Java 使用Jackson XmlMapper将XML反序列化到POJO
使用Jackson XmlMapper注释,我如何将该XML反序列化为pojoJava 使用Jackson XmlMapper将XML反序列化到POJO,java,xml,jackson,deserialization,Java,Xml,Jackson,Deserialization,使用Jackson XmlMapper注释,我如何将该XML反序列化为pojo <?xml version="1.0" encoding="UTF-8"?> <open> <creds priv="write" type="internal"> <user>Username1</user> <client_token>abcplaudzrbcy37c</client_token>
<?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>
当我尝试使用XmlMapper的readValue()时,出现以下错误:
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)
您的
POJO
类不适合您的XML
。结构比你想象的要简单。请参见以下示例:
@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
}
简单用法:
XmlMapper mapper = new XmlMapper();
OpenCredentials openCredentials = mapper.readValue(XML, OpenCredentials.class);
System.out.println(openCredentials);
以上程序打印(用于您的XML
):
另见:
我在JacksonXmlElementWrapper注释中设置了“unrecognized field”,在拆分为@MichalZiober示例后,反序列化工作正常
XmlMapper mapper = new XmlMapper();
OpenCredentials openCredentials = mapper.readValue(XML, OpenCredentials.class);
System.out.println(openCredentials);
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='}]}