Finchley.SR1版本的[email protecte
阿新 • • 發佈：2018-12-11
我是跟著尚矽谷的SpringCloud教程學的，然後在寫程式碼的時候用了比較新的版本去替代視訊裡的教學版本。
這個問題出現在引入feign元件的時候。
使用SpringCloud的Finchley.SR1版本
引用openfeign替代了 feign，原因如下
大意是說feign是舊版本，16年就不再更新了，現在SpringCloud使用openfein去替代feign
1，在公用service介面層實現@FeignClient註解
@FeignClient(value = "MICROSERVICECLOUD-DEPT") public interface DeptClientService { @RequestMapping(value = "/dept/get/{id}", method = RequestMethod.GET) public Dept get(@PathVariable("id") long id); @RequestMapping(value = "/dept/list", method = RequestMethod.GET) public List<Dept> list(); @RequestMapping(value = "/dept/add", method = RequestMethod.POST) public boolean add(Dept dept); }
然後執行maven 的 clean 和 install，供其他模組呼叫
2，在feign模組的controller層呼叫
@RestController public class DeptController_Consumer { @Autowired private DeptClientService service; @RequestMapping(value = "/consumer/dept/get/{id}") public Dept get(@PathVariable("id") Long id) { return this.service.get(id); } @RequestMapping(value = "/consumer/dept/list") public List<Dept> list() { return this.service.list(); } @RequestMapping(value = "/consumer/dept/add") public Object add(Dept dept) { return this.service.add(dept); } }
此時IDEA針對service報錯：Could not autowire. No beans of 'DeptClientService' type found. less... (⌘F1) Inspection info:Checks autowiring problems in a bean class.
這裡報錯不影響程式碼執行，但是我沒理解深層原因。按說正常呼叫@Autowired
不會報錯。
feign主啟動類類如下
@SpringBootApplication @EnableEurekaClient @EnableFeignClients(basePackages= {"com.atguigu.spring.microservicecloudconsumerdeptfeign"}) @ComponentScan("com.atguigu.spring.microservicecloudconsumerdeptfeign") public class MicroservicecloudConsumerDeptFeignApplication { public static void main(String[] args) { SpringApplication.run(MicroservicecloudConsumerDeptFeignApplication.class, args); } }
註解@ComponentScan報紅，提示@SpringBootApplication註解已經掃描過該包，但不影響程式執行
啟動之後直接掛掉，報錯提示如下
Description:
Field service in com.atguigu.spring.microservicecloudconsumerdeptfeign.controller.DeptController_Consumer required a bean of type 'com.atguigu.spring.microservicecloudapi.service.DeptClientService' that could not be found.
Action:
Consider defining a bean of type 'com.atguigu.spring.microservicecloudapi.service.DeptClientService' in your configuration.
應該是service沒有注入進去，找不到。
這個階段我還分析不了原因，所以搜了一下，找到一個可能的解決方式
於是把主啟動類註解改成
@SpringBootApplication
@EnableEurekaClient
@EnableFeignClients(basePackages= {"com.atguigu.spring.microservicecloudapi.service","com.atguigu.spring.microservicecloudconsumerdeptfeign"})
public class MicroservicecloudConsumerDeptFeignApplication {
public static void main(String[] args) {
SpringApplication.run(MicroservicecloudConsumerDeptFeignApplication.class, args);
}
}專案正常啟動，訪問正常