SpringMvc返回JSON出现"$.result.currentLevel"

“$.result.currentLevel”

问题描述

使用SpringMvc返回一个json数据的时候，会在产生的结果中出现如下的问题：”$.result.currentLevel”

{
    "code": 200,
    "msg": "请求成功",
    "result": {
            "currentLevel": {
            "code": "20180417543114",
            "createDate": 1526528076000,
            "growup": 600,
            "icon": "http://192.168.1.128:8080/pic/level-3.png",
            "id": "31feff3a04c84ade99287f862bcfaa9b",
            "isSys": "0",
            "levelName": "王者会员",
            "levelNum": 4,
            "rebate": 5,
            "setid": "c7a29d3f58ea4c6588a471f02fb32cd4",
            "sort": 2
        },
        "maxLevel": {
            "$ref": "$.result.currentLevel"
        },

    }
}

问题原因

由于被转换为json的对象存在引用

java代码：

            MembersysLevel entity = new MembersysLevel();
            entity.setCode();

            List<MembersysLevel> membersysLevelList = membersysSetService.getLevels(entity);

            MembersysLevel currentLevel = new MembersysLevel();
            int currentLevelIndex = 0;

            for (int i = 0, size = membersysLevelList.size(); i < size; i++) {
                MembersysLevel membersysLevel = membersysLevelList.get(i);

                if (resultBqUsers.getLevelId().equals(membersysLevel.getId())) {
                    //
                    currentLevel = membersysLevel;
                    currentLevelIndex = i;
                    break;
                }
            }

            int maxLevelIndex = membersysLevelList.size() - 1;
            MembersysLevel maxLevel = membersysLevelList.get(maxLevelIndex);




            //上一个 
            MembersysLevel preMembersysLevel = new MembersysLevel();

            // 
            if (currentLevelIndex + 1 < membersysLevelList.size()) {
                preMembersysLevel = membersysLevelList.get(currentLevelIndex + 1);
            }

 return ResultBean.success()
                    .setResult("currentLevel", currentLevel)
                    .setResult("maxLevel", maxLevel)
                    .setResult("preMembersysLevel", preMembersysLevel)
                    .setResult("bqUsers", resultBqUsers);

解决的办法

将被引用的对象复制到一个新的地址，然后再去转换为json。即可
在上述代码中，会出现 maxLevel == currentLevel 这种现象，所以在最后就会出现json串的错误现象。我们可以通过java对象克隆的方式来进行解决。

  MembersysLevel cloneMaxLevel = null;

            if (maxLevel == currentLevel) {
                //如果相等 那么clone
                cloneMaxLevel = (MembersysLevel) currentLevel.clone();
            }

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