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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>

所以，每当你以为自己技术还行的时候，就会在小坑里栽跟头