如何使用 gson 将 json 数据转换为 java 对象？

Question

我有一个json字符串。我想将其转换为 java 对象。我的实体类是Deneme.java.

Result变量存储json字符串。我怎样才能做这个过程？

我收到一个错误：Expected BEGIN_OBJECT but was BEGIN_ARRAY

来自服务器的数据是，

 {"games":

       [   

            {"game":"Football","probability":0.74656546},

            {"game":"Football","probability":0.23432424},

            {"game":"Football","probability":0.2342342343}

       ]

 }

Deneme.java是，

import com.google.gson.JsonObject;

import org.json.JSONArray;

import java.util.List;

public class Deneme {

    private List<JsonObject> matches;

    public List<JsonObject> getMatches() {

        return matches;

    }

    public void setMatches(List<JsonObject> matches) {

        this.matches = matches;

    }

}

我的代码是：

Gson gson = new Gson();

Deneme obj = gson.fromJson(result, Deneme.class);

Answer 1

使用您当前的结构，您可以使用以下内容：&nbsp; &nbsp; public class Deneme {&nbsp; &nbsp; &nbsp; &nbsp; private List<JsonObject> games;&nbsp; &nbsp; &nbsp; &nbsp; public List<JsonObject> getMatches() {&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; return games;&nbsp; &nbsp; &nbsp; &nbsp; }&nbsp; &nbsp; &nbsp; &nbsp; public void setMatches(List<JsonObject> games) {&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; this.games = games;&nbsp; &nbsp; &nbsp; &nbsp; }&nbsp; &nbsp; }&nbsp; &nbsp; public static void main(String[] args) {&nbsp; &nbsp; &nbsp; &nbsp; Deneme deneme = new Gson().fromJson(json, Deneme.class);&nbsp; &nbsp; &nbsp; &nbsp; deneme.getMatches().forEach(System.out::println);&nbsp; &nbsp; }您应该更改private List<JsonObject> matches为private List<JsonObject> games.输出是：{"game":"Football","probability":0.74656546}{"game":"Football","probability":0.23432424}{"game":"Football","probability":0.2342342343}我认为在你的情况下，在你的类中创建类Game和存储Game对象列表可能会更好Deneme，因为现在你只是存储JsonObject's.

Answer 2

当您转换为时，您需要具有相同的名称Deneme改变，private&nbsp;List<JsonObject>&nbsp;matches;至，private List<JsonObject> games;