互联网技术-Alibaba-nacos-远程服务调用-使用技术feign

• RestTemplate和WebClient都是Spring自己封装的工具

• Feign 是 Spring Cloud 的成员

• Spring Cloud Alibaba 支持对Feign的调用

• 1.需要在消费方consumer项目的pom文件中添加对应的坐标

• 2.需要建立feign对应的接口,在接口中书写provider也就是数据提供方中controller层中对应的方法请求:如下:

  3.编写测试的controller,在里面调用接口中定义的方法即可进行远程调用

  4.最后切记在项目启动类上加上对应的注解

   

consumer的pom坐标

        
        
            org.springframework.boot
            spring-boot-starter-web
        
        
        
            org.apache.httpcomponents
            httpclient
            4.5.6
        
        
        
            org.projectlombok
            lombok
        
        
        
            com.alibaba
            fastjson
            1.2.49
        
        
        
            org.springframework.boot
            spring-boot-starter-test
        

        
        
            io.springfox
            springfox-swagger2
        
        
            io.springfox
            springfox-swagger-ui
        

        
        
            com.alibaba.cloud
            spring-cloud-starter-alibaba-nacos-discovery
        

        
        
            org.springframework.boot
            spring-boot-starter-webflux
        


        
            org.springframework.cloud
            spring-cloud-starter-openfeign
        
    

接口feign

package com.czxy.feign;

import com.czxy.domain.User;
import org.springframework.cloud.openfeign.FeignClient;
import org.springframework.web.bind.annotation.*;

import java.util.List;

//远程服务器名 和短路径
@FeignClient(value = "user-service",path = "/user")
public interface UserControllerFeign {

    @GetMapping("/findAll")
    public List findAll();

    @PostMapping("/add")
    public String save(@RequestBody User user);


    @PutMapping("/update")
    public String update(@RequestBody User user);

    @DeleteMapping("/del/{id}")
    public String delete(@PathVariable("id") Integer id);

    @PostMapping("/findByCondition")
    public List findByCondition(@RequestBody User user);
}

controller:

package com.czxy.controller;

import com.czxy.domain.User;
import com.czxy.feign.UserControllerFeign;
import org.springframework.web.bind.annotation.*;

import javax.annotation.Resource;
import java.util.List;

@RestController
@RequestMapping("/feign")
public class TestFeignController {

    //feign对象调用
    @Resource
    private UserControllerFeign userControllerFeign;

    @GetMapping("/findAll")
    public List findAll(){
        return userControllerFeign.findAll();
    }

    @PostMapping("/add")
    public String save(@RequestBody User user){
        return userControllerFeign.save(user);
    }

    @PutMapping("/update")
    public String update(@RequestBody User user){
        return userControllerFeign.update(user);
    }


    @DeleteMapping("/del/{id}")
    public String delete(@PathVariable("id") Integer id){
        return userControllerFeign.delete(id);
    }

    @PostMapping("/findByCondition")
    public List findByCondition(@RequestBody User user){
        return userControllerFeign.findByCondition(user);
    }
}

项目启动类:

package com.czxy;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.client.discovery.EnableDiscoveryClient;
import org.springframework.cloud.openfeign.EnableFeignClients;
import org.springframework.web.reactive.config.EnableWebFlux;

@SpringBootApplication
@EnableDiscoveryClient
@EnableFeignClients//feign远程调用
public class CompanyHttpApplication {
    public static void main(String[] args) {
        SpringApplication.run(CompanyHttpApplication.class,args);
    }
}