Error while extracting response for type [class xxx] and content type application/xml;charset=UTF-8

た入场券 2022-02-23 08:52 194阅读 0赞

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### 【前言】 ###

最近在用restTemplate进行一次http请求时发现了报错（Error while extracting response for type \[class xxx\] and content type application/xml;charset=UTF-8）经过一番尝试后最终解决问题，在此记录一下。

### 【问题及解决】 ###

一、封装http调用的方法如下：

public <T> ResponseEntity<T> postJson(String url, String requestJson, Class<T> responseType) {
    
        HttpHeaders headers = new HttpHeaders();
        headers.setContentType(MediaType.APPLICATION_JSON_UTF8);
    
        HttpEntity<String> entity = new HttpEntity<>(requestJson, headers);
    
        ResponseEntity<T> responseEntity;
    
        System.out.println(requestJson);
    
        responseEntity = restTemplate.exchange(url, HttpMethod.POST, entity, responseType);
    
        return responseEntity;
      }

二、提供方为的出参和入参均为json格式；

三、单步进行调试发现报如下错：

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3UwMTI4MjkxMjQ_size_16_color_FFFFFF_t_70][]

四、在网上查了一些资料并进行了相关验证，对调用方法设置对返回值的格式为json即可解决，相应代码如下：

public <T> ResponseEntity<T> postJson(String url, String requestJson, Class<T> responseType) {
    
        HttpHeaders headers = new HttpHeaders();
        headers.setContentType(MediaType.APPLICATION_JSON_UTF8);
    
        //设置接收返回值的格式为json
        List<MediaType> mediaTypeList = new ArrayList<>();
        mediaTypeList.add(MediaType.APPLICATION_JSON_UTF8);
        headers.setAccept(mediaTypeList);
    
        HttpEntity<String> entity = new HttpEntity<>(requestJson, headers);
    
        ResponseEntity<T> responseEntity;
    
        System.out.println(requestJson);
    
        responseEntity = restTemplate.exchange(url, HttpMethod.POST, entity, responseType);
    
        return responseEntity;
      }

### 【小结】 ###

在之前的项目中不用设置接收值的格式也是可以的，之前系统用的SpringBoot版本是1.5.x，现在的项目是将Spring Boot版本升级到2.x；在进行新项目的开发时建议使用比较新的稳定版本的框架，如果是迁移则建议沿用老版本，如果老版本代码向新框架迁移一定要进行全流程的测试，不然可能会有新老版本不兼容而导致的bug。

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[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3UwMTI4MjkxMjQ_size_16_color_FFFFFF_t_70]: /images/20220223/c1ca6c641b6e4d819d54dcc0658aa4db.png

Error while extracting response for type [class xxx] and content type application/xml;charset=UTF-8

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