RestTemplate.postForObject泛型丢失返回LinkedHashMap问题解决_resttemplate.postforobject 泛型

在使用RestTemplate.postForObject方法远程调用接口

返回的时候会自动转成LinkedHashMap，造成ClassCastException类型转换异常

/**
     * post
     * @param url 请求地址
     * @param param 参数
     * @param returnClass 返回类型
     * @return
     */
    public <E> E postByDefault(String url, E param, Class<E> returnClass) {
        final HttpHeaders headers = new HttpHeaders();
        headers.setContentType(MediaType.APPLICATION_JSON);
        headers.set("Accept", "application/json");
        final HttpEntity<E> httpEntity = new HttpEntity<>(param, headers);
        return this.restTemplate.postForObject(url, httpEntity, returnClass);
    }

解决办法

第一种： 

JSONObject object = restTemplateClient.postByDefault(url,param, JSONObject.class);
SysUserInfo[] userInfos = object.getObject("data",SysUserInfo[].class);
List<SysUserInfo> userInfoList = Arrays.asList(userInfos);

第二种：

ParameterizedTypeReference<List<SysUserInfo>> typeRef = new ParameterizedTypeReference<List<SysUserInfo>>() {};
ResponseEntity<List<SysUserInfo>> responseEntity = restTemplate.exchange(url, HttpMethod.POST, new HttpEntity<>(param), typeRef);
List<SysUserInfo> userinfoList= responseEntity.getBody();

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