自定义地图<对象，对象> XmlAdapter [英] Custom Map<Object,Object> XmlAdapter

问题描述

我正在尝试调整一个 Map< Integer，String> XmlAdapter $ C>地图<对象，对象> 。该方法基于以下文章： XmlAdapter - JAXB的秘密武器

测试工具中的这一行生成 NullPointerException ：

  JAXBContext jc = JAXBContext.newInstance（Foo.class）; 
  

如果我将线束和MapAdapter / MapEntry更改为 T< Integer， String> ，代码按预期工作。

我缺少什么？可以将 Object 类型序列化，还是需要作为另一个较少抽象的类来转换？如果是这样，我会认为我会在 marshal（）方法中遇到这个错误，但从来没有达到这个目的（至少在Netbean的调试器中）。

MapEntryType：

  public class MyMapEntryType {
 
 @XmlAttribute 
 public Object key; 
 
 @XmlValue 
 public Object value; 
 
} 
  

MapType：

  public class MyMapType {
 
 public List< MyMapEntryType> entry = new ArrayList< MyMapEntryType>（）; 
 
} 
  

MapAdapter：

  public final class MyMapAdapter extends 
 
 XmlAdapter< MyMapType，Map< Object，Object>> {
 
 @Override 
 public MyMapType marshal（Map&Object; Object> arg0）throws Exception {
 
 MyMapType myMapType = new MyMapType（）; 
 
 for（Entry< Object，Object> entry：arg0.entrySet（））{
 
 MyMapEntryType myMapEntryType = new MyMapEntryType（）; 
 myMapEntryType.key = entry.getKey（）; 
 myMapEntryType.value = entry.getValue（）; 
 myMapType.entry.add（myMapEntryType）; 
 
} 
 
返回myMapType; 
} 
 
 @Override 
 public Map< Object，Object> unmarshal（MyMapType arg0）throws Exception {
 
 HashMap< Object，Object> hashMap = new HashMap< Object，Object>（）; 
 
（MyMapEntryType myEntryType：arg0.entry）{
 hashMap.put（myEntryType.key，myEntryType.value）; 
} 
 
返回hashMap; 
} 
 
} 
  

要编组的对象/未组织的对象：

  @XmlRootElement 
 @XmlAccessorType（XmlAccessType.FIELD）
 public class Foo {
 
 @XmlJavaTypeAdapter（MyMapAdapter.class）
映射< Object，Object> map = new HashMap< Object，Object>（）; 
 
 public Map getMap（）{
 return map; 
} 
 
 public void setMap（Map map）{
 this.map = map; 
} 
 
} 
  

测试工具：

  Map< Object，Object> xyz = new HashMap< Object，Object>（）; 
 xyz.put（key0，value0）; 
 xyz.put（key1，value1）; 
 
 Foo foo = new Foo（）; 
 foo.setMap（xyz）; 
 
 //生成NullPointerException 
 JAXBContext jc = JAXBContext.newInstance（Foo.class）; 
 
 Marshaller marshaller = jc.createMarshaller（）; 
 marshaller.setProperty（Marshaller.JAXB_FORMATTED_OUTPUT，true）; 
 marshaller.marshal（foo，System.out）; 
  

