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来自RESTful请求的JSON解析异常

分类: 技术问答 • 2022-09-18 18:29:02
问题描述：

我的应用程序正在向RESTful服务请求发送到外部源。外部来源返回JSON数据。不过，我得到这个异常：来自RESTful请求的JSON解析异常

“com.fasterxml.jackson.databind.JsonMappingException：无效的UTF-8 起始字节0XA0。”

我的Java代码，使RESTful要求如下： `

HttpSession httpSession = new HttpSession(); 
httpSession.createHeaders(); 
httpSession.setupMessageConverters(); 
restTemplate.setMessageConverters(httpSession.getMessageConverterList()); 
ResponseEntity<JsonData> responseEntity = restTemplate.exchange(URLConstants.GET_CUSTOM_EVENTS, HttpMethod.GET, httpSession.getHttpEntity(), JsonData.class);

我有一些代码控制HTTP标头和反序列化设置如下：

public void createHeaders(){ 
    HttpHeaders httpHeaders = new HttpHeaders(); 
    httpHeaders.setAccept(Arrays.asList(MediaType.APPLICATION_JSON)); 

    HttpEntity<String> httpEntity = new HttpEntity<String>(httpHeaders); 
    this.httpEntity = httpEntity; 

    this.httpHeaders = httpHeaders; 
}  

public void setupMessageConverters(){ 
    List<HttpMessageConverter<?>> messageConverterList = new ArrayList<>(); 
    MappingJackson2HttpMessageConverter messageConverter = new MappingJackson2HttpMessageConverter(); 
    ObjectMapper objectMapper = new ObjectMapper(); 
    objectMapper.enable(DeserializationFeature.ACCEPT_SINGLE_VALUE_AS_ARRAY, DeserializationFeature.ACCEPT_EMPTY_STRING_AS_NULL_OBJECT); 
    messageConverter.setObjectMapper(objectMapper); 
    messageConverterList.add(messageConverter); 

    this.messageConverterList = messageConverterList; 
}

似乎导致错误的JSON行是这样的（如在Web方法的Swagger UI中所见）：

{ 
 
    "object_id": 5, 
 
    "web_method_rest1": " /rest/information/5", 
 
    "custom_event_type": "save" 
 
}

看来，编码/解码未在JSON数据的值喜欢前导空间。堆栈跟踪显示导致错误的JSON变量为web_method_rest1。有什么方法可以改变JSON数据的编码方式，从而允许前导空格，比如反序列化设置或我可以添加到HTTP标头的东西？由于JSON数据是从外部来的，我不能轻松控制这些数据。

