java - 可序列化类中包含的对象类型枚举的序列化

Question

我正在尝试序列化在可序列化类中声明的对象类型枚举。我已经在这里红色了所有主题，但我没有找到我的问题的答案。我希望有人能在这里帮助我。 我实际上正在尝试序列化 2 个对象类型 SType 和 CbitSet，但我得到以下结果:

<rSIt>
  <sType>S_V_INC</sType>
  <bits/>
  <mHave>true</mHave>
</rSIt>

我期待类似的事情:

<rSIt>
  <sType>
     <code>VI</code>
     <description>V Inc</description>
     <name>S_V_INC</name>
  </sType>
  <bits>
    <words>{long[7]@5285}</words>
    <wordsInUse>7</wordsInUse>
    <sizeIsSticky>false</sizeIsSticky>
  <bits>
  <mHave>true</mHave>
</rSIt>

这是我的代码:

    @XmlRootElement(name="rSIt")
    @XmlAccessorType(XmlAccessType.FIELD)
    public class RSIt implements Serializable{
        private static final long serialVersionUID = -5848959699974019999L;
        @XmlElement
        private SType sType;
        @XmlElement
        private CbitSet bits = new CbitSet();
        @XmlElement
        private boolean mHave = true;

        public SType getSType() {
            return this.sType;
        }
        public void setSType(SType sType) {
            this.sType = sType;
        }
        public CbitSet getBits() {
            return this.bits;
        }

        public boolean ismHave() {
            return this.mHave;
        }
        public void setmHave(boolean mHave) {
            this.mHave = mHave;
        }

        public RSIt() {
            super();
        }

        public RSIt(SType sType, boolean mHave) {
            super();
            this.sType = sType;
            this.mHave = mHave;
        }

        public RSIt(SType sType, boolean mHave, Integer bit) {
            super();
            this.sType = sType;
            this.mHave = mHave;
            this.bits.set(bit);
        }
        }
    This is the implementation of SType  class (it is an Enum class):
    public enum SType {
        S_V_INC ("VI", "V Inc"),
        S_V_EXC ("VE", "V Exc"),
        S_RP_INC ("RI", "RP Inc"),
        S_RP_EXC ("RE", "RP Exc"),
        S_V_AN_F ("VA", "V F All");

        private final String code;
        private final String description;
        SearchType (String code, String description) {
            this.code = code;
            this.description = description;
        }
        public String getCode() {
            return code;
        }
        public String getDescription() {
            return description;
        }
    }
    This is the implementation of CbitSet class
    import java.util.BitSet;
    @XmlRootElement(name="rSIt")
    @XmlAccessorType(XmlAccessType.FIELD)
    public class CbitSet extends BitSet implements Serializable{
        private static final long serialVersionUID = 476550000000055127L;

        private static final long longOne = 1;
        private static final long long64 = 64;

        public CbitSet() {
            super();
        }

        public long[] toLongArray() {
            long[] longs = new long[this.size() / 64];
            for (int i = 0; i < longs.length; i++)
                for (int j = 0; j < 64; j++)
                    if (this.get(i * 64 + j))
                        longs[i] |= longOne << j;
            return longs;
        }

        public void fromLongArray(long[] longs) {
            for (int i=0; i<longs.length*64; i++) {
                if ((longs[i/64]&(longOne<<(i%long64))) != 0) {
                    this.set(i);
                }
            }
        }

        public String toBitString() {
            StringBuilder sb = new StringBuilder();
            for (int x = 0; x < this.size(); x++) {
                if (this.get(x)) {
                    sb.append("1");
                } else {
                    sb.append("0");
                }
            }
            return sb.toString();       
        }

        public void fromBitString(String string) {
            int pos = 0;
            for (byte chr : string.getBytes()) {
                if ('1' == chr) {
                    this.set(pos);
                }
                pos++;
            }
        }
        public void set(List<Integer> bits) {
            set(bits,true);
        }
        public void set(List<Integer> bits, boolean value) {
            if (bits != null) {
                for (Integer bit : bits) {
                    if (bit != null) {
                        this.set(bit.intValue(), value);
                    }
                }
            }
        }
        public void set(Integer bitIndex) {
            if (bitIndex != null) {
                super.set(bitIndex);
            }
        }
        public void set(Integer bitIndex, boolean value) {
            if (bitIndex != null) {
                super.set(bitIndex, value);
            }
        }   
    }

    Thank you for your help guys.

Answer 1

我也在学习......并且我倾向于同意另一个SO问题(here)的答案

Enums in Java are meant to be immutable objects, in which case there is no point in serializing any of their fields.

但是，如果出于任何原因，您坚持获取指定的编码结果，我发现可以通过将 SType 从 enum 更改为类，然后在其中嵌入另一个名为 EnumSType 的 enum 来实现这一点。

代码如下所示:

package SerializationQuestion1;

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="sType")
@XmlAccessorType(XmlAccessType.FIELD)   
public class SType {
    public enum EnumSType {
        S_V_INC ("VI", "V Inc"),
        S_V_EXC ("VE", "V Exc"),
        S_RP_INC ("RI", "RP Inc"),
        S_RP_EXC ("RE", "RP Exc"),
        S_V_AN_F ("VA", "V F All");

        @XmlElement
        private final String code;
        @XmlElement
        private final String description;
        EnumSType (String code, String description) {   // Bug fix 1
            this.code = code;
            this.description = description;
        }
        public String getCode() {
            return code;
        }
        public String getDescription() {
            return description;
        }
    }

    @XmlTransient
    private EnumSType sType;

    public EnumSType getsType() {
        return sType;
    }

    public void setsType(EnumSType sType) {
        this.sType = sType;
    }

    public SType () {};

    public SType (EnumSType sType) {
        this.sType = sType;
    }

    @XmlElement
    public String getCode() { return this.sType.getCode();};

    @XmlElement
    public String getDescription() { return this.sType.getDescription();};

    @XmlElement
    public String getName() { return this.sType.name();};
}

要实例化 RSIt 对象，代码现在如下所示:

RSIt rsit = new RSIt(new SType(EnumSType.S_V_INC), true, null);

以下是我的整理输出:

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<rSIt>
    <sType>
        <code>VI</code>
        <description>V Inc</description>
        <name>S_V_INC</name>
    </sType>
    <bits/>
    <mHave>true</mHave>
</rSIt>