JAXB移除xsi和xmlns，继承关系，自定义头部

最新推荐文章于 2025-07-10 12:43:55 发布

zeihao987

最新推荐文章于 2025-07-10 12:43:55 发布

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分类专栏： java 文章标签： java JAXB

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本文介绍如何使用Java进行XML序列化，包括取消xsi和xmlns、使用继承和自定义头部等技巧。通过具体代码示例展示了如何配置类和属性来生成符合需求的XML文档。

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1、取消xsi和xmlns

在变量标注@XmlElementRef即可

（1）添加前

<a>
    <p xsi:type="student" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
        <name>hs</name>
        <age>11</age>
    </p>
</a>

（2）添加后

<a>
    <p>
        <name>hs</name>
        <age>11</age>
    </p>
</a>

2、继承

在基类上标注@XmlSeeAlso({Student.class, Teacher.class})，并指明子类即可

3、自定义头部

在输出时，自己把头部写进去，这样他会引用你自己写的head（前提设置Marshaller.JAXB_FRAGMENT为true）。

详情见下面代码：

import javax.xml.bind.annotation.XmlAccessType;
import javax.xml.bind.annotation.XmlAccessorType;
import javax.xml.bind.annotation.XmlElementRef;
import javax.xml.bind.annotation.XmlRootElement;

@XmlRootElement
@XmlAccessorType(XmlAccessType.FIELD)
public class A {

    @XmlElementRef
    private People p;

    public People getP() {
        return p;
    }

    public void setP(People p) {
        this.p = p;
    }
}

import javax.xml.bind.annotation.XmlSeeAlso;

@XmlSeeAlso({Student.class, Teacher.class})
public class People {
}

import jdk.nashorn.internal.objects.annotations.Getter;
import jdk.nashorn.internal.objects.annotations.Setter;

import javax.xml.bind.annotation.XmlAccessType;
import javax.xml.bind.annotation.XmlAccessorType;
import javax.xml.bind.annotation.XmlElement;
import javax.xml.bind.annotation.XmlRootElement;


@XmlRootElement
@XmlAccessorType(XmlAccessType.FIELD)
public class Student extends People {
    @XmlElement(name = "name")
    private String name;

    @XmlElement(name = "age")
    private int age;

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public int getAge() {
        return age;
    }

    public void setAge(int age) {
        this.age = age;
    }
}

import javax.xml.bind.annotation.XmlAccessType;
import javax.xml.bind.annotation.XmlAccessorType;
import javax.xml.bind.annotation.XmlElement;
import javax.xml.bind.annotation.XmlRootElement;

@XmlRootElement
@XmlAccessorType(XmlAccessType.FIELD)
public class Teacher extends  People{
    @XmlElement
    private String dada;

    public String getDada() {
        return dada;
    }

    public void setDada(String dada) {
        this.dada = dada;
    }
}

import javax.xml.bind.JAXBContext;
import javax.xml.bind.JAXBException;
import javax.xml.bind.Marshaller;
import java.io.StringWriter;

public class Test {
    public static void main(String[] args) throws JAXBException {
        A a = new A();
        Student s = new Student();
        s.setAge(11);
        s.setName("hs");
        a.setP(s);
        JAXBContext context = JAXBContext.newInstance(A.class);
        Marshaller marshaller = context.createMarshaller();
        marshaller.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, true);
        marshaller.setProperty(Marshaller.JAXB_ENCODING, "utf-8");
        marshaller.setProperty(Marshaller.JAXB_FRAGMENT, true);
        StringWriter writer = new StringWriter();
        writer.write("<?xml version=\"1.0\" encoding=\"UTF-8\" ?>\n");
        marshaller.marshal(a, writer);
        System.out.println(writer.toString());
    }
}