生成实现接口的JAXB类 [英] Generating a JAXB class that implements an interface
问题描述
我目前正在使用JAXB生成java类以解组XML。现在我想创建一个与第一个非常类似的新模式，并让生成的类实现相同的接口。
例如，我有两个模式文件定义具有类似标签的XML：
adult.xsd
<？xml version =1.0encoding =UTF-8？>
< xs：element name =Person>
< xs：complexType>
< xs：sequence>
< xs：element name =Nametype =xs：string/>
< xs：element name =Agetype =xs：integer/>
< xs：element name =Jobtype =xs：string/>
< / xs：sequence>
< / xs：complexType>
< / xs：element>
kid.xsd
<？xml version =1.0encoding =UTF-8？>
< xs：element name =Person>
< xs：complexType>
< xs：sequence>
< xs：element name =Nametype =xs：string/>
< xs：element name =Agetype =xs：integer/>
< xs：element name =Schooltype =xs：string/>
< / xs：sequence>
< / xs：complexType>
< / xs：element>
使用JAXB和XJC我想生成两个类文件：
public class Adult implements Person {
...
public String getName（）{...}
public int getAge（）{...}
public String getJob {...}
}
public class Kid实现Person {
...
public String getName（）{...}
public int getAge（）{...}
public String getSchool {...}
}
其中Person接口定义 getName（）和 getAge （）方法。
我看过一些文档用于映射接口，但这似乎只适用于已经有要映射到DOM的java类的情况。
另外，我试过用这个外部插件但它似乎不起作用。这是我的xjb绑定文件：
< jxb：bindings version =1.0
xmlns：jxb =http://java.sun.com/xml/ns/jaxb
xmlns：xs =http://www.w3.org/2001/XMLSchema
xmlns：xjc =http://java.sun.com/xml/ns/jaxb/xjc
xmlns：ext =http://xml.w-wins.com/xjc-plugins/interfaces
jxb：extensionBindingPrefixes =xjc>
< jxb：bindings schemaLocation =xsd / adult.xsdnode =xs：schema / xs：complexType [@ name ='Person']>
< ext：interface> mypackage.Hello< / ext：interface>
< / jxb：bindings>
< / jxb：bindings>
但这会产生以下错误：
$ java -cplib / activation.jar; lib / InterfacesXJCPlugin.jar; lib / jaxb1-impl.jar; lib / jaxb-api.jar; lib / jaxb-xjc.jar; lib / jsr173_1.0_api.jarcom.sun.tools.xjc.XJCFacade -p mypackage.myxml -extension -Xinterfaces xsd / adult.xsd -b binding.xjb
解析a schema ...
[错误] XPath评估xs：schema / xs：complexType [@ name ='Person']导致空目标节点
第8行文件：/ C：/ dev /jaxb/jaxb-ri/binding.xjb
无法解析模式。
是否可以使用实现接口的JAXB生成一个类？
更新
我尝试过使用 Interface Insertion 插件但由于某种原因无法使其工作。这就是我调用xjc的方式，但好像插件jar没有从类路径中获取：
$ java -cplib / xjc-if-ins.jar; lib / jaxb-xjc.jarcom.sun.tools.xjc.XJCFacade -p mypackage -extension -Xifins myschema.xsd -b binding.xjb
我收到错误：
< pre class =lang-none prettyprint-override>
无法识别的参数-Xifins
任何想法？
不幸的是，看起来在其他一些答案中提到的界面注入插件已不再适用-支持的。事实上，我很难找到下载的JAR。
谢天谢地， JAXB2 Basics插件提供了一种类似的机制，用于向生成的JAXB存根添加接口（参见继承插件）。
继承插件文档有一个示例，显示了XML模式文件的外观。但是，由于您无法修改架构，因此可以使用外部绑定文件：
< ;？xml version =1.0？>
< jxb：bindings version =1.0
xmlns：jxb =http://java.sun.com/xml/ns/jaxb
xmlns：xs =http： //www.w3.org/2001/XMLSchema
xmlns：xjc =http://java.sun.com/xml/ns/jaxb/xjc
xmlns：inheritance =http： //jaxb2-commons.dev.java.net/basic/inheritance
jxb：extensionBindingPrefixes =xjc>
< jxb：bindings schemaLocation =xsd / adult.xsd>
< jxb：bindings node =// xs：complexType [@ name ='Person']>
< inheritance：implements> mypackage.Hello< / inheritance：implements>
< / jxb：bindings>
< / jxb：bindings>
< / jxb：bindings>
JAXB2 Basics插件文档包含有关使用Ant和Maven插件的说明。您也可以直接从命令行使用它，但命令有点乱（由于您必须添加到类路径的jar数量）：
java -jar jaxb-xjc.jar
-classpath jaxb2-basics-0.5.3.jar，jaxb2-basics-runtime-0.5.3.jar ，
jaxb2-basics-tools-0.5.3.jar，commons-beanutils-0.5.3.jar，
commons-lang.jar，commons-logging.jar
-p mypackage。 myxml -extension -Xinheritance xsd / adult.xsd -b binding.xjb
JAXB2 Basics插件提供了您可能也觉得有用的其他实用程序的数量（例如equals，hashCode和toString方法的自动生成）。
I'm currently using JAXB to generate java classes in order to unmarshall XML. Now I would like to create a new schema very similar to the first and have the classes that are generated implement the same interface.
