Spring cloud的消费方式（Feign）

【第二种通过Feign】

1.需要单独建立一个接口，接口上通过@ FeignClient（“服务名”）注解来调用指定的服务。接口中编写一个方法，该方法提供的接口就是我们需要调用的服务的接口名。同时如果我们需要调用的服务的那个接口是需要传参的，那么这个方法我们也需要传入参数。

2.在启动类上加注解@EnableFeignClients 来开启Feign的功能。

3.提供接口，暴露服务。

步骤一：编写配置文件

eureka:
  client:
    serviceUrl: 
      defaultZone: http://localhost:10001/eureka/
server:
  port: 8085
spring:
   application:
     name: service-feign

步骤二：建立接口

package com.cloud.interfac;

import org.springframework.cloud.netflix.feign.FeignClient;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RequestParam;

 //调用了service-hello服务的“/hello”接口

@FeignClient(value="service-hello")
public interface SchedualServiceHello {
	    @RequestMapping(value="/hello",method=RequestMethod.GET)
        String sayHelloFromClientOne(@RequestParam(value="name")String name);
}

步骤三：在启动类上加注解@EnableFeignClients 来开启Feign的功能。

@SpringBootApplication
@EnableDiscoveryClient	
@EnableFeignClients
public class ServiceFeignApplication {
         public static void main(String[] args) {
			SpringApplication.run(ServiceFeignApplication.class, args);
			System.out.println("*******Feign  已开启************");
		}
         
}

步骤四：提供接口，暴露服务。

package com.cloud.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.RequestParam;
import org.springframework.web.bind.annotation.RestController;

import com.cloud.interfac.SchedualServiceHello;

@RestController
public class HelloController {
  
	@Autowired
	SchedualServiceHello schedualServiceHello;
	
	@RequestMapping(value="/hello",method=RequestMethod.GET)
	public String hello(@RequestParam String name) {
		return schedualServiceHello.sayHelloFromClientOne(name);
	}
}

看一下pom文件中的依赖：

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
  <modelVersion>4.0.0</modelVersion>
  <groupId>springcloud-service-feign</groupId>
  <artifactId>springcloud-service-feign</artifactId>
  <version>0.0.1-SNAPSHOT</version>
  
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>1.5.2.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    
    <dependencies>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-eureka</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-feign</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
    </dependencies>
    
    <dependencyManagement>
	    <dependencies>
	        <dependency>
	            <groupId>org.springframework.cloud</groupId>
	            <artifactId>spring-cloud-dependencies</artifactId>
	            <version>Camden.SR6</version>
	            <type>pom</type>
	            <scope>import</scope>
	        </dependency>
	    </dependencies>
   </dependencyManagement>
    
</project>

Spring cloud的消费方式（Feign）

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