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com.alibaba.fastjson.JSONException: not close json text, token : error

article 2024/11/30 6:30:25

今天遇到一个相当智障的问题，前端传参数到后端，后端直接报json解析错误，not close？？听着就很奇怪，关键有的时候正常，有的时候不正常。于是先在浏览器中F12，看传的参数感觉没问题，在后端filter中获得request的body，打印出来，很长，也看不出来问题。
1、先来看一下用以接收参数的dto

@Data
public class DeliveryFeeProcessDTO extends TDeliveryFeeProcessRecord {

    /**
     * 货物明细
     */
    private List<TDeliveryFeeProcessGoodsInfo> goodsList;

    /**
     * 文件列表
     */
    private List<FileInfo> fileList;

    /**
     * 1 通过
     * 0 驳回
     */
    private Integer state;
}

项目中配置的是fastjson，1.2.83

  http:
    converters:
      preferred-json-mapper: fastjson       # Json转换器


        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>fastjson</artifactId>
            <version>1.2.83</version>
        </dependency>

可以看到有两个list 比较可疑··
2、看一下我精简后的json 字符串，这也能报错？

{"creatorId": "superadmin","goodsList": "","fileList": ""}

3、写一个demo

public static void main(String[] args) {
//        String json = "{\"creatorId\": \"superadmin\",\"goodsList\": \"\",\"fileList\": []}";
        dealJson("{\"creatorId\": \"superadmin\",\"goodsList\": \"\"}");
        dealJson("{\"creatorId\": \"superadmin\",\"fileList\": \"\"}");
        dealJson("{\"creatorId\": \"superadmin\",\"goodsList\": []}");
        dealJson("{\"creatorId\": \"superadmin\",\"fileList\": []}");
        dealJson("{\"creatorId\": \"superadmin\",\"goodsList\": \"\",\"fileList\": []}");
        dealJson("{\"creatorId\": \"superadmin\",\"goodsList\": \"\",\"fileList\": \"\"}");
        dealJson("{\"creatorId\": \"superadmin\",\"goodsList\": [],\"fileList\": []}");
        dealJson("{\"creatorId\": \"superadmin\",\"goodsList\": [],\"fileList\": \"\"}");
    }

    private static void dealJson(String json) {
        Boolean flag = true;
        try {
            DeliveryFeeProcessDTO dto = JSONObject.parseObject(json, DeliveryFeeProcessDTO.class);
        }catch (Exception e){
            flag = false;
//            System.out.println(json);
            System.out.println(e.getMessage());
//            e.printStackTrace();
        }
        if(flag){
            System.out.println("PASS"+json);
        }else {
            System.out.println("FAILED"+json);
        }
    }

出来的结果是

FAILED{"creatorId": "superadmin","goodsList": ""}
FAILED{"creatorId": "superadmin","fileList": ""}
PASS{"creatorId": "superadmin","goodsList": []}
PASS{"creatorId": "superadmin","fileList": []}
FAILED{"creatorId": "superadmin","goodsList": "","fileList": []}
FAILED{"creatorId": "superadmin","goodsList": "","fileList": ""}
PASS{"creatorId": "superadmin","goodsList": [],"fileList": []}
PASS{"creatorId": "superadmin","goodsList": [],"fileList": ""}

可以看到，应该是因为List不能是空字符串，必须是空数组才行
但是最后一个就很鬼畜了！！竟然PASS了！

好了，省流（我懒得去翻fastjson的源码，更懒得去看fastjson的release note）。解决办法是升级····简单粗暴。在maven仓库中查到最新是2.0.53

        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>fastjson</artifactId>
            <version>2.0.53</version>
        </dependency>