作者：因情语写

链接：https://www.proprogrammar.com/article/648

声明：请尊重原作者的劳动，如需转载请注明出处

先给出文章中涉及的项目的完整代码

microservicecloud.zip

总体介绍

承接着我们的springmvc+mybatis+mysql初级高级课程，以Dept部门模块做一个微服务通用案例Consumer消费者（Client）通过REST调用Provider提供者（Server）提供的服务

Maven的分包分模块架构复习

一个简单的Maven模块结构是这样的：

---- app-parent      一个父项目(app-parent)聚合很多子项目(app-util,app-dao,app-service,app-web)
      |---- pom.xml (pom)
      |
      |-------- app-util
      | |-------- pom.xml (jar)
      |
      |-------- app-dao
      | |-------- pom.xml (jar)
      |
      |-------- app-service
      | |-------- pom.xml (jar)
      |
      |-------- app-web
        |-------- pom.xml (war) 

一个Project带着多个Module子模块

MicroServiceCloud父工程（Project）下初次带着3个子模块（Module）

microservicecloud-api

封装的整体Entity/接口/公共配置等

microservicecloud-provider-dept-8001

微服务落地的服务提供者

microservicecloud-consumer-dept-80

微服务调用的客户端使用

80端口

80端口是为HTTP(HyperText Transport Protocol)即超文本传输协议开放的
此为上网冲浪使用次数最多的协议，主要用于WWW(World Wide Web)即万维网传输信息的协议。
 
可以通过HTTP地址(即常说的"网址")加":80"来访问网站，
 
因为浏览网页服务默认的端口号都是80，因此只需输入网址即可，不用输入":80"了。

直接动手干

本次springCloud版本

构建步骤

microservicecloud整体父工程Project

新建父工程microservicecloud，切记是Packageing是pom模式

主要是定义POM文件，将后续各个子模块公用的jar包等统一提出来，类似一个抽象父类

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.atguigu.springcloud</groupId>
  <artifactId>microservicecloud</artifactId>
  <version>0.0.1-SNAPSHOT</version>
  <packaging>pom</packaging>
 
 
  <properties>
   <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
   <maven.compiler.source>1.8</maven.compiler.source>
   <maven.compiler.target>1.8</maven.compiler.target>
   <junit.version>4.12</junit.version>
   <log4j.version>1.2.17</log4j.version>
   <lombok.version>1.16.18</lombok.version>
  </properties>
 
  <dependencyManagement>
   <dependencies>
     <dependency>
       <groupId>org.springframework.cloud</groupId>
       <artifactId>spring-cloud-dependencies</artifactId>
       <version>Dalston.SR1</version>
       <type>pom</type>
       <scope>import</scope>
     </dependency>
     <dependency>
       <groupId>org.springframework.boot</groupId>
       <artifactId>spring-boot-dependencies</artifactId>
       <version>1.5.9.RELEASE</version>
       <type>pom</type>
       <scope>import</scope>
     </dependency>
     <dependency>
       <groupId>mysql</groupId>
       <artifactId>mysql-connector-java</artifactId>
       <version>5.0.4</version>
     </dependency>
     <dependency>
       <groupId>com.alibaba</groupId>
       <artifactId>druid</artifactId>
       <version>1.0.31</version>
     </dependency>
     <dependency>
       <groupId>org.mybatis.spring.boot</groupId>
       <artifactId>mybatis-spring-boot-starter</artifactId>
       <version>1.3.0</version>
     </dependency>
     <dependency>
       <groupId>ch.qos.logback</groupId>
       <artifactId>logback-core</artifactId>
       <version>1.2.3</version>
     </dependency>
     <dependency>
       <groupId>junit</groupId>
       <artifactId>junit</artifactId>
       <version>${junit.version}</version>
       <scope>test</scope>
     </dependency>
     <dependency>
       <groupId>log4j</groupId>
       <artifactId>log4j</artifactId>
       <version>${log4j.version}</version>
     </dependency>
   </dependencies>
  </dependencyManagement>
</project>

microservicecloud-api公共子模块Module

新建microservicecloud-api

创建完成后请回到父工程查看pom文件变化

修改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><!-- 子类里面显示声明才能有明确的继承表现，无意外就是父类的默认版本否则自己定义 -->
   <groupId>com.atguigu.springcloud</groupId>
   <artifactId>microservicecloud</artifactId>
   <version>0.0.1-SNAPSHOT</version>
  </parent>
 
