rabbitMq消息接收转换对象，Json解析字符串报错syntax error, expect {, actual string, pos 0, fastjson

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rabbitMq消息接收转换对象，Json解析字符串报错syntax error, expect {, actual string, pos 0, fastjson

代码语言：javascript代码运行次数：0运行复制

Expected BEGIN_OBJECT but was STRING at line 1 column 2 path $

代码语言：javascript代码运行次数：0运行复制

syntax error, expect {, actual string, pos 0, fastjson-version 1.2.62

代码语言：javascript代码运行次数：0运行复制

syntax error, expect {, actual string, pos 0, fastjson-version 1.2.62

以上的报错都是Json字符串格式错误，比如缺少{}，比如两头多了”“,或者转义字符\"，比如在映射的对象错误，本来是List，但是写成了String，或者是单个对象，而不是List，都会报错。
1.在本地运行main方法排查解决
2.如果是多了”“，或者是内部多了转义字符\"，则使用简单的替换方法。

比如完整的Json字符串格式如下：

{"err_no":"0","err_tips":"success","data":{"refund_list":[{"refund_id":"ots7240038790928135","out_refund_no":"29160417157000010","refund_total_amount":1090,"refund_status":"PROCESSING","refund_at":0,"message":"","order_id":"ots72396406088135","item_order_detail":[{"item_order_id":"ots723969678768135","refund_amount":1090}],"merchant_audit_detail":"{\"deny_message\":\"\",\"need_refund_audit\":1,\"refund_audit_deadline\":16859682,\"audit_status\":\"TOAUDIT\"}","create_at":1685701000,"refund_source":2}],"refund_id":"ots72400387928135","out_refund_no":"2916041715168561000010","refund_total_amount":1090,"refund_status":"PROCESSING","refund_at":0,"message":"","order_id":"ots7239640656088135","item_order_detail":[{"item_order_id":"ots72396406578768135","refund_amount":1090}],"merchant_audit_detail":{"need_refund_audit":1,"refund_audit_deadline":168596282,"audit_status":"TOAUDIT","deny_message":""}}}

代码语言：javascript代码运行次数：0运行复制

package com.example.core.mydemo.json2;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONObject;
import com.google.gson.reflect.TypeToken;

public class JSONTest {
    public static void main(String[] args) {
        String msg = "\"orderNo\":\"50133310603299\",\"riskAccidentStatus\":\"1\",\"operator\":\"admin\"";
        //Expected BEGIN_OBJECT but was STRING at line 1 column 2 path $
        //缺少的是{}
        try {
            MQReceiveCLevelRiskControlDTO cLevelRiskControlDTO = GsonUtils.convert(msg, new TypeToken<MQReceiveCLevelRiskControlDTO>() {});
            System.out.println("gson1=" + GsonUtils.toJson(cLevelRiskControlDTO));
        }catch (Exception e) {
            MQReceiveCLevelRiskControlDTO cLevelRiskControlDTO = GsonUtils.convert("{"+msg+"}", new TypeToken<MQReceiveCLevelRiskControlDTO>() {});
            System.out.println("gson2=" + GsonUtils.toJson(cLevelRiskControlDTO));
        }

        //syntax error, expect {, actual string, pos 0, fastjson-version 1.2.62
//        MQReceiveCLevelRiskControlDTO cLevelRiskControlDTO2 = JSON.parseObject(msg, MQReceiveCLevelRiskControlDTO.class);
//        System.out.println("gson2=" + GsonUtils.toJson(cLevelRiskControlDTO2));

        //syntax error, expect {, actual string, pos 0, fastjson-version 1.2.62
//        MQReceiveCLevelRiskControlDTO cLevelRiskControlDTO3 = JSONObject.parseObject(msg, MQReceiveCLevelRiskControlDTO.class);
//        System.out.println("gson3=" + GsonUtils.toJson(cLevelRiskControlDTO3));


    }
}

 解决方法:过滤json字符串格式

代码语言：javascript代码运行次数：0运行复制

String msgNew = msg;
if(msg.startsWith("\"") && msg.endsWith("\"")){
    msgNew = msg.substring(1,msg.length() - 1).replace("\\","");
}

代码语言：javascript代码运行次数：0运行复制

本文参与 腾讯云自媒体同步曝光计划，分享自作者个人站点/博客。 原始发表：2023-06-05，如有侵权请联系 cloudcommunity@tencent 删除前往查看expectstringsyntax对象字符串

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