一、创建步骤

模拟开发过程中的服务间关系。抽象出来，开发中的微服务之间的关系是生产者和消费者关系。

总目标：模拟一个最简单的服务调用场景，场景中保护微服务提供者(Producer)和微服务调用者(Consumer)，方便后面使用微服务架构

注意：每个微服务为一个独立的SpringBoot工程。

（1）创建一个新的Maven父工程

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（2）添加起步依赖坐标

<!--创建SpringBoot的父工程-->
<parent><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-parent</artifactId><version>2.1.6.RELEASE</version>
</parent><!--SpringBoot的依赖管理坐标-->
<dependencyManagement><dependencies><dependency><groupId>org.springframework.cloud</groupId><artifactId>spring-cloud-dependencies</artifactId><version>Greenwich.SR1</version><type>pom</type><scope>import</scope></dependency></dependencies>
</dependencyManagement>

二、在父工程下创建子模块

1.创建privider_service模块

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目录结构

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2.需要的依赖和配置文件application.yml

（1）依赖

<?xml version="1.0" encoding="UTF-8"?>
<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"><parent><artifactId>springCloud_parent</artifactId><groupId>com.william</groupId><version>1.0-SNAPSHOT</version></parent><modelVersion>4.0.0</modelVersion><artifactId>privider_service</artifactId><properties><maven.compiler.source>1.8</maven.compiler.source><maven.compiler.target>1.8</maven.compiler.target></properties><dependencies><!--web的依赖了--><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-web</artifactId></dependency><!--数据库的依赖--><dependency><groupId>mysql</groupId><artifactId>mysql-connector-java</artifactId></dependency><!--jpa依赖坐标--><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-data-jpa</artifactId></dependency></dependencies></project>

（2）配置文件application.yml

server:#服务的端口port: 9091
# DB 配置
spring:datasource:driver-class-name: com.mysql.cj.jdbc.Driverurl: jdbc:mysql://127.0.0.1:3306/springcloud?useUnicode=true&characterEncoding=UTF-8&serverTimezone=UTCpassword: rootusername: root

3.数据库的准备

（1）创建springcloud数据库

-- 创建数据库
CREATE database springcloud CHARACTER SET utf8 COLLATE utf8_general_ci;

（2）创建tb_user用户表

-- 使用springcloud数据库
USE springcloud;
-- ----------------------------
-- Table structure for tb_user
-- ----------------------------
CREATE TABLE `tb_user` (`id` int(11) NOT NULL AUTO_INCREMENT,`username` varchar(100) DEFAULT NULL COMMENT '用户名',`password` varchar(100) DEFAULT NULL COMMENT '密码',`name` varchar(100) DEFAULT NULL COMMENT '姓名',`age` int(11) DEFAULT NULL COMMENT '年龄',`sex` int(11) DEFAULT NULL COMMENT '性别，1男，2女',`birthday` date DEFAULT NULL COMMENT '出生日期',`created` date DEFAULT NULL COMMENT '创建时间',`updated` date DEFAULT NULL COMMENT '更新时间',`note` varchar(1000) DEFAULT NULL COMMENT '备注',PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=2 DEFAULT CHARSET=utf8 COMMENT='用户信息表';
-- ----------------------------
-- Records of tb_user
-- ----------------------------
INSERT INTO `tb_user` VALUES ('1', 'zhangsan', '123456', '张三', '13', '1', '2006-08-01', '2019-05-16', '2019-05-16', '张三');
INSERT INTO `tb_user` VALUES ('2', 'lisi', '123456', '李四', '13', '1', '2006-08-01', '2019-05-16', '2019-05-16', '李四');

