JAXB XJC代码生成元素初始化器及其声明 [英] JAXB XJC code generation of element initializers with their declaration

问题描述

如果我有以下架构：

<xs:element name="Book">
    <xs:complexType>
        <xs:sequence>
            <xs:element ref="Chapter" />
        </xs:sequence>
    </xs:complexType>
</xs:element>
<xs:element name="Chapter">
    <xs:complexType>
        <xs:sequence>
            <xs:element maxOccurs="unbounded" name="Word" />
        </xs:sequence>
    </xs:complexType>
</xs:element>
<xs:element name="Word">
</xs:element>

它会生成如下内容：

@XmlRootElement(name = "Book")
public class Book {

    @XmlElement(name = "Chapter", required = true)
    protected Chapter chapter;

是否可以生成以下内容？

Is it possible to generate the following instead?

@XmlElement(name = "Chapter", required = true)
protected Chapter chapter = new Chapter();

即使XML文件缺少Book中的Chapter元素，它也是如此unmarshalled仍然会创建一个Book对象，因此可以执行
book.getChapter（）。getWord（）并检索一个空列表，而不是检查null。

This is so that even if an XML file is missing a Chapter element within a Book, when it is unmarshalled there will still be a Book object created so it is possible to do book.getChapter().getWord() and retrieve an empty list, instead of checking for null.

推荐答案

您可以创建一个插件。我写过简短教程你这样做。希望你觉得它有用。

You can create a plugin. I've written a short tutorial that helps you do exactly that. Hope you find it helpful.

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