如何编写我的XSD以便使用JAXB和XJC匹配所需的XML和Java格式

问题描述

我希望能够使用JAXB处理这种格式的XML ...

I would like to be able to process XML of this format using JAXB ...

<configuration>
  <!-- more content here -->
  <things>
    <thing>
      <name>xx1</name>
      <value>yy1</value>
    </thing>
    <thing>
      <name>xx2</name>
      <value>yy2</value>
    </thing>
  </things>
  <!-- more content here -->
</configuration>

我想把上面的XML编组到这些Java类中（为简单起见，我留下了修饰符等as public ， protected 以及getter / setters away）：

I'd like to marshal the above XML into these Java classes (for simplicity, I left modifiers such as public, protected as well as getters/setters away):

class Configuration {
  List<Thing> things;
}

class Thing {
  String name;
  String value;
}

我当前XSD结构的相关部分大致如下：

The relevant part of my current XSD structure roughly looks like this:

<complexType name="Configuration">
  <sequence>
    <!-- ... -->
    <element name="things" type="ns:Things" minOccurs="0" maxOccurs="unbounded"/>
    <!-- ... -->
  </sequence>
</complexType>

<complexType name="Things">
  <sequence>
    <element name="thing" type="ns:Thing" minOccurs="0" maxOccurs="unbounded"/>
  </sequence>
</complexType>

不幸的是，XJC还为生成类即使在处理的Java部分中确实没有必要。所以我的输出是：

Unfortunately, XJC generates also a class for Things even if that is really unnecessary in the Java part of the processing. So my output is this:

class Configuration {
  Things things;
}

class Things {
  List<Thing> thing;
}

class Thing {
  String name;
  String value;
}

我有什么方法可以告诉XJC避免产生这种不必要的类？或者有什么方法可以重新说出我的XSD以避免这一代？这两个选项都适合我。

Is there any way I can tell XJC to avoid generating this unnecessary class? Or is there any way I can re-phrase my XSD in order to avoid that generation? Both options would be fine with me.

事实上，我想我需要生成 @XmlElementWrapper 注释如下所示：

In fact, I guess I would need to generate the @XmlElementWrapper annotation as documented here:

• Mapping Java collections which contains super- and sub-types with JAXB
• JAXB List Tag creating inner class

推荐答案

此问题中记录了一个可能的解决方案：

A possible solution is documented in this question here:

这允许生成以下Java代码，正是我所需要的（无关的注释省略）：

This XJC plugin allows for generating the following Java code, doing precisely what I needed (irrelevant annotations omitted):

class Configuration {

  @XmlElementWrapper(name = "things")
  @XmlElement(name = "thing")
  List<Thing> things;
}

class Thing {
  String name;
  String value;
}

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