反序列化以在运行时键入

本文介绍了反序列化以在运行时键入的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！ 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 { } }; } }