SpringBoot使用Feign进行服务间通信的实现示例代码

<dependency>
    <groupId>org.springframework.cloud</groupId>
    <artifactId>spring-cloud-starter-openfeign</artifactId>
    <version>3.1.5</version>
</dependency>

package com.example.nettydemo;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.openfeign.EnableFeignClients;


@SpringBootApplication
@EnableFeignClients
public class NettyDemoApplication {

    public static void main(String[] args) {
        SpringApplication.run(NettyDemoApplication.class, args);
    }
}

package com.example.nettydemo.feign;

import com.example.nettydemo.entity.User;
import org.springframework.cloud.openfeign.FeignClient;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;

/**
 * @author qx
 * @date 2023/12/28
 * @des Feign客户端
 */
@FeignClient(url = "http://127.0.0.1:8090/user", name = "user")
public interface UserFeignClient {


    @GetMapping("/{id}")
    User selectUserById(@PathVariable("id") Long id);

}

package com.example.nettydemo.controller;

import com.example.nettydemo.entity.User;
import com.example.nettydemo.service.UserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

/**
 * @author qx
 * @date 2023/12/28
 * @des
 */
@RestController
@RequestMapping("/user")
public class UserController {

    @Autowired
    private UserService userService;


    @GetMapping("/{id}")
    public User selectUserById(@PathVariable("id") Long id) {
        return userService.getUserById(id);
    }
}

package com.example.nettydemo.controller;

import com.example.nettydemo.entity.User;
import com.example.nettydemo.feign.UserFeignClient;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

/**
 * @author qx
 * @date 2023/12/28
 * @des Feign测试
 */
@RestController
@RequestMapping("/userFeign")
public class UserFeignController {

    @Autowired
    private UserFeignClient userFeignClient;

    @GetMapping("/{id}")
    public User getUserInfo(@PathVariable("id") Long id) {
        return userFeignClient.selectUserById(id);
    }
}