摘要：
Java异常处理008:RestTemplate请求无法提取响应：nosuitableHttpMessageConverterfoundforresponsetype…contenttype[text/html；charset=UTF-8]异常开始1-异常日志：2020-12-0216:42:39.386ERROR6180---[nio-8080-
Java异常处理008：RestTemplate请求Could not extract response: no suitable HttpMessageConverter found for response type.... content type [text/html;charset=UTF-8]异常
start
1-异常日志：
2020-12-02 16:42:39.386 ERROR 6180 --- [nio-8080-exec-2] o.a.c.c.C.[.[.[/].[dispatcherServlet] : Servlet.service() for servlet [dispatcherServlet] in context with path [] threw exception [Request processing failed; nested exception is org.springframework.web.client.UnknownContentTypeException: Could not extract response: no suitable HttpMessageConverter found for response type [class com.tyj.study.rest_template.ResponseB] and content type [text/html;charset=UTF-8]] with root cause org.springframework.web.client.UnknownContentTypeException: Could not extract response: no suitable HttpMessageConverter found for response type [class com.tyj.study.rest_template.ResponseB] and content type [text/html;charset=UTF-8] at org.springframework.web.client.HttpMessageConverterExtractor.extractData(HttpMessageConverterExtractor.java:126) ~[spring-web-5.2.8.RELEASE.jar:5.2.8.RELEASE] at org.springframework.web.client.RestTemplate$ResponseEntityResponseExtractor.extractData(RestTemplate.java:998) ~[spring-web-5.2.8.RELEASE.jar:5.2.8.RELEASE] at org.springframework.web.client.RestTemplate$ResponseEntityResponseExtractor.extractData(RestTemplate.java:981) ~[spring-web-5.2.8.RELEASE.jar:5.2.8.RELEASE] at org.springframework.web.client.RestTemplate.doExecute(RestTemplate.java:741) ~[spring-web-5.2.8.RELEASE.jar:5.2.8.RELEASE] at org.springframework.web.client.RestTemplate.execute(RestTemplate.java:674) ~[spring-web-5.2.8.RELEASE.jar:5.2.8.RELEASE] at org.springframework.web.client.RestTemplate.getForEntity(RestTemplate.java:342) ~[spring-web-5.2.8.RELEASE.jar:5.2.8.RELEASE]
......
2-异常原因：即RestTemplate请求不支持content type [text/html;charset=UTF-8]类型
3-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
@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"));
} 4-解决方案
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;
} end