任何帮助你可以提供这个将不胜感激，即使有某种文件，我可以指出。

下面是一个更完整的栈跟踪：

org.springframework.http.converter.HttpMessageNotReadableException: Could not read JSON document: Invalid UTF-8 start byte 0xa0 
at [Source: [email protected]; line: 8, column: 31] 
at [Source: [email protected]; line: 8, column: 29] (through reference chain: com.foo.bar.webclient.model.rest.JsonData["CustomEvents"]->com.foo.bar.webclient.model.rest.CustomEventResult["CustomEvent"]->java.util.ArrayList[0]->com.foo.bar.webclient.model.rest.CustomEvent["web_method_rest1"]); nested exception is com.fasterxml.jackson.databind.JsonMappingException: Invalid UTF-8 start byte 0xa0 
at [Source: [email protected]; line: 8, column: 31] 
at [Source: [email protected]; line: 8, column: 29] (through reference chain: com.foo.bar.webclient.model.rest.JsonData["CustomEvents"]->com.foo.bar.webclient.model.rest.CustomEventResult["CustomEvent"]->java.util.ArrayList[0]->com.foo.bar.webclient.model.rest.CustomEvent["web_method_rest1"]) 
    at org.springframework.http.converter.json.AbstractJackson2HttpMessageConverter.readJavaType(AbstractJackson2HttpMessageConverter.java:234) 
    at org.springframework.http.converter.json.AbstractJackson2HttpMessageConverter.read(AbstractJackson2HttpMessageConverter.java:219) 
    at org.springframework.web.client.HttpMessageConverterExtractor.extractData(HttpMessageConverterExtractor.java:95) 
    at org.springframework.web.client.RestTemplate$ResponseEntityResponseExtractor.extractData(RestTemplate.java:917) 
    at org.springframework.web.client.RestTemplate$ResponseEntityResponseExtractor.extractData(RestTemplate.java:901) 
    at org.springframework.web.client.RestTemplate.doExecute(RestTemplate.java:655) 
    at org.springframework.web.client.RestTemplate.execute(RestTemplate.java:613) 
    at org.springframework.web.client.RestTemplate.exchange(RestTemplate.java:531) 
    at com.foo.bar.webclient.rest.clients.RestfulRequests.getCustomEvents(RestfulRequests.java:58) 
    at com.foo.bar.webclient.rest.clients.RestfulRequests$$FastClassBySpringCGLIB$$a04c852c.invoke(<generated>) 
    at org.springframework.cglib.proxy.MethodProxy.invoke(MethodProxy.java:204) 
    at org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.invokeJoinpoint(CglibAopProxy.java:738) 
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:157) 
    at org.springframework.retry.interceptor.RetryOperationsInterceptor$1.doWithRetry(RetryOperationsInterceptor.java:91) 
    at org.springframework.retry.support.RetryTemplate.doExecute(RetryTemplate.java:286) 
    at org.springframework.retry.support.RetryTemplate.execute(RetryTemplate.java:163) 
    at org.springframework.retry.interceptor.RetryOperationsInterceptor.invoke(RetryOperationsInterceptor.java:118) 
    at org.springframework.retry.annotation.AnnotationAwareRetryOperationsInterceptor.invoke(AnnotationAwareRetryOperationsInterceptor.java:152) 
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179) 
    at org.springframework.aop.framework.CglibAopProxy$DynamicAdvisedInterceptor.intercept(CglibAopProxy.java:673) 
    at com.foo.bar.webclient.rest.clients.RestfulRequests$$EnhancerBySpringCGLIB$$d3b75a44.getCustomEvents(<generated>) 
    at com.foo.bar.webclient.batch.CustomEventReader.read(CustomEventReader.java:30) 
    at com.foo.bar.webclient.batch.CustomEventReader.read(CustomEventReader.java:1) 
    at org.springframework.batch.core.step.item.SimpleChunkProvider.doRead(SimpleChunkProvider.java:91) 
    at org.springframework.batch.core.step.item.FaultTolerantChunkProvider.read(FaultTolerantChunkProvider.java:87) 
    at org.springframework.batch.core.step.item.SimpleChunkProvider$1.doInIteration(SimpleChunkProvider.java:116) 
    at org.springframework.batch.repeat.support.RepeatTemplate.getNextResult(RepeatTemplate.java:374) 
    at org.springframework.batch.repeat.support.RepeatTemplate.executeInternal(RepeatTemplate.java:215) 
    at org.springframework.batch.repeat.support.RepeatTemplate.iterate(RepeatTemplate.java:144) 
