Java B2B2C o2o多用户商城 springcloud架构-docker-feign(四)-白红宇

简介

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.。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

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
            
           
                         
                    
               
          
     
    复制代码

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}}复制代码

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);    }}复制代码

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;  }}复制代码

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);}复制代码

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);  }}复制代码

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