堆栈跟踪：

 code $ java.lang.NullPointerException 
 at com.sun.xml.internal.bind.v2.runtime.reflect.TransducedAccessor.get（TransducedAccessor.java:154）
 at com.sun .xml.internal.bind.v2.runtime.property.ValueProperty。< init>（ValueProperty.java:66）
在com.sun.xml.internal.bind.v2.runtime.property.PropertyFactory.create （PropertyFactory.java:95）
在com.sun.xml.internal.bind.v2.runtime.ClassBeanInfoImpl。< init>（ClassBeanInfoImpl.java:145）
在com.sun.xml。 internal.bind.v2.runtime.JAXBContextImpl.getOrCreate（JAXBContextImpl.java:479）
在com.sun.xml.internal.bind.v2.runtime.JAXBContextImpl.getOrCreate（JAXBContextImpl.java:498）
在com.sun.xml.internal.bind.v2.runtime.property.ArrayElementProperty。< init>（ArrayElementProperty.java:97）
在com.sun.xml.internal.bind.v2.runtime。 property.ArrayElementNodeProperty。< init>（ArrayElementNodeProperty.java:47）
 at sun.reflect.NativeConstructorAccessorImpl.newInstance0（Native Method）
 at sun.reflect.NativeConstructorAccessorImpl.newInstance（NativeConstructorAccessorImpl.java:39）
 at sun.reflect.DelegatingConstructorAccessorImpl.newInstance（DelegatingConstructorAccessorImpl.java:27） 
在java.lang.reflect.Constructor.newInstance（Constructor.java:513）
在com.sun.xml.internal.bind.v2.runtime.property.PropertyFactory.create（PropertyFactory.java： 113）
在com.sun.xml.internal.bind.v2.runtime.ClassBeanInfoImpl。< init>（ClassBeanInfoImpl.java:145）
在com.sun.xml.internal.bind.v2 .runtime.JAXBContextImpl.getOrCreate（JAXBContextImpl.java:479）
在com.sun.xml.internal.bind.v2.runtime.JAXBContextImpl.getOrCreate（JAXBContextImpl.java:498）
在com.sun .xml.internal.bind.v2.runtime.property.SingleElementNodeProperty。< init>（SingleElementNodeProperty.java:90）
 at sun.reflect.NativeConstructorAccessorImpl.newInstance0（Native Met hod）
 at sun.reflect.NativeConstructorAccessorImpl.newInstance（NativeConstructorAccessorImpl.java:39）
 at sun.reflect.DelegatingConstructorAccessorImpl.newInstance（DelegatingConstructorAccessorImpl.java:27）
在java.lang.reflect .Constructor.newInstance（Constructor.java:513）
在com.sun.xml.internal.bind.v2.runtime.property.PropertyFactory.create（PropertyFactory.java:113）
在com.sun .xml.internal.bind.v2.runtime.ClassBeanInfoImpl。< init>（ClassBeanInfoImpl.java:145）
在com.sun.xml.internal.bind.v2.runtime.JAXBContextImpl.getOrCreate（JAXBContextImpl.java ：479）
 at com.sun.xml.internal.bind.v2.runtime.JAXBContextImpl。< init>（JAXBContextImpl.java:305）
 at com.sun.xml.internal.bind。 v2.runtime.JAXBContextImpl $ JAXBContextBuilder.build（JAXBContextImpl.java:1100）
 at com.sun.xml.internal.bind.v2.ContextFactory.createContext（ContextFactory.java:143）
 at com。 sun.xml.internal.bind.v2.ContextFactory.createConte xt（ContextFactory.java:110）
 at sun.reflect.NativeMethodAccessorImpl.invoke0（Native Method）
 at sun.reflect.NativeMethodAccessorImpl.invoke（NativeMethodAccessorImpl.java:39）
 at sun。 reflect.DelegatingMethodAccessorImpl.invoke（DelegatingMethodAccessorImpl.java:25）
在java.lang.reflect.Method.invoke（Method.java:597）
在javax.xml.bind.ContextFinder.newInstance（ContextFinder。 java：228）
在javax.xml.bind.ContextFinder.newInstance（ContextFinder.java:215）
在javax.xml.bind.ContextFinder.find（ContextFinder.java:414）
在javax.xml.bind.JAXBContext.newInstance（JAXBContext.java:618）
在javax.xml.bind.JAXBContext.newInstance（JAXBContext.java:565）
  

我将地图从 Map< Object，Object> 更改为 Map< String，Object> 来更好地表示我的需要（我也改变了所有的内部对象来匹配）。我将 @XmlAnyElement 和 @XmlMixed 注释添加到 MyMapEntryType class;我删除了 @XmlValue 注释。

当我调试代码时，这行不会产生错误（hurray ）：

  JAXBContext jc = JAXBContext.newInstance（PropertyBag.class）; 
  

但是，尝试组织此条目：

  xyz.put（key0，1）; 
  

