遇到一个神奇的问题

在项目里面前端接收的一个string类型的json转换成对象的时候报错

cn.hutool.core.convert.ConvertException: No Converter for type [java.util.List]

然后不服气的我拿出来研究了一下，结果发现在新建的工程里面没有问题。这就很尴尬了。本着不不服气的精神，又研究了好久，把实体类拷出来一模一样还是报错。既然实体都一样了。猛然想起。两个工程用的hutool包版本不一致。最后把测试工程的hutool包降级版本后问题就重现。项目里hutool包 4.5.11测试工程里面5.3.10版本

记录一下，踩了这个坑

   
        String txt ="{\"logType\":4,\"beInviterPrizePoolId\":1298,\"updateCode\":\"191095846\",\"theMax4ShareReward\":\"完成本阶梯任务数量\",\"inviteRules\":[{\"helpTarget\":[{\"eventType\":\"member\",\"event\":154,\"eventBody\":[{\"branch_name\":\"分支名称\",\"event\":[{\"column_name\":\"register_area\",\"column_value\":\"110101\",\"meta_column_id\":2175,\"column_value_type\":\"field\",\"web_value\":\"{\\\"province\\\":[\\\"11\\\"],\\\"city\\\":[\\\"1101\\\"],\\\"region\\\":[\\\"110101\\\"]}\"},{\"column_name\":\"register_store_manager_code\",\"column_value\":\"C-P101-A155-M0374-B1855-DDTT01\",\"meta_column_id\":2176,\"column_value_type\":\"field\",\"column_value_ext\":{\"table_name\":\"cdp_store_imp\",\"column_name_select\":\"org_code_long\",\"column_name_where\":[\"batch_no\",\"brand_code\"],\"where_value\":[\"\",\"TS\"]},\"web_value\":\"{\\\"bigAreas\\\":\\\"C\\\",\\\"smallAreas\\\":\\\"C-P101\\\",\\\"managerAreas\\\":\\\"C-P101-A155\\\",\\\"managerCityAreas\\\":\\\"C-P101-A155-M0374\\\",\\\"operateCities\\\":\\\"\\\",\\\"storeItems\\\":\\\"C-P101-A155-M0374-B1855-DDTT01\\\",\\\"selectedStoreItems\\\":[{\\\"orgCode\\\":\\\"DDTT01\\\",\\\"orgName\\\":\\\"DDTT01-1\\\",\\\"orgCodeLong\\\":\\\"C-P101-A155-M0374-B1855-DDTT01\\\"}]}\"},{\"column_name\":\"register_time\",\"column_value\":\"@2021-08-26 00:00:00,2021-08-27 23:59:59\",\"meta_column_id\":2177,\"column_value_type\":\"field\"},{\"column_name\":\"register_source\",\"column_value\":\"offline\",\"meta_column_id\":2178,\"column_value_type\":\"enum2Filter\",\"column_value_ext\":{\"offline\":[\"03\",\"11\",\"19\",\"48\",\"27\",\"31\",\"09\",\"07\"]}}]}],\"helpTargetName\":\"助力任务描述\"}],\"countWithInviter\":true,\"finishThisLadderNum\":\"完成本阶梯任务数量\",\"thisLadderPrizePoolId\":1298,\"ladderImg\":\"https://crm-resource-test.topsports.com.cn/group1/M00/08/32/Cgn72WEKSCeAWLyyAAABS4B__A8285.png\",\"sendTimeType\":0,\"sendTimeVal\":\"\"}],\"actModel\":3,\"updateUser\":\"闫凯梦\",\"inviteType\":3,\"freezeTime\":\"2021-08-18 00:00:00\",\"beInviterCanGetMaxLimit\":\"可获得奖励次数\",\"activityId\":\"26ccc8b7c23b42669c0f795d2e4e070c\",\"sharePrizePoolId\":1298,\"logOperationType\":1}";

 ActRuleConfigDto actRuleConfigDto =  JSONUtil.toBean(txt, ActRuleConfigDto.class);
        System.out.println("======"+JSONUtil.toJsonStr(actRuleConfigDto));

查明原因，因为实体里面定义的字段theMax4ShareReward是int类型传入的是string 报了这个错。被这个报错【No Converter for type [java.util.List]】误导了。

测试工程里面 JSON.toJsonString(actRuleConfigDto) 报错了

java.lang.ClassCastException: cn.hutool.core.bean.PropDesc cannot be cast to cn.hutool.core.bean.BeanDesc$PropDesc
奇怪的时，当我搞明白版本这个问题居然不报错了 猜测还是包版本的问题。

另外推荐一个好用的json解析工具

        <dependency>
            <groupId>org.noear</groupId>
            <artifactId>snack3</artifactId>
            <version>3.1.18</version>
            <scope>provided</scope>
        </dependency>



        String jsonStr ="{\"code\":1,\"data\":{\"claimNum\":1,\"couponCodes\":[\"这是一个测试券号忽略\"],\"couponList\":[{\"couponCode\":\"这是一个测试券号忽略\",\"endTime\":\"2021-08-31 23:59:59\",\"startTime\":\"2021-08-05 00:00:00\",\"ticketPassword\":\"\",\"ticketUrl\":\"\"}],\"couponRuleCode\":\"HTDT21029679\",\"couponRuleName\":\"xxx九折优惠券051\",\"couponType\":1,\"couponTypeSub\":11,\"discType\":1,\"faceMoney\":10,\"message\":\"领取成功\",\"showFinishFlag\":0,\"vipFlag\":false},\"bizMsg\":\"成功\",\"bizCode\":20000}";
        ONode o = ONode.load(jsonStr);
        o.set("bizCode",2);
        System.out.println(o.select("$.bizCode"));
        ONode data = o.select("$.data");
        JSONObject couponInfo = new JSONObject();
        couponInfo.put("couponRuleName",data.select("$.couponRuleName").getString());
        couponInfo.put("couponMoneyType",data.select("$.discType").getString());
        couponInfo.put("couponMoney",data.select("$.faceMoney").getString());
        couponInfo.put("isretail",data.select("$.couponType").getInt());
        couponInfo.put("startTime",data.select("$.couponList[0].startTime").getString());
        couponInfo.put("endTime",data.select("$.couponList[0].endTime").getString());
        couponInfo.put("showFinishFlag",data.select("$.showFinishFlag").getInt());
        couponInfo.put("couponCode",data.select("$.couponList[0].couponCode").getString());
        System.out.println(JSON.toJSONString(couponInfo));

