javax.xml处理接口类型字段的xml转换

最新推荐文章于 2025-09-22 19:43:43 发布

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本文探讨了在使用JAXB进行XML序列化时遇到的问题，特别是当遇到接口类型的属性时，JAXB无法直接处理这种情况。文章提供了两种解决方案：一是通过@XmlTransient注解忽略接口属性；二是自定义一个转换器来实现接口类型的序列化。

javax.xml在转换接口类型的属性到xml时，会抛出以下异常：

Exception in thread "main" com.sun.xml.internal.bind.v2.runtime.IllegalAnnotationsException: 1 counts of IllegalAnnotationExceptions
java.io.Serializable is an interface, and JAXB can't handle interfaces.
this problem is related to the following location:
at java.io.Serializable
at protected java.io.Serializable xml.SuperVO.id
at xml.SuperVO
at xml.RootVO

有两种解决方法：

1，直接忽略掉接口类型的属性

import java.io.Serializable;
import javax.xml.bind.annotation.XmlAccessType;
import javax.xml.bind.annotation.XmlAccessorType;
import javax.xml.bind.annotation.XmlTransient;
@XmlAccessorType(XmlAccessType.FIELD)
public abstract class SuperVO
{
@XmlTransient
protected Serializable id = "siddddddd";

public Serializable getId()
{
return id;
}
public void setId(Serializable id)
{
this.id = id;
}
}

2，自行实现一个转换器：

import java.io.Serializable;
import javax.xml.bind.annotation.adapters.XmlAdapter;
import javax.xml.bind.annotation.adapters.XmlJavaTypeAdapter;
public abstract class SuperVO
{
protected Serializable id;

@XmlJavaTypeAdapter(SerializableAdapter.class)
public Serializable getId()
{
return this.id;
}

private class SerializableAdapter extends XmlAdapter<String, Serializable>
{
@Override
public Serializable unmarshal(String v) throws Exception
{
return v;
}
@Override
public String marshal(Serializable v) throws Exception
{
if(v == null)
{
return "";
}

return v.toString();
}
}
public void setId(Serializable id)
{
this.id = id;
}
}