【二】Spring Cloud 入门

 官网

版本号：

SpringCloud中文网：https://springcloud.cc

SpringCloud中文社区：http://springcloud.cn

以下代码就是Maven父子工程，子工程是SpringBoot实现 的一个小例子

1、总体介绍

1）、案例：

​ 以一个Dept部门的模块做一个微服务的通用案例Consumer消费者（Client）通过REST调用提供者（Server）提供服务。

2）、maven的分包分模块架构复习

 

 根据案例拆分成下面几个模块：

 

2、本次SpringCloud版本

SpringCloud版本：Dalston.SR1

SpