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JSON工具-JSONUtil (hutool.cn)

报错内容

Caused by: cn.hutool.json.JSONException: Expected a ':' after a key at 5 [character 6 line 1]
at cn.hutool.json.JSONTokener.syntaxError(JSONTokener.java:396)
at cn.hutool.json.JSONParser.parseTo(JSONParser.java:69)
at cn.hutool.json.ObjectMapper.mapFromTokener(ObjectMapper.java:239)
at cn.hutool.json.ObjectMapper.mapFromStr(ObjectMapper.java:215)
at cn.hutool.json.ObjectMapper.map(ObjectMapper.java:98)
at cn.hutool.json.JSONObject.<init>(JSONObject.java:210)
at cn.hutool.json.JSONObject.<init>(JSONObject.java:187)
at cn.hutool.json.JSONObject.<init>(JSONObject.java:142)
at cn.hutool.json.JSONObject.<init>(JSONObject.java:125)
at cn.hutool.json.JSONUtil.parseObj(JSONUtil.java:87)
at com.consumer.handler.ConsumerHandler.exec(ConsumerHandler.java:219)
at com.consumer.handler.ConsumerHandler$$FastClassBySpringCGLIB$$9d1a3921.invoke(<generated>)
at org.springframework.cglib.proxy.MethodProxy.invoke(MethodProxy.java:218)
at org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.invokeJoinpoint(CglibAopProxy.java:793)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:163)
at org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.proceed(CglibAopProxy.java:763)
at org.springframework.transaction.interceptor.TransactionInterceptor$1.proceedWithInvocation(TransactionInterceptor.java:123)
at org.springframework.transaction.interceptor.TransactionAspectSupport.invokeWithinTransaction(TransactionAspectSupport.java:388)
at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:119)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186)
at org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.proceed(CglibAopProxy.java:763)
at org.springframework.aop.framework.CglibAopProxy$DynamicAdvisedInterceptor.intercept(CglibAopProxy.java:708)
at com.consumer.handler.ConsumerHandler$$EnhancerBySpringCGLIB$$b5b69bdb.exec(<generated>)
at com.consumer.Consumer.lambda$download$0(DownloadConsumer.java:39)
at org.springframework.cloud.function.context.catalog.SimpleFunctionRegistry$FunctionInvocationWrapper.invokeConsumer(SimpleFunctionRegistry.java:1007)
at org.springframework.cloud.function.context.catalog.SimpleFunctionRegistry$FunctionInvocationWrapper.doApply(SimpleFunctionRegistry.java:742)
at org.springframework.cloud.function.context.catalog.SimpleFunctionRegistry$FunctionInvocationWrapper.apply(SimpleFunctionRegistry.java:588)
at org.springframework.cloud.stream.function.PartitionAwareFunctionWrapper.apply(PartitionAwareFunctionWrapper.java:84)
at org.springframework.cloud.stream.function.FunctionConfiguration$FunctionWrapper.apply(FunctionConfiguration.java:791)
at org.springframework.cloud.stream.function.FunctionConfiguration$FunctionToDestinationBinder$1.handleMessageInternal(FunctionConfiguration.java:623)
at org.springframework.integration.handler.AbstractMessageHandler.handleMessage(AbstractMessageHandler.java:56)
... 24 common frames omitted

问题定位

分析上述报错信息，可以定位出问题所在

Caused by: cn.hutool.json.JSONException: Expected a ':' after a key at 5 [character 6 line 1]

Hutool.JSONUtil工具类字符串解析报错

at com.consumer.handler.ConsumerHandler.exec(ConsumerHandler.java:219)

ConsumerHandler.java代码第219行

打开代码文件

String msg = JSONUtil.parseObj(result).getStr("msg")

可以看见第219行是获取result里面的msg信息，往上翻代码，找到result赋值的地方

Object resultObj = remoteService.checkParam(JSONUtil.toJsonStr(mapParam));
String result = resultObj.toString();

首先，可以明确，JSONUtil.parseObj()方法，参数可以是Object，也可以是String

    // JSONUtil.class

    public static JSONObject parseObj(String jsonStr) {
        return new JSONObject(jsonStr);
    }

    public static JSONObject parseObj(Object obj) {
        return parseObj(obj, (JSONConfig)null);
    }

那么为什么会解析失败呢，问题大概率出在

resultObj.toString()

，打印日志，进入调试模式

Object resultObj = remoteService.checkParam(JSONUtil.toJsonStr(mapParam));
String result = resultObj.toString();
log.info(result);

控制台打印输出

{msg=执行成功, code=200}

找到问题了

toString会导致

:

变成

=


解决方案

Object resultObj = remoteService.checkParam(JSONUtil.toJsonStr(mapParam));
String result = JSONUtil.toJsonStr(resultObj);

使用

JSONUtil.toJsonStr


可以将任意对象（Bean、Map、集合等）直接转换为JSON字符串。 如果对象是有序的Map等对象，则转换后的JSON字符串也是有序的。