结果显示错误：

 无法组织类型java.lang.Integer作为元素，因为它缺少一个@ XmlRootElement注释
  

解决方案

我可以通过在内部使用Map来解决这个问题：

MyMapEntryType：

  public class MyMapEntryType {
 
 @XmlAttribute 
 public String key; 
 
 @XmlValue 
 public String value; 
 
 private MyMapEntryType（）{
 // JAXB 
} 
 
 public MyMapEntryType（String key，String value）{
 this .key = key; 
 this.value = value; 
} 
 
} 
  

MyMapType类：

  public class MyMapType {
 
 @XmlElement（name =Property）
 public List< MyMapEntryType> entry = new ArrayList< MyMapEntryType>（）; 
 
} 
 
 public class MyMapAdapter扩展XmlAdapter< MyMapType，Map< String，Object>> {
 
 @Override 
 public MyMapType marshal（Map< String，Object> bt）throws异常{
 
 MyMapType myMapType = new MyMapType（）;对于（Map.Entry< String，Object>条目：bt.entrySet（））的
 
 {
 
 MyMapEntryType myMapEntryType = new MyMapEntryType（entry.getKey（），entry.getValue （）的ToString（））; 
 myMapType.entry.add（myMapEntryType）; 
 
} 
 
返回myMapType; 
 
} 
 
 ... 
 
} 
  

PropertyBag（nee Foo）类：

  @XmlRootElement（name =PropertyBag）
 public class PropertyBag {
 
 private Map< String，Object>地图; 
 
 public PropertyBag（）{
 map = new HashMap< String，Object>（）; 
} 
 
 @XmlJavaTypeAdapter（MyMapAdapter.class）
 @XmlElement（name =Properties）
 public Map< String，Object> getMap（）{
 return map; 
} 
 
 public void setMap（Map< String，Object> map）{
 this.map = map; 
} 
 
} 
  

线束：

  Map< String，Object> parent = new HashMap< String，Object>（）; 
 parent.put（SI_EMAIL_ADDRESS，[e-mail]）; 
 parent.put（SI_DATE，new Date（））; 
 parent.put（SI_GUID，ATQJj1RvgVlLqDqP_VOGltM）; 
 parent.put（SI_BOOLEAN，true）; 
 parent.put（SI_INT，1318）; 
 parent.put（SI_LONG，new Long（123456789））; 
 parent.put（SI_INTEGER，new Integer（23456））; 
 
 
 PropertyBag bag = new PropertyBag（）; 
 bag.setMap（parent）; 
 
 JAXBContext jc = JAXBContext.newInstance（PropertyBag.class）; 
 Marshaller marshaller = jc.createMarshaller（）; 
 marshaller.setProperty（Marshaller.JAXB_FORMATTED_OUTPUT，true）; 
 marshaller.marshal（bag，System.out）; 
  

输出：

 code><&的PropertyBag GT; 
<属性> 
< Property key =SI_INT> 1318< / Property> 
< Property key =SI_DATE> Wed Feb 01 22:18:35 EST 2012< / Property> 
< Property key =SI_BOOLEAN> true< / Property> 
< Property key =SI_LONG> 123456789< / Property> 
<属性key =SI_INTEGER> 23456< / Property> 
< Property key =SI_GUID> ATQJj1RvgVlLqDqP_VOGltM< / Property> 
< Property key =SI_EMAIL_ADDRESS> [e-mail]< / Property> 
< /属性> 
< / PropertyBag> 
  

理想情况下，我希望将XML表示为：

 <属性> 
< SI_INT> 1318< / SI_INT> 
< SI_DATE> Wed Feb 01 22:18:35 EST 2012< / SI_DATE> 
< SI_BOOLEAN> true< / SI_BOOLEAN> 
< SI_LONG> 123456789< / SI_LONG> 
< SI_INTEGER> 23456< / SI_INTEGER> 
< SI_GUID> ATQJj1RvgVlLqDqP_VOGltM< / SI_GUID> 
< SI_EMAIL_ADDRESS> [e-mail]< / SI_EMAIL_ADDRESS> 
< /属性> 
  

我也希望能够序列化子属性：

  ... 
 
