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

publicinterfaceIUserService{

@RequestMapping(method =RequestMethod.GET, value ="/users/app",headers={"tenantid"})

@ApiOperation(value ="发送短信通知",httpMethod ="GET", response =User.class,notes ="请保证传入字段正确")

User getUser(@RequestParam("id")String id,@RequestHeader("tenantid")String tenantid);

@RequestMapping(method =RequestMethod.GET, value ="/users/app2")

User getUser2();

@RequestMapping(method =RequestMethod.GET, value ="/users/app3")

User getUser3();

@RequestMapping(method =RequestMethod.POST, value ="/users/app3")

User getUser4(@RequestBodyUser users);

}

spring mvc rest 接口实现

@RestController

publicclassUserServiceFeignControllerimplementsIUserService{

@Autowired

privateUserserviceImpl userserviceImpl;

@Override

publicUser getUser2(){

// TODO Auto-generated method stub

return userserviceImpl.getUser2();

}

@Override

publicUser getUser3(){

// TODO Auto-generated method stub

return userserviceImpl.getUser3();

}

@Override

publicUser getUser(String id,@RequestHeader("tenantid")String tenantid){

// TODO Auto-generated method stub

return userserviceImpl.getUser(id, tenantid);

}

@Override

publicUser getUser4(User users){

// TODO Auto-generated method stub

return users;

}

}

feign 跨服务调用

@FeignClient(url="http://localhost:8089/",name="userservicecall")

publicinterfaceIFeignUserServiceextendsIUserService{

}

注解

@SpringBootApplication

@EnableFeignClients()

publicclassApplication{

publicstaticvoid main(String[] args){

SpringApplication.run(Application.class, args);

}

}

调用

@RestController

publicclassUserCacheController{

@Autowired

privateIFeignUserService  userservice;

@RequestMapping(value ="/demo1", method =RequestMethod.GET)

publicObject  importUser(String id,@RequestHeader("tenantid")String tenantid)throwsExecutionException{

return userservice.getUser(id,tenantid);

}

}

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：

@Override

publicUser getUser(String id,@RequestHeader("tenantid")String tenantid){

// TODO Auto-generated method stub

return userserviceImpl.getUser(id, tenantid);

}