1、场景:
springboot项目, 使用 spring 自家封装的 RestTemplate 来 远程调用接口
2、报错日志:
14:59:19.720 [http-nio-8080-exec-10] ERROR c.r.f.w.e.GlobalExceptionHandler - [handleRuntimeException,69] - 请求地址'/task/jobInfo/list',发生未知异常. org.springframework.web.client.UnknownContentTypeException: Could not extract response: no suitable HttpMessageConverter found for response type [interface java.util.List] and content type [text/html;charset=UTF-8] at org.springframework.web.client.HttpMessageConverterExtractor.extractData(HttpMessageConverterExtractor.java:126) at org.springframework.web.client.RestTemplate.doExecute(RestTemplate.java:778) at org.springframework.web.client.RestTemplate.execute(RestTemplate.java:711) at org.springframework.web.client.RestTemplate.postForObject(RestTemplate.java:437) at com.hidata.devops.selfops.service.impl.HiJobOperateService.getVersionRecallRemark(HiJobOperateService.java:470) at com.hidata.devops.selfops.service.impl.OpsHijobInfoServiceImpl.selectOpsHijobInfoList(OpsHijobInfoServiceImpl.java:119) at com.hidata.devops.selfops.controller.OpsHijobInfoController.list(OpsHijobInfoController.java:44) at com.hidata.devops.selfops.controller.OpsHijobInfoController$$FastClassBySpringCGLIB$$691faf83.invoke(<generated>) at org.springframework.cglib.proxy.MethodProxy.invoke(MethodProxy.java:218) at org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.invokeJoinpoint(CglibAopProxy.java:779) at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:163) at org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.proceed(CglibAopProxy.java:750) at org.springframework.security.access.intercept.aopalliance.MethodSecurityInterceptor.invoke(MethodSecurityInterceptor.java:61) at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186) at org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.proceed(CglibAopProxy.java:750) at org.springframework.aop.interceptor.ExposeInvocationInterceptor.invoke(ExposeInvocationInterceptor.java:97) at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186) at org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.proceed(CglibAopProxy.java:750) at org.springframework.aop.framework.CglibAopProxy$DynamicAdvisedInterceptor.intercept(CglibAopProxy.java:692) at com.hidata.devops.selfops.controller.OpsHijobInfoController$$EnhancerBySpringCGLIB$$239b4905.list(<generated>) at sun.reflect.GeneratedMethodAccessor932.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:498) at org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:197) at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:141)
3、分析日志,异常原因
RestTemplate请求不支持content type [text/html;charset=UTF-8]类型
4、解决办法
Springboot注入RestTemplate类,追踪RestTemplate 实例化过程发现默认的RestTemplate 只支持application/json格式,所以需要手动补充text/html格式
查看源码,如下:
@Bean("restTemplate") @Primary public RestTemplate restTemplate(){ RestTemplate restTemplate = new RestTemplate(); return restTemplate; } public RestTemplate() { ...... if (jackson2Present) { this.messageConverters.add(new MappingJackson2HttpMessageConverter()); } ..... } public MappingJackson2HttpMessageConverter() { this(Jackson2ObjectMapperBuilder.json().build()); } public MappingJackson2HttpMessageConverter(ObjectMapper objectMapper) { super(objectMapper, MediaType.APPLICATION_JSON, new MediaType("application", "*+json")); }
解决方案:
增加支持的MediaType类型:支持text/plan,text/html格式
@Bean("restTemplate") public RestTemplate restTemplate(){ RestTemplate restTemplate = new RestTemplate(); MappingJackson2HttpMessageConverter mappingJackson2HttpMessageConverter = new MappingJackson2HttpMessageConverter(); mappingJackson2HttpMessageConverter.setSupportedMediaTypes(Arrays.asList( MediaType.TEXT_HTML, MediaType.TEXT_PLAIN)); restTemplate.getMessageConverters().add(mappingJackson2HttpMessageConverter); return restTemplate; }