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Spring Boot FeignClient 如何捕获业务异常信息

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Spring Boot FeignClient 捕获业务异常信息

因项目重构采用spring cloud,feign不可避免。目前spring cloud在国内还不是很成熟,所以踩坑是免不了的。最近处理全局异常的问题,搜了个遍也没找到合适的解决方案 。

1.全局异常处理

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import com.bossien.common.comm.entity.ResponseDto;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.web.bind.annotation.ControllerAdvice;
import org.springframework.web.bind.annotation.ExceptionHandler;
import org.springframework.web.bind.annotation.ResponseBody;
@ControllerAdvice
public class GlobalExceptionHandler {
     private static final Logger logger = LoggerFactory.getLogger(GlobalExceptionHandler. class );
     /**
      * @Author: lixg
      * @Description: 系统异常捕获处理
      */
     @ResponseBody
     @ExceptionHandler (value = Exception. class )
     public ResponseDto errorExceptionHandler(Exception ex) { //APIResponse是项目中对外统一的出口封装,可以根据自身项目的需求做相应更改
         logger.error( "捕获到 Exception 异常" , ex);
         //异常日志入库
         return new ResponseDto(ResponseDto.RESPONSE_FAIL, "系统繁忙,请稍后再试" );
     }
     /**
      * @Author: lixg
      * @Description: 自定义异常捕获处理
      */
     @ResponseBody
     @ExceptionHandler (value = BusinessException. class ) //BusinessException是自定义的一个异常
     public ResponseDto businessExceptionHandler(BusinessException ex) {
         logger.error( "捕获到 BusinessException 异常: code=" + ex.getCode() + " , errorMessage=" + ex.getErrorMessage());
         return new ResponseDto(ex.getCode(), ex.getErrorMessage());
     }
}

2.请求参数解析handler

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import com.alibaba.fastjson.JSONObject;
import com.ocean.common.comm.entity.ResponseDto;
import com.ocean.common.core.exception.BusinessException;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/***
  * @author lixg
  *
  * feign请求响应对象处理
  */
public class ResponseHandler {
     private final static Logger logger = LoggerFactory.getLogger(ResponseHandler. class );
     /**
      * 解析请求响应对象
      * @param responseDto
      * @param clazz
      * @return
      * @throws BusinessException
      */
     public static Object getResponseData(ResponseDto responseDto, Class clazz) throws BusinessException {
         if (EmptyUtil.isEmpty(responseDto)){
             throw new BusinessException(BusinessException.OBJECT_IS_NULL, "请求响应为空!" );
         }
         if (ResponseDto.RESPONSE_SUCCESS.equals(responseDto.getCode())){
             try {
                 String json = JSONObject.toJSONString(responseDto.getData());
                 return JSONObject.parseObject(json, clazz);
             } catch (Exception e){
                 logger.error( "响应对象转换异常:" +clazz.getName(),e);
                 throw new BusinessException(BusinessException.OBJECT_IS_NULL, "响应对象转换失败!" );
             }
         } else {
             throw new BusinessException(responseDto.getCode(),responseDto.getMessage());
         }
     }
}

3.业务feign接口

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package com.bossien.usercenter.user.feign;
import com.bossien.common.comm.entity.ResponseDto;
import com.bossien.common.comm.util.PageModel;
import com.bossien.common.comm.constant.SearchEntity;
import com.bossien.common.core.exception.BusinessException;
import com.bossien.usercenter.user.entity.User;
import org.springframework.cloud.openfeign.FeignClient;
import org.springframework.stereotype.Repository;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RequestParam;
import java.util.List;
import java.util.Map;
@FeignClient (value= "bossien-usercenter-service" ,path = "/userFeign" )
@Repository
public interface UserFeign {
     @RequestMapping (value = "getUserInfo" ,method = RequestMethod.GET)
     User getUserInfo( @RequestParam ( "userId" ) Long userId);
     @RequestMapping (value = "getUserInfoByTicket" ,method = RequestMethod.GET)
     ResponseDto getUserInfoByTicket( @RequestParam ( "ticket" ) String ticket) throws BusinessException;
  }

总结:

@controllerAdvice或者HandlerExceptionResolver是不能直接捕获到FeignException,所以需要在Feign层面拿到具体异常重新封装。最后总算把cloud service内部的异常安全(一样的错误码、一样的错误信息)送给了client!.

