[英]JAXB unmarshal XML with a parent element in a child element
我已經四處尋找和搜尋,但找不到我的問題的答案。 我有一個具有以下結構的XML文件:
<!DOCTYPE persons [
<!ELEMENT lastname (#PCDATA)>
<!ELEMENT firstname (#PCDATA)>
<!ELEMENT residence (#PCDATA)>
<!ELEMENT children (person*)>
<!ELEMENT person (firstname, (lastname?), (children?), (residence?))>
<!ELEMENT persons (person+)>
<!ATTLIST person id ID #REQUIRED>
<!ATTLIST person friends IDREFS #IMPLIED>
<!ATTLIST persons file CDATA #IMPLIED>
]>
<persons file="this">
<person id="p-1">
<firstname>Homer</firstname>
<lastname>Simpson</lastname>
<residence>Springfield</residence>
<children>
<person id="p-3">
<firstname>Bart</firstname>
<residence>Springfield</residence>
</person>
</children>
</person>
<person id="p-2" friends="p-1">
<firstname>Ned</firstname>
<lastname>Flanders</lastname>
<residence>Springfield</residence>
</person>
</persons>
我的Java文件如下:
人員.java
@XmlRootElement(name="persons")
public class Persons {
@XmlAttribute(name="file")
private String file;
@XmlElement(name="person")
private List<Person> persons;
/* setters and getters */
}
人.java
public class Person {
@XmlAttribute(name="id")
private String id;
@XmlAttribute(name="friends")
private String friends;
private String firstname;
private String lastname;
private String residence;
private List<Children> children;
/* getters and setters */
}
Children.java
public class Children {
private List<Person> persons;
/* getters and setters */
}
注意:我在對象變量上使用了注釋,因為我不想寫下getter和setter。 我知道,否則@XmlAccessorType(XmlAccessType.FIELD)
是必需的。
因此, <children>
實際上可以有一個或多個<person>
作為孩子。 我想我對不同的列表感到困惑。 當我通過使用簡單的System.out.println()
命令對每個人解組給定的XML文件來簡單地測試它時,我看到每個元素和屬性都具有正確的值,但是person.getChildren()
始終返回null。 我做錯了什么?
在您的兒童班上,您忘記添加
@XmlElement(name="person")
進入兒童班的人員名單。 所以它應該看起來像這樣:
public class Children {
private List<Person> persons;
public List<Person> getPersons() {
return persons;
}
@XmlElement(name="person") // MISSING ANNOTATION
public void setPersons(List<Person> persons) {
this.persons = persons;
}
}
添加后,我的輸出是:
Persons = [
file: this,
persons: [
Person = [
id=p-1,
freinds=null,
firstName=Homer,
lastName=Simpson,
residence=Springfield,
children=[
Children = [
persons=[
Person = [
id=p-3,
freinds=null,
firstName=Bart,
lastName=null,
residence=Springfield,
children=null
]
]
]
]
],
Person = [
id=p-2,
freinds=p-1,
firstName=Ned,
lastName=Flanders,
residence=Springfield,
children=null
]
]
]
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