java xml怎么作用的_如何使用JAXB解析Java中的XML？

小编典典

您可以执行以下操作。通过利用，@XmlElementWrapper您可以减少所需的类数量：

福斯特之家

package nov18;

import java.util.List;

import javax.xml.bind.annotation.*;

@XmlRootElement(name="FosterHome")

@XmlAccessorType(XmlAccessType.FIELD)

public class FosterHome {

@XmlElement(name="Orphanage")

private String orphanage;

@XmlElement(name="Location")

private String location;

@XmlElementWrapper(name="Families")

@XmlElement(name="Family")

private List families;

@XmlElementWrapper(name="RemainingChildList")

@XmlElement(name="ChildID")

private List remainingChildren;

}

家庭

package nov18;

import java.util.List;

import javax.xml.bind.annotation.*;

@XmlAccessorType(XmlAccessType.FIELD)

public class Family {

@XmlElement(name="ParentID")

private String parentID;

@XmlElementWrapper(name="ChildList")

@XmlElement(name="ChildID")

private List childList;

}

演示版

package nov18;

import java.io.File;

import javax.xml.bind.*;

public class Demo {

public static void main(String[] args) throws Exception {

JAXBContext jc = JAXBContext.newInstance(FosterHome.class);

Unmarshaller unmarshaller = jc.createUnmarshaller();

FosterHome fosterHome = (FosterHome) unmarshaller.unmarshal(new File("src/nov18/input.xml"));

Marshaller marshaller = jc.createMarshaller();

marshaller.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, true);

marshaller.marshal(fosterHome, System.out);

}

}

输入输出

Happy Days Daycare

Apple Street

Adams

Child1

Child2

Adams

Child3

Child4

Child5

Child6

想要查询更多的信息

更新

有没有简单的方法可以迭代/打印出Family类中的所有ChildID？

您可以执行以下操作：

for(Family family : fosterHome.getFamilies()) {

System.out.println(family.getParentID());

for(String childID : family.getChildList()) {

System.out.println(" " + childID);

}

}

2020-09-15