Feign调用接口解决处理内部异常的问题 Feign调用接口解决处理内部异常

问题描述：当使用feign调用接口，出现400～500～的接口问题时。会出错feign:FeignException。（因为是错误，只能用catch Throwable,不可使用catch Exception捕获异常）导致程序无法继续运行。
问题原因： 【Feign调用接口解决处理内部异常的问题】由于feign默认的错误处理类是FunFeignFallback会throw new AfsBaseExceptio导致外部无法捕获异常。

package com.ruicar.afs.cloud.common.core.feign; import com.alibaba.fastjson.JSONObject; import com.ruicar.afs.cloud.common.core.exception.AfsBaseException; import com.ruicar.afs.cloud.common.core.util.IResponse; import feign.FeignException; import lombok.AllArgsConstructor; import lombok.Data; import lombok.extern.slf4j.Slf4j; import org.springframework.cglib.proxy.MethodInterceptor; import org.springframework.cglib.proxy.MethodProxy; import org.springframework.lang.Nullable; import java.lang.reflect.Method; import java.util.Objects; @Data@AllArgsConstructor@Slf4jpublic class FunFeignFallback implements MethodInterceptor {private final Class targetType; private final String targetName; private final Throwable cause; private static byte JSON_START = '{'; @Nullable@Overridepublic Object intercept(Object o, Method method, Object[] objects, MethodProxy methodProxy) throws Throwable {String errorMessage = cause.getMessage(); if (!(cause instanceof FeignException)) {log.error("FunFeignFallback:[{}.{}] serviceId:[{}] message:[{}]", targetType.getName(), method.getName(), targetName, errorMessage); log.error("feign调用失败", cause); return IResponse.fail("请求失败，请稍后再试"); }int status = ((FeignException.FeignClientException) this.cause).status(); boolean isAuthFail = (status==426||status==403||status==401)&&"afs-auth".equals(targetName); FeignException exception = (FeignException) cause; if(isAuthFail){log.warn("授权失败==========原始返回信息:[{}]",exception.contentUTF8()); }else {log.error("FunFeignFallback:[{}.{}] serviceId:[{}] message:[{}]", targetType.getName(), method.getName(), targetName, errorMessage); log.error("", cause); log.error("原始返回信息{}",exception.contentUTF8()); }if(method.getReturnType().equals(Void.class)){throw new AfsBaseException("接口调用失败"); }if(method.getReturnType().equals(IResponse.class)){if(exception instanceof FeignException.Forbidden){return IResponse.fail("没有权限").setCode("403"); }if(exception instanceof FeignException.NotFound){return IResponse.fail("请求路径不存在").setCode("404"); }if(exception instanceof FeignException.BadRequest){return IResponse.fail("参数错误").setCode("400"); } if(exception.content()==null||exception.content().length==0){return IResponse.fail("请求失败，请稍后再试"); }if(JSON_START==exception.content()[0]){return JSONObject.parseObject(exception.content(),IResponse.class); }else{return IResponse.fail(exception.contentUTF8()); }}else{try {if(method.getReturnType().equals(String.class)){return exception.contentUTF8(); }else if(method.getReturnType().equals(JSONObject.class)){if(JSON_START==exception.content()[0]){return JSONObject.parseObject(exception.content(), JSONObject.class); }}else if(!method.getReturnType().equals(Object.class)){return JSONObject.parseObject(exception.content(), method.getReturnType()); }if(JSON_START==exception.content()[0]){JSONObject jsonObject = JSONObject.parseObject(exception.content(), JSONObject.class); if(jsonObject.containsKey("code")&&jsonObject.containsKey("msg")) {return jsonObject.toJavaObject(IResponse.class); }}}catch (Throwable e){}throw new AfsBaseException("接口调用失败"); }} @Overridepublic boolean equals(Object o) {if (this == o) {return true; }if (o == null || getClass() != o.getClass()) {return false; }FunFeignFallback that = (FunFeignFallback) o; return targetType.equals(that.targetType); } @Overridepublic int hashCode() {return Objects.hash(targetType); } }