映射< String，Object> child = new HashMap< String，Object>（）; 
 child.put（1，33217）; 
 child.put（2，36351）; 
 child.put（SI_TOTAL，2）; 
 parent.put（SI_LIST，child）; 
  

哪些代表：

 <性状> 
< SI_INT> 1318< / SI_INT> 
< SI_DATE> Wed Feb 01 22:18:35 EST 2012< / SI_DATE> 
< SI_BOOLEAN> true< / SI_BOOLEAN> 
< SI_LONG> 123456789< / SI_LONG> 
< SI_INTEGER> 23456< / SI_INTEGER> 
< SI_GUID> ATQJj1RvgVlLqDqP_VOGltM< / SI_GUID> 
< SI_EMAIL_ADDRESS> [e-mail]< / SI_EMAIL_ADDRESS> 
< SI_LIST> 
<！ - 数字元素是非法的;重构 - > 
< 1 33217< / 1> 
< 2> 36351< / 2> 
< SI_TOTAL> 2< / SI_TOTAL> 
< / SI_LIST> 
< /属性> 
  

但我不确定我可以使用注释将键名转换为元素。 / p>

I'm trying to adapt a Map<Integer,String> XmlAdapter to one that supports Map<Object,Object>. The approach is based on this article: XmlAdapter - JAXB's Secret Weapon

This line in the testing harness generates NullPointerException:

JAXBContext jc = JAXBContext.newInstance(Foo.class);

If I change the harness and MapAdapter/MapEntry to be T<Integer,String>, the code works as expected.

What am I missing? Can the Object type be serialized or does it need to be cast as another, less abstract class? If so, I would think that I would encounter this error in the marshal() method, but it never seems to reach this point (at least in Netbean's debugger).

MapEntryType:

public class MyMapEntryType {

    @XmlAttribute
    public Object key; 

    @XmlValue
    public Object value;

}

MapType:

public class MyMapType {

    public List<MyMapEntryType> entry = new ArrayList<MyMapEntryType>();

}

MapAdapter:

public final class MyMapAdapter extends

   XmlAdapter<MyMapType,Map<Object, Object>> {

   @Override
   public MyMapType marshal(Map<Object, Object> arg0) throws Exception {

      MyMapType myMapType = new MyMapType();

      for(Entry<Object, Object> entry : arg0.entrySet()) {

         MyMapEntryType myMapEntryType =  new MyMapEntryType();
         myMapEntryType.key = entry.getKey();
         myMapEntryType.value = entry.getValue();
         myMapType.entry.add(myMapEntryType);

      }

      return myMapType;
   }

   @Override
   public Map<Object, Object> unmarshal(MyMapType arg0) throws Exception {

      HashMap<Object, Object> hashMap = new HashMap<Object, Object>();

      for(MyMapEntryType myEntryType : arg0.entry) {
         hashMap.put(myEntryType.key, myEntryType.value);
      }

      return hashMap;
   }

}

Object to be marshalled/unmarshalled:

@XmlRootElement
@XmlAccessorType(XmlAccessType.FIELD)
public class Foo {

   @XmlJavaTypeAdapter(MyMapAdapter.class)
   Map<Object, Object> map = new HashMap<Object, Object>();

   public Map getMap() {
      return map;
   }

   public void setMap(Map map) {
      this.map = map;
   }

}

Testing harness:

Map<Object,Object> xyz = new HashMap<Object,Object>();
xyz.put("key0", "value0");
xyz.put("key1", "value1");

Foo foo = new Foo();
foo.setMap(xyz);

//generates NullPointerException                
JAXBContext jc = JAXBContext.newInstance(Foo.class);

