1. 問題描述

@FeignClient(name = "dataServiceQueryInterface", url = "${url}:${port}") public interface DataServiceQueryInterface {@GetMapping("/dataReport/getSysAreaAllList")List<SysArea> getSysAreaAllList() throws Exception; }

使用接口獲取數據時報錯：

Servlet.service() for servlet [dispatcherServlet] in context with path [] threw exception [Request processing failed; nested exception is feign.codec.DecodeException: Error while extracting response for type [java.util.List<com.xxx.datamatch.datacar.entity.SysArea>] and content type [application/json;charset=UTF-8]; nested exception is org.springframework.http.converter.HttpMessageNotReadableException: JSON parse error: Cannot deserialize value of type `java.util.ArrayList<com.xxx.datamatch.datacar.entity.SysArea>` from Object value (token `JsonToken.START_OBJECT`); nested exception is com.fasterxml.jackson.databind.exc.MismatchedInputException: Cannot deserialize value of type `java.util.ArrayList<com.xxx.datamatch.datacar.entity.SysArea>` from Object value (token `JsonToken.START_OBJECT`)

2. 問題方法

試驗 1 添加依賴【無任何效果】

<dependency><groupId>com.alibaba</groupId><artifactId>fastjson</artifactId><version>1.2.46</version> </dependency>

試驗 2 修改返回類型【不報錯 但是結果數據是字符串 未封裝需要自行解析】

@FeignClient(name = "dataServiceQueryInterface", url = "${url}:${port}") public interface DataServiceQueryInterface {@GetMapping("/dataReport/getSysAreaAllList")String getSysAreaAllList() throws Exception; }

最終解決方案 3【將@GetMapping修改為@PostMapping】

@FeignClient(name = "dataServiceQueryInterface", url = "${url}:${port}") public interface DataServiceQueryInterface {@PostMapping("/dataReport/getSysAreaAllList")List<SysArea> getSysAreaAllList() throws Exception; }

原因沒有進行深入探究，有知道原因的小伙伴可以分享一下~

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