"的xsi：type"和“xmlns：xsi”;在JAXB生成的xml中

问题描述

我使用JAXB创建文件夹和文件层次结构

I use JAXB to create folder and files hierarchy

我的模型：

@XmlRootElement
public class Root {

    @XmlAttribute
    private String path;

    @XmlElement(name = "dir")
    private ArrayList<Dir> rootContentDirs = null;

    @XmlElement(name = "file")
    private ArrayList<FileObj> rootContentFiles = null;


    public void setRootContentDirs(ArrayList<Dir> rootContentDirs) {
        this.rootContentDirs = rootContentDirs;
    }

    public void setRootContentFiles(ArrayList<FileObj> rootContentFiles) {
        this.rootContentFiles = rootContentFiles;
    }

    public void setPath(String path) {
        this.path = path;
    }
 }

public class Dir {

    @XmlAttribute
    private String name;

    @XmlElement(name = "dir")
    private ArrayList dirs = null;

    @XmlElement(name = "file")
    private ArrayList files = null;

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

    public void setDirs(ArrayList dirs) {
        this.dirs = dirs;
    }

    public void setFiles(ArrayList files) {
        this.files = files;
    }
 }

public class FileObj{

   @XmlAttribute
   private String name;
   @XmlAttribute
   private long size;
   @XmlAttribute
   private String type;


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

   public void setSize(long size) {
       this.size = size;
   }

   public void setType(String type) {
       this.type = type;
   }
}

我想制作dirs和文件树：

I want to make tree of dirs and files:

public class XmlByJaxb extends Generator {

private static final String JAXB_XML = "./jaxb.xml";
private static Root root = null;

@Override
public void output() throws IOException {
    JAXBContext context = null;
    Marshaller m = null;
    try {
        context = JAXBContext.newInstance(Root.class, Dir.class, FileObj.class);
        m = context.createMarshaller();
        m.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, Boolean.TRUE);
        m.marshal(root, new File(JAXB_XML));
    } catch (JAXBException e) {

    }
}

@Override
public void run() {
    ArrayList<FileObj> rootFiles = addFiles(dir);
    ArrayList<Dir> rootDirs = make(dir);

    root = new Root();
    root.setPath(dir.getPath());
    root.setRootContentFiles(rootFiles);
    root.setRootContentDirs(rootDirs);
/.../
}

但我很奇怪xsi：在生成的xml中键入和xmlns：xsi：

But I hava strange "xsi:type" and "xmlns:xsi" in generated xml:

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<root path="/home/phlamey/IdeaProjects/FileUtillite">
<dir name="src">
    <dir xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:type="dir" name="test">
        <dir xsi:type="dir" name="java">
            /.../ 

所以我的问题：这意味着什么以及如何删除这个？

So my question: what does this mean and how does remove this?

推荐答案

在你的 Dir 类中，你没有指定类型你的收藏这就是JAXB添加 xsi：type 属性的原因。

In your Dir class you are not specifying the type of your collection this is why JAXB is adding the xsi:type attributes.

你有：

@XmlElement(name = "dir")
private ArrayList dirs;

如果您的 ArrayList 将包含实例 Dir 然后你可以这样做：

If your ArrayList is going to contain instances of Dir then you can do:

@XmlElement(name = "dir")
private ArrayList<Dir> dirs = null;

如果由于某种原因您不想在集合上指定类型，那么您可以这样做在 @XmlElement 注释中：

If for some reason you don't want to specify the type on the collection then you can do it in the @XmlElement annotation:

@XmlElement(name = "dir", type=Dir.class)
private ArrayList dirs = null;

这篇关于"的xsi：type"和“xmlns：xsi”;在JAXB生成的xml中的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！