如何通过脚轮生成的 object 在 XML 中按属性值查找元素

Question

I am having trouble looking up elements by attribute value in the XML file via castor generated classes.

Castor does the mapping of XML to entity classes very good. However it doesn't provide means to find the element by name (assume that name is an attribute of the element). The API can only find an element by its index in the element list. At the moment it seems if I want to find an element by name I have to loop through the element list to find it. Because every class it unmarshalled has different fields it seems hard to write a generic method to find an element by name. Is there a better way to find an element from the element list by name?

Answer 1

Note: I'm the EclipseLink JAXB (MOXy) lead, and a member of the JAXB ( JSR-222 ) expert group.

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Not sure about Castor, but you can do this easy enough with EclipseLink JAXB (MOXy) .

Customer

Note how a condition [@name='address'] is specified on the mapping via the @XmlPath annotation:

package blog.predicate;

import java.util.List;

import javax.xml.bind.annotation.XmlAccessType;
import javax.xml.bind.annotation.XmlAccessorType;
import javax.xml.bind.annotation.XmlRootElement;
import javax.xml.bind.annotation.XmlType;

import org.eclipse.persistence.oxm.annotations.XmlPath;

@XmlRootElement(name="node")
@XmlType(propOrder={"firstName", "lastName", "address", "phoneNumbers"})
@XmlAccessorType(XmlAccessType.FIELD)
public class Customer {

    @XmlPath("node[@name='first-name']/text()")
    private String firstName;

    @XmlPath("node[@name='last-name']/text()")
    private String lastName;

    @XmlPath("node[@name='address']")
    private Address address;

    @XmlPath("node[@name='phone-number']")
    private List<PhoneNumber> phoneNumbers;

}

XML

<?xml version="1.0" encoding="UTF-8"?>
<node>
   <node name="first-name">Jane</node>
   <node name="last-name">Doe</node>
   <node name="address">
      <node name="street">123 A Street</node>
   </node>
   <node name="phone-number" type="work">555-1111</node>
   <node name="phone-number" type="cell">555-2222</node>
</node>

For More Information

• http://bdoughan.blogspot.com/2011/03/map-to-element-based-on-attribute-value.html