        System.out.println(o.get("data").get("couponList").get(0).get("couponCode"));


// string转对象

        ActRuleConfigDto  actRuleConfigDto2 = ONode.deserialize(txt,ActRuleConfigDto.class);
        System.out.println("字符串化："+ONode.stringify(actRuleConfigDto2));
        System.out.println("序列化="+ONode.serialize(actRuleConfigDto2));

上面类型不对的json用ONode 转对象的时候会报错

java.lang.RuntimeException: java.lang.NumberFormatException: For input string: "完成本阶梯任务数量"
这个就比hutool的报错友好很多！

简单的性能对比

 @Test
    public void tests(){
        String txt ="{\"logType\":4,\"beInviterPrizePoolId\":1298,\"updateCode\":\"191095846\",\"theMax4ShareReward\":3,\"inviteRules\":[{\"helpTarget\":[{\"eventType\":\"member\",\"event\":154,\"eventBody\":[{\"branch_name\":\"分支名称\",\"event\":[{\"column_name\":\"register_area\",\"column_value\":\"110101\",\"meta_column_id\":2175,\"column_value_type\":\"field\",\"web_value\":\"{\\\"province\\\":[\\\"11\\\"],\\\"city\\\":[\\\"1101\\\"],\\\"region\\\":[\\\"110101\\\"]}\"},{\"column_name\":\"register_store_manager_code\",\"column_value\":\"C-P101-A155-M0374-B1855-DDTT01\",\"meta_column_id\":2176,\"column_value_type\":\"field\",\"column_value_ext\":{\"table_name\":\"cdp_store_imp\",\"column_name_select\":\"org_code_long\",\"column_name_where\":[\"batch_no\",\"brand_code\"],\"where_value\":[\"\",\"TS\"]},\"web_value\":\"{\\\"bigAreas\\\":\\\"C\\\",\\\"smallAreas\\\":\\\"C-P101\\\",\\\"managerAreas\\\":\\\"C-P101-A155\\\",\\\"managerCityAreas\\\":\\\"C-P101-A155-M0374\\\",\\\"operateCities\\\":\\\"\\\",\\\"storeItems\\\":\\\"C-P101-A155-M0374-B1855-DDTT01\\\",\\\"selectedStoreItems\\\":[{\\\"orgCode\\\":\\\"DDTT01\\\",\\\"orgName\\\":\\\"DDTT01-1\\\",\\\"orgCodeLong\\\":\\\"C-P101-A155-M0374-B1855-DDTT01\\\"}]}\"},{\"column_name\":\"register_time\",\"column_value\":\"@2021-08-26 00:00:00,2021-08-27 23:59:59\",\"meta_column_id\":2177,\"column_value_type\":\"field\"},{\"column_name\":\"register_source\",\"column_value\":\"offline\",\"meta_column_id\":2178,\"column_value_type\":\"enum2Filter\",\"column_value_ext\":{\"offline\":[\"03\",\"11\",\"19\",\"48\",\"27\",\"31\",\"09\",\"07\"]}}]}],\"helpTargetName\":\"助力任务描述\"}],\"countWithInviter\":true,\"finishThisLadderNum\":4,\"thisLadderPrizePoolId\":1298,\"ladderImg\":\"https://crm-resource-test.topsports.com.cn/group1/M00/08/32/Cgn72WEKSCeAWLyyAAABS4B__A8285.png\",\"sendTimeType\":0,\"sendTimeVal\":\"\"}],\"actModel\":3,\"updateUser\":\"闫凯梦\",\"inviteType\":3,\"freezeTime\":\"2021-08-18 00:00:00\",\"beInviterCanGetMaxLimit\":9,\"activityId\":\"26ccc8b7c23b42669c0f795d2e4e070c\",\"sharePrizePoolId\":1298,\"logOperationType\":1}";
        long start  = System.currentTimeMillis();
        for (int i =0;i<100000;i++){
            ActRuleConfigDto  actRuleConfigDto2 = ONode.deserialize(txt,ActRuleConfigDto.class);
//           String res =ONode.stringify(actRuleConfigDto2);
        }
        long end = System.currentTimeMillis();
        System.out.println("ONode序列化耗时1="+(end-start));

        long start2  = System.currentTimeMillis();
        for (int i =0;i<100000;i++){
            ActRuleConfigDto actRuleConfigDto =  JSONUtil.toBean(txt, ActRuleConfigDto.class);
//           String res =com.alibaba.fastjson.JSONObject.toJSONString(actRuleConfigDto);
        }
        long end2 = System.currentTimeMillis();
        System.out.println("ONode序列化耗时2="+(end2-start2));
//        ONode序列化耗时1=1073
//        ONode序列化耗时2=1497

        //去掉反序列化 仅 str转对象  性能好了快一倍
//        ONode序列化耗时1=699
//        ONode序列化耗时2=1339

    }

ONode性能好了快一倍。但是对象转str的时候hutool的更快