Feign调用异常处理

consumer服务调用Producer服务接口时,提示一下异常 。

no suitable HttpMessageConverter found for request type 。

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feign.codec.EncodeException: Could not write request: no suitable HttpMessageConverter found for request type [com.xxx.pojo.Xxx] and content type [application/x-www-form-urlencoded]
  at org.springframework.cloud.openfeign.support.SpringEncoder.encode(SpringEncoder.java: 143 ) ~[spring-cloud-openfeign-core- 2.1 . 0 .RELEASE.jar: 2.1 . 0 .RELEASE]
  at feign.ReflectiveFeign$BuildEncodedTemplateFromArgs.resolve(ReflectiveFeign.java: 372 ) ~[feign-core- 10.1 . 0 .jar:na]
  at feign.ReflectiveFeign$BuildTemplateByResolvingArgs.create(ReflectiveFeign.java: 224 ) ~[feign-core- 10.1 . 0 .jar:na]
  at feign.SynchronousMethodHandler.invoke(SynchronousMethodHandler.java: 74 ) ~[feign-core- 10.1 . 0 .jar:na]
  at feign.hystrix.HystrixInvocationHandler$ 1 .run(HystrixInvocationHandler.java: 106 ) ~[feign-hystrix- 10.1 . 0 .jar:na]
  at com.netflix.hystrix.HystrixCommand$ 2 .call(HystrixCommand.java: 302 ) ~[hystrix-core- 1.5 . 18 .jar: 1.5 . 18 ]
  at com.netflix.hystrix.HystrixCommand$ 2 .call(HystrixCommand.java: 298 ) ~[hystrix-core- 1.5 . 18 .jar: 1.5 . 18 ]
  at rx.internal.operators.OnSubscribeDefer.call(OnSubscribeDefer.java: 46 ) ~[rxjava- 1.2 . 0 .jar: 1.2 . 0 ]
  at rx.internal.operators.OnSubscribeDefer.call(OnSubscribeDefer.java: 35 ) ~[rxjava- 1.2 . 0 .jar: 1.2 . 0 ]
  at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java: 48 ) ~[rxjava- 1.2 . 0 .jar: 1.2 . 0 ]
  at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java: 30 ) ~[rxjava- 1.2 . 0 .jar: 1.2 . 0 ]
  at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java: 48 ) ~[rxjava- 1.2 . 0 .jar: 1.2 . 0 ]
  at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java: 30 ) ~[rxjava- 1.2 . 0 .jar: 1.2 . 0 ]
  at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java: 48 ) ~[rxjava- 1.2 . 0 .jar: 1.2 . 0 ]
  at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java: 30 ) ~[rxjava- 1.2 . 0 .jar: 1.2 . 0 ]
  at rx.Observable.unsafeSubscribe(Observable.java: 10151 ) ~[rxjava- 1.2 . 0 .jar: 1.2 . 0 ]
  at rx.internal.operators.OnSubscribeDefer.call(OnSubscribeDefer.java: 51 ) ~[rxjava- 1.2 . 0 .jar: 1.2 . 0 ]
  at rx.internal.operators.OnSubscribeDefer.call(OnSubscribeDefer.java: 35 ) ~[rxjava- 1.2 . 0 .jar: 1.2 . 0 ]
  at rx.Observable.unsafeSubscribe(Observable.java: 10151 ) ~[rxjava- 1.2 . 0 .jar: 1.2 . 0 ]
  at rx.internal.operators.OnSubscribeDoOnEach.call(OnSubscribeDoOnEach.java: 41 ) ~[rxjava- 1.2 . 0 .jar: 1.2 . 0 ]
  at rx.internal.operators.OnSubscribeDoOnEach.call(OnSubscribeDoOnEach.java: 30 ) ~[rxjava- 1.2 . 0 .jar: 1.2 . 0 ]
  at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java: 48 ) ~[rxjava- 1.2 . 0 .jar: 1.2 . 0 ]
  at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java: 30 ) ~[rxjava- 1.2 . 0 .jar: 1.2 . 0 ]
  at rx.Observable.unsafeSubscribe(Observable.java: 10151 ) ~[rxjava- 1.2 . 0 .jar: 1.2 . 0 ]
  at rx.internal.operators.OperatorSubscribeOn$ 1 .call(OperatorSubscribeOn.java: 94 ) ~[rxjava- 1.2 . 0 .jar: 1.2 . 0 ]
  at com.netflix.hystrix.strategy.concurrency.HystrixContexSchedulerAction$ 1 .call(HystrixContexSchedulerAction.java: 56 ) ~[hystrix-core- 1.5 . 18 .jar: 1.5 . 18 ]
  at com.netflix.hystrix.strategy.concurrency.HystrixContexSchedulerAction$ 1 .call(HystrixContexSchedulerAction.java: 47 ) ~[hystrix-core- 1.5 . 18 .jar: 1.5 . 18 ]
  at com.netflix.hystrix.strategy.concurrency.HystrixContexSchedulerAction.call(HystrixContexSchedulerAction.java: 69 ) ~[hystrix-core- 1.5 . 18 .jar: 1.5 . 18 ]
  at rx.internal.schedulers.ScheduledAction.run(ScheduledAction.java: 55 ) ~[rxjava- 1.2 . 0 .jar: 1.2 . 0 ]
  at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java: 511 ) ~[na: 1.8 .0_221]
  at java.util.concurrent.FutureTask.run(FutureTask.java: 266 ) ~[na: 1.8 .0_221]
  at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java: 1149 ) ~[na: 1.8 .0_221]
  at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java: 624 ) ~[na: 1.8 .0_221]
  at java.lang.Thread.run(Thread.java: 748 ) [na: 1.8 .0_221]

异常原因

如字面意思:

at org.springframework.cloud.openfeign.support.SpringEncoder.encode 。

缺少HttpMessageConverter 的编码器 。

解决方法

缺少那就加进去 。

将SpringFormEncoder加入到容器中 。

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import feign.codec.Encoder;
import feign.form.spring.SpringFormEncoder;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.Primary;
import org.springframework.context.annotation.Scope;
/**
  * @author jianming
  * @create 2021-02-06-15:42
  */
@Configuration
public class FeignSupportConfig {
     @Bean
     @Primary
     @Scope ( "prototype" )
     public Encoder multipartFormEncoder() {
         return new SpringFormEncoder();
     }
}

问题处理完成 。

Consumer的Feign使用

处理需要上述的编码器,还需在接口中指定ContentType 。

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@Service
@FeignClient (value = "XXX-XXX" )
public interface LoginService {
     /**
      * 指定contentType
      */
     @PostMapping (value = "/register" , consumes = MediaType.APPLICATION_FORM_URLENCODED_VALUE)
     public MsgUtils create(User user);
}

Producer正常编写即可!以上为个人经验,希望能给大家一个参考,也希望大家多多支持我.

原文链接:https://blog.csdn.net/qq_36988277/article/details/90214665 。

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