第一个feign程序
1.搭建Eureka server（之前的文章里有）
2.创建服务提供者（之前的文章里有）
在服务提供者中eureka-provider中创建controller包,controller包下定义controller类（eureka-provider->controller包->controller类）
package com.example.eurekaprovider.controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RestController;
@RestController
public class HelloController {
@RequestMapping(value = "/hello",method = RequestMethod.GET)
public String sayHello() {
return "hello Feign";
}
}
3.创建feign
第一步：使用IDEA创建一个名称为eureka-feign-client的Spring Boot项目，添加eureka Client、web和feign依赖
第二步：添加配置信息
在全局配置文件application.yml中添加feign的配置信息
spring:
application:
name: eureka-feign-client
server:
port: 8764
eureka:
client:
service-url:
defaultZone: http://localhost:7000/eureka/
第三步：添加注解
在项目启动类EurekaFeginClientApplication上添加@EnableEurekaClient注解，开启EurekaClient功能，添加EurekaFeignClient注解，开启FeignClient功能
package com.itheima.eurekafeignclient;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.netflix.eureka.EnableEurekaClient;
import org.springframework.cloud.openfeign.EnableFeignClients;
@EnableEurekaClient
@EnableFeignClients
@SpringBootApplication
public class EurekaFeignClientApplication {
public static void main(String[] args) {
SpringApplication.run(EurekaFeignClientApplication.class, args);
}
}
第四步：创建service包和和controller包
1.在eureka-feign-client中创建service包,并创建接口FeignService（eureka-feign-client->service包->FeignService接口）
package com.itheima.eurekafeignclient;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.netflix.eureka.EnableEurekaClient;
import org.springframework.cloud.openfeign.EnableFeignClients;
@EnableEurekaClient
@EnableFeignClients
@SpringBootApplication
public class EurekaFeignClientApplication {
public static void main(String[] args) {
SpringApplication.run(EurekaFeignClientApplication.class, args);
}
}
2.在eureka-feign-client中创建controller包,并创建FeignController类，并定义hello()方法调用FeignService的sayHello()方法（eureka-feign-client->controller包->FeignController类->hello()）
package com.itheima.eurekafeignclient.controller;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RestController;
import com.itheima.eurekafeignclient.service.FeignService;
@RestController
public class FeignController {
@Autowired
FeignService feignService;
@RequestMapping(value = "/hello",method = RequestMethod.GET)
public String hello() {
return feignService.sayHello();
}
}
测试结果：
