Inheritance 用JAXB解组继承结构_Inheritance_Jaxb_Unmarshalling

Inheritance 用JAXB解组继承结构

inheritance jaxb

Inheritance 用JAXB解组继承结构,inheritance,jaxb,unmarshalling,Inheritance,Jaxb,Unmarshalling,我想使用JAXB解组以下XML结构： <orCondition> <andCondition> <andCondition> <simpleCondition value="val1" /> <simpleCondition value="val2" /> </andCondition> <simpleCondition value="val3

我想使用JAXB解组以下XML结构：

<orCondition>
    <andCondition>
      <andCondition>
        <simpleCondition value="val1" />
        <simpleCondition value="val2" />
      </andCondition>
      <simpleCondition value="val3" />
    </andCondition>
    <simpleCondition value="val4" />
</orCondition>

包含两个条件的复合类

@XmlType(name="composite")
public class Composite extends Condition {

    @XmlElement(name = "condition", type = Condition.class)
    private Condition firstCondition;

    @XmlElement(name = "condition", type = Condition.class)
    private Condition secondCondition;

    public Condition getFirstCondition() {
        return firstCondition;
    }

    public void setFirstCondition(Condition firstCondition) {
        this.firstCondition = firstCondition;
    }

    public Condition getSecondCondition() {
        return secondCondition;
    }

    public void setSecondCondition(Condition secondCondition) {
        this.secondCondition = secondCondition;
    }
}

和条件

@XmlType(name = "andCondition")
public class And extends Composite {

}

@XmlType(name = "orCondition")
public class Or extends Composite {

}

@XmlType(name = "simpleCondition")
public class Simple extends Condition {

    @XmlAttribute
    String value;
}

或条件

@XmlType(name = "andCondition")
public class And extends Composite {

}

@XmlType(name = "orCondition")
public class Or extends Composite {

}

@XmlType(name = "simpleCondition")
public class Simple extends Condition {

    @XmlAttribute
    String value;
}

简单叶类条件

@XmlType(name = "andCondition")
public class And extends Composite {

}

@XmlType(name = "orCondition")
public class Or extends Composite {

}

@XmlType(name = "simpleCondition")
public class Simple extends Condition {

    @XmlAttribute
    String value;
}

这是行不通的。我在另一个类中有一个实例变量，如下所示：

@XmlElement(name = "condition", type = Condition.class) 
private Condition condition;

它在解组后保持为空。对象的其余部分将很好

奇怪的建议？或者这是不可能的？

您可以像这样构建您的模型：

综合

package forum9006785;

import javax.xml.bind.annotation.*;

@XmlRootElement(name = "simpleCondition")
public class Simple extends Condition {

    @XmlAttribute
    String value;

}

您可以将

复合

类更改为如下所示，并使用

@xmlementref

注释

@xmlementref

对应于替换组的XML模式概念：

package forum9006785;

import javax.xml.bind.annotation.*;

@XmlAccessorType(XmlAccessType.FIELD)
public class Composite extends Condition {

    @XmlElementRef
    private Condition[] condition = new Condition[2];

    public Condition getFirstCondition() {
        return condition[0];
    }

    public void setFirstCondition(Condition firstCondition) {
        condition[0] = firstCondition;
    }

    public Condition getSecondCondition() {
        return condition[1];
    }

    public void setSecondCondition(Condition secondCondition) {
        condition[1] = secondCondition;
    }

}

条件

package forum9006785;

public class Condition {

}

和

对于XML中可能出现的每个子类，都需要使用

@XmlRootElement

进行注释。它充当

@xmlementref

属性的类型标识符

package forum9006785;

import javax.xml.bind.annotation.XmlRootElement;

@XmlRootElement(name = "andCondition")
public class And extends Composite {

}

或

package forum9006785;

import javax.xml.bind.annotation.XmlRootElement;

@XmlRootElement(name = "orCondition")
public class Or extends Composite {

}

简单

package forum9006785;

import javax.xml.bind.annotation.*;

