在 JAVA 中的 JSON 反序列化期间更改两个字段名称

Question

我有一个 json 文件

{"apple" : [
        {
            "first"    : 3,
            "second"    : 5,

        }
      ],
"orange" : [
        {
            "fst"    : 7,
            "snd"    : 8,

        }
      ],
}

反序列化的辅助类

public class Helper {

    private int num1;

    private int num2;

    public Helper(Helper other) {
        this.num1 = other.num1;
        this.num2 = other.num2;
    }

    public int getNum1() {
        return this.num1;
    }

    public int getNum2() {
        return this.num2;
    }
}

一个用于反序列化的 java 类，我需要将其 JSON 键更改为与 Helper 类的实例名称兼容。

public class MyDesClass {

    @SerializedName(value = "apple.first", alternate = "apple.num1")
    @SerializedName(value = "apple.seconds", alternate = "apple.num2")
    private final Helper[] apple;

    public MyDesClass(Helper[] apple) {
        this.apple = apple;
    }
    
}          

而且，在 main.java 中我也有：

/* .... */
        Reader f = new FileReader( PATH_TO_THE_JSON_FILE);
        Gson gson = new Gson();
        GameBoard gameBoard = gson.fromJson(f, MyDesClass.class);
/* .... */

我的问题是如何在MyDesClass 中同时转换两个值（例如first 和second）（例如此处为num1 和num2）？目前，我收到SerializedName is not a repeatable annotation type 错误。

Answer 1

您需要在 Helper 类中使用 @SerializedName（如果需要，请更新 MyDesClass）：

public class Helper {

    @SerializedName(value = "first" alternate={"num1","fst"})
    private int num1;

    @SerializedName(value = "second" alternate={"num2","snd"})
    private int num2;

    public Helper(Helper other) {
        this.num1 = other.num1;
        this.num2 = other.num2;
    }

    public int getNum1() {
        return this.num1;
    }

    public int getNum2() {
        return this.num2;
    }
}

---

为了符合更新的JSON，MyDesClass需要有另一个字段orange：

public class MyDesClass {

    @SerializedName("apple")
    private final Helper[] apple;

    @SerializedName("orange")
    private final Helper[] orange;

    public MyDesClass(Helper[] apple, Helper[] orange) {
        this.apple = apple;
        this.orange = orange;
    }
// ...    
}