Say for example, I have two schema files which define XML with similar tags:
adult.xsd
<?xml version="1.0" encoding="UTF-8"?>
<xs:element name="Person">
<xs:complexType>
<xs:sequence>
<xs:element name="Name" type="xs:string" />
<xs:element name="Age" type="xs:integer" />
<xs:element name="Job" type="xs:string" />
</xs:sequence>
</xs:complexType>
</xs:element>
kid.xsd
<?xml version="1.0" encoding="UTF-8"?>
<xs:element name="Person">
<xs:complexType>
<xs:sequence>
<xs:element name="Name" type="xs:string" />
<xs:element name="Age" type="xs:integer" />
<xs:element name="School" type="xs:string" />
</xs:sequence>
</xs:complexType>
</xs:element>
Using JAXB and XJC I'd like to generate two class files:
public class Adult implements Person {
...
public String getName() { ... }
public int getAge() { ... }
public String getJob { ... }
}
public class Kid implements Person {
...
public String getName() { ... }
public int getAge() { ... }
public String getSchool { ... }
}
where the Person interface defines the getName() and getAge() methods.
I've looked at some of the documentation for mapping interfaces but this appears to only be for the situation when you already have java classes that you want to map to a DOM.
Also, I've tried to use this external plugin but it doesn't appear to work. Here is my xjb binding file:
<jxb:bindings version="1.0"
xmlns:jxb="http://java.sun.com/xml/ns/jaxb"
xmlns:xs="http://www.w3.org/2001/XMLSchema"
xmlns:xjc="http://java.sun.com/xml/ns/jaxb/xjc"
xmlns:ext="http://xml.w-wins.com/xjc-plugins/interfaces"
jxb:extensionBindingPrefixes="xjc">
<jxb:bindings schemaLocation="xsd/adult.xsd" node="xs:schema/xs:complexType[@name='Person']">
<ext:interface>mypackage.Hello</ext:interface>
</jxb:bindings>
</jxb:bindings>
but this gives the following error:
$ java -cp "lib/activation.jar;lib/InterfacesXJCPlugin.jar;lib/jaxb1-impl.jar;lib/jaxb-api.jar;lib/jaxb-xjc.jar;lib/jsr173_1.0_api.jar" com.sun.tools.xjc.XJCFacade -p mypackage.myxml -extension -Xinterfaces xsd/adult.xsd -b binding.xjb
parsing a schema...
[ERROR] XPath evaluation of "xs:schema/xs:complexType[@name='Person']" results in empty target node
line 8 of file:/C:/dev/jaxb/jaxb-ri/binding.xjb
Failed to parse a schema.
Is it possible to generate a class with JAXB that implements an interface?
Update
I've tried using the Interface Insertion plugin but for some reason can't get it to work. This is how I'm calling xjc yet it is as if the plugin jar is not getting picked up from the classpath:
$ java -cp "lib/xjc-if-ins.jar;lib/jaxb-xjc.jar" com.sun.tools.xjc.XJCFacade -p mypackage -extension -Xifins myschema.xsd -b binding.xjb
I get the error:
unrecognized parameter -Xifins
Any ideas?
Unfortunately, it looks like the interface-injection plugin mentioned in some of the other answers is no longer well-supported. In fact, I'm having trouble finding the JAR for download.
Thankfully, the JAXB2 Basics Plugins provides a similar mechanism for adding an interface to the generated JAXB stubs (see the Inheritance plugin).
The Inheritance plugin documentation has an example showing what the XML schema file might look like. However, since you cannot modify the schema, you can use an external bindings file instead:
<?xml version="1.0"?>
<jxb:bindings version="1.0"
xmlns:jxb="http://java.sun.com/xml/ns/jaxb"
xmlns:xs="http://www.w3.org/2001/XMLSchema"
xmlns:xjc="http://java.sun.com/xml/ns/jaxb/xjc"
xmlns:inheritance="http://jaxb2-commons.dev.java.net/basic/inheritance"
jxb:extensionBindingPrefixes="xjc">
<jxb:bindings schemaLocation="xsd/adult.xsd">
<jxb:bindings node="//xs:complexType[@name='Person']">
<inheritance:implements>mypackage.Hello</inheritance:implements>
</jxb:bindings>
</jxb:bindings>
</jxb:bindings>
The JAXB2 Basics Plugins documentation includes instructions for using the plugin with Ant and Maven. You can also use it straight from the command line, but the command is a bit messy (due to the number of jars you have to add to the classpath):
java -jar jaxb-xjc.jar
-classpath jaxb2-basics-0.5.3.jar,jaxb2-basics-runtime-0.5.3.jar,
jaxb2-basics-tools-0.5.3.jar,commons-beanutils-0.5.3.jar,
commons-lang.jar,commons-logging.jar
-p mypackage.myxml -extension -Xinheritance xsd/adult.xsd -b binding.xjb
The JAXB2 Basics Plugins provides a number of other utilities which you might also find useful (such as autogeneration of equals, hashCode, and toString methods).
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