XSD 转 Java，指定使用 Java HashMap
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XSD to Java, specify to use a Java HashMap
提问by hiveship
I am trying to generate some Java class from XSD schema. I know exactly what I want to generate in Java, and I'm trying to write the corresponding XSD schema.
我正在尝试从 XSD 模式生成一些 Java 类。我确切地知道我想在 Java 中生成什么，并且我正在尝试编写相应的 XSD 模式。
I need to represent a java.util.HashMap (HashMap). I can't find how to specify in the XSD schema (or xjb binding file) that I want an HasMap in Java. It always generate a List..
我需要表示一个 java.util.HashMap (HashMap)。我找不到如何在 XSD 模式（或 xjb 绑定文件）中指定我想要 Java 中的 HasMap。它总是生成一个列表..
here the code I want to generate
这里是我想生成的代码
@XmlAccessorType(XmlAccessType.FIELD)
@XmlType(name = "ErrorMessage", propOrder = { "name", "details"})
public class ErrorMessage {
@XmlElement(required = true)
protected String name;
@XmlElement(required = false)
protected java.util.Map<String, String> details = new HashMap<String, String>();
I have tried this:
我试过这个：
<xsd:complexType name="ErrorMessage">
<xsd:sequence>
<xsd:element name="name" type="xsd:string" />
<xsd:element name="details" type="map" />
</xsd:sequence>
</xsd:complexType>
<xsd:complexType name="map">
<xsd:sequence>
<xsd:element name="mapEntry" type="mapEntry" minOccurs="0" maxOccurs="unbounded" />
</xsd:sequence>
</xsd:complexType>
<xsd:complexType name="mapEntry">
<xsd:sequence>
<xsd:element name="key" type="xsd:string" />
<xsd:element name="value" type="xsd:string" />
</xsd:sequence>
</xsd:complexType>
But it still continue to generate a java.util.List of mapEntry:
但是它还是继续生成mapEntry的java.util.List：
In my "Error" class: protected Map details = new Map();
在我的“错误”类中：protected Map details = new Map();
Instead of
代替
protected java.util.Map<String, String> details = new HashMap<String, String>();
And the generated "map" class is :
生成的“地图”类是：
@XmlAccessorType(XmlAccessType.FIELD)
@XmlType(name = "map", propOrder = {"mapEntry"})
public class Map {
protected List<MapEntry> mapEntry;
I really need to use a map for my application. Any idea about how I can do ?
我真的需要为我的应用程序使用地图。知道我该怎么做吗？
Note: I have also tried to use Oracle owi:hasmpbut got a namespace error.
注意：我也尝试过使用Oracle owi:hasmp，但出现命名空间错误。
xmlns:owi="http://www.oracle.com/webservices/internal" (also tried with xmlns:owi="http://www.oracle.com/webservices/internal/literal")
included in my schema declaration
包含在我的架构声明中
and my "details" element declared as below
和我的“详细信息”元素声明如下
<xsd:element name="details" type="owi:hashmap" />
The error is:
错误是：
src-resolve.4.2: Error resolving component 'owi:hasmap'. It was detected that 'owi:hasmap' is in namespace
'http://www.oracle.com/webservices/internal', but components from this namespace are not referenceable from schema document 'file://myFile.xsd. If this is the incorrect namespace, perhaps the prefix of 'owi:hasmap' needs to be changed. If this is the correct namespace, then an appropriate 'import' tag should be added to 'file://myFile.xsd
src-resolve.4.2：解析组件“owi:hasmap”时出错。检测到“owi:hasmap”位于命名空间
“ http://www.oracle.com/webservices/internal”中，但无法从架构文档“file://myFile.xsd”中引用来自该命名空间的组件。如果这是不正确的命名空间，则可能需要更改 'owi:hasmap' 的前缀。如果这是正确的命名空间，则应将适当的“import”标记添加到“file://myFile.xsd”
And it can not associate "owi:hasmap" to any type definition component.
并且它不能将“owi:hasmap”关联到任何类型定义组件。
Any idea ?
任何的想法 ？
采纳答案by Zielu
Yes, maps are handled seamlessly by jaxb, but only in one way.
是的，地图由 jaxb 无缝处理，但只有一种方式。
The solution is described here:
此处描述了解决方案：
http://todayguesswhat.blogspot.co.uk/2012/09/jaxb-xsd-to-java-maphashmap-example.html
http://todayguesswhat.blogspot.co.uk/2012/09/jaxb-xsd-to-java-maphashmap-example.html
But it is a lot of hassle if you already have a class that maps correctly. Why do you want to regenerate it from XSD?
但是如果你已经有一个正确映射的类，那就很麻烦了。为什么要从 XSD 重新生成它？
