jaxb：我使用不同的方法，但一切都不起作用

Question

我想输出这样的XML：

<master>
   <list type="array" nil="true">
<master>

我已经尝试了@XmlAttribute和@XmlElement(nil=true)，应该如何使用jaxb执行此操作。

<slave-status><connect-retry type="integer" nil="true"/>  
    <created_at type="datetime" nil="true"/>
<slave-status>

Answer 1

Master.java

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

@XmlRootElement
@XmlAccessorType(XmlAccessType.FIELD)
@XmlType(name = "master", propOrder = {
    "list"
})
public class Master {
    @XmlElement(name = "list")
    protected List list;

    public List getList() {
        return list;
    }

    public void setList(List value) {
        this.list = value;
    }
}

列表.java

import javax.xml.bind.annotation.XmlAccessType;
import javax.xml.bind.annotation.XmlAccessorType;
import javax.xml.bind.annotation.XmlAttribute;
import javax.xml.bind.annotation.XmlType;

@XmlAccessorType(XmlAccessType.FIELD)
@XmlType(name = "list")
public class List {
    @XmlAttribute(name = "type")
    protected String type;
    @XmlAttribute(name = "nil")
    protected boolean nil;
    public boolean isNil() {
        return nil;
    }
    public void setNil(boolean nil) {
        this.nil = nil;
    }
    public String getType() {
        return type;
    }
    public void setType(String value) {
        this.type = value;
    }
}

包装信息.java

@javax.xml.bind.annotation.XmlSchema(namespace = "", elementFormDefault = javax.xml.bind.annotation.XmlNsForm.QUALIFIED)
package com.ca.exporter.util;

主.java

import javax.xml.bind.JAXBContext;
import javax.xml.bind.JAXBException;
import javax.xml.bind.Marshaller;
public class Main {
    public static void main(String[] args) throws JAXBException {
        JAXBContext jc =  JAXBContext.newInstance(Master.class);
        Master m = new Master();
        List l = new List();
        l.setType("array");
        l.setNil(true);
        m.setList(l);
        Marshaller mar = jc.createMarshaller();
        mar.marshal(m, System.out);

    }
}

输出 - XML

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<master>
    <list type="array" nil="true"/>
</master>