JAXB XML输出格式问题 [英] JAXB XML output format questions

问题描述

我有以下结构的Java类（类名不暗示任何东西，我只是在制作它们）。

 包装测试; 
 
 import java.util.ArrayList; 
 import java.util.List; 
 
 import javax.xml.bind.JAXBContext; 
 import javax.xml.bind.JAXBException; 
 import javax.xml.bind.Marshaller; 
 import javax.xml.bind.annotation.XmlAccessType; 
 import javax.xml.bind.annotation.XmlAccessorType; 
 import javax.xml.bind.annotation.XmlAttribute; 
 import javax.xml.bind.annotation.XmlElement; 
 import javax.xml.bind.annotation.XmlElementWrapper; 
 import javax.xml.bind.annotation.XmlRootElement; 
 import javax.xml.bind.annotation.XmlValue; 
 
 @XmlRootElement 
公共类测试
 {
 @XmlAccessorType（XmlAccessType.FIELD）
静态类机器
 {
 @ XmlElementWrapper（name =servers）
 @XmlElement（name =server）
 List< Server> servers = new ArrayList< Server>（）; 
} 
 
 @XmlAccessorType（XmlAccessType.FIELD）
静态类服务器
 {
阈值t =新阈值（）; 
} 
 
 @XmlAccessorType（XmlAccessType.FIELD）
静态类阈值
 {
 RateThreshold load = new RateThreshold（）; 
} 
 
 @XmlAccessorType（XmlAccessType.FIELD）
静态类RateThreshold 
 {
 @XmlAccessorType（XmlAccessType.FIELD）
静态类费率
 {
 int count; 
期间=新的期间（）; 
} 
 
 @XmlAccessorType（XmlAccessType.FIELD）
私有静态类句点
 {
 @XmlAttribute 
 private String type =second ; 
 
 @XmlValue 
私人浮动期; 
} 
 
 Rate min = new Rate（）; 
 Rate max = new Rate（）; 
} 
 
 @XmlElementWrapper（name =machines）
 @XmlElement（name =machine）
 List< Machine> machines = new ArrayList< Machine>（）; 
 
 public static void main（String [] args）
 {
 Machine m = new Machine（）; 
 Server s = new Server（）; 
 s.t.load.max.count = 10; 
 s.t.load.min.count = 1; 
 m.servers.add（s）; 
 
测试t = new Test（）; 
 t.machines.add（m）; 
 
 JAXBContext jaxbContext; 
 Marshaller marshaller; 
 try 
 {
 jaxbContext = JAXBContext.newInstance（Test.class）; 
 marshaller = jaxbContext.createMarshaller（）; 
 marshaller.setProperty（Marshaller.JAXB_FORMATTED_OUTPUT，true）; 
 marshaller.marshal（t，System.out）; 
} 
 catch（JAXBException e）
 {
 e.printStackTrace（）; 
} 
} 
} 
  

我遇到的问题是在编组Test实例时使用JAXB生成的XML输出。 XML输出将始终如下所示：

 <？xml version =1.0encoding =UTF-8独立= 是 >？; 
< test> 
< machines> 
< machine> 
< servers> 
< server> 
< t> 
< load> 
< min> 
< count> 1< / count> 
< period type =second> 0.0< / period> 
< / min> 
< max> 
< count> 10< / count> 
< period type =second> 0.0< / period> 
< / max> 
< / load> 
< / t> 
< / server> 
< / servers> 
< / machine> 
< / machines> 
< / test> 
  

如您所见，某些元素没有正确缩进（即最深的元素，数量）和期间）。这是为什么？我创建JAXB上下文的方式有问题吗？或者JAXB递归缩进的元素数量是否有最大限制？我怎么能解决这个问题？请注意，我还将JAXB_FORMATTED_OUTPUT设置为true，但仍然得到不正确的缩进。

谢谢。

缩进发生模8，在

  com.sun.xml.bind.v2.runtime .output.IndentingUTF8XmlOutput 
  

你找到

  int i = depth％8; 
  

I have Java classes with the following structure (the class names do not imply anything, I was just making them up).

package test;

import java.util.ArrayList;
import java.util.List;

import javax.xml.bind.JAXBContext;
import javax.xml.bind.JAXBException;
import javax.xml.bind.Marshaller;
import javax.xml.bind.annotation.XmlAccessType;
import javax.xml.bind.annotation.XmlAccessorType;
import javax.xml.bind.annotation.XmlAttribute;
import javax.xml.bind.annotation.XmlElement;
import javax.xml.bind.annotation.XmlElementWrapper;
import javax.xml.bind.annotation.XmlRootElement;
import javax.xml.bind.annotation.XmlValue;

@XmlRootElement
public class Test
{
    @XmlAccessorType(XmlAccessType.FIELD)
    static class Machine
    {
        @XmlElementWrapper(name="servers")
        @XmlElement(name="server")
        List<Server> servers = new ArrayList<Server>();
    }

    @XmlAccessorType(XmlAccessType.FIELD)
    static class Server
    {
        Threshold t = new Threshold();
    }

    @XmlAccessorType(XmlAccessType.FIELD)
    static class Threshold
    {
        RateThreshold load = new RateThreshold();
    }

    @XmlAccessorType(XmlAccessType.FIELD)
    static class RateThreshold
    {
        @XmlAccessorType(XmlAccessType.FIELD)
        static class Rate
        {
            int count;
            Period period = new Period();
        }

        @XmlAccessorType(XmlAccessType.FIELD)
        private static class Period
        {
            @XmlAttribute
            private String type = "second";

            @XmlValue
            private float period;
        }

        Rate min = new Rate();
        Rate max = new Rate();
    }

    @XmlElementWrapper(name="machines")
    @XmlElement(name="machine")
    List<Machine> machines = new ArrayList<Machine>();

    public static void main(String[] args)
    {
        Machine m = new Machine();
        Server s = new Server();
        s.t.load.max.count = 10;
        s.t.load.min.count = 1;
        m.servers.add(s);

        Test t = new Test();
        t.machines.add(m);

        JAXBContext jaxbContext;
        Marshaller marshaller;
        try
        {
            jaxbContext = JAXBContext.newInstance(Test.class);
            marshaller = jaxbContext.createMarshaller();
            marshaller.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, true);
            marshaller.marshal(t, System.out);
        }
        catch (JAXBException e)
        {
            e.printStackTrace();
        }
    }
}

The problem I am having is with the XML output generated by JAXB when marshalling a Test instance. The XML output would always look like the following:

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<test>
    <machines>
        <machine>
            <servers>
                <server>
                    <t>
                        <load>
                            <min>
<count>1</count>
<period type="second">0.0</period>
                            </min>
                            <max>
<count>10</count>
<period type="second">0.0</period>
                            </max>
                        </load>
                    </t>
                </server>
            </servers>
        </machine>
    </machines>
</test>

As you can see, some elements are not being indented properly (that is, the deepest elements, count and period). Why is that? Is there something wrong with the way I created the JAXB context? Or is there a maximum limit to how many elements that can be indented recursively by JAXB? How could I fix this? Note that I have also set JAXB_FORMATTED_OUTPUT to true, but still get the improper indentation.

Thanks.

解决方案

Indenting occurs modulo 8, in

com.sun.xml.bind.v2.runtime.output.IndentingUTF8XmlOutput

you find

int i = depth%8;

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