  <artifactId>microservicecloud-api</artifactId><!-- 当前Module我自己叫什么名字 -->
 
  <dependencies><!-- 当前Module需要用到的jar包，按自己需求添加，如果父类已经包含了，可以不用写版本号 -->
   <dependency>
     <groupId>org.projectlombok</groupId>
     <artifactId>lombok</artifactId>
   </dependency>
  </dependencies> 
</project>

新建部门Entity且配合lombok使用

package com.atguigu.springcloud.entities;
 
import java.io.Serializable;
 
import lombok.Data;
import lombok.NoArgsConstructor;
import lombok.experimental.Accessors;
 
@SuppressWarnings("serial")
@NoArgsConstructor
@Data
@Accessors(chain=true)
public class Dept implements Serializable //必须序列化
{
  private Long  deptno;   //主键
  private String  dname;   //部门名称
  private String  db_source;//来自那个数据库，因为微服务架构可以一个服务对应一个数据库，同一个信息被存储到不同数据库
  
  public Dept(String dname)
  {
   super();
   this.dname = dname;
  }
}

mvn clean install后给其它模块引用，达到通用目的。
也即需要用到部门实体的话，不用每个工程都定义一份，直接引用本模块即可。

microservicecloud-provider-dept-8001  部门微服务提供者Module

1 新建microservicecloud-provider-dept-8001

创建完成后请回到父工程查看pom文件变化

2 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.atguigu.springcloud</groupId>
   <artifactId>microservicecloud</artifactId>
   <version>0.0.1-SNAPSHOT</version>
  </parent>
 
  <artifactId>microservicecloud-provider-dept-8001</artifactId>
 
  <dependencies>
   <dependency><!-- 引入自己定义的api通用包，可以使用Dept部门Entity -->
     <groupId>com.atguigu.springcloud</groupId>
     <artifactId>microservicecloud-api</artifactId>
     <version>${project.version}</version>
   </dependency>
   <dependency>
     <groupId>junit</groupId>
     <artifactId>junit</artifactId>
   </dependency>
   <dependency>
     <groupId>mysql</groupId>
     <artifactId>mysql-connector-java</artifactId>
   </dependency>
   <dependency>
     <groupId>com.alibaba</groupId>
     <artifactId>druid</artifactId>
   </dependency>
   <dependency>
     <groupId>ch.qos.logback</groupId>
     <artifactId>logback-core</artifactId>
   </dependency>
   <dependency>
     <groupId>org.mybatis.spring.boot</groupId>
     <artifactId>mybatis-spring-boot-starter</artifactId>
   </dependency>
   <dependency>
     <groupId>org.springframework.boot</groupId>
     <artifactId>spring-boot-starter-jetty</artifactId>
   </dependency>
   <dependency>
     <groupId>org.springframework.boot</groupId>
     <artifactId>spring-boot-starter-web</artifactId>
   </dependency>
   <dependency>
     <groupId>org.springframework.boot</groupId>
     <artifactId>spring-boot-starter-test</artifactId>
   </dependency>
   <!-- 修改后立即生效，热部署 -->
   <dependency>
     <groupId>org.springframework</groupId>
     <artifactId>springloaded</artifactId>
   </dependency>
   <dependency>
     <groupId>org.springframework.boot</groupId>
     <artifactId>spring-boot-devtools</artifactId>
   </dependency>
  </dependencies>
 
</project>

server:
  port: 8001
  
mybatis:
  config-location: classpath:mybatis/mybatis.cfg.xml        # mybatis配置文件所在路径
  type-aliases-package: com.atguigu.springcloud.entities    # 所有Entity别名类所在包
  mapper-locations:
  - classpath:mybatis/mapper/**/*.xml                       # mapper映射文件
    
spring:
   application:
    name: microservicecloud-dept 
   datasource:
    type: com.alibaba.druid.pool.DruidDataSource            # 当前数据源操作类型
    driver-class-name: org.gjt.mm.mysql.Driver              # mysql驱动包
    url: jdbc:mysql://localhost:3306/cloudDB01              # 数据库名称
    username: root
    password: 123456
    dbcp2:
      min-idle: 5                                           # 数据库连接池的最小维持连接数
      initial-size: 5                                       # 初始化连接数
      max-total: 5                                          # 最大连接数
      max-wait-millis: 200                                  # 等待连接获取的最大超时时间

