GSON不会为接口的类型调用我的TypeAdapter [英] GSON not calling my TypeAdapter for a type which is an interface

问题描述

GSON似乎正在做一些诡计，看看我的JavaBeans的内部字段，而不是使用可公开访问的属性信息。不幸的是，这不会因为我们的神奇创建的bean充满私人领域，我不希望它存储。

  @Test 
 public void testJson（）抛出异常
 {
 Player player = new MagicPlayer（）; //BeanUtils.createDefault(Player.class）; 
 player.setName（Alice）; 
 
 Gson gson = new GsonBuilder（）
 .registerTypeAdapter（Player.class，new PlayerTypeAdapter（））
 .create（）; 
 
 System.out.println（gson.toJson（bean））; 
} 
 
 private static class PlayerTypeAdapter实现了JsonSerializer< Player> 
 {
 @Override 
 public JsonElement serialize（Player player，Type type，
 JsonSerializationContext context）
 {
 throw new RuntimeException（哇噢）; 
 
 
 
 public static interface Player // extends SupportsPropertyChanges 
 {
 public String getName（）; 
 public void setName（String name）; 
} 
 
 //简单的实现模拟我们正在做的事情。 
 public static class MagicPlayer implements Player 
 {
 private final String privateStuff =secret; 
私人字符串名称; 
 
 @Override 
 public String getName（）
 {
 return name; 
} 
 
 @Override 
 public void setName（String name）
 {
 this.name = name; 
 
 
 $ / code $ / pre 
 $ b $ p 
这给出：
 
 
  {privateStuff：secret，name：Alice} 
  
当然，从来不会调用我的类型适配器，这似乎使得不可能发生任何其他行为。   方案

我有同样的问题，与当前版本的gson（2.3.1）并通过使用

  .registerTypeHierarchyAdapter（Player.class，new PlayerTypeAdapter（））
  

p>



  .registerTypeAdapter（Player.class，new PlayerTypeAdapter（））
  




GSON appears to be doing some kind of trick where it looks at the internal fields of my JavaBeans instead of using the publically-accessible property information. Unfortunately this won't fly for us because our magically-created beans are full of private fields which I don't want it to store off.

@Test
public void testJson() throws Exception
{
    Player player = new MagicPlayer(); //BeanUtils.createDefault(Player.class);
    player.setName("Alice");

    Gson gson = new GsonBuilder()
        .registerTypeAdapter(Player.class, new PlayerTypeAdapter())
        .create();

    System.out.println(gson.toJson(bean));
}

private static class PlayerTypeAdapter implements JsonSerializer<Player>
{
    @Override
    public JsonElement serialize(Player player, Type type,
                                 JsonSerializationContext context)
    {
        throw new RuntimeException("I got called, woohoo");
    }
}

public static interface Player //extends SupportsPropertyChanges
{
    public String getName();
    public void setName(String name);
}

// Simple implementation simulating what we're doing.
public static class MagicPlayer implements Player
{
    private final String privateStuff = "secret";
    private String name;

    @Override
    public String getName()
    {
        return name;
    }

    @Override
    public void setName(String name)
    {
        this.name = name;
    }
}

This gives:

{"privateStuff":"secret","name":"Alice"}

And of course, never calls my type adapter, which seemingly makes it impossible to get any other behaviour.

解决方案

I had the same issue, with the current version of gson (2.3.1) and got it working by using

.registerTypeHierarchyAdapter(Player.class, new PlayerTypeAdapter())

instead of

.registerTypeAdapter(Player.class, new PlayerTypeAdapter())

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