Spring Cloud之Feigin客户端重构思想

应该重构接口信息(重点) 

toov5-parent  存放共同依赖信息

 toov5-api       api的只有接口没有实现

  toov5-api-member   

  toov5-api-order

too5-member-impl   api接口的实现

toov5-order-impl

1、 创建 parent的 pom工程

2、 点击parent创建maven model   的 service   pom    

3、 点击 service 创建两个 api-service 的jar

4、点击parent创建 两个 两个接口的实现 jar

实体类 是单独建立一个项目 实体类存放在接口下面 接口可能会被别人调用 其他核心代码就别写到这里了 实体类还是可以的
代码是吸纳存放在接口实现类里面

依赖jar 放在parent

定义member 接口 和涉及到的 实体类

这里面的核心 订单服务调用会员服务接口,用来实现feign客户端 ,减少重复代码

Eureka server:

 pom:

<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>com.toov5</groupId>
  <artifactId>SpringCloud-eureka-server</artifactId>
  <version>0.0.1-SNAPSHOT</version>
  <parent>
		<groupId>org.springframework.boot</groupId>
		<artifactId>spring-boot-starter-parent</artifactId>
		<version>2.0.1.RELEASE</version>
	</parent>
	<!-- 管理依赖 -->
	<dependencyManagement>
		<dependencies>
			<dependency>
				<groupId>org.springframework.cloud</groupId>
				<artifactId>spring-cloud-dependencies</artifactId>
				<version>Finchley.M7</version>
				<type>pom</type>
				<scope>import</scope>
			</dependency>
		</dependencies>
	</dependencyManagement>
	<dependencies>
		<!--SpringCloud eureka-server -->
		<dependency>
			<groupId>org.springframework.cloud</groupId>
			<artifactId>spring-cloud-starter-netflix-eureka-server</artifactId>
		</dependency>
	</dependencies> 
	<!-- 注意: 这里必须要添加, 否者各种依赖有问题 -->
	<repositories>
		<repository>
			<id>spring-milestones</id>
			<name>Spring Milestones</name>
			<url>https://repo.spring.io/libs-milestone</url>
			<snapshots>
				<enabled>false</enabled>
			</snapshots>
		</repository>
	</repositories>
  
</project>

  yml:

###eureka 服务端口号
server:
  port: 8100
###服务注册名称
eureka:
  instance:
  ##注册中心ip地址
    hostname: 127.0.0.1
###客户端调用地址
  client:
    serviceUrl:
      defaultZone: http://${eureka.instance.hostname}:${server.port}/eureka/
###因为该应用为注册中心,不会注册自己 (集群设为true)
    register-with-eureka: false
###因为自己为注册中心 ,不会去在该应用中的检测服务 
    fetch-registry: false

启动类:

package com.toov5;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.netflix.eureka.server.EnableEurekaServer;


@EnableEurekaServer   //开启注册中心
@SpringBootApplication 
public class AppEureka {
  
     public static void main(String[] args) {
           SpringApplication.run(AppEureka.class, args);
    }
    
}

业务逻辑部分:

其中service 是个pom文件 包括两个model : member service  和 order service 两个接口

实现类分别是   member service  impl 和  order service

service 接口项目聚合:

Member:

entity:

package com.toov5.api.entity;

import lombok.Data;

@Data
public class UserEntity {
    private String name;
    private Integer age;
   
}

service接口:

package com.toov5.api.service;

import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;

import com.toov5.api.entity.UserEntity;

@RestController
public interface IMemberService {
 
    @RequestMapping("/getMember")  //接口加@RequestMapping 被其他项目调用时候 feign客户端可以继承
    public UserEntity getMember(@RequestParam("name") String name);
    
}

实现:

 pom:

<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>
  <parent>
    <groupId>com.toov5</groupId>
    <artifactId>parent</artifactId>
    <version>0.0.1-SNAPSHOT</version>
  </parent>
  <artifactId>toov5-api-member-service-impl</artifactId>
  
  	<dependencies> 
  	 	<dependency>
  	 	  <groupId>com.toov5</groupId>
           <artifactId>toov5-api-member-service</artifactId>
             <version>0.0.1-SNAPSHOT</version>
  	 	</dependency>	
  	 	<dependency>
  	 	  <groupId>com.toov5</groupId>
            <artifactId>toov5-api-order-service</artifactId>
             <version>0.0.1-SNAPSHOT</version>
  	 	</dependency>	 	
  	</dependencies>
  
</project>

  实现:

package com.toov5.api.service.impl;

import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;

import com.toov5.api.entity.UserEntity;
import com.toov5.api.service.IMemberService;

   //注意加在实现类上面!!! 接口不能加 接口不能被实例化
@RestController
public class MemberServiceImpl implements IMemberService { @RequestMapping("/getMember") public UserEntity getMember(@RequestParam("name") String name) { UserEntity userEntity = new UserEntity(); userEntity.setName(name); userEntity.setAge(10); return userEntity; } }

启动类:

package com.toov5.api.service.impl;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.netflix.eureka.EnableEurekaClient;
import org.springframework.cloud.openfeign.EnableFeignClients;

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

Order:

接口类:

package com.toov5.api.service;

import org.springframework.web.bind.annotation.RequestMapping;

public interface IOrderService {
   //订单服务带哦用会员服务接口信息fegin
    @RequestMapping("/orderToMember")
    public String orderToMember(String name);
}

实现:

 Feign: 通过继承 减少代码

package com.toov5.api.feign;

import org.springframework.cloud.openfeign.FeignClient;

import com.toov5.api.service.IMemberService;
//避免了冗余代码 直接过来就ok了
@FeignClient("app-toov5-member")
public interface MemberServiceFeign extends IMemberService {
   //实体类是存放接口项目还是存放在实现项目 实体类存放在接口项目里面
    //实体类和定义接口信息存放在接口项目
    //代码实现放在接口实现类里面
}
package com.toov5.api.service.impl;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

import com.toov5.api.entity.UserEntity;
import com.toov5.api.feign.MemberServiceFeign;
import com.toov5.api.service.IOrderService;

@RestController
public class OrderServiceImpl implements IOrderService {
        @Autowired
      private MemberServiceFeign memberServiceFeign; 
    
      @RequestMapping("orderToMmeber")
      public String orderToMember(String name) {
      UserEntity user = memberServiceFeign.getMember(name);
        return  user==null ? "没有找到用户先关信息" : user.toString();
    }
}
 
package com.toov5.api;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.netflix.eureka.EnableEurekaClient;
import org.springframework.cloud.openfeign.EnableFeignClients;

@SpringBootApplication(scanBasePackages={"com.toov5.*"})
@EnableEurekaClient
@EnableFeignClients
public class AppOrder {
   public static void main(String[] args) {
    SpringApplication.run(AppOrder.class, args);
}
}

yml:

###服务启动端口号
server:
  port: 8001
###服务名称(服务注册到eureka名称)  
spring:
    application:
        name: app-toov5-order
###服务注册到eureka地址
eureka:
  client:
    service-url:
           defaultZone: http://localhost:8100/eureka

           
###因为该应用为注册中心,不会注册自己
    register-with-eureka: true
###是否需要从eureka上获取注册信息
    fetch-registry: true

  都启动后:

访问订单接口

按照这个规范目录去做 尤其@FeignClient要写到客户端里面 方便做服务降级

Feign默认开启的本地负载均衡~

原文地址:https://www.cnblogs.com/toov5/p/9955832.html