如何从 Java 中的泛型类型反序列化 JSON 对象？

Question

我正在尝试将 JSON 响应映射如下：

{
    object: {
    id: 1
    name: "my name"
    email: "username@mail.com"
    username: "username"
    password: "password"
    mobile: "##########"
    fbAccessToken: "----------"
    img: null
    }
    errorMessage: ""
    successMessage: ""
    technicalErrorMessage: ""
    error: false
  }

所以我写了这个方法：

private <T> ResponseEntity<T> processedRequest(HttpRequestBase requestBase, Class<T> tClass) throws IOException {
        HttpResponse response = httpClient.execute(requestBase);
        HttpEntity entity = response.getEntity();
        Reader reader = new InputStreamReader(entity.getContent());

        Type type = new TypeToken<ResponseEntity<T>>() {}.getType();

        ResponseEntity<T> responseEntity = gson.fromJson(reader, type);

        return responseEntity;
    }

基于ResponseEntity class:

public class ResponseEntity<T> {

private T object;
private boolean isError;
private String errorMessage;
private String successMessage;
private String technicalErrorMessage;

public ResponseEntity() {
    setSuccessMessage("");
    setError(false);
    setErrorMessage("");
    setTechnicalErrorMessage("");
}

public T getObject() {
    return object;
}

public void setObject(T object) {
    this.object = object;
}

public boolean isError() {
    return isError;
}

public void setError(boolean error) {
    this.isError = error;
}

public String getErrorMessage() {
    return errorMessage;
}

public void setErrorMessage(String errorMessage) {
    this.errorMessage = errorMessage;
}

public String getTechnicalErrorMessage() {
    return technicalErrorMessage;
}

public void setTechnicalErrorMessage(String technicalErrorMessage) {
    this.technicalErrorMessage = technicalErrorMessage;
}

public String getSuccessMessage() {
    return successMessage;
}

public void setSuccessMessage(String successMessage) {
    this.successMessage = successMessage;
}}

但我得到的结果是 ResponseEntity<LinkedTreeMap>，对象是 (Key->Value) 的映射，而不是类型 ResponseEntity<T>.

发送的实际映射对象

下图是在调试器中出现的：

Answer 1

GSON 应该如何理解，它应该使用哪个 class 代替 T 以及 "actual mapped object that send by the Type" 是什么来填充它的字段？我们在 Java 中有 type erasure 泛型，所以在运行时无法理解它 T 是什么。没办法，所以gson就用generic Map<String, String>().

看看这个question的回复，都是一样的情况。

如何从 Java 中的泛型类型反序列化 JSON 对象？

How to deserialize JSON object from generic type in Java?

java

generics

mapping

json

gson