Java JAXB 生成的 xml 中的“xsi:type”和“xmlns:xsi”

"xsi:type" and "xmlns:xsi" in generated xml by JAXB

提问by psmagin

I use JAXB to create folder and files hierarchy

我使用 JAXB 创建文件夹和文件层次结构

My model:

我的型号：

@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;
   }
}

I want to make tree of dirs and files:

我想制作目录和文件树：

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);
/.../
}

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

但我在生成的 xml 中有奇怪的“xsi:type”和“xmlns:xsi”：

<?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">
            /.../ 

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

所以我的问题是：这是什么意思以及如何删除它？

采纳答案by bdoughan

In your Dirclass you are not specifying the type of your collection this is why JAXB is adding the xsi:typeattributes.

在您的Dir类中，您没有指定集合的​​类型，这就是 JAXB 添加xsi:type属性的原因。

You have:

你有：

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

If your ArrayListis going to contain instances of Dirthen you can do:

如果您ArrayList要包含实例，Dir那么您可以执行以下操作：

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

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

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

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