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

Stack trace:

java.lang.NullPointerException
    at com.sun.xml.internal.bind.v2.runtime.reflect.TransducedAccessor.get(TransducedAccessor.java:154)
    at com.sun.xml.internal.bind.v2.runtime.property.ValueProperty.<init>(ValueProperty.java:66)
    at com.sun.xml.internal.bind.v2.runtime.property.PropertyFactory.create(PropertyFactory.java:95)
    at com.sun.xml.internal.bind.v2.runtime.ClassBeanInfoImpl.<init>(ClassBeanInfoImpl.java:145)
    at com.sun.xml.internal.bind.v2.runtime.JAXBContextImpl.getOrCreate(JAXBContextImpl.java:479)
    at com.sun.xml.internal.bind.v2.runtime.JAXBContextImpl.getOrCreate(JAXBContextImpl.java:498)
    at com.sun.xml.internal.bind.v2.runtime.property.ArrayElementProperty.<init>(ArrayElementProperty.java:97)
    at com.sun.xml.internal.bind.v2.runtime.property.ArrayElementNodeProperty.<init>(ArrayElementNodeProperty.java:47)
    at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
    at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39)
    at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)
    at java.lang.reflect.Constructor.newInstance(Constructor.java:513)
    at com.sun.xml.internal.bind.v2.runtime.property.PropertyFactory.create(PropertyFactory.java:113)
    at com.sun.xml.internal.bind.v2.runtime.ClassBeanInfoImpl.<init>(ClassBeanInfoImpl.java:145)
    at com.sun.xml.internal.bind.v2.runtime.JAXBContextImpl.getOrCreate(JAXBContextImpl.java:479)
    at com.sun.xml.internal.bind.v2.runtime.JAXBContextImpl.getOrCreate(JAXBContextImpl.java:498)
    at com.sun.xml.internal.bind.v2.runtime.property.SingleElementNodeProperty.<init>(SingleElementNodeProperty.java:90)
    at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
    at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39)
    at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)
    at java.lang.reflect.Constructor.newInstance(Constructor.java:513)
    at com.sun.xml.internal.bind.v2.runtime.property.PropertyFactory.create(PropertyFactory.java:113)
    at com.sun.xml.internal.bind.v2.runtime.ClassBeanInfoImpl.<init>(ClassBeanInfoImpl.java:145)
    at com.sun.xml.internal.bind.v2.runtime.JAXBContextImpl.getOrCreate(JAXBContextImpl.java:479)
    at com.sun.xml.internal.bind.v2.runtime.JAXBContextImpl.<init>(JAXBContextImpl.java:305)
    at com.sun.xml.internal.bind.v2.runtime.JAXBContextImpl$JAXBContextBuilder.build(JAXBContextImpl.java:1100)
    at com.sun.xml.internal.bind.v2.ContextFactory.createContext(ContextFactory.java:143)
    at com.sun.xml.internal.bind.v2.ContextFactory.createContext(ContextFactory.java:110)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
    at java.lang.reflect.Method.invoke(Method.java:597)
    at javax.xml.bind.ContextFinder.newInstance(ContextFinder.java:228)
    at javax.xml.bind.ContextFinder.newInstance(ContextFinder.java:215)
    at javax.xml.bind.ContextFinder.find(ContextFinder.java:414)
    at javax.xml.bind.JAXBContext.newInstance(JAXBContext.java:618)
    at javax.xml.bind.JAXBContext.newInstance(JAXBContext.java:565)

I changed the Map from Map<Object,Object> to Map<String,Object> to better represent my needs (I also changed all of the internal objects to match this). I added @XmlAnyElement and @XmlMixed annotations to the Object property of the MyMapEntryType class; I removed the @XmlValue annotation.

When I debug the code, this line does NOT produce an error (hurray):

JAXBContext jc = JAXBContext.newInstance(PropertyBag.class);

However, attempting to marshal this entry:

xyz.put("key0", 1);

Results in an error that reads:

unable to marshal type `java.lang.Integer` as an element because it is missing an `@XmlRootElement` annotation

解决方案

I was able to solve this by using a Map internally:

MyMapEntryType:

public class MyMapEntryType {

    @XmlAttribute
    public String key; 

    @XmlValue
    public String value;

    private MyMapEntryType() {
        //Required by JAXB
    } 

    public MyMapEntryType(String key, String value) {
        this.key   = key;
        this.value = value;
    }

}

MyMapType class:

public class MyMapType {

    @XmlElement(name="Property")
    public List<MyMapEntryType> entry = new ArrayList<MyMapEntryType>();

}

public class MyMapAdapter extends XmlAdapter<MyMapType, Map<String,Object>> {

    @Override
    public MyMapType marshal(Map<String,Object> bt) throws Exception {

        MyMapType myMapType =  new MyMapType();

        for(Map.Entry<String,Object> entry : bt.entrySet()) {

            MyMapEntryType myMapEntryType = new MyMapEntryType(entry.getKey(), entry.getValue().toString());
            myMapType.entry.add(myMapEntryType);

        }

        return myMapType;

    }

    ...