4 工程src/main/resources目录下新建mybatis文件夹后新建mybatis.cfg.xml文件

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE configuration
  PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
  "http://mybatis.org/dtd/mybatis-3-config.dtd">
  
<configuration>
 
  <settings>
   <setting name="cacheEnabled" value="true"/><!-- 二级缓存开启 -->
  </settings>
 
</configuration>

5 MySQL创建部门数据库脚本

DROP DATABASE IF EXISTS cloudDB01;
CREATE DATABASE cloudDB01 CHARACTER SET UTF8;
USE cloudDB01;
CREATE TABLE dept
(
  deptno BIGINT NOT NULL PRIMARY KEY AUTO_INCREMENT,
  dname VARCHAR(60),
  db_source   VARCHAR(60)
);
 
INSERT INTO dept(dname,db_source) VALUES('开发部',DATABASE());
INSERT INTO dept(dname,db_source) VALUES('人事部',DATABASE());
INSERT INTO dept(dname,db_source) VALUES('财务部',DATABASE());
INSERT INTO dept(dname,db_source) VALUES('市场部',DATABASE());
INSERT INTO dept(dname,db_source) VALUES('运维部',DATABASE());
 
SELECT * FROM dept;

6 DeptDao部门接口

package com.atguigu.springcloud.dao;
 
import java.util.List;
import org.apache.ibatis.annotations.Mapper;
import com.atguigu.springcloud.entities.Dept;
 
@Mapper
public interface DeptDao
{
  public boolean addDept(Dept dept);
 
  public Dept findById(Long id);
 
  public List<Dept> findAll();
}

7 工程src/main/resources/mybatis目录下新建mapper文件夹后再建DeptMapper.xml

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
"http://mybatis.org/dtd/mybatis-3-mapper.dtd">
 
<mapper namespace="com.atguigu.springcloud.dao.DeptDao">
 
  <select id="findById" resultType="Dept" parameterType="Long">
   select deptno,dname,db_source from dept where deptno=#{deptno}; 
  </select>
  <select id="findAll" resultType="Dept">
   select deptno,dname,db_source from dept; 
  </select>
  <insert id="addDept" parameterType="Dept">
   INSERT INTO dept(dname,db_source) VALUES(#{dname},DATABASE());
  </insert>
  
</mapper>

8 DeptService部门服务接口

package com.atguigu.springcloud.service;
 
import java.util.List;
 
import com.atguigu.springcloud.entities.Dept;
 
public interface DeptService
{
  public boolean add(Dept dept);
  public Dept    get(Long id);
  public List<Dept> list();
}

9 DeptServiceImpl部门服务接口实现类

package com.atguigu.springcloud.service.impl;
 
import java.util.List;
 
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
 
import com.atguigu.springcloud.dao.DeptDao;
import com.atguigu.springcloud.entities.Dept;
import com.atguigu.springcloud.service.DeptService;
 
@Service
public class DeptServiceImpl implements DeptService
{
  @Autowired
  private DeptDao dao ;
  
  @Override
  public boolean add(Dept dept)
  {
   return dao.addDept(dept);
  }
 
  @Override
  public Dept get(Long id)
  {
   return dao.findById(id);
  }
 
  @Override
  public List<Dept> list()
  {
   return dao.findAll();
  }
 
}

10 DeptController部门微服务提供者REST

package com.atguigu.springcloud.controller;
 
import java.util.List;
 
import org.springframework.beans.factory.annotation.Autowired;
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;
import org.springframework.web.bind.annotation.RestController;
 
import com.atguigu.springcloud.entities.Dept;
import com.atguigu.springcloud.service.DeptService;
 
@RestController
public class DeptController
{
  @Autowired
  private DeptService service;
  
  @RequestMapping(value="/dept/add",method=RequestMethod.POST)
  public boolean add(@RequestBody Dept dept)
  {
   return service.add(dept);
  }
  
  @RequestMapping(value="/dept/get/{id}",method=RequestMethod.GET)
  public Dept get(@PathVariable("id") Long id)
  {
   return service.get(id);
  }
  
