Java 困难的JAXB映射
我试图在一个更大的文档中映射以下XML结构,显然这不是XML的最大用途,但这是我必须处理的 为清晰起见,简化了示例:Java 困难的JAXB映射,java,jaxb,Java,Jaxb,我试图在一个更大的文档中映射以下XML结构,显然这不是XML的最大用途,但这是我必须处理的 为清晰起见,简化了示例: <details> <pictures> <picture1> http://domain.com/path/picture1.jpg </picture1> <picture2> http://domain.com/path/picture
<details>
<pictures>
<picture1>
http://domain.com/path/picture1.jpg
</picture1>
<picture2>
http://domain.com/path/picture2.jpg
</picture2>
<picture3>
http://domain.com/path/picture3.jpg
</picture3>
<picture4>
http://domain.com/path/picture4.jpg
</picture4>
<picture5>
http://domain.com/path/picture5.jpg
</picture5>
<picture6>
http://domain.com/path/picture6.jpg
</picture6>
<picture7>
http://domain.com/path/picture7.jpg
</picture7>
</pictures>
</details>
http://domain.com/path/picture1.jpg
http://domain.com/path/picture2.jpg
http://domain.com/path/picture3.jpg
http://domain.com/path/picture4.jpg
http://domain.com/path/picture5.jpg
http://domain.com/path/picture6.jpg
http://domain.com/path/picture7.jpg
本文档有一个DTD,它声明最多有30个不同的图片元素,编号为1-30,名称为
我想做的是,而不是为这些元素中的每一个创建30个不同的类,称为Picture1、Picture2、Picture3。。。等等我只想使用一个Picture类,并将其用于所有30个唯一的元素名称
以下是我到目前为止所做的尝试
@XmlRootElement
public class Details {
...
@XmlElementWrapper
@XmlElementRefs({
@XmlElementRef( name="picture1", type=Picture.class ),
@XmlElementRef( name="picture2", type=Picture.class ),
@XmlElementRef( name="picture3", type=Picture.class ),
@XmlElementRef( name="picture4", type=Picture.class ),
@XmlElementRef( name="picture5", type=Picture.class ),
@XmlElementRef( name="picture6", type=Picture.class ),
@XmlElementRef( name="picture7", type=Picture.class ),
@XmlElementRef( name="picture8", type=Picture.class ),
@XmlElementRef( name="picture9", type=Picture.class ),
@XmlElementRef( name="picture10", type=Picture.class ),
@XmlElementRef( name="picture11", type=Picture.class ),
@XmlElementRef( name="picture12", type=Picture.class ),
@XmlElementRef( name="picture13", type=Picture.class ),
@XmlElementRef( name="picture14", type=Picture.class ),
@XmlElementRef( name="picture15", type=Picture.class ),
@XmlElementRef( name="picture16", type=Picture.class ),
@XmlElementRef( name="picture17", type=Picture.class ),
@XmlElementRef( name="picture18", type=Picture.class ),
@XmlElementRef( name="picture19", type=Picture.class ),
@XmlElementRef( name="picture20", type=Picture.class ),
@XmlElementRef( name="picture21", type=Picture.class ),
@XmlElementRef( name="picture22", type=Picture.class ),
@XmlElementRef( name="picture23", type=Picture.class ),
@XmlElementRef( name="picture24", type=Picture.class ),
@XmlElementRef( name="picture25", type=Picture.class ),
@XmlElementRef( name="picture26", type=Picture.class ),
@XmlElementRef( name="picture27", type=Picture.class ),
@XmlElementRef( name="picture28", type=Picture.class ),
@XmlElementRef( name="picture29", type=Picture.class ),
@XmlElementRef( name="picture30", type=Picture.class )
})
public List<Picture> getPictures() {
return this.pictures;
}
public void setPictures( List<Pictures> pictures ) {
this.pictures = pictures;
}
...
}
@XmlElementWrapper
public class Picture {
...
}
@XmlRootElement
公开课详情{
...
