使用 JAXB 从 XMLSchema.xsd 生成 Java 类 [英] Generating Java classes out of XMLSchema.xsd using JAXB

问题描述

我正在使用 jaxb 从 xml 模式中生成 java 类.架构导入 XMLSchema.xsd，其内容用作文档中的元素.

I'm using jaxb to generate java classes out of a xml schema. The schema imports XMLSchema.xsd and its content is used as an element in the document.

如果我分别删除导入和对xsd:schema"的引用，则绑定编译器会成功生成类.如果我不这样做，它将产生以下错误，如果我尝试仅从 XMLSchema.xsd 生成 Java 类，这些错误是相同的！

If I remove the import and the reference to "xsd:schema" respectively then the binding compiler generates successfully the classes. If I do not then it would produce the following errors, which are the same if I would try to generate Java classes from the XMLSchema.xsd only!

>  C:\Users\me>"%JAXB%/xjc" -extension -d tmp/uisocketdesc -p uis.jaxb uisocketdesc.xsd -b xml_binding_test.xml -b xml_binding_test_2.xml
-b xml_binding_test_3.xml
parsing a schema...
compiling a schema...

> [ERROR] A class/interface with the same name "uis.jaxb.ComplexType" is already in use. Use a class customization to resolve this conflict.
 line 612 of "http://www.w3.org/2001/XMLSchema.xsd"

> [ERROR] (Relevant to above error) another "ComplexType" is generated from here.
 line 440 of "http://www.w3.org/2001/XMLSchema.xsd"

> [ERROR] A class/interface with the same name "uis.jaxb.Attribute" is already in use. Use a class customization to resolve this conflict.
 line 364 of "http://www.w3.org/2001/XMLSchema.xsd"

> [ERROR] (Relevant to above error) another "Attribute" is generated from here.
 line 1020 of "http://www.w3.org/2001/XMLSchema.xsd"

> [ERROR] A class/interface with the same name "uis.jaxb.SimpleType" is already in use. Use a class customization to resolve this conflict.
 line 2278 of "http://www.w3.org/2001/XMLSchema.xsd"

> [ERROR] (Relevant to above error) another "SimpleType" is generated from here.
 line 2222 of "http://www.w3.org/2001/XMLSchema.xsd"

> [ERROR] A class/interface with the same name "uis.jaxb.Group" is already in use. Use a class customization to resolve this conflict.
 line 930 of "http://www.w3.org/2001/XMLSchema.xsd"

> [ERROR] (Relevant to above error) another "Group" is generated from here.
 line 727 of "http://www.w3.org/2001/XMLSchema.xsd"

> [ERROR] A class/interface with the same name "uis.jaxb.AttributeGroup" is already in use. Use a class customization to resolve this conflict.
 line 1062 of "http://www.w3.org/2001/XMLSchema.xsd"

> [ERROR] (Relevant to above error) another "AttributeGroup" is generated from here.
 line 1026 of "http://www.w3.org/2001/XMLSchema.xsd"

> [ERROR] A class/interface with the same name "uis.jaxb.Element" is already in use. Use a class customization to resolve this conflict.
 line 721 of "http://www.w3.org/2001/XMLSchema.xsd"

> [ERROR] (Relevant to above error) another "Element" is generated from here.
 line 647 of "http://www.w3.org/2001/XMLSchema.xsd"

> [ERROR] Two declarations cause a collision in the ObjectFactory class.
 line 1020 of "http://www.w3.org/2001/XMLSchema.xsd"

> [ERROR] (Related to above error) This is the other declaration.
 line 364 of "http://www.w3.org/2001/XMLSchema.xsd"

> [ERROR] Two declarations cause a collision in the ObjectFactory class.
 line 2278 of "http://www.w3.org/2001/XMLSchema.xsd"

> [ERROR] (Related to above error) This is the other declaration.
 line 2222 of "http://www.w3.org/2001/XMLSchema.xsd"

> [ERROR] Two declarations cause a collision in the ObjectFactory class.
 line 930 of "http://www.w3.org/2001/XMLSchema.xsd"

> [ERROR] (Related to above error) This is the other declaration.
 line 727 of "http://www.w3.org/2001/XMLSchema.xsd"

> [ERROR] Two declarations cause a collision in the ObjectFactory class.
 line 440 of "http://www.w3.org/2001/XMLSchema.xsd"

> [ERROR] (Related to above error) This is the other declaration.
 line 612 of "http://www.w3.org/2001/XMLSchema.xsd"

> [ERROR] Two declarations cause a collision in the ObjectFactory class.
 line 1026 of "http://www.w3.org/2001/XMLSchema.xsd"

> [ERROR] (Related to above error) This is the other declaration.
 line 1062 of "http://www.w3.org/2001/XMLSchema.xsd"

> [ERROR] Two declarations cause a collision in the ObjectFactory class.
 line 647 of "http://www.w3.org/2001/XMLSchema.xsd"

> [ERROR] (Related to above error) This is the other declaration.
 line 721 of "http://www.w3.org/2001/XMLSchema.xsd"

Failed to produce code.

推荐答案

也解决了这些问题，对我来说是大小写敏感问题以及元素和属性问题的同名问题(有时通过继承).对于第二个问题，我使用包含以下内容的外部绑定文件:

Fighting such stuff as well, for me it is case-sensitivity issue and the same name for element and attribute issue (thru inheritance sometimes). For the second problem I'm using external binding file that contains something like this:

<jaxb:bindings node="//xs:complexType[@name='AbstractGriddedSurfaceType']//xs:attribute[@name='rows']">
    <jaxb:property name="rowCount"/>
</jaxb:bindings>

对于区分大小写的问题，您可以使用 xjc 参数 -XautoNameResolution，maven 版本是 -B-XautoNameResolution</arg></args>，但这不适用于包装器元素，因此对于这些您需要编写如上所述的 jaxb 自定义，...如果您像我一样不幸 :) 您可能需要使用xsd 并手动修复重复项.

For case-sensitivity issues you can use xjc argument -XautoNameResolution, maven version is <args><arg>-B-XautoNameResolution</arg></args>, but this doesn't work for wrapper elements, so for these you need to write jaxb customizations as mentioned above, ... and if you are unlucky like me :) you may need to use a local copy of an xsd and fix duplications manually.

编辑找到了另一个解决大小写敏感问题的解决方案，其中重命名元素是不够的:

Edit Found another solution for the case-sensitivity issue where renaming the element isn't enough:

<jaxb:bindings node=".//xs:element[@name='imageDatum'][@type='gml:ImageDatumPropertyType']">
    <jaxb:property name="imageDatumInst"/>
    <jaxb:factoryMethod name="imageDatumInst" />
</jaxb:bindings>

祝你好运，希望这会有所帮助.

Good luck, hope this helps.

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