RestTemplate使用帶泛型的返回體

RestTemplate使用帶泛型的返回體

1、以同步樓宇數據爲例

    public void syncBuilding() {
        HttpEntity httpEntity = new HttpEntity(PostData.getInstance());
        // 使用ParameterizedTypeReference進行包裝
        ParameterizedTypeReference<CampusResult<List<Building>>> reference = new ParameterizedTypeReference<CampusResult<List<Building>>>() {};
        try {
            // exchange方法中需要放reference，而不是CampusResult
            ResponseEntity<CampusResult<List<Building>>> entity = restTemplate.exchange(DormConstant.GET_DORM_BUILDING, HttpMethod.POST,httpEntity,reference);
            if (entity.getStatusCode().is2xxSuccessful()){
                CampusResult<List<Building>> result = entity.getBody();
                List<Building> buildingList = result.getData();
                if (CollectionUtils.isNotEmpty(buildingList)){
                    buildingList.forEach(building -> {
                        buildingDao.save(building);
                    });
                }
            }
        }catch (Exception e){
            log.error("同步樓宇異常: {}",e.getMessage());
        }
    }

2、在此例子中使用CampusResult<7>作爲統一的接收格式。

@Data
public class CampusResult<T> {
    private String code;
    private boolean state;
    private String message;
    private T data;
}

3、在實際接收數據時T又是一個List。Bulding實體類如下

@Data
public class Building {
	private String buildingNumber;
	private String buildingName;
}

小尾巴~~
只要有積累，就會有進步