如何在具有相同标记名称的java中解组嵌套子元素？

Question

In Java I am able to read XML by adding the values into my POJO. But I am not sure how would I able to do the same with sub-child nodes. I provided my POJO example and the XML sub class node.

XML:

<results>
    <rootNode>
        <node>1336</node>
        <state>CL</state>
        <time>0</time>
        <ip_addresses>
             <ip_address type="DOC">06:56:43.0</ip_address>
             <ip_address type="PE">06:56:43.0</ip_address>
        </ip_addresses>
        <lease_date>2017-01-25</lease_date>
    </rootNode>
</results>

POJO:

@XmlRootElement(name = "rootNode")
@XmlAccessorType (XmlAccessType.FIELD)
public class readingXml
{
    private int id;

    @XmlElement(name = "node")
    private String node;
    @XmlElement(name = "state")
    private String state;

    // How to do the same with sub child-nodes
    @XmlElement(name = "ip_addresses")
    private String ip_addresses;
    // What to do here?

    @XmlElement(name = "lease_date")
    private String lease_date;

    // Getters and setters for all above

Answer 1

You need to put something like this:

@XmlElement(name = "ip_addresses")
private IPAddresses ipAddresses;

and IPAddresses POJO class:

@XmlRootElement(name = "ip_addresses")
@XmlAccessorType(XmlAccessType.FIELD)
public class IPAddresses implements Serializable {
    private final static long serialVersionUID = 1L;

    @XmlElement(name = "ip_address")
    private List<IPAddress> ipAddresses;

    public List<IPAddress> getIpAddresses() {
        return ipAddresses;
    }
    public void setIpAddresses(List<IPAddress> ipAddresses) {
        this.ipAddresses = ipAddresses;
    }
}

Where IPAddress is another POJO class that describes the structure of the individual element.

@XmlRootElement(name = "ip_address")
@XmlAccessorType(XmlAccessType.FIELD)
public class IPAddress implements Serializable {
    private final static long serialVersionUID = 1L;
    @XmlValue
    protected String content;
    @XmlAttribute(name = "type")
    protected String type;

    public void setContent(String content) {
        this.content = content;
    }
    public String getContent() {
        return content;
    }

    public void setType(String content) {
        this.type = type;
    }
    public String getType() {
        return type;
    }
}

EDIT To print them do something like this:

for (IPAddress ipAddress in custinfo.getIpAddresses().getIpAddresses()) {
    System.out.println("value: " + ipAddress.getContent());
    System.out.println("type: " + ipAddress.getType());
}

Answer 2

You can change the type of "ip_addresses" from String to another POJO class.

Eg

   @XmlElement(name = "ip_addresses")
    private List<Address> ip_addresses;

And then define your Address POJO as

@XmlAccessorType(XmlAccessType.FIELD)
@XmlRootElement(name = "ip_addresses")
public class Address {

    @XmlElement(type = "DOC")
    protected String ip_address1;

    @XmlElement(type = "PE")
    protected String ip_address2;

    public String getIp_address1() {
        return ip_address1;
    }

    public void setIp_address1(String value) {
        this.ip_address1= value;
    }

    public String getIp_address2() {
        return ip_address2;
    }

    public void setIp_address2(String value) {
        this.ip_address2= value;
    }

}