SpringCloud调研系列2.2：服务发现-Feign-优快云博客

2019独角兽企业重金招聘Python工程师标准>>>

http://blog.didispace.com/springcloud2/

之前，我们写了一个基于Ribbon的负载均衡例子，下面我们来研究基于Feign的例子。

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Spring Cloud为Feign增加了对Spring MVC注解的支持，还整合了Ribbon和Eureka来提供均衡负载的HTTP客户端实现。

创建一个新的maven工程，具体过程略。

pom.xml添加

<parent>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-parent</artifactId>
    <version>1.3.5.RELEASE</version>
    <relativePath/> <!-- lookup parent from repository -->
</parent>
<dependencies>
    <dependency>
        <groupId>org.springframework.cloud</groupId>
        <artifactId>spring-cloud-starter-feign</artifactId>
    </dependency>
    <dependency>
        <groupId>org.springframework.cloud</groupId>
        <artifactId>spring-cloud-starter-eureka</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>Brixton.RELEASE</version>
	    <type>pom</type>
	    <scope>import</scope>
	</dependency>
    </dependencies>
</dependencyManagement>

主类

package i.a.c;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.client.discovery.EnableDiscoveryClient;
import org.springframework.cloud.netflix.feign.EnableFeignClients;

@SpringBootApplication
@EnableDiscoveryClient
@EnableFeignClients
public class FeignApplication {
	public static void main(String[] args) {
		SpringApplication.run(FeignApplication.class, args);
	}
}

定义业务接口文件

package i.a.inter;

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;

@FeignClient("compute-service")
public interface ComputeClient {
	@RequestMapping(method = RequestMethod.GET, value = "/add")
	Integer add(@RequestParam(value = "a") Integer a, @RequestParam(value = "b") Integer b);
}

定义业务实现文件

package i.a.imple;

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 i.a.inter.ComputeClient;

@RestController
public class ConsumerController {
	@Autowired
	ComputeClient computeClient;

	@RequestMapping(value = "/add", method = RequestMethod.GET)
	public Integer add() {
		return computeClient.add(10, 20);
	}
}

application.properties文件中添加

spring.application.name=feign-consumer
server.port=5555
eureka.client.serviceUrl.defaultZone=http://localhost:1112/eureka/

然后访问http://localhost:5555 访问2次，查看效果。

转载于:https://my.oschina.net/qiangzigege/blog/798495