问题解决：自定义feignFallback异常处理： 1.自定义异常处理 InvoiceApiFeignFallbackFactory

package com.ruicar.afs.cloud.invoice.factory; import com.ruicar.afs.cloud.invoice.fallback.InvoiceApiFeignFallback; import com.ruicar.afs.cloud.invoice.feign.InvoiceApiFeign; import feign.hystrix.FallbackFactory; import org.springframework.stereotype.Component; @Componentpublic class InvoiceApiFeignFallbackFactory implements FallbackFactory {@Overridepublic InvoiceApiFeign create(Throwable throwable) {InvoiceApiFeignFallback invoiceApiFeignFallback = new InvoiceApiFeignFallback(); invoiceApiFeignFallback.setCause(throwable); return invoiceApiFeignFallback; }}

2.feign调用 InvoiceApiFeignFallbackFactory

package com.ruicar.afs.cloud.invoice.feign; import com.alibaba.fastjson.JSONObject; import com.ruicar.afs.cloud.common.core.feign.annotations.AfsFeignClear; import com.ruicar.afs.cloud.invoice.dto.InvoiceCheckDto; import com.ruicar.afs.cloud.invoice.factory.InvoiceApiFeignFallbackFactory; import io.swagger.annotations.ApiOperation; import org.springframework.cloud.openfeign.FeignClient; import org.springframework.web.bind.annotation.PostMapping; import org.springframework.web.bind.annotation.RequestBody; import org.springframework.web.bind.annotation.RequestHeader; import java.util.Map; /** * @description: 发票验证接口 * @author: rongji.zhang * @date: 2020/8/14 10:32 */@FeignClient(name = "invoice", url = "${com.greatwall.systems.invoice-system.url}" ,fallbackFactory = InvoiceApiFeignFallbackFactory.class)public interface InvoiceApiFeign {/**** @param dto* @return*/@ApiOperation("获取业务数据API接口")@PostMapping(value = "https://www.it610.com/vi/check")@AfsFeignClear(true)//通过此注解防止添加内部tokenJSONObject InvoiceCheck(@RequestBody InvoiceCheckDto dto, @RequestHeader Map headers); }

3.实现自定义报错处理

package com.ruicar.afs.cloud.invoice.fallback; import com.alibaba.fastjson.JSONObject; import com.ruicar.afs.cloud.invoice.dto.InvoiceCheckDto; import com.ruicar.afs.cloud.invoice.feign.InvoiceApiFeign; import lombok.Setter; import lombok.extern.slf4j.Slf4j; import org.springframework.stereotype.Component; import java.util.Map; /** * @author Fzero * @date 2019-01-24 */@Slf4j@Componentpublic class InvoiceApiFeignFallback implements InvoiceApiFeign { @Setterprivate Throwable cause; /*** @param dto* @param headers* @return*/@Overridepublic JSONObject InvoiceCheck(InvoiceCheckDto dto, Map headers) {log.error("feign 接口调用失败", cause); return null; }}

Feign远程调用失败-----丢请求头

@FeignClient("guli-cart")public interface CartFenignService { @GetMapping("/currentUserCartItems")List getCurrentUserCartItems(); }// 这样去掉接口时其实Feign在底层是一个全新的requst所有请求头就没有了

解决办法使用Feign远程掉用拦截器，在远程请求是先创建拦截器

@Bean("requestInterceptor")public RequestInterceptor requestInterceptor() {return new RequestInterceptor() {@Overridepublic void apply(RequestTemplate template) { /*** 把以前的Cookie放到新请求中去原理就是运用了同一线程数据共享ThreadLocal*/ServletRequestAttributes attributes = (ServletRequestAttributes) RequestContextHolder.getRequestAttributes(); HttpServletRequest request = attributes.getRequest(); String cookie = request.getHeader("Cookie"); template.header("Cookie", cookie); }}; }

但是上面的办法只能解决同意线程问题，在多线程下还是会丢失请求头
多线程下解决办法：