spring cloud feign 接口继承以及参数传递的问题

1. 优势

 

  可以使用maven 进行访问，实现代码的共享，减少跨服务调用服务编写的问题

 

2. 使用

 

   定义接口

1. publicinterfaceIUserService{
2. @RequestMapping(method =RequestMethod.GET, value ="/users/app",headers={"tenantid"})
3. @ApiOperation(value ="发送短信通知",httpMethod ="GET", response =User.class,notes ="请保证传入字段正确")
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  接口实现

 

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 跨服务调用

 

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. }

调用

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. 注意问题

   尽管使用接口继承，但是还是会发现部分参数是没法继承的类似 header 解决方法

   调整rest 实现接口方法的签名，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. }