用于解组对象的文件中的JAXB位置 [英] JAXB location in file for unmarshalled objects

问题描述

我有一些对象是由JAXB从XML文件解组的。是否有可能让JAXB告诉我或以某种方式找出每个对象来自XML文件（行和列）的位置？

I have some objects being unmarshalled from an XML file by JAXB. Is it possible to have JAXB tell me or somehow find out where in the XML file (line and column) each object comes from?

此信息在某些时候可用，因为JAXB在架构验证错误期间将它提供给我。但是我也想让它可用于经过验证的对象。

This information is available at some point, because JAXB gives it to me during schema validation errors. But I would like to have it available for validated objects too.

推荐答案

你可以通过利用<$ c在JAXB中做到这一点$ c> XMLStreamReader 和 Unmarshaller.Listener ：

演示

package forum383861;

import java.io.FileInputStream;
import java.util.HashMap;
import java.util.Map;

import javax.xml.bind.JAXBContext;
import javax.xml.bind.Unmarshaller;
import javax.xml.bind.Unmarshaller.Listener;
import javax.xml.stream.Location;
import javax.xml.stream.XMLInputFactory;
import javax.xml.stream.XMLStreamReader;

public class Demo {

    public static void main(String[] args) throws Exception {
        JAXBContext jc = JAXBContext.newInstance(Customer.class);


        XMLInputFactory xif = XMLInputFactory.newFactory();
        FileInputStream xml = new FileInputStream("src/forum383861/input.xml");
        XMLStreamReader xsr = xif.createXMLStreamReader(xml);

        Unmarshaller unmarshaller = jc.createUnmarshaller();
        LocationListener ll = new LocationListener(xsr);
        unmarshaller.setListener(ll);

        Customer customer = (Customer) unmarshaller.unmarshal(xsr);
        System.out.println(ll.getLocation(customer));
        System.out.println(ll.getLocation(customer.getAddress()));
    }

    private static class LocationListener extends Listener {

        private XMLStreamReader xsr;
        private Map<Object, Location> locations;

        public LocationListener(XMLStreamReader xsr) {
            this.xsr = xsr;
            this.locations = new HashMap<Object, Location>();
        }

        @Override
        public void beforeUnmarshal(Object target, Object parent) {
            locations.put(target, xsr.getLocation());
        }

        public Location getLocation(Object o) {
            return locations.get(o);
        }

    }

}

input.xml

<?xml version="1.0" encoding="UTF-8"?>
<customer>
    <address/>
</customer>

输出

[row,col {unknown-source}]: [2,1]
[row,col {unknown-source}]: [3,5]

客户

package forum383861;

import javax.xml.bind.annotation.XmlRootElement;

@XmlRootElement
public class Customer {

    private Address address;

    public Address getAddress() {
        return address;
    }

    public void setAddress(Address address) {
        this.address = address;
    }

}

地址

package forum383861;

public class Address {

}

更多信息

• http://blog.bdoughan.com/2011/08/using-unmarshallerlistener-to-capture.html

• http://blog.bdoughan.com/2011/08/using-unmarshallerlistener-to-capture.html

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