}

PropertyBag (nee Foo) class:

@XmlRootElement(name="PropertyBag")
public class PropertyBag {

    private Map<String,Object> map;

    public PropertyBag() {
        map = new HashMap<String,Object>();
    }

    @XmlJavaTypeAdapter(MyMapAdapter.class)
    @XmlElement(name="Properties")
    public Map<String,Object> getMap() {
        return map;
    }

    public void setMap(Map<String,Object> map) {
        this.map = map;
    }

}

Harness:

        Map<String, Object> parent = new HashMap<String, Object>();
        parent.put("SI_EMAIL_ADDRESS", "[e-mail]");
        parent.put("SI_DATE", new Date());
        parent.put("SI_GUID", "ATQJj1RvgVlLqDqP_VOGltM");
        parent.put("SI_BOOLEAN", true);
        parent.put("SI_INT", 1318);
        parent.put("SI_LONG", new Long(123456789));
        parent.put("SI_INTEGER", new Integer(23456));


        PropertyBag bag = new PropertyBag();
        bag.setMap(parent);

        JAXBContext jc = JAXBContext.newInstance(PropertyBag.class);            
        Marshaller marshaller = jc.createMarshaller();
        marshaller.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, true);
        marshaller.marshal(bag, System.out);

Output:

<PropertyBag>
    <Properties>
        <Property key="SI_INT">1318</Property>
        <Property key="SI_DATE">Wed Feb 01 22:18:35 EST 2012</Property>
        <Property key="SI_BOOLEAN">true</Property>
        <Property key="SI_LONG">123456789</Property>
        <Property key="SI_INTEGER">23456</Property>
        <Property key="SI_GUID">ATQJj1RvgVlLqDqP_VOGltM</Property>
        <Property key="SI_EMAIL_ADDRESS">[e-mail]</Property>
    </Properties>
</PropertyBag>

Ideally, I'd like to have the XML represented like:

<Properties>
    <SI_INT>1318</SI_INT>
    <SI_DATE>Wed Feb 01 22:18:35 EST 2012</SI_DATE>
    <SI_BOOLEAN>true</SI_BOOLEAN>
    <SI_LONG>123456789</SI_LONG>
    <SI_INTEGER>23456</SI_INTEGER>
    <SI_GUID>ATQJj1RvgVlLqDqP_VOGltM</SI_GUID>
    <SI_EMAIL_ADDRESS>[e-mail]</SI_EMAIL_ADDRESS>
</Properties>

I'd also like to be able to serialize subproperties:

...

Map<String,Object> child = new HashMap<String,Object>();
child.put("1", 33217);
child.put("2", 36351);
child.put("SI_TOTAL", 2);
parent.put("SI_LIST", child);

Which would be represented:

<Properties>
    <SI_INT>1318</SI_INT>
    <SI_DATE>Wed Feb 01 22:18:35 EST 2012</SI_DATE>
    <SI_BOOLEAN>true</SI_BOOLEAN>
    <SI_LONG>123456789</SI_LONG>
    <SI_INTEGER>23456</SI_INTEGER>
    <SI_GUID>ATQJj1RvgVlLqDqP_VOGltM</SI_GUID>
    <SI_EMAIL_ADDRESS>[e-mail]</SI_EMAIL_ADDRESS>
    <SI_LIST>
        <!-- numeric elements are illegal; refactor -->
        <1>33217</1>
        <2>36351</2>
        <SI_TOTAL>2</SI_TOTAL>
    </SI_LIST>
</Properties>

But I'm not certain that I can use annotation to convert a key name to an element.

这篇关于自定义地图&lt;对象，对象&gt; XmlAdapter的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！