简介
Spring Cloud大型企业分布式微服务云构建的B2B2C电子商务平台源码请加企鹅求求：一零三八七七四六二六。上一节，我们讨论了怎么通过，restTemlate调用cloud的生产者，实现起来还是比较复杂的，尤其是在消费复杂的Restful服务的时候，还需要进行一系列的转换，编解码等，使用Feign就完全不用考虑这个问题.。
一、feinn介绍
Feign是一种声明式、模板化的HTTP客户端。在Spring Cloud中使用Feign, 我们可以做到使用HTTP请求远程服务时能与调用本地方法一样的编码体验，开发者完全感知不到这是远程方法，更感知不到这是个HTTP请求，这整个调用过程和Dubbo的RPC非常类似。开发起来非常的优雅。
二、创建模块（microservice-consumer-movie-feign）
项目结构如下：
三、pom.xml
microservice-spring-cloud com.jacky 1.0-SNAPSHOT 4.0.0 microservice-consumer-movie-feign jar UTF-8 UTF-8 1.8 org.springframework.boot spring-boot-starter-web org.springframework.cloud spring-cloud-starter-eureka org.springframework.boot spring-boot-starter-actuator org.springframework.cloud spring-cloud-starter-feign com.spotify docker-maven-plugin build-image install build http://192.168.6.130:5678 true ${docker.repostory}/${docker.image.prefix}/${project.artifactId}:${project.version} java:openjdk-8-jdk-alpine ["java", "-jar", "/${project.build.finalName}.jar"] / ${project.build.directory} ${project.build.finalName}.jar
四、配置文件application.yml
spring: application: name: microservice-consumer-movie-feignserver: port: 7901eureka: client: healthcheck: enabled: true serviceUrl: defaultZone: http://jacky:admin@peer1:8761/eureka/,http://jacky:admin@peer2:8762/eureka/,http://jacky:admin@peer3:8763/eureka/ instance: prefer-ip-address: true instance-id: ${spring.application.name}:${spring.cloud.client.ipAddress}:${spring.application.instance_id:${server.port}} 五、MovieController.java
package com.jacky.cloud.controller;import com.jacky.cloud.entity.User;import com.jacky.cloud.feign.UserFeignClient;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.beans.factory.annotation.Value;import org.springframework.web.bind.annotation.GetMapping;import org.springframework.web.bind.annotation.PathVariable;import org.springframework.web.bind.annotation.RestController;import org.springframework.web.client.RestTemplate;/** * Created by jacky on 2017/7/14. */@RestControllerpublic class MovieController { @Autowired private UserFeignClient userFeignClient; @GetMapping("/movie/{id}") public User findById(@PathVariable Long id) { return this.userFeignClient.findById(id); } @GetMapping("/test") public User testPost(User user) { return this.userFeignClient.postUser(user); } @GetMapping("/test-get") public User testGet(User user) { return this.userFeignClient.getUser(user); }} 六、实体类User.java
package com.jacky.cloud.entity;import java.math.BigDecimal;public class User { private Long id; private String username; private String name; private Short age; private BigDecimal balance; public Long getId() { return this.id; } public void setId(Long id) { this.id = id; } public String getUsername() { return this.username; } public void setUsername(String username) { this.username = username; } public String getName() { return this.name; } public void setName(String name) { this.name = name; } public Short getAge() { return this.age; } public void setAge(Short age) { this.age = age; } public BigDecimal getBalance() { return this.balance; } public void setBalance(BigDecimal balance) { this.balance = balance; }} 七、UserFeignClient.java
package com.jacky.cloud.feign;import com.jacky.cloud.entity.User;import org.springframework.cloud.netflix.feign.FeignClient;import org.springframework.web.bind.annotation.PathVariable;import org.springframework.web.bind.annotation.RequestBody;import org.springframework.web.bind.annotation.RequestMapping;import org.springframework.web.bind.annotation.RequestMethod;/** * Created by jacky on 2017/7/14. */@FeignClient("microservice-provider-user")public interface UserFeignClient { /** * 根据Id获得User * 两个坑：1. @GetMapping不支持 2. @PathVariable得设置value * @param id * @return */ @RequestMapping(value = "/simple/{id}", method = RequestMethod.GET) public User findById(@PathVariable("id") Long id); @RequestMapping(value = "/user", method = RequestMethod.POST) public User postUser(@RequestBody User user); // 该请求不会成功，只要参数是复杂对象，即使指定了是GET方法，feign依然会以POST方法进行发送请求。可能是我没找到相应的注解或使用方法错误。 // 也就是说复杂对象，feign一定要post的请求方式 @RequestMapping(value = "/get-user", method = RequestMethod.GET) public User getUser(User user);} 八、启动类(MicroserviceSimpleConsumerMovieApplication.java)
package com.jacky.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;import org.springframework.context.annotation.Bean;import org.springframework.web.client.RestTemplate;@SpringBootApplication@EnableEurekaClient@EnableFeignClientspublic class MicroserviceSimpleConsumerMovieApplication { public static void main(String[] args) { SpringApplication.run(MicroserviceSimpleConsumerMovieApplication.class, args); }} 需要JAVASpring Cloud大型企业分布式微服务云构建的B2B2C电子商务平台源码请加企鹅求求：一零三八七七四六二六
标签：springcloud,spring cloud,springcloud微服务,b2b2c,o2o电子商务,java多用户商城系统