Feign的使用

一.先配置Feign接口

 1.1 在core包中導入須要的jar

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

1.2 在包中編寫接口類

package com.shi.core.service;

import java.util.List;

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 com.shi.core.model.Dept;

@FeignClient(value = "SPRINGCLOUD04-PRODECT-8001") //指定爲哪一個微服務提供接口
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);
}

二.在服務消費方配置Feign信息

2.1 導入須要的jar

<!-- feign -->
		<dependency>
			<groupId>org.springframework.cloud</groupId>
			<artifactId>spring-cloud-starter-feign</artifactId>
		</dependency>       
        <!-- Ribbon相關 （ribbon須要和eureka配合使用） -->
		<dependency>
			<groupId>org.springframework.cloud</groupId>
			<artifactId>spring-cloud-starter-eureka</artifactId>
		</dependency>
		<dependency>
			<groupId>org.springframework.cloud</groupId>
			<artifactId>spring-cloud-starter-ribbon</artifactId>
		</dependency>
		<dependency>
			<groupId>org.springframework.cloud</groupId>
			<artifactId>spring-cloud-starter-config</artifactId>
		</dependency>

2 編寫Controller

package com.shi.customer.controller;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.ResponseBody;

import com.shi.core.model.Dept;
import com.shi.core.service.DeptClientService;

@Controller
public class DeptController {
	
	@Autowired
	private DeptClientService deptClientService;
	
	@GetMapping("/consumer/dept/add")
	@ResponseBody
	public boolean add(Dept dept) {
		return deptClientService.add(dept);
	}
	
	@GetMapping("/consumer/dept/get/{id}")
	@ResponseBody
	public Object get(@PathVariable("id") Integer id) {
		return deptClientService.get(id);
	}
	
	@GetMapping("/consumer/dept/list")
	@ResponseBody
	public Object list(){
		Object list = deptClientService.list();
		return list;
	}
	
}

3.在啓動類上面配置相應的註解

package com.shi.customer;

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;
import org.springframework.cloud.netflix.ribbon.RibbonClient;
import org.springframework.context.annotation.ComponentScan;


@SpringBootApplication
@EnableEurekaClient
@EnableFeignClients(basePackages= {"com.shi.core.service"})//feign服務類的包名
public class Customer7001Feign {

	public static void main(String[] args) {
		SpringApplication.run(Customer7001Feign.class, args);
	}

}