XML轉Java實體對象

1.當拿到的xml是String 類型的

String xml = "<User>" +
        "<name>張三</name>" +
        "<sex>男</sex>" +
        "<age>28</age>" +
        "</User>";

通過下面方法就可以轉成java對象

public static <T> T xmlToBean(String xmlPath,Class<T> load) throws JAXBException {
    JAXBContext context = JAXBContext.newInstance(load);
    Unmarshaller unmarshaller = context.createUnmarshaller();
    return (T) unmarshaller.unmarshal(new StringReader(xmlPath));
}

Java對象需要@XmlAccessorType(XmlAccessType.FIELD)；@XmlType；@XmlRootElement(name = "User")注釋用來映射

@Data
@JsonSerialize
@XmlAccessorType(XmlAccessType.FIELD)
@XmlType(name = "",propOrder = {
        "name",
        "age",
        "sex"
})
@XmlRootElement(name = "User")
public class User {
    private  String name;
    private  Integer age;
    private  String sex;


}

最后直接調用方法就可以

User user = (User) JaxbUtil.xmlToBean(xml, User.class);


2.當拿到的xml與實體類的屬性名不一致時，將@XmlType注釋換成@XmlElement(name = "Name", required = true)單獨為每個屬性注釋，

@Data
@JsonSerialize
@XmlAccessorType(XmlAccessType.FIELD)
@XmlRootElement(name = "User")
public class User {
    @XmlElement(name = "Name", required = true)
    private  String name;
    @XmlElement(name = "Age", required = true)
    private  Integer age;
    @XmlElement(name = "Sex", required = true)
    private  String sex;
}

3.當拿到的xml不是String類型是，是NoteList對象；需要先轉為String在轉為對象

MessageElement[] elements = value.get_any();

調用轉換方法
List<HicOutBoundDTO> outboundlist = (List<HicOutBoundDTO>) JaxbUtil.xmlToString(HicOutBoundDTO.class,elements,"Outbound");

該方法是直接轉為對象的List集合了
public static <T> T xmlToString(Class<T> load, MessageElement[] elements, String table) {
    try{
        NodeList outbound = elements[1].getElementsByTagName(table);
        List<Object> listDto = new ArrayList<>() ;
        for(int i=0;i<outbound.getLength();i++){
            Element node = (Element)outbound.item(i);
            TransformerFactory transFactory = TransformerFactory.newInstance();
            Transformer transformer = transFactory.newTransformer();
            StringWriter buffer = new StringWriter();
            transformer.setOutputProperty(OutputKeys.OMIT_XML_DECLARATION, "yes");
            transformer.transform(new DOMSource(node),
                    new StreamResult(buffer));
            String str = buffer.toString();
　　　　　　　　//再轉為java對象
            JAXBContext context = JAXBContext.newInstance(load);
            Unmarshaller unmarshaller = context.createUnmarshaller();
            listDto.add(unmarshaller.unmarshal(new StringReader(str)));
        }
        return (T)listDto;
    }
    catch(Exception e)
    {
        return null;
    }
}

4需要一個一個的值拿出來的時候

Element node = (Element)outbound.item(0);
node.getElementsByTagName("DeliveyType").item(0).getFirstChild().getNodeValue();