反序列化以在运行时键入 [英] Deserialize to type at runtime

问题描述

我试图使用 TypeAdapterFactory 来序列化和反序列化一些客户对象。我想在运行时将所有对象序列化为一个特定的类型。

所以给定一个 String classpath 和一个 JsonObject对象我想将对象反序列化为 Class.forName（classpath）的实例。

  public< T> TypeAdapter< T> create（final Gson gson，final TypeToken< T> tokenType）
 {
 final TypeAdapter< T> delegate = gson.getDelegateAdapter（this，tokenType）; 
 final TypeAdapter< JsonElement> elementAdapter = gson.getAdapter（JsonElement.class）; 
 
返回新的TypeAdapter< T>（）
 {
 @Override 
 public T read（JsonReader reader）抛出IOException 
 {
 Class< ;？> clazz = Class.forName（classpath）; 
 JsonObject jsonObject = elementAdapter.read（reader）.getAsJsonObject（）; 
 
 //这里我想返回一个clazz实例
 
 $ b @Override 
 public void write（JsonWriter writer，T value）throws IOException 
 {
} 
}; 
} 
  

我会怎么做？
<您可以尝试这样的事情（代码不会编译，您需要捕获异常）。解决方案您可以尝试这样的事情（代码不会编译，您需要捕获异常）。也许有更好的语法 THIS 。

实现TypeAdapterFactory {
@Override
public< T> TypeAdapter< T> create（final Gson gson，final TypeToken< T> tokenType）{
final MyClass THIS = this;

返回新的TypeAdapter< T>（）{
@Override
public T read（JsonReader reader）throws IOException {
Class<？> clazz = Class.forName（classpath）;

TypeToken< T> token =（TypeToken< T>）TypeToken.get（clazz）;
TypeAdapter< T> adapter = gson.getDelegateAdapter（THIS，token）;
JsonElement tree = gson.getAdapter（JsonElement.class）.read（reader）;
T out = adapter.fromJsonTree（tree）;

退出;
}

@Override
public void write（JsonWriter writer，T value）throws IOException {
}
};
}
}

I am trying to use TypeAdapterFactory to serialize and deserialize some customer objects. I would like to serialize all the objects to a particular type at runtime.

So given a String classpath and a JsonObject object I would like to deserialize the object to an instance of Class.forName(classpath).

public <T> TypeAdapter<T> create(final Gson gson, final TypeToken<T> tokenType)
{
    final TypeAdapter<T> delegate = gson.getDelegateAdapter(this, tokenType);
    final TypeAdapter<JsonElement> elementAdapter = gson.getAdapter(JsonElement.class);

    return new TypeAdapter<T>()
        {
            @Override
            public T read(JsonReader reader) throws IOException
            {
                Class<?> clazz = Class.forName(classpath);
                JsonObject jsonObject = elementAdapter.read(reader).getAsJsonObject();

                // Here I want to return an instance of clazz
            }

            @Override
            public void write(JsonWriter writer, T value) throws IOException
            {
            }
        };
}

How would I go about this?

解决方案

You can try something like this (code wont compile, you need to catch exceptions). Maybe there is a better syntax for THIS too.

final class MyClass implements TypeAdapterFactory {
  @Override
  public <T> TypeAdapter<T> create(final Gson gson, final TypeToken<T> tokenType) {
    final MyClass THIS = this;

    return new TypeAdapter<T>() {
      @Override
      public T read(JsonReader reader) throws IOException {
        Class<?> clazz = Class.forName(classpath);

        TypeToken<T> token = (TypeToken<T>) TypeToken.get(clazz);
        TypeAdapter<T> adapter = gson.getDelegateAdapter(THIS, token);
        JsonElement tree = gson.getAdapter(JsonElement.class).read(reader);
        T out = adapter.fromJsonTree(tree);

        return out;
      }

      @Override
      public void write(JsonWriter writer, T value) throws IOException {
      }
    };
  }
}

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