@XmlRootElement(name = "simpleCondition")
public class Simple extends Condition {

    @XmlAttribute
    String value;

}

演示

package forum9006785;

import java.io.File;
import javax.xml.bind.*;

public class Demo {

    public static void main(String[] args) throws Exception {
        JAXBContext jc = JAXBContext.newInstance(And.class, Or.class, Simple.class);

        File xml = new File("src/forum9006785/input.xml");
        Unmarshaller unmarshaller = jc.createUnmarshaller();
        Condition condition = (Condition) unmarshaller.unmarshal(xml);

        Marshaller marshaller = jc.createMarshaller();
        marshaller.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, true);
        marshaller.marshal(condition, System.out);
    }

}

输入/输出

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<orCondition>
    <andCondition>
        <andCondition>
            <simpleCondition value="val1"/>
            <simpleCondition value="val2"/>
        </andCondition>
        <simpleCondition value="val3"/>
    </andCondition>
    <simpleCondition value="val4"/>
</orCondition>




您可以按照以下方式构建您的模型：
综合
package forum9006785;

import javax.xml.bind.annotation.*;

@XmlRootElement(name = "simpleCondition")
public class Simple extends Condition {

    @XmlAttribute
    String value;

}

您可以将复合
类更改为如下所示，并使用@xmlementref
注释@xmlementref
对应于替换组的XML模式概念：
package forum9006785;

import javax.xml.bind.annotation.*;

@XmlAccessorType(XmlAccessType.FIELD)
public class Composite extends Condition {

    @XmlElementRef
    private Condition[] condition = new Condition[2];

    public Condition getFirstCondition() {
        return condition[0];
    }

    public void setFirstCondition(Condition firstCondition) {
        condition[0] = firstCondition;
    }

    public Condition getSecondCondition() {
        return condition[1];
    }

    public void setSecondCondition(Condition secondCondition) {
        condition[1] = secondCondition;
    }

}

条件
package forum9006785;

public class Condition {

}

和
对于XML中可能出现的每个子类，都需要使用@XmlRootElement
进行注释。它充当@xmlementref
属性的类型标识符
package forum9006785;

import javax.xml.bind.annotation.XmlRootElement;

@XmlRootElement(name = "andCondition")
public class And extends Composite {

}

或
package forum9006785;

import javax.xml.bind.annotation.XmlRootElement;

@XmlRootElement(name = "orCondition")
public class Or extends Composite {

}

简单
package forum9006785;

import javax.xml.bind.annotation.*;

@XmlRootElement(name = "simpleCondition")
public class Simple extends Condition {

    @XmlAttribute
    String value;

}

演示
package forum9006785;

import java.io.File;
import javax.xml.bind.*;

public class Demo {

    public static void main(String[] args) throws Exception {
        JAXBContext jc = JAXBContext.newInstance(And.class, Or.class, Simple.class);

        File xml = new File("src/forum9006785/input.xml");
        Unmarshaller unmarshaller = jc.createUnmarshaller();
        Condition condition = (Condition) unmarshaller.unmarshal(xml);

        Marshaller marshaller = jc.createMarshaller();
        marshaller.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, true);
        marshaller.marshal(condition, System.out);
    }

}

输入/输出
<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<orCondition>
    <andCondition>
        <andCondition>
            <simpleCondition value="val1"/>
            <simpleCondition value="val2"/>
        </andCondition>
        <simpleCondition value="val3"/>
    </andCondition>
    <simpleCondition value="val4"/>
</orCondition>




什么是“不起作用”呢？对不起。我在另一个类中有一个实例变量如下：@xmlement（name=“condition”，type=condition.class）private condition；它在解组后保持为空。对象的其余部分很好。“不工作”是什么意思？对不起。我在另一个类中有一个实例变量如下：@xmlement（name=“condition”，type=condition.class）private condition；它在解组后保持为空。对象的其余部分将很好。