spring cloud feign 接口繼承以及參數傳遞的問題

1. 優勢

 

  可以使用maven 進行訪問，實現代碼的共享，減少跨服務調用服務編寫的問題

 

2. 使用

 

   定義接口

   

1. publicinterfaceIUserService{
2. @RequestMapping(method =RequestMethod.GET, value ="/users/app",headers={"tenantid"})
3. @ApiOperation(value ="發送短信通知",httpMethod ="GET", response =User.class,notes ="請保證傳入字段正確")
4. User getUser(@RequestParam("id")String id,@RequestHeader("tenantid")String tenantid);
5. @RequestMapping(method =RequestMethod.GET, value ="/users/app2")
6. User getUser2();
7. @RequestMapping(method =RequestMethod.GET, value ="/users/app3")
8. User getUser3();
9. @RequestMapping(method =RequestMethod.POST, value ="/users/app3")
10. User getUser4(@RequestBodyUser users);
11. }

spring mvc rest  接口實現

 

 

2. @RestController
3. publicclassUserServiceFeignControllerimplementsIUserService{
5. @Autowired
6. privateUserserviceImpl userserviceImpl;
7. @Override
8. publicUser getUser2(){
9. // TODO Auto-generated method stub
10. return userserviceImpl.getUser2();
11. }
13. @Override
14. publicUser getUser3(){
15. // TODO Auto-generated method stub
16. return userserviceImpl.getUser3();
17. }
19. @Override
20. publicUser getUser(String id,@RequestHeader("tenantid")String tenantid){
21. // TODO Auto-generated method stub
22. return userserviceImpl.getUser(id, tenantid);
23. }
25. @Override
26. publicUser getUser4(User users){
27. // TODO Auto-generated method stub
28. return users;
29. }
31. }

feign 跨服務調用

 

1. @FeignClient(url="http://localhost:8089/",name="userservicecall")
2. publicinterfaceIFeignUserServiceextendsIUserService{
4. }

注解

1. @SpringBootApplication
2. @EnableFeignClients()
3. publicclassApplication{
5. publicstaticvoid main(String[] args){
6. SpringApplication.run(Application.class, args);
7. }
8. }

調用

1. @RestController
2. publicclassUserCacheController{
4. @Autowired
5. privateIFeignUserService userservice;
6. @RequestMapping(value ="/demo1", method =RequestMethod.GET)
7. publicObject importUser(String id,@RequestHeader("tenantid")String tenantid)throwsExecutionException{
8. return userservice.getUser(id,tenantid);
9. }
10. }

3. 注意問題

   盡管使用接口繼承，但是還是會發現部分參數是沒法繼承的類似 header 解決方法

   調整rest 實現接口方法的簽名，如下：

  

1. @Override
2. publicUser getUser(String id,@RequestHeader("tenantid")String tenantid){
3. // TODO Auto-generated method stub
4. return userserviceImpl.getUser(id, tenantid);
5. }