4.domain层

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package com.itheima.domain;import javax.persistence.*;
import java.util.Date;@Entity
@Table(name = "tb_user")
public class User {@Id@GeneratedValue(strategy = GenerationType.IDENTITY)private Integer id;//主键idprivate String username;//用户名private String password;//密码private String name;//姓名private Integer age;//年龄private Integer sex;//性别 1男性，2女性private Date birthday; //出生日期private Date created; //创建时间private Date updated; //更新时间private String note;//备注@Overridepublic String toString() {return "User{" +"id=" + id +", username='" + username + '\'' +", password='" + password + '\'' +", name='" + name + '\'' +", age=" + age +", sex=" + sex +", birthday=" + birthday +", created=" + created +", updated=" + updated +", note='" + note + '\'' +'}';}public Integer getId() {return id;}public void setId(Integer id) {this.id = id;}public String getUsername() {return username;}public void setUsername(String username) {this.username = username;}public String getPassword() {return password;}public void setPassword(String password) {this.password = password;}public String getName() {return name;}public void setName(String name) {this.name = name;}public Integer getAge() {return age;}public void setAge(Integer age) {this.age = age;}public Integer getSex() {return sex;}public void setSex(Integer sex) {this.sex = sex;}public Date getBirthday() {return birthday;}public void setBirthday(Date birthday) {this.birthday = birthday;}public Date getCreated() {return created;}public void setCreated(Date created) {this.created = created;}public Date getUpdated() {return updated;}public void setUpdated(Date updated) {this.updated = updated;}public String getNote() {return note;}public void setNote(String note) {this.note = note;}
}

5.controller层

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package com.william.Controller;import com.william.domain.User;
import com.william.service.UserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;/*** @author ：lijunxuan* @date ：Created in 2019/6/29  10:09* @description ：* @version: 1.0*/
@RestController
@RequestMapping("/user")
public class UserController {@AutowiredUserService userService;@RequestMapping("findById")public User findById(Integer id){return userService.findById(id);}}

6.service层

（1）UserService接口

package com.william.service;import com.william.domain.User;public interface UserService {User findById(Integer id);}

（2）UserServiceImpl实现类

package com.william.service.Impl;import com.william.Dao.UserDao;
import com.william.domain.User;
import com.william.service.UserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;import java.util.Optional;/*** @author ：lijunxuan* @date ：Created in 2019/6/29  10:24* @description ：* @version: 1.0*/
@Service
public class UserServiceImpl implements UserService {@AutowiredUserDao userDao;@Overridepublic User findById(Integer id) {Optional<User> userfindById = userDao.findById(id);return userfindById.get();}
}

7.Dao层

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package com.william.Dao;import com.william.domain.User;
import org.springframework.data.jpa.repository.JpaRepository;
import org.springframework.stereotype.Repository;@Repository
public interface UserDao extends JpaRepository<User,Integer> {
}

8.ProviderServiceApplication

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package com.william;import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;/*** @author ：lijunxuan* @date ：Created in 2019/6/29  10:34* @description ：* @version: 1.0*/
@SpringBootApplication
public class ProviderServiceApplication {public static void main(String[] args) {SpringApplication.run(ProviderServiceApplication.class,args);}
}

9.测试结果

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2.consumer_service

（1）创建过程

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（2）导入依赖和目录结构

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<?xml version="1.0" encoding="UTF-8"?>
<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"><parent><artifactId>springCloud_parent</artifactId><groupId>com.william</groupId><version>1.0-SNAPSHOT</version></parent><modelVersion>4.0.0</modelVersion><artifactId>consumer_service</artifactId><properties><maven.compiler.source>1.8</maven.compiler.source><maven.compiler.target>1.8</maven.compiler.target></properties><dependencies><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-web</artifactId></dependency><!--热部署依赖--><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-devtools</artifactId></dependency></dependencies></project>

（3）application.yml

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server:port: 8080

（4）DemoApplication

package com.william;import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.annotation.Bean;
import org.springframework.web.client.RestTemplate;/*** @author ：lijunxuan* @date ：Created in 2019/6/29  9:53* @description ：* @version: 1.0*/
@SpringBootApplication
public class DemoApplication {public static void main(String[] args) {SpringApplication.run(DemoApplication.class,args);}//RestTemplate注入SPring容器当中@Beanpublic RestTemplate restTemplate(){return new RestTemplate();}
}

（5）ConsumerController

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package com.william.controller;import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.client.RestTemplate;/*** @author ：lijunxuan* @date ：Created in 2019/6/29  9:54* @description ：* @version: 1.0*/
@RestController
@RequestMapping("/consumer")
public class ConsumerController {@AutowiredRestTemplate restTemplate;@RequestMapping("/findUser")public String findUser(Integer id){//请求服务提供者的查询用户详情地址// String url="http://localhost:9091/user/findById?id="+id;alt+enter  找到formatString url= String.format("http://localhost:9091/user/findById?id=%d", id);return restTemplate.getForObject(url,String.class);}}