SpringCloud2.0基于Feign父子工程

SpringCloud2.0基于Feign父子工程

• 项目结构
  ——springcloud-2.0-dawn-eureka-server — jar
  ——springcloud-2.0-dawn-parent —pom
  ————springcloud2.0-dawn-api-service —pom
  ——————springcloud2.0-dawn-api-member-service —jar
  ——————springcloud2.0-dawn-api-order-service —jar
  ————springcloud2.0-dawn-api-member-service-impl —jar
  ————springcloud2.0-dawn-api-order-service-impl —jar
• springcloud-2.0-dawn-eureka-server
  maven

<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>

application.yml

###服务端口号
server:
  port: 8100
###eureka 基本信息配置
eureka:
  instance:
    ###注册到eurekaip地址
    hostname: 127.0.0.1
  client:
    serviceUrl:
      defaultZone: http://${eureka.instance.hostname}:${server.port}/eureka/
###因为自己是为注册中心，不需要自己注册自己
    register-with-eureka: false
###因为自己是为注册中心，不需要检索服务
    fetch-registry: false

启动Eureka服务

@EnableEurekaServer
@SpringBootApplication
public class AppEureka {

	public static void main(String[] args) {
		SpringApplication.run(AppEureka.class, args);
	}

}

• springcloud-2.0-dawn-parent
  maven

<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>
		<!-- SpringBoot整合Web组件 -->
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-web</artifactId>
		</dependency>
		<!-- SpringBoot整合eureka客户端 -->
		<dependency>
			<groupId>org.springframework.cloud</groupId>
			<artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
		</dependency>
		<!-- SpringBoot整合fegnin客户端 -->
		<dependency>
			<groupId>org.springframework.cloud</groupId>
			<artifactId>spring-cloud-starter-openfeign</artifactId>
		</dependency>
		<dependency>
			<groupId>org.projectlombok</groupId>
			<artifactId>lombok</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>

• springcloud2.0-dawn-api-service
• springcloud2.0-dawn-api-member-service
  实体类 com.dawn.api.entity UserEntity

public class UserEntity {
	
	private String name;
	
	private String age;

	public String getName() {
		return name;
	}

	public void setName(String name) {
		this.name = name;
	}

	public String getAge() {
		return age;
	}

	public void setAge(String age) {
		this.age = age;
	}

	@Override
	public String toString() {
		return "UserEntity [name=" + name + ", age=" + age + "]";
	}
	
}

会员服务接口 com.dawn.api.service IMemberService

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

import com.dawn.api.entity.UserEntity;

public interface IMemberService {
	
	@RequestMapping("/getMember")
	public UserEntity getMember(@RequestParam("name")String name);
}

• springcloud2.0-dawn-api-order-service
  订单服务接口 com.dawn.api.service IOrderService

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

public interface IOrderService {

	//订单服务调用会员服务接口信息
	@RequestMapping("/orderToMember")
	public String orderToMember(String name);
}

• springcloud2.0-dawn-api-member-service-impl
  maven

  <dependencies>
  	<dependency>
	  	<groupId>com.dawn</groupId>
	   	<artifactId>springcloud2.0-dawn-api-member-service</artifactId>
	    <version>0.0.1-SNAPSHOT</version>
  	</dependency>
  </dependencies>

会员服务接口实现类 com.dawn.service.impl MemberServiceImpl

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

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

@RestController
public class MemberServiceImpl implements IMemberService {

	@RequestMapping("/getMember")
	public UserEntity getMember(@RequestParam String name) {
		UserEntity userEntity = new UserEntity();
		userEntity.setName(name);
		userEntity.setAge("20");
		return userEntity;
	}

}

启动类 com.dawn

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

• springcloud2.0-dawn-api-order-service-impl
  maven

<dependencies>
  
  	<dependency>
	  	<groupId>com.dawn</groupId>
	    <artifactId>springcloud2.0-dawn-api-order-service</artifactId>
	    <version>0.0.1-SNAPSHOT</version>
  	</dependency>
  	
  	<dependency>
	  	<groupId>com.dawn</groupId>
	    <artifactId>springcloud2.0-dawn-api-member-service</artifactId>
	    <version>0.0.1-SNAPSHOT</version>
  	</dependency>
  	
  </dependencies>

application.yml

###服务启动端口号
server:
  port: 8020
###服务名称(服务注册到eureka名称)  
spring:
    application:
        name: app-dawn-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

Fegin 接口com.dawn.api.feign

import org.springframework.cloud.openfeign.FeignClient;

import com.dawn.api.service.IMemberService;

@FeignClient("app-dawn-member")
public interface MemberServiceFegin extends IMemberService{
	//服务降级  熔断
	//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
	//代码实现存放在接口实现类中
}

订单服务实现接口 com.dawn.api.service.impl

@RestController
public class OrderServiceImpl implements IOrderService{
	//订单服务继承会员服务接口，用来实现feign客户端  减少重复接口代码
	@Autowired
	private MemberServiceFegin memberServiceFegin;
	
	@RequestMapping("/orderToMember")
	public String orderToMember(String name) {
		UserEntity user = memberServiceFegin.getMember(name);
		return user==null?"没有找到用户信息":user.toString();
	}

}

启动类 com.dawn.api

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