RestTemplateMessageConvert详解

new RestTemplate()默认支持如下类型的http消息转换器

思考&＃xff1a;

• 为什么消息转换器列表中没有text/html 类型&＃xff1f;
  • 因为RestTemplate 请求一般都是接口之间的请求&＃xff0c;最常用的类型是JSON或XML格式,几乎不存在text/html 类型

RestTemplate.java 默认初始化方法如下&＃xff1a;

public RestTemplate() {this.messageConverters.add(new ByteArrayHttpMessageConverter());this.messageConverters.add(new StringHttpMessageConverter());this.messageConverters.add(new ResourceHttpMessageConverter(false));if (!shouldIgnoreXml) {try {this.messageConverters.add(new SourceHttpMessageConverter<>());}catch (Error err) {// Ignore when no TransformerFactory implementation is available}}this.messageConverters.add(new AllEncompassingFormHttpMessageConverter());if (romePresent) {this.messageConverters.add(new AtomFeedHttpMessageConverter());this.messageConverters.add(new RssChannelHttpMessageConverter());}if (!shouldIgnoreXml) {if (jackson2XmlPresent) {this.messageConverters.add(new MappingJackson2XmlHttpMessageConverter());}else if (jaxb2Present) {this.messageConverters.add(new Jaxb2RootElementHttpMessageConverter());}}if (jackson2Present) {this.messageConverters.add(new MappingJackson2HttpMessageConverter());}else if (gsonPresent) {this.messageConverters.add(new GsonHttpMessageConverter());}else if (jsonbPresent) {this.messageConverters.add(new JsonbHttpMessageConverter());}else if (kotlinSerializationJsonPresent) {this.messageConverters.add(new KotlinSerializationJsonHttpMessageConverter());}if (jackson2SmilePresent) {this.messageConverters.add(new MappingJackson2SmileHttpMessageConverter());}if (jackson2CborPresent) {this.messageConverters.add(new MappingJackson2CborHttpMessageConverter());}this.uriTemplateHandler &＃61; initUriTemplateHandler();}


修改默认字符集为UTF-8

&＃64;BeanRestTemplate restTemplate() {RestTemplate restTemplate &＃61; new RestTemplate();// 重置字符编码为UTF-8 StringHttpMessageConverter 处理 text/plain 和*/*restTemplate.getMessageConverters().set(1, new StringHttpMessageConverter(StandardCharsets.UTF_8));// 重置字符编码为UTF-8 MappingJackson2HttpMessageConverter application/json和application/*&＃43;jsonMappingJackson2HttpMessageConverter mappingJackson2HttpMessageConverter &＃61; new MappingJackson2HttpMessageConverter();mappingJackson2HttpMessageConverter.setDefaultCharset(StandardCharsets.UTF_8);restTemplate.getMessageConverters().set(6, mappingJackson2HttpMessageConverter);return restTemplate;}