如何使用Gson序列化java.nio.file.Path？

java gson nio

2022-09-04 03:30:11

我在尝试序列化包含java.lang.StackOverflowErrorObjectjava.nio.file.Path

即使我写道：

public class PathConverter implements JsonDeserializer<Path>, JsonSerializer<Path> {
    @Override
    public Path deserialize(JsonElement jsonElement, Type type, JsonDeserializationContext jsonDeserializationContext) throws JsonParseException {
        return Paths.get(jsonElement.getAsString());
    }

    @Override
    public JsonElement serialize(Path path, Type type, JsonSerializationContext jsonSerializationContext) {
        return new JsonPrimitive(path.toString());
    }
}

并应用它：

    String json = new GsonBuilder()
            .registerTypeAdapter(Path.class, new PathConverter())
            .create()
            .toJson(constructorSetup, new TypeToken<ConstructorSetup>() {}.getType());

我仍然无法序列化此类：

public class ConstructorSetup {

    private Path appIconMimmapDirPathOnPc;

}

堆栈跟踪：（在粘贴纸箱上完整）)

Exception in thread "main" java.lang.StackOverflowError
    at com.google.gson.internal.$Gson$Types.resolve($Gson$Types.java:380)
    at com.google.gson.internal.$Gson$Types.resolve($Gson$Types.java:375)
    at com.google.gson.internal.$Gson$Types.resolve($Gson$Types.java:380)
        ...
    at com.google.gson.internal.$Gson$Types.resolve($Gson$Types.java:380)
    at com.google.gson.internal.$Gson$Types.resolve($Gson$Types.java:355)
    at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory.getBoundFields(ReflectiveTypeAdapterFactory.java:117)
    at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory.create(ReflectiveTypeAdapterFactory.java:72)
    at com.google.gson.Gson.getAdapter(Gson.java:356)
    at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$1.<init>(ReflectiveTypeAdapterFactory.java:82)
    at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory.createBoundField(ReflectiveTypeAdapterFactory.java:81)
    at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory.getBoundFields(ReflectiveTypeAdapterFactory.java:118)
    at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory.create(ReflectiveTypeAdapterFactory.java:72)
    at com.google.gson.Gson.getAdapter(Gson.java:356)
        ...
    at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$1.<init>(ReflectiveTypeAdapterFactory.java:82)
    at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory.createBoundField(ReflectiveTypeAdapterFactory.java:81)
    at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory.getBoundFields(ReflectiveTypeAdapterFactory.java:118)
    at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory.create(ReflectiveTypeAdapterFactory.java:72)
    at com.google.gson.Gson.getAdapter(Gson.java:356)

任何解决方案？

答案 1

你的问题是..假设您使用了它将在我的Windows PC上创建类似的东西的实例。现在，您必须告诉GSON如何反序列化此类型：PathinterfacePaths.get("/")WindowsPath

ConstructorSetup setup = new ConstructorSetup();
setup.setAppIconMimmapDirPathOnPc(Paths.get("/"));

// here we get actual class type of our Path object
Class classT = setup.getAppIconMimmapDirPathOnPc().getClass();

Gson gson = new GsonBuilder().registerTypeAdapter(classT, new MyPathConverter())

您可以采用的另一种方法是：registerTypeHierarchyAdapter

.registerTypeHierarchyAdapter(Path.class, new MyPathConverter())

typeHierarchyAdapter 的目的是在您希望对某个类型的所有子类型使用相同的表示时覆盖这种情况，这正是您的情况。Path

答案 2