如何在Java中将JSON字符串转换为JSON对象(Gson)？

Question

我正在使用一个外部API，它的响应体是一个JSON格式的字符串。我使用Gson将字符串解析为JSON对象。但是，当试图在浏览器中显示对象时，我会得到以下错误。

SyntaxError: JSON.parse: JSON数据第1列中的意外字符

这是我的代码：

控制器

    @RequestMapping("/player")
public JsonArray displayPlayer() throws Exception{


    String player = "PacSnackz";

    smite.createSession();

    String test = smite.getPlayer(player);

    JsonArray playerObj = new JsonParser().parse(test).getAsJsonArray();

    return playerObj;

}

Smite类

      public String getPlayer(String player) throws Exception {
        if (!isSessionValid() && !createSession()) return "session null";
        return getURL(combine(new String[] {
                baseURL + "getplayer" + responseFormat,
                devID,
                getSignature("getplayer"),
                sessionID,
                getTimestamp(),
                player
        }, "/"));
}

这就是JSON字符串的样子：

JSON字符串

[{"Avatar_URL":"","Created_Datetime":"8\/16\/2016 4:30:14 AM","Id":9993055,"Last_Login_Datetime":"4\/23\/2018 8:47:56 PM","Leaves":3,"Level":17,"Losses":19,"MasteryLevel":1,"Name":"PacSnackz","Personal_Status_Message":"","Rank_Stat_Conquest":0,"Rank_Stat_Duel":0,"Rank_Stat_Joust":0,"RankedConquest":{"Leaves":0,"Losses":0,"Name":"League","Points":0,"PrevRank":0,"Rank":0,"Rank_Stat_Conquest":null,"Rank_Stat_Duel":null,"Rank_Stat_Joust":null,"Season":0,"Tier":0,"Trend":0,"Wins":0,"player_id":null,"ret_msg":null},"RankedDuel":{"Leaves":0,"Losses":0,"Name":"Duel","Points":0,"PrevRank":0,"Rank":0,"Rank_Stat_Conquest":null,"Rank_Stat_Duel":null,"Rank_Stat_Joust":null,"Season":0,"Tier":0,"Trend":0,"Wins":0,"player_id":null,"ret_msg":null},"RankedJoust":{"Leaves":0,"Losses":0,"Name":"Joust","Points":0,"PrevRank":0,"Rank":0,"Rank_Stat_Conquest":null,"Rank_Stat_Duel":null,"Rank_Stat_Joust":null,"Season":0,"Tier":0,"Trend":0,"Wins":0,"player_id":null,"ret_msg":null},"Region":"North America","TeamId":0,"Team_Name":"","Tier_Conquest":0,"Tier_Duel":0,"Tier_Joust":0,"Total_Achievements":28,"Total_Worshippers":510,"Wins":35,"ret_msg":null}]

我正在使用和Google的Gson库。我也在没有运气的情况下调查过杰克逊。

Answer 1

我想出了答案。诀窍是把玩家设置成一个数组。对于其他对象，我使用For循环返回多个对象。对于这个例子，它被设置为0，因为只有一个播放器。

@RequestMapping("/player")
public Player displayPlayer() throws Exception{


    String player = "PacSnackz";

    smite.createSession();

    String test = smite.getPlayer(player);

    Gson gson = new Gson();

    Player[] playerObj = gson.fromJson(test, Player[].class);

    return playerObj[0];



}