@XmlElementWrapper
@XmlElementRefs({
@xmlementref(name=“picture1”,type=Picture.class),
@xmlementref(name=“picture2”,type=Picture.class),
@xmlementref(name=“picture3”,type=Picture.class),
@xmlementref(name=“picture4”,type=Picture.class),
@xmlementref(name=“picture5”,type=Picture.class),
@xmlementref(name=“picture6”,type=Picture.class),
@xmlementref(name=“picture7”,type=Picture.class),
@xmlementref(name=“picture8”,type=Picture.class),
@xmlementref(name=“picture9”,type=Picture.class),
@xmlementref(name=“picture10”,type=Picture.class),
@xmlementref(name=“picture11”,type=Picture.class),
@xmlementref(name=“picture12”,type=Picture.class),
@xmlementref(name=“picture13”,type=Picture.class),
@xmlementref(name=“picture14”,type=Picture.class),
@xmlementref(name=“picture15”,type=Picture.class),
@xmlementref(name=“picture16”,type=Picture.class),
@xmlementref(name=“picture17”,type=Picture.class),
@xmlementref(name=“picture18”,type=Picture.class),
@xmlementref(name=“picture19”,type=Picture.class),
@xmlementref(name=“picture20”,type=Picture.class),
@xmlementref(name=“picture21”,type=Picture.class),
@xmlementref(name=“picture22”,type=Picture.class),
@xmlementref(name=“picture23”,type=Picture.class),
@xmlementref(name=“picture24”,type=Picture.class),
@xmlementref(name=“picture25”,type=Picture.class),
@xmlementref(name=“picture26”,type=Picture.class),
@xmlementref(name=“picture27”,type=Picture.class),
@xmlementref(name=“picture28”,type=Picture.class),
@xmlementref(name=“picture29”,type=Picture.class),
@xmlementref(name=“picture30”,type=Picture.class)
})
公共列表getPictures(){
归还这张照片;
}
公共图片(列出图片){
这个。图片=图片;
}
...
}
@XmlElementWrapper
公开课图片{
...
}
这会导致getPictures始终返回null
此外,我还尝试将Picture类上的注释更改为@xmlementwrapper(name=“picture1”)
,这导致我得到一个从getPictures()返回的列表,但它只包含
元素,而不包含其余元素
我知道我可以求助于获取JAXBElement对象的列表,但如果可以避免的话,我宁愿不要。您知道如何映射此用例吗?有几种方法可以处理此用例: 选项#1 通过利用
@xmlements
,您可以做到以下几点:
package forum10109418;
import java.util.List;
import javax.xml.bind.annotation.*;
@XmlRootElement
public class Details {
private List<Picture> pictures;
@XmlElementWrapper
@XmlElements({
@XmlElement( name="picture1", type=Picture.class ),
@XmlElement( name="picture2", type=Picture.class ),
@XmlElement( name="picture3", type=Picture.class ),
@XmlElement( name="picture4", type=Picture.class ),
@XmlElement( name="picture5", type=Picture.class ),
@XmlElement( name="picture6", type=Picture.class ),
@XmlElement( name="picture7", type=Picture.class ),
@XmlElement( name="picture8", type=Picture.class ),
@XmlElement( name="picture9", type=Picture.class ),
@XmlElement( name="picture10", type=Picture.class ),
@XmlElement( name="picture11", type=Picture.class ),
@XmlElement( name="picture12", type=Picture.class ),
@XmlElement( name="picture13", type=Picture.class ),
@XmlElement( name="picture14", type=Picture.class ),
@XmlElement( name="picture15", type=Picture.class ),
@XmlElement( name="picture16", type=Picture.class ),
@XmlElement( name="picture17", type=Picture.class ),
@XmlElement( name="picture18", type=Picture.class ),
@XmlElement( name="picture19", type=Picture.class ),
@XmlElement( name="picture20", type=Picture.class ),
@XmlElement( name="picture21", type=Picture.class ),
@XmlElement( name="picture22", type=Picture.class ),
@XmlElement( name="picture23", type=Picture.class ),
@XmlElement( name="picture24", type=Picture.class ),
@XmlElement( name="picture25", type=Picture.class ),
@XmlElement( name="picture26", type=Picture.class ),
@XmlElement( name="picture27", type=Picture.class ),
@XmlElement( name="picture28", type=Picture.class ),
@XmlElement( name="picture29", type=Picture.class ),
@XmlElement( name="picture30", type=Picture.class )
})
public List<Picture> getPictures() {
return this.pictures;
}
public void setPictures( List<Picture> pictures ) {
this.pictures = pictures;
