原创

8.Springcloud的Feign嵌入Ribbon实现接口式调用(改变restTemplate和Ribbon的调用方式)

项目地址:

github地址

1.在公共引用项目debugggcloud_api项目加入引用Feign的支持

        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-feign</artifactId>
        </dependency>

2.在消费者项目里面加入该引用

        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-feign</artifactId>
        </dependency>

3.在公共引用项目创建DeptClientService接口类

package com.debuggg.cloud.service;

import com.debuggg.cloud.entities.Dept;
import org.springframework.cloud.netflix.feign.FeignClient;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;

import java.util.List;

@FeignClient(value = "DEBUGGGCLOUD-DEPT")
public interface DeptClientService {
    @RequestMapping(value = "/dept/get/{id}",method = RequestMethod.GET)
    public Dept get(@PathVariable("id") long id);

    @RequestMapping(value = "/dept/list",method = RequestMethod.GET)
    public List<Dept> list();

    @RequestMapping(value = "/dept/add",method = RequestMethod.POST)
    public boolean add(Dept dept);
}

注意接口上面的@FeignClient(value="DEBUGGGCLOUD-DEPT"),此处需要该注解

4.将消费者项目里面的DeptConsumerController的代码的调用方式由RestTemplate的调用方式修改为DeptClientService调用方式调用

原来代码:

package com.debuggg.cloud.controller;

import com.debuggg.cloud.entities.Dept;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.client.RestTemplate;

import java.util.List;

@RestController
public class DeptConsumerController {

//    private static final String PREFIX = "http://localhost:8001/";
    private static final String PREFIX = "http://DEBUGGGCLOUD-DEPT";

    @Autowired
    private RestTemplate restTemplate;

    @RequestMapping(value = "/consumer/dept/list")
    public List<Dept> list(){
        return restTemplate.getForObject(PREFIX + "/dept/list", List.class);
    }

    @RequestMapping(value = "/consumer/dept/get/{id}")
    public Dept get(@PathVariable("id") Long id){
        return restTemplate.getForObject(PREFIX + "/dept/get/" + id, Dept.class);
    }

    @RequestMapping(value = "/consumer/dept/add")
    public Boolean add(Dept dept){
        return restTemplate.postForObject(PREFIX + "/dept/add" ,dept, Boolean.class);
    }


    //测试@EnableDiscoveryClient,消费端可以调用服务发现
    @RequestMapping(value="/consumer/dept/discovery")
    public Object discovery()
    {
        return restTemplate.getForObject(PREFIX+"/dept/discovery", Object.class);
    }
}

修改后代码:

package com.debuggg.cloud.controller;

import com.debuggg.cloud.entities.Dept;
import com.debuggg.cloud.service.DeptClientService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.client.RestTemplate;

import java.util.List;

@RestController
public class DeptConsumerController {

    @Autowired
    private DeptClientService service = null;

    @RequestMapping(value = "/consumer/dept/list")
    public List<Dept> list(){
        return this.service.list();
    }

    @RequestMapping(value = "/consumer/dept/get/{id}")
    public Dept get(@PathVariable("id") Long id){
        return this.service.get(id);
    }

    @RequestMapping(value = "/consumer/dept/add")
    public Boolean add(Dept dept){
        return this.service.add(dept);
    }
}

5.在启动类加入注解@EnableFeignClients

package com.debuggg.cloud;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.netflix.eureka.EnableEurekaClient;
import org.springframework.cloud.netflix.feign.EnableFeignClients;

@SpringBootApplication
@EnableEurekaClient
@EnableFeignClients(basePackages= {"com.debuggg.cloud"})
public class DeptConsumer10001_App {
    public static void main(String[] args) {
        SpringApplication.run(DeptConsumer10001_App.class,args);
    }
}

启动测试

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