javax.xml处理接口类型字段的xml转换

「爱情、让人受尽委屈。」 2022-07-16 03:45 107阅读 0赞

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;  
\}  
\}