java - 解码到内部静态类字段

Question

我有一个带有复合键的实体类，它是实体的公共(public)静态内部类。我想解码一个文件并将值放入内部类的字段中。

我用@XmlKey、@XmlPath、@XmlJoinNode尝试了一些方法，但没有任何效果，我什至不确定我是否走在正确的道路上。

我的 xml 文件:

<?xml version="1.0" encoding="UTF-8"?>

<numbers>
    <one>one_text</one>
    <two>two_text</two>
    <three>three_text</three>
    <four>four_text</four>
</numbers>

我的类(class):

@XmlRootElement(name = "numbers")
public class Numbers {

    public static class Id {

        @XmlElement
        private String one;

        @XmlElement
        private String two;

        public String getOne() {
            return one;
        }

        public void setOne(String one) {
            this.one = one;
        }

        public String getTwo() {
            return two;
        }

        public void setTwo(String two) {
            this.two = two;
        }
    }

    @XmlElement
    private String three;

    @XmlElement
    private String four;

    private Id id = new Id();

    public String getThree() {
        return three;
    }

    public void setThree(String three) {
        this.three = three;
    }

    public String getFour() {
        return four;
    }

    public void setFour(String four) {
        this.four = four;
    }

    public Id getId() {
        return id;
    }

    public void setId(Id id) {
        this.id = id;
    }    
}

不用担心缺少 JPA 注释。感谢您的回答。

更新

精度:XML 文件无法修改，如果没有办法保存这样的内容，则 java 类可能会修改，但它必须可以被 hibernate 解释为具有复合主键的实体。

使用 MOXy 的解决方案

import java.io.Serializable;

import javax.persistence.Column;
import javax.persistence.Embeddable;
import javax.persistence.EmbeddedId;
import javax.persistence.Entity;
import javax.xml.bind.annotation.XmlAccessType;
import javax.xml.bind.annotation.XmlAccessorType;
import javax.xml.bind.annotation.XmlElement;
import javax.xml.bind.annotation.XmlRootElement;

import org.eclipse.persistence.oxm.annotations.XmlPath;

@XmlRootElement(name = "numbers")
@XmlAccessorType(XmlAccessType.FIELD)
@Entity
public class Numbers {

    @Embeddable
    public static class Id implements Serializable {

        private static final long serialVersionUID = -2153062768685935342L;

        @Column
        @XmlElement
        private String one;

        @Column
        @XmlElement
        private String two;

        public String getOne() {
            return one;
        }

        public void setOne(String one) {
            this.one = one;
        }

        public String getTwo() {
            return two;
        }

        public void setTwo(String two) {
            this.two = two;
        }

        @Override
        public int hashCode() {
            final int prime = 31;
            int result = 1;
            result = prime * result + ((one == null) ? 0 : one.hashCode());
            result = prime * result + ((two == null) ? 0 : two.hashCode());
            return result;
        }

        @Override
        public boolean equals(Object obj) {
            if (this == obj)
                return true;
            if (obj == null)
                return false;
            if (getClass() != obj.getClass())
                return false;
            Id other = (Id) obj;
            if (one == null) {
                if (other.one != null)
                    return false;
            } else if (!one.equals(other.one))
                return false;
            if (two == null) {
                if (other.two != null)
                    return false;
            } else if (!two.equals(other.two))
                return false;
            return true;
        }
    }

    @Column
    @XmlElement
    private String three;

    @Column
    @XmlElement
    private String four;

    @EmbeddedId
    @XmlPath(".")
    private Id id = new Id();


    public String getThree() {
        return three;
    }

    public void setThree(String three) {
        this.three = three;
    }


    public String getFour() {
        return four;
    }

    public void setFour(String four) {
        this.four = four;
    }

    public Id getId() {
        return id;
    }

    public void setId(Id id) {
        this.id = id;
    }
}

MOXy 的替代品

import java.io.Serializable;

import javax.persistence.Column;
import javax.persistence.Embeddable;
import javax.persistence.EmbeddedId;
import javax.persistence.Entity;
import javax.xml.bind.annotation.XmlAccessType;
import javax.xml.bind.annotation.XmlAccessorType;
import javax.xml.bind.annotation.XmlElement;
import javax.xml.bind.annotation.XmlRootElement;
import javax.xml.bind.annotation.XmlTransient;

@XmlRootElement(name = "numbers")
@XmlAccessorType(XmlAccessType.FIELD)
@Entity
public class Numbers {

    @Embeddable
    public static class Id implements Serializable {

        private static final long serialVersionUID = -2153062768685935342L;

        @Column
        private String one;

        @Column
        private String two;

        public String getOne() {
            return one;
        }

        public void setOne(String one) {
            this.one = one;
        }

        public String getTwo() {
            return two;
        }

        public void setTwo(String two) {
            this.two = two;
        }

        @Override
        public int hashCode() {
            final int prime = 31;
            int result = 1;
            result = prime * result + ((one == null) ? 0 : one.hashCode());
            result = prime * result + ((two == null) ? 0 : two.hashCode());
            return result;
        }

        @Override
        public boolean equals(Object obj) {
            if (this == obj)
                return true;
            if (obj == null)
                return false;
            if (getClass() != obj.getClass())
                return false;
            Id other = (Id) obj;
            if (one == null) {
                if (other.one != null)
                    return false;
            } else if (!one.equals(other.one))
                return false;
            if (two == null) {
                if (other.two != null)
                    return false;
            } else if (!two.equals(other.two))
                return false;
            return true;
        }
    }

    @Column
    @XmlElement
    private String three;

    @Column
    @XmlElement
    private String four;

    @EmbeddedId
    @XmlTransient
    private Id id = new Id();


    public String getThree() {
        return three;
    }

    public void setThree(String three) {
        this.three = three;
    }


    public String getFour() {
        return four;
    }

    public void setFour(String four) {
        this.four = four;
    }

    public Id getId() {
        return id;
    }

    public void setId(Id id) {
        this.id = id;
    }

    @XmlElement
    public String getOne() {
        return id.getOne();
    }

    public void setOne(String one) {
        id.setOne(one);
    }

    @XmlElement
    public String getTwo() {
        return id.getTwo();
    }

    public void setTwo(String two) {
        id.setTwo(two);
    }
}

Answer 1

由于您的问题被标记为 [moxy]，您可以使用 MOXy 的 @XmlPath 扩展，如下所示以获得所需的行为。

@XmlPath(".")
private Id id = new Id();