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                ## feign中的hystrix hystrix在feign中默認是關閉的,需要手動啟用. 并且啟動類上的注解不能少,推薦使用@SpringCloudApplication注解. ~~~ feign: hystrix: enabled: true ~~~ feign中的Fallback配置不想ribbon中那樣簡單了.比較麻煩的是需要為每一個放大單獨寫異常邏輯. ## feign接口 ~~~ package com.like.client; import org.springframework.cloud.openfeign.FeignClient; import org.springframework.web.bind.annotation.GetMapping; import org.springframework.web.bind.annotation.PathVariable; @FeignClient(value = "user-server",fallback = UserClientImpl.class) //服務名稱. fallback的值是實現類的名稱字節碼對象 public interface UserClient { @GetMapping("/user/{id}") String queryById(@PathVariable("id") Long id); //方法名隨意 } ~~~ ## 實現類 ~~~ package com.like.client; import org.springframework.stereotype.Component; @Component //需要加上次注解 public class UserClientImpl implements UserClient //實現 { @Override public String queryById(Long id) { //這里返回異常邏輯 return "feign的異常" } } ~~~ ## 測試 ![](https://box.kancloud.cn/cdddc1082186f65586f8c24afeef5ff2_1148x652.png)
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