OpenFeign远程调用报错：Could not extract response: no suitable HttpMessageConverter found for response type

远程调用的项目使用PHP写的，因此我只能通过页面的请求参数封装请求Vo，然后调用PHP项目的接口封装响应类。

① 请求体：Feign接口中请求体的字段要比调用的PHP项目中接口的请求体字段少

@Data
public class AssetListQo {
    @JsonProperty(value = "time_range")
    private String timeRange;

    @JsonProperty(value = "branch_id")
    private String branchId;

    private Integer start;

    private Integer limit;

    @JsonProperty(value = "need_risk_tags")
    private Boolean needRiskTags;

    @JsonProperty(value = "task_id")
    private String taskId;
}

② OpenFiegn接口

@FeignClient(url = "${proxy.base_url}", name = "${apps.asset.registry_name}")
public interface AssetFeignClient {
    @RequestMapping(value = "${apps.asset.urls.asset.list}", method = RequestMethod.POST)
    AssetApiResponse<List<AssetListVo>> getAssetList(@RequestBody AssetListQo assetListQo);
}

③ application.yml文件：

apps:
    asset:
      registry_name: Asset
      urls:
        asset:
          list: /apps/asset/asset_view/on_list

④ 远程调用PHP项目的/apps/asset/asset_view/on_list接口，其响应结果为：

{
    "success": true,
    "data": [
        {
            "id": 7,
            "asset_name": "test2",
            "host_name": "",
            "name": "1.0.0.3",
            "mac": "",
            "ip": "1.0.0.3",
            "is_dynamic": false,
            "status": "online",
            "magnitude": "normal",
            "classify1_id": 1,
            "classify_id": 10000,
            "classify_name": "服务器",
            "tags": [],
            "protocol_port": [],
            "system": "",
            "first_time": "2022-04-15 11:06:39",
            "last_time": "2022-04-15 11:06:39",
            "find_type": "manually",
            "branch_id": 0,
            "branch_name": "-",
            "user": [],
            "users": [],
            "source_device": [],
            "dev_type": [],
            "service": [],
            "comment": "",
            "domain_name": "",
            "location": {
                "country": "中国",
                "country_id": 737014929,
                "province": "",
                "province_id": 1744973543,
                "city": "",
                "city_id": 1744973543
            },
            "is_down_asset": false,
            "system_name": "",
            "department": "-",
            "uses": "",
            "business_name": "",
            "risk_tags": []
        },
        {
            "id": 6,
            "asset_name": "test1",
            "host_name": "",
            "name": "1.0.0.1",
            "mac": "",
            "ip": "1.0.0.1",
            "is_dynamic": false,
            "status": "online",
            "magnitude": "normal",
            "classify1_id": 1,
            "classify_id": 10000,
            "classify_name": "服务器",
            "tags": [],
            "protocol_port": [],
            "system": "",
            "first_time": "2022-04-15 11:06:23",
            "last_time": "2022-04-15 11:06:23",
            "find_type": "manually",
            "branch_id": 0,
            "branch_name": "-",
            "user": [],
            "users": [],
            "source_device": [],
            "dev_type": [],
            "service": [],
            "comment": "",
            "domain_name": "",
            "location": {
                "country": "中国",
                "country_id": 737014929,
                "province": "",
                "province_id": 1744973543,
                "city": "",
                "city_id": 1744973543
                "latitude": ""
            },
            "is_down_asset": false,
            "system_name": "",
            "department": "-",
            "uses": "",
            "business_name": "",
            "risk_tags": []
        }
    ],
    "total": 2
}

⑤ Feign接口的响应类为：可以看到OPenFeign接口响应类比PHP项目中接口的响应类字段要少；

@Data
public class AssetApiResponse<T> {

    private Boolean success;

    private Integer total;

    private T data;

}

@Data
@JsonInclude(value = JsonInclude.Include.NON_NULL)
public class AssetListVo {

    private Integer id;

    @JsonProperty(value = "asset_name")
    private String assetName;

    @JsonProperty(value = "host_name")
    private String hostName;

    private String name;

    private String ip;

    private String status;

    @JsonProperty(value = "branch_id")
    private Integer branchId;

    @JsonProperty(value = "branch_name")
    private String branchName;
}

注意：

① Feign接口中请求类的字段可以比远程调用接口的请求类字段少；

② Feign接口中响应类的字段可以比远程调用接口的响应类字段少；

③ 当响应类封装的不对时，先将远程调用的响应类型设置为String，观察响应结果；

解决过程：

@FeignClient(url = "${proxy.base_url}", name = "${apps.asset.registry_name}")
public interface AssetFeignClient {
    @RequestMapping(value = "${apps.asset.urls.asset.list}", method = RequestMethod.POST)
    String getAssetList(@RequestBody AssetListQo assetListQo);
}

先把Fiegn接口中PHP项目中接口的响应类型设置为String，拿到响应结果，然后根据响应结果封装响应类。

使用Feign接口：

@Override
public List<AssetListVo> assetList(AssetListQo assetListQo) {
    AssetApiResponse<List<AssetListVo>> assetList = assetFeignClient.getAssetList(assetListQo);
    return assetList.getData();
}