解决Post请求JSON列表参数格式报错：JSON parse error: Cannot deserialize value of type `java.util.ArrayList＜x＞

问题描述

今天在调试接口的时候，遇到一个问题。有一个post请求的json body参数，

然后vo里面只有两个属性，id和一个集合。

然后使用apifox调试接口的时候，发现json解析异常：

操作失败，JSON parse error: Cannot deserialize value of type `java.util.ArrayList` from Object value (token `JsonToken.START_OBJECT`);

通过提示信息，可以发现是因为json结构不对导致解析不了。

错误示范

我原来是这样传的，会报错：

{"id": "403","x": {"serialVersionUID": 1,"id": 1,"fileCode": "demoData","fileName": "demoData","fileNum": 1,"fileSize": "demoData","fileCategoryDic": 1,"fileTypeDic": 1,"allowType": "demoData","izRequired": 1,"fileDesc": "demoData","templateUrl": "demoData","handleUrl": "demoData","delFlag": 1,"createBy": "demoData","createTime": "2023-05-09 09:45:36","updateBy": "demoData","updateTime": "2023-05-09 09:45:36","remark": "demoData","tenantId": "demoData","flag": true,"quyang": "demoData"}}

正确示范

应该给list加一层数组，这样就能正常解析

{"id": "403","sysConfigFiles": [{"serialVersionUID": 1,"id": 1,"fileCode": "demoData","fileName": "demoData","fileNum": 1,"fileSize": "demoData","fileCategoryDic": 1,"fileTypeDic": 1,"allowType": "demoData","izRequired": 1,"fileDesc": "demoData","templateUrl": "demoData","handleUrl": "demoData","delFlag": 1,"createBy": "demoData","createTime": "2023-05-09 09:45:36","updateBy": "demoData","updateTime": "2023-05-09 09:45:36","remark": "demoData","tenantId": "demoData","flag": true,"quyang": "demoData"}]}

扩展，多个集合元素

如果有多个集合，那么直接使用,分割即可，例如：

{"id": "403","sysConfigFiles": [{"serialVersionUID": 1,"id": 1,"fileCode": "demoData","fileName": "demoData","fileNum": 1,"fileSize": "demoData","fileCategoryDic": 1,"fileTypeDic": 1,"allowType": "demoData","izRequired": 1,"fileDesc": "demoData","templateUrl": "demoData","handleUrl": "demoData","delFlag": 1,"createBy": "demoData","createTime": "2023-05-09 09:45:36","updateBy": "demoData","updateTime": "2023-05-09 09:45:36","remark": "demoData","tenantId": "demoData","flag": true,"quyang": "demoData"},{"serialVersionUID": 1,"id": 1,"fileCode": "demoData","fileName": "demoData","fileNum": 1,"fileSize": "demoData","fileCategoryDic": 1,"fileTypeDic": 1,"allowType": "demoData","izRequired": 1,"fileDesc": "demoData","templateUrl": "demoData","handleUrl": "demoData","delFlag": 1,"createBy": "demoData","createTime": "2023-05-09 09:45:36","updateBy": "demoData","updateTime": "2023-05-09 09:45:36","remark": "demoData","tenantId": "demoData","flag": true,"quyang": "demoData"}]}