在Jaxb中編組地圖的問題

Question

我有一個類世界包含人類地圖。如果我編組世界我得到以下輸出：

<world> 
    <humans> 
     <human key="2"> 
      <value> 
       <name>Tom</name> 
      </value> 
     </human> 
     <human key="1"> 
      <value> 
       <name>Max</name> 
      </value> 
     </human> 
    </humans> 
</world> 

但我不想顯示「價值」 - 標籤。它應該看起來像：

<world> 
    <humans> 
     <human key="2"> 
      <name>Tom</name> 
     </human> 
     <human key="1"> 
      <name>Max</name> 
     </human> 
    </humans> 
</world> 

這可能嗎？

這裏是一流的世界和人類的代碼：

@XmlRootElement 
public class Human { 

    @XmlElement 
    private String name; 

    public Human(){} 
} 

@XmlRootElement 
public class World { 

    private Map<String, Human> humans = new HashMap<String, Human>(); 

    public World(){} 

    @XmlElementWrapper(name = "humans") 
    @XmlElement(name = "human") 
    public HumanEntry[] getMap() { 
     List<HumanEntry> list = new ArrayList<HumanEntry>(); 
     for (Entry<String, Human> entry : humans.entrySet()) { 
      HumanEntry mapEntry =new HumanEntry(); 
      mapEntry.key = entry.getKey(); 
      mapEntry.value = entry.getValue(); 
      list.add(mapEntry); 
     } 
     return list.toArray(new HumanEntry[list.size()]); 
    } 

    public void setMap(HumanEntry[] arr) { 
     for(HumanEntry entry : arr) { 
      this.humans.put(entry.key, entry.value); 
     } 
    } 

    public static class HumanEntry { 
     @XmlAttribute 
     public String key; 

     @XmlElement 
     public Human value; 
    } 

    public void addHuman(String key, Human human){ 
     this.humans.put(key, human); 
    } 
} 

Answer 1

正如ilcavero指出的那樣，XmlAdapter可以用於在JAXB中應用映射（或任何類型）的替代映射。下面是一個鏈接到一個具體的例子：

• http://blog.bdoughan.com/2010/07/xmladapter-jaxbs-secret-weapon.html

更多信息

• http://blog.bdoughan.com/search/label/XmlAdapter

Answer 2

我認爲你正在尋找XmlValue註釋：http://jaxb.java.net/tutorial/section_6_2_7_4-Mapping-a-Class-to-Simple-Content-or-Simple-Type-XmlValue.html#Mapping%20a%20Class%20to%20Simple%20Content%20or%20Simple%20Type:%20XmlValue

在你的情況下，將被應用到HumanEntry.value代替的XmlElement

Answer 3

我的解決方案

我添加鍵屬性到人類，然後我轉換地圖以數組：

@XmlRootElement 
public class World { 

    @XmlJavaTypeAdapter(HumanAdapter.class) 
    private Map<String, Human> humans = new HashMap<String, Human>(); 

    public World(){} 
} 

public class Human { 

    @XmlElement 
    private String name; 

    @XmlAttribute(name="key") 
    private String key; 

    public Human(){} 
} 

public class HumanAdapter extends XmlAdapter<HumanJaxbCrutch, Map<String, Human>> { 

    @Override 
    public HumanJaxbCrutch marshal(Map<String, Human> humans) throws Exception { 
     List<Human> list = new ArrayList<Human>(); 
     for (Entry<String, Human> entry : humans.entrySet()) { 
      list.add(entry.getValue()); 
     } 

     HumanJaxbCrutch humanJaxbCrutch = new HumanJaxbCrutch(); 
     humanJaxbCrutch.setCourses(list.toArray(new Human[list.size()])); 

     return humanJaxbCrutch; 
    } 

    @Override 
    public Map<String, Human> unmarshal(HumanJaxbCrutch humans) throws Exception { 
     Map<String, Human> map = new HashMap<String, Human>(); 

     for(Human human : humans.getCourses()){ 
      map.put(human.getKey(), human); 
     } 

     return map; 
    } 
} 

class HumanJaxbCrutch { 

    private Human[] courses; 

    @XmlElement(name = "human") 
    public Human[] getCourses() { 
     return courses; 
    } 

    public void setCourses(Human[] courses) { 
     this.courses = courses; 
    } 
}