        StreamSource json = new StreamSource(new FileInputStream("src/forum11353790/input.json"));        Person person = unmarshaller.unmarshal(json, Person.class).getValue();        Marshaller marshaller = jc.createMarshaller();        marshaller.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, true);        marshaller.marshal(person, System.out);    }}

input.json /输出

{   "firstname" : "Jimmy",   "lastname" : "Johns",   "addresses" : [ {      "street" : "19 Mayberry Drive",      "city" : "Mayberry",      "state" : "nc",      "country" : "us",      "postalpre" : "27043",      "addresstype" : 1   } ],   "data" : {      "sandwich" : "roast beef",      "hair" : "brown",      "eyes" : "blue"   }}

MOXy和JAX-RS / Jersey

您可以通过利用该类在JAX-RS环境中利用MOXy

MOXyJsonProvider

：

• http://blog.bdoughan.com/2012/05/moxy-as-your-jax-rs-json-provider.html