}
}
然后使用StreamReaderDelegate
切掉数字后缀:
package forum10109418;
import java.io.FileInputStream;
import javax.xml.bind.*;
import javax.xml.stream.*;
import javax.xml.stream.util.StreamReaderDelegate;
public class Demo {
public static void main(String[] args) throws Exception {
JAXBContext jc = JAXBContext.newInstance(Details.class);
XMLInputFactory xif = XMLInputFactory.newFactory();
XMLStreamReader xsr = xif.createXMLStreamReader(new FileInputStream("src/forum10109418/input.xml"));
xsr = new StreamReaderDelegate(xsr) {
@Override
public String getLocalName() {
String localName = super.getLocalName();
if(localName.startsWith("picture") && !localName.equals("pictures")) {
return "picture";
}
return localName;
}
};
Unmarshaller unmarshaller = jc.createUnmarshaller();
Details details = (Details) unmarshaller.unmarshal(xsr);
System.out.println(details.getPictures().size());
}
}
选项#3
如果您使用的是提供程序,那么您可以使用我们添加的@XmlVariableNode
扩展:
@xmlements
,您可以做到以下几点:
package forum10109418;
import java.util.List;
import javax.xml.bind.annotation.*;
@XmlRootElement
public class Details {
private List<Picture> pictures;
@XmlElementWrapper
@XmlElements({
@XmlElement( name="picture1", type=Picture.class ),
@XmlElement( name="picture2", type=Picture.class ),
@XmlElement( name="picture3", type=Picture.class ),
@XmlElement( name="picture4", type=Picture.class ),
@XmlElement( name="picture5", type=Picture.class ),
@XmlElement( name="picture6", type=Picture.class ),
@XmlElement( name="picture7", type=Picture.class ),
@XmlElement( name="picture8", type=Picture.class ),
@XmlElement( name="picture9", type=Picture.class ),
@XmlElement( name="picture10", type=Picture.class ),
@XmlElement( name="picture11", type=Picture.class ),
@XmlElement( name="picture12", type=Picture.class ),
@XmlElement( name="picture13", type=Picture.class ),
@XmlElement( name="picture14", type=Picture.class ),
@XmlElement( name="picture15", type=Picture.class ),
@XmlElement( name="picture16", type=Picture.class ),
@XmlElement( name="picture17", type=Picture.class ),
@XmlElement( name="picture18", type=Picture.class ),
@XmlElement( name="picture19", type=Picture.class ),
@XmlElement( name="picture20", type=Picture.class ),
@XmlElement( name="picture21", type=Picture.class ),
@XmlElement( name="picture22", type=Picture.class ),
@XmlElement( name="picture23", type=Picture.class ),
@XmlElement( name="picture24", type=Picture.class ),
@XmlElement( name="picture25", type=Picture.class ),
@XmlElement( name="picture26", type=Picture.class ),
@XmlElement( name="picture27", type=Picture.class ),
@XmlElement( name="picture28", type=Picture.class ),
@XmlElement( name="picture29", type=Picture.class ),
@XmlElement( name="picture30", type=Picture.class )
})
public List<Picture> getPictures() {
return this.pictures;
}
public void setPictures( List<Picture> pictures ) {
this.pictures = pictures;
}
}
然后使用StreamReaderDelegate
切掉数字后缀:
package forum10109418;
import java.io.FileInputStream;
import javax.xml.bind.*;
import javax.xml.stream.*;
import javax.xml.stream.util.StreamReaderDelegate;
public class Demo {
public static void main(String[] args) throws Exception {
JAXBContext jc = JAXBContext.newInstance(Details.class);
XMLInputFactory xif = XMLInputFactory.newFactory();
XMLStreamReader xsr = xif.createXMLStreamReader(new FileInputStream("src/forum10109418/input.xml"));
xsr = new StreamReaderDelegate(xsr) {
@Override
public String getLocalName() {
String localName = super.getLocalName();
if(localName.startsWith("picture") && !localName.equals("pictures")) {
return "picture";
}
return localName;
}
};
Unmarshaller unmarshaller = jc.createUnmarshaller();
Details details = (Details) unmarshaller.unmarshal(xsr);
System.out.println(details.getPictures().size());
}
}
选项#3
如果您使用的是提供程序,那么您可以使用我们添加的@XmlVariableNode
扩展: