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使用JAXB指定根节点和子节点

well-formed marshalling jaxb xml java

Thufir · 技术社区 · 6 年前

呆在里面 JAXB 我如何重构 MyNote 以便它 conforms 到:

<note>
    <to>Tove</to>
    <from>Jani</from>
    <heading>Reminder</heading>
    <body>Don't forget me this weekend!</body>
</note>

哪个 is 据我所知,结构良好但无效。电流输出:

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<MyNotes>
    <Note>
        <note>XY3Z1RGEO9W79LALCS</note>
        <to>LJAY9RNMUGGENGNND9</to>
        <from>GOVSHVZ3GJWC864L7X</from>
        <heading>EX6LGVE5LGY4A6B9SK</heading>
        <body>L95WYQNMEU1MFDRBG4</body>
    </Note>
</MyNotes>

它太平了,而不是像 example .

我相信这使 note 这个 root 元素,其他元素为 children 节点到 笔记 如果我用的是正确的术语。

这个 我的便笺本 班级:

package net.bounceme.dur.jaxb.hello.world;

import javax.xml.bind.annotation.XmlElement;
import javax.xml.bind.annotation.XmlRootElement;
import javax.xml.bind.annotation.XmlType;

@XmlType(propOrder = {"note", "to", "from", "heading", "body"})
@XmlRootElement(name = "note")
public class MyNote {

    private String note;
    private String to;
    private String from;
    private String heading;
    private String body;

    public String getNote() {
        return note;
    }

    @XmlElement(name = "note")
    public void setNote(String note) {
        this.note = note;
    }

    public String getTo() {
        return to;
    }

    @XmlElement(name = "to")
    public void setTo(String to) {
        this.to = to;
    }

    public String getFrom() {
        return from;
    }

    @XmlElement(name = "from")
    public void setFrom(String from) {
        this.from = from;
    }

    public String getHeading() {
        return heading;
    }

    @XmlElement(name = "heading")
    public void setHeading(String heading) {
        this.heading = heading;
    }

    public String getBody() {
        return body;
    }

    @XmlElement(name = "body")
    public void setBody(String body) {
        this.body = body;
    }

    @Override
    public String toString() {
        return note + to + from + heading + body;
    }

}

这个 MyNotes 班级:

package net.bounceme.dur.jaxb.hello.world;

import java.util.ArrayList;
import java.util.List;
import java.util.logging.Logger;
import javax.xml.bind.annotation.XmlElement;
import javax.xml.bind.annotation.XmlRootElement;

@XmlRootElement(name = "MyNotes")
public class MyNotes {

    private static final Logger LOG = Logger.getLogger(MyNotes.class.getName());

    private List<MyNote> myNotes = new ArrayList<>();

    public MyNotes() {
    }

    public List<MyNote> getMyNotes() {
        LOG.info(myNotes.toString());
        return myNotes;
    }

    @XmlElement(name = "Note")
    public void setMyNotes(List<MyNote> myNotes) {
        LOG.info(myNotes.toString());
        this.myNotes = myNotes;
    }

    public void add(MyNote myNote) {
        LOG.info(myNote.toString());
        myNotes.add(myNote);
    }

    @Override
    public String toString() {
        StringBuffer str = new StringBuffer();
        for (MyNote note : this.myNotes) {
            str.append(note.toString());
        }
        return str.toString();
    }

}

exercising 这个 我的便笺本 和 我的记事本 类别:

    public MyNotes unmarshallMyNotesFromFile(URI uri) throws Exception {
        File file = new File(uri);
        JAXBContext jaxbContext = JAXBContext.newInstance(MyNotes.class);
        Unmarshaller jaxbUnmarshaller = jaxbContext.createUnmarshaller();
        MyNotes myNotes = (MyNotes) jaxbUnmarshaller.unmarshal(file);
        return myNotes;
    }

    public void marshallMyNotesAndWriteToFile(MyNotes notes, URI uri) throws Exception {
        JAXBContext jaxbContext = JAXBContext.newInstance(MyNotes.class);
        Marshaller jaxbMarshaller = jaxbContext.createMarshaller();
        jaxbMarshaller.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, true);
        jaxbMarshaller.marshal(notes, new File(uri));
        jaxbMarshaller.marshal(notes, System.out);
    }

我期待着 grab 这 xml 通过网络;首先需要 match 结构到例子 .

1 回复 | 直到 6 年前

martidis 6 年前

你很亲近。您需要更改在myNotes类中为myNotes命名xmlElement的方式。另外,mynote本身不应该有note字段(根据所需的XML)。您编辑的类如下所示(为了方便起见,我还删除了日志语句):

@XmlType(propOrder = { "to", "from", "heading", "body"})
@XmlRootElement(name = "note")
public class MyNote {

    private String to;
    private String from;
    private String heading;
    private String body;

    public String getTo() {
        return to;
    }

    @XmlElement(name = "to")
    public void setTo(String to) {
        this.to = to;
    }

    public String getFrom() {
        return from;
    }

    @XmlElement(name = "from")
    public void setFrom(String from) {
        this.from = from;
    }

    public String getHeading() {
        return heading;
    }

    @XmlElement(name = "heading")
    public void setHeading(String heading) {
        this.heading = heading;
    }

    public String getBody() {
        return body;
    }

    @XmlElement(name = "body")
    public void setBody(String body) {
        this.body = body;
    }

    @Override
    public String toString() {
        return  to + from + heading + body;
    }

}

MyNotes:

@XmlRootElement(name = "MyNotes")
public class MyNotes {

    private List<MyNote> myNotes = new ArrayList<>();

    public MyNotes() {
    }

    public List<MyNote> getMyNotes() {
        return myNotes;
    }

    @XmlElement(name = "note")
    public void setMyNotes(List<MyNote> myNotes) {
        this.myNotes = myNotes;
    }

    public void add(MyNote myNote) {
        myNotes.add(myNote);
    }

    @Override
    public String toString() {
        StringBuffer str = new StringBuffer();
        for (MyNote note : this.myNotes) {
            str.append(note.toString());
        }
        return str.toString();
    }

}