RestTemplate HttpMessageConverter报错的解决方案no suitable HttpMessageConverter

错误

no suitable HttpMessageConverter found for response type and content type [text/html;charset=UTF-8]

这边调用的时候使用了RestTemplate

使用过程

RestTemplate restTemplate = new RestTemplate();
String payUrlFinal = "http://127.0.0.1/pay?orderId=1";
PayResponse payResponse = restTemplate.getForObject(payUrlFinal, PayResponse.class);

下面是我请求的路径

 @GetMapping("/pay")
    @ResponseBody
    public PayResponse pay(@RequestParam("orderId") String orderId){
        //1.查询订单
        OrderDTO orderDTO = orderService.findOne(orderId);
        if(Objects.isNull(orderDTO)){
            //订单不存在
            throw new SellException(ResultEnum.ORDER_NOT_EXIST);
        }

        //发起支付
        PayResponse payResponse = payService.create(orderDTO);
        return payResponse;
    }

调用之后程序报以下错误

 Servlet.service() for servlet [dispatcherServlet] in context with path [] threw exception [Request processing failed; nested exception is org.springframework.web.client.RestClientException: Could not extract response: no suitable HttpMessageConverter found for response type [class com.lly835.bestpay.model.PayResponse] and content type [text/html;charset=UTF-8]] with root cause
org.springframework.web.client.RestClientException: Could not extract response: no suitable HttpMessageConverter found for response type [class com.lly835.bestpay.model.PayResponse] and content type [text/html;charset=UTF-8]
	at org.springframework.web.client.HttpMessageConverterExtractor.extractData(HttpMessageConverterExtractor.java:109)
	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.getForObject(RestTemplate.java:287)
	at com.imooc.controller.PayController.create(PayController.java:107)
	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)

解决方案：

我们继承 MappingJackson2HttpMessageConverter 并在构造过程中设置其支持的 MediaType 类型即可：

public class WxMappingJackson2HttpMessageConverter extends MappingJackson2HttpMessageConverter {
    public WxMappingJackson2HttpMessageConverter(){
        List<MediaType> mediaTypes = new ArrayList<>();
        mediaTypes.add(MediaType.TEXT_PLAIN);
        mediaTypes.add(MediaType.TEXT_HTML);  //加入text/html类型的支持
        setSupportedMediaTypes(mediaTypes);// tag6
    }
}

然后把这个 WxMappingJackson2HttpMessageConverter 追加到 RestTemplate 的 messageConverters 消息转换链中去：

RestTemplate restTemplate = new RestTemplate();
restTemplate.getMessageConverters().add(new WxMappingJackson2HttpMessageConverter());
String payUrlFinal = "http://127.0.0.1/pay?orderId=1";
PayResponse payResponse = restTemplate.getForObject(payUrlFinal, PayResponse.class);

具体原因分析可参照下面的地址：

http://blog.csdn.net/kinginblue/article/details/52706155

参考

原文：https://blog.csdn.net/u011768325/article/details/77097655