[英]How to ignore a field from binding to XML with JAXB
我有一個像這樣的簡單班級
import nl.hu.pf.coproco.model.Observeable;
@XmlRootElement (name = "Purpose")
@XmlAccessorType (XmlAccessType.FIELD)
public class Purpose implements Observeable{
private String name;
private ArrayList<Observer> observers;
@XmlElement (name = "subPurpose")
private ArrayList<Purpose> subPurposes;
//methods
}
但是Observable是一個接口,所以我得到一個例外,因為JAXB無法處理接口。 我試圖弄清楚如何使用ArrayList<Observer>
忽略該字段,因此不會將其導出到xml。
我嘗試使用@XmlTransient
批注,但是得到以下接收信號javax.xml.bind.UnmarshalException: unexpected element (uri:"", local:"purpose"). Expected elements are <{}Purpose>
javax.xml.bind.UnmarshalException: unexpected element (uri:"", local:"purpose"). Expected elements are <{}Purpose>
取消編組但我也想編組該類時發生這種情況
樣本XML
<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<purpose>
<name>All Purposes</name>
<subPurpose>
<name>Creational</name>
</subPurpose>
<subPurpose>
<name>Structural</name>
</subPurpose>
<subPurpose>
<name>Behavioral</name>
<subPurpose>
<name>Behavioral 1</name>
</subPurpose>
<subPurpose>
<name>Behavioral 2</name>
</subPurpose>
</subPurpose>
</purpose>
接口Observable
看起來像這樣:
public interface Observeable {
public void registerObserver(Observer o);
public void removeObserver(Observer o);
public void notifyObservers(Object o, String arg);
}
您的xml包含purpose
而非Purpose
因此將@XmlRootElement(name = "Purpose")
更改為
@XmlRootElement(name = "purpose")
並在這樣的觀察者上添加@XmlTransient
@XmlTransient
private ArrayList<Observer> observers;
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