  @RequestMapping(value="/dept/list",method=RequestMethod.GET)
  public List<Dept> list()
  {
   return service.list();
  }
}

11 DeptProvider8001_App主启动类DeptProvider8001_App

package com.atguigu.springcloud;
 
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
 
@SpringBootApplication
public class DeptProvider8001_App
{
  public static void main(String[] args)
  {
   SpringApplication.run(DeptProvider8001_App.class, args);
  }
}

12 测试

http://localhost:8001/dept/get/2

http://localhost:8001/dept/list

13 最终工程展现

microservicecloud-consumer-dept-80部门微服务消费者Module

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.atguigu.springcloud</groupId>
   <artifactId>microservicecloud</artifactId>
   <version>0.0.1-SNAPSHOT</version>
  </parent>
 
  <artifactId>microservicecloud-consumer-dept-80</artifactId>
  <description>部门微服务消费者</description>
 
  <dependencies>
   <dependency><!-- 自己定义的api -->
     <groupId>com.atguigu.springcloud</groupId>
     <artifactId>microservicecloud-api</artifactId>
     <version>${project.version}</version>
   </dependency> 
   <dependency>
     <groupId>org.springframework.boot</groupId>
     <artifactId>spring-boot-starter-web</artifactId>
   </dependency>
   <!-- 修改后立即生效，热部署 -->
   <dependency>
     <groupId>org.springframework</groupId>
     <artifactId>springloaded</artifactId>
   </dependency>
   <dependency>
     <groupId>org.springframework.boot</groupId>
     <artifactId>spring-boot-devtools</artifactId>
   </dependency>   
  </dependencies>
</project>

YML

server:
  port: 80

com.atguigu.springcloud.cfgbeans包下ConfigBean的编写（类似spring里面的applicationContext.xml写入的注入Bean）

package com.atguigu.springcloud.cfgbeans;
 
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.client.RestTemplate;
 
@Configuration
public class ConfigBean
{
    @Bean
    public RestTemplate getRestTemplate()
    {
         return new RestTemplate();
    }
}

com.atguigu.springcloud.controller包下新建DeptController_Consumer部门微服务消费者REST

RestTemplate

是什么

RestTemplate提供了多种便捷访问远程Http服务的方法， 是一种简单便捷的访问restful服务模板类，是Spring提供的用于访问Rest服务的客户端模板工具集

官网及使用

官网地址
https://docs.spring.io/spring-framework/docs/4.3.7.RELEASE/javadoc-api/org/springframework/web/client/RestTemplate.html
使用
使用restTemplate访问restful接口非常的简单粗暴无脑。
(url, requestMap, ResponseBean.class)这三个参数分别代表 REST请求地址、请求参数、HTTP响应转换被转换成的对象类型。

代码

package com.atguigu.springcloud.controller;
 
import java.util.List;
 
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.client.RestTemplate;
 
import com.atguigu.springcloud.entities.Dept;
 
@RestController
public class DeptController_Consumer
{
    private static final String REST_URL_PREFIX = "http://localhost:8001";
    
    @Autowired
    private RestTemplate restTemplate;
    
    @RequestMapping(value="/consumer/dept/add")
    public boolean add(Dept dept)
    {
         return restTemplate.postForObject(REST_URL_PREFIX+"/dept/add", dept, Boolean.class);
    }
    
    @RequestMapping(value="/consumer/dept/get/{id}")
    public Dept get(@PathVariable("id") Long id)
    {
         return restTemplate.getForObject(REST_URL_PREFIX+"/dept/get/"+id, Dept.class);
    }
    
    @SuppressWarnings("unchecked")
    @RequestMapping(value="/consumer/dept/list")
    public List<Dept> list()
    {
         return restTemplate.getForObject(REST_URL_PREFIX+"/dept/list", List.class);
    }   
}

DeptConsumer80_App主启动类

package com.atguigu.springcloud;
 
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
 
 
@SpringBootApplication
public class DeptConsumer80_App
{
  public static void main(String[] args)
  {
   SpringApplication.run(DeptConsumer80_App.class, args);
  }
}

测试

http://localhost/consumer/dept/get/2

http://localhost/consumer/dept/list

http://localhost/consumer/dept/add?dname=AI

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