    at org.springframework.batch.core.step.item.SimpleChunkProvider.provide(SimpleChunkProvider.java:110) 
    at org.springframework.batch.core.step.item.ChunkOrientedTasklet.execute(ChunkOrientedTasklet.java:69) 
    at org.springframework.batch.core.step.tasklet.TaskletStep$ChunkTransactionCallback.doInTransaction(TaskletStep.java:406) 
    at org.springframework.batch.core.step.tasklet.TaskletStep$ChunkTransactionCallback.doInTransaction(TaskletStep.java:330) 
    at org.springframework.transaction.support.TransactionTemplate.execute(TransactionTemplate.java:133) 
    at org.springframework.batch.core.step.tasklet.TaskletStep$2.doInChunkContext(TaskletStep.java:271) 
    at org.springframework.batch.core.scope.context.StepContextRepeatCallback.doInIteration(StepContextRepeatCallback.java:81) 
    at org.springframework.batch.repeat.support.RepeatTemplate.getNextResult(RepeatTemplate.java:374) 
    at org.springframework.batch.repeat.support.RepeatTemplate.executeInternal(RepeatTemplate.java:215) 
    at org.springframework.batch.repeat.support.RepeatTemplate.iterate(RepeatTemplate.java:144) 
    at org.springframework.batch.core.step.tasklet.TaskletStep.doExecute(TaskletStep.java:257) 
    at org.springframework.batch.core.step.AbstractStep.execute(AbstractStep.java:200) 
    at org.springframework.batch.core.job.SimpleStepHandler.handleStep(SimpleStepHandler.java:148) 
    at org.springframework.batch.core.job.AbstractJob.handleStep(AbstractJob.java:392) 
    at org.springframework.batch.core.job.SimpleJob.doExecute(SimpleJob.java:135) 
    at org.springframework.batch.core.job.AbstractJob.execute(AbstractJob.java:306) 
    at org.springframework.batch.core.launch.support.SimpleJobLauncher$1.run(SimpleJobLauncher.java:135) 
    at org.springframework.core.task.SyncTaskExecutor.execute(SyncTaskExecutor.java:50) 
    at org.springframework.batch.core.launch.support.SimpleJobLauncher.run(SimpleJobLauncher.java:128) 
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) 
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) 
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) 
    at java.lang.reflect.Method.invoke(Method.java:498) 
    at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:333) 
    at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:190) 
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:157) 
    at org.springframework.batch.core.configuration.annotation.SimpleBatchConfiguration$PassthruAdvice.invoke(SimpleBatchConfiguration.java:127) 
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179) 
    at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:213) 
    at com.sun.proxy.$Proxy67.run(Unknown Source) 
    at org.springframework.boot.autoconfigure.batch.JobLauncherCommandLineRunner.execute(JobLauncherCommandLineRunner.java:214) 
    at org.springframework.boot.autoconfigure.batch.JobLauncherCommandLineRunner.executeLocalJobs(JobLauncherCommandLineRunner.java:231) 
    at org.springframework.boot.autoconfigure.batch.JobLauncherCommandLineRunner.launchJobFromProperties(JobLauncherCommandLineRunner.java:123) 
    at org.springframework.boot.autoconfigure.batch.JobLauncherCommandLineRunner.run(JobLauncherCommandLineRunner.java:117) 
    at org.springframework.boot.SpringApplication.callRunner(SpringApplication.java:776) 
    at org.springframework.boot.SpringApplication.callRunners(SpringApplication.java:760) 
    at org.springframework.boot.SpringApplication.afterRefresh(SpringApplication.java:747) 
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:315) 
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:1162) 
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:1151) 
    at com.foo.bar.webclient.MyApplication.main(MyApplication.java:10) 
Caused by: com.fasterxml.jackson.databind.JsonMappingException: Invalid UTF-8 start byte 0xa0 
at [Source: [email protected]; line: 8, column: 31] 
at [Source: [email protected]; line: 8, column: 29] (through reference chain: com.foo.bar.webclient.model.rest.JsonData["CustomEvents"]->com.foo.bar.webclient.model.rest.CustomEventResult["CustomEvent"]->java.util.ArrayList[0]->com.foo.bar.webclient.model.rest.CustomEvent["web_method_rest1"]) 
    at com.fasterxml.jackson.databind.JsonMappingException.wrapWithPath(JsonMappingException.java:388) 
    at com.fasterxml.jackson.databind.JsonMappingException.wrapWithPath(JsonMappingException.java:348) 
    at com.fasterxml.jackson.databind.deser.BeanDeserializerBase.wrapAndThrow(BeanDeserializerBase.java:1600) 
    at com.fasterxml.jackson.databind.deser.BeanDeserializer.vanillaDeserialize(BeanDeserializer.java:278) 
    at com.fasterxml.jackson.databind.deser.BeanDeserializer.deserialize(BeanDeserializer.java:140) 
    at com.fasterxml.jackson.databind.deser.std.CollectionDeserializer.deserialize(CollectionDeserializer.java:287) 
    at com.fasterxml.jackson.databind.deser.std.CollectionDeserializer.deserialize(CollectionDeserializer.java:259) 
    at com.fasterxml.jackson.databind.deser.std.CollectionDeserializer.deserialize(CollectionDeserializer.java:26) 
    at com.fasterxml.jackson.databind.deser.SettableBeanProperty.deserialize(SettableBeanProperty.java:504) 
    at com.fasterxml.jackson.databind.deser.impl.MethodProperty.deserializeAndSet(MethodProperty.java:104) 
    at com.fasterxml.jackson.databind.deser.BeanDeserializer.vanillaDeserialize(BeanDeserializer.java:276) 
    at com.fasterxml.jackson.databind.deser.BeanDeserializer.deserialize(BeanDeserializer.java:140) 
    at com.fasterxml.jackson.databind.deser.SettableBeanProperty.deserialize(SettableBeanProperty.java:504) 
    at com.fasterxml.jackson.databind.deser.impl.MethodProperty.deserializeAndSet(MethodProperty.java:104) 
    at com.fasterxml.jackson.databind.deser.BeanDeserializer.vanillaDeserialize(BeanDeserializer.java:276) 
    at com.fasterxml.jackson.databind.deser.BeanDeserializer.deserialize(BeanDeserializer.java:140) 
    at com.fasterxml.jackson.databind.ObjectMapper._readMapAndClose(ObjectMapper.java:3798) 
    at com.fasterxml.jackson.databind.ObjectMapper.readValue(ObjectMapper.java:2922) 
    at org.springframework.http.converter.json.AbstractJackson2HttpMessageConverter.readJavaType(AbstractJackson2HttpMessageConverter.java:231) 
    ... 69 common frames omitted 
Caused by: com.fasterxml.jackson.core.JsonParseException: Invalid UTF-8 start byte 0xa0 
at [Source: [email protected]; line: 8, column: 31] 
    at com.fasterxml.jackson.core.JsonParser._constructError(JsonParser.java:1702) 
    at com.fasterxml.jackson.core.base.ParserMinimalBase._reportError(ParserMinimalBase.java:558) 
    at com.fasterxml.jackson.core.json.UTF8StreamJsonParser._reportInvalidInitial(UTF8StreamJsonParser.java:3544) 
    at com.fasterxml.jackson.core.json.UTF8StreamJsonParser._reportInvalidChar(UTF8StreamJsonParser.java:3538) 
    at com.fasterxml.jackson.core.json.UTF8StreamJsonParser._finishString2(UTF8StreamJsonParser.java:2543) 
    at com.fasterxml.jackson.core.json.UTF8StreamJsonParser._finishAndReturnString(UTF8StreamJsonParser.java:2469) 
    at com.fasterxml.jackson.core.json.UTF8StreamJsonParser.getText(UTF8StreamJsonParser.java:315) 
    at com.fasterxml.jackson.databind.deser.std.StringDeserializer.deserialize(StringDeserializer.java:36) 
    at com.fasterxml.jackson.databind.deser.std.StringDeserializer.deserialize(StringDeserializer.java:11) 
    at com.fasterxml.jackson.databind.deser.SettableBeanProperty.deserialize(SettableBeanProperty.java:504) 
    at com.fasterxml.jackson.databind.deser.impl.FieldProperty.deserializeAndSet(FieldProperty.java:111) 
    at com.fasterxml.jackson.databind.deser.BeanDeserializer.vanillaDeserialize(BeanDeserializer.java:276) 
    ... 84 common frames omitted

答

尝试设置在头的东西的内容类型和charset这样 “内容类型”， “应用/ JSON;字符集= UTF-8”

答

你可以发布更多的问题的堆栈跟踪，是否有任何预处理外部输入以消除这个有问题的字符？

0xa0不是空白，所以它不会像标准空间一样处理，这可能会导致问题。如果能进行预处理使用前的数据，只需更换（）存在问题的字符与空间，这应该

string = string.replace('\u00A0',' ')

而且删除问题，请确保您使用的是正确的类型/格式编码的数据

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