Deserializzazione XML su POJO utilizzando Jackson XmlMapper

Question

Utilizzando le annotazioni Jackson XmlMapper, come avrei deserializzato questo XML in un pojo?

<?xml version="1.0" encoding="UTF-8"?> 
<open> 
    <creds priv="write" type="internal"> 
     <user>Username1</user> 
     <client_token>abcplaudzrbcy37c</client_token> 
     <client_secret>0cxDE3LE0000=</client_secret> 
    </creds> 
    <creds priv="read" type="internal"> 
     <user>Username1</user> 
     <client_token>123plaudzrbcy37c</client_token> 
     <client_secret>0cxDE3LE1234=</client_secret> 
    </creds> 
    <creds priv="none" type="internal"> 
     <user>Username1</user> 
     <client_token>000plaudzrbcy37c</client_token> 
     <client_secret>0cxDE3LEabcd=</client_secret> 
    </creds> 
</open> 

ho tentato di usare qualcosa di simile:

@JacksonXmlRootElement(localName = "Open") 
public class OpenCredentials { 

    @JacksonXmlProperty(localName = "Credentials") 
    private Credentials[] credentials; 

} 


class Credentials { 

    @JacksonXmlProperty(isAttribute = true) 
    private String priv; 

    @JacksonXmlProperty(isAttribute = true) 
    private String type; 

    @JacksonXmlProperty(localName = "Creds") 
    private Creds[] creds; 
} 


class Creds { 

    @JacksonXmlText(value = true) 
    private String user; 

    @JacksonXmlText(value = true) 
    private String client_token; 

    @JacksonXmlText(value = true) 
    private String client_secret; 
} 

Quando ho provato ad usare di XmlMapper readValue(), ottengo il seguente errore:

com.fasterxml.jackson.databind.JsonMappingException: Duplicate property '' for [simple type, class com.company.data.utils.api.Creds] 
at com.fasterxml.jackson.databind.deser.DeserializerCache._createAndCache2(DeserializerCache.java:268) 
at com.fasterxml.jackson.databind.deser.DeserializerCache._createAndCacheValueDeserializer(DeserializerCache.java:243) 

Answer 1

vostri POJO classi non lo fanno adattarsi al tuo XML. La struttura è più semplice di quanto pensassi. Vedi sotto Esempio:

@JacksonXmlRootElement(localName = "open") 
class OpenCredentials { 

    @JacksonXmlProperty(localName = "creds") 
    @JacksonXmlElementWrapper(useWrapping = false) 
    private Credentials[] credentials; 

    //getters, setters, toString 
} 


class Credentials { 

    @JacksonXmlProperty(isAttribute = true) 
    private String priv; 

    @JacksonXmlProperty(isAttribute = true) 
    private String type; 

    private String user; 

    @JacksonXmlProperty(localName = "client_token") 
    private String clientToken; 

    @JacksonXmlProperty(localName = "client_secret") 
    private String clientSecret; 

    //getters, setters, toString 
} 

utilizzo semplice:

XmlMapper mapper = new XmlMapper(); 
OpenCredentials openCredentials = mapper.readValue(XML, OpenCredentials.class); 
System.out.println(openCredentials); 

Sopra programma stampa (per la vostra XML):

OpenCredentials{credentials=[Credentials{priv='write', type='internal', user='Username1', client_token='abcplaudzrbcy37c', client_secret='0cxDE3LE0000='}, Credentials{priv='read', type='internal', user='Username1', client_token='123plaudzrbcy37c', client_secret='0cxDE3LE1234='}, Credentials{priv='none', type='internal', user='Username1', client_token='000plaudzrbcy37c', client_secret='0cxDE3LEabcd='}]} 

Consulta anche:

1. jackson-dataformat-xml.
2. Home: Jackson XML databind Wiki.