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＞

你的名字 2023-09-27 20:21 84阅读 0赞

## 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，

![在这里插入图片描述][70b5ee2a8c5641dd8f734dccc739a12c.png]

然后vo里面只有两个属性，id和一个集合。

![在这里插入图片描述][ad981ee2b9f544f5a98ffe75eed53a8c.png]

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<org.jeecg.file.entity.SysConfigFile>` from Object value (token `JsonToken.START_OBJECT`);

![在这里插入图片描述][584d776bcfe34cd287ca9c9aaad2a272.png]

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

## 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"
      }
      ]
    }

[70b5ee2a8c5641dd8f734dccc739a12c.png]: https://img-blog.csdnimg.cn/70b5ee2a8c5641dd8f734dccc739a12c.png
[ad981ee2b9f544f5a98ffe75eed53a8c.png]: https://img-blog.csdnimg.cn/ad981ee2b9f544f5a98ffe75eed53a8c.png
[584d776bcfe34cd287ca9c9aaad2a272.png]: https://img-blog.csdnimg.cn/584d776bcfe34cd287ca9c9aaad2a272.png

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＞

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