OpenFeign的Java接口定义规范是什么

OpenFeign的Java接口定义规范如下：

1. 使用@FeignClient注解标记接口，指定服务名称和路径

@FeignClient(name = "service-name", path = "/api") public interface MyFeignClient { // 接口方法 }

1. 定义接口方法，并使用@RequestMapping注解指定请求方法、路径和参数

@FeignClient(name = "service-name", path = "/api") public interface MyFeignClient { @RequestMapping(method = RequestMethod.GET, value = "/users/{userId}") User getUserById(@PathVariable("userId") Long userId); }

1. 定义接口方法参数和返回值

public class User { private Long id; private String name; // getters and setters }

1. 使用@RequestParam、@PathVariable等注解指定参数来源和值

@FeignClient(name = "service-name", path = "/api") public interface MyFeignClient { @RequestMapping(method = RequestMethod.GET, value = "/users") List<User> getUsers(@RequestParam("page") int page, @RequestParam("size") int size); }

1. 接口方法可以定义任意类型的参数和返回值，包括基本类型、对象类型、集合类型等

@FeignClient(name = "service-name", path = "/api") public interface MyFeignClient { @RequestMapping(method = RequestMethod.POST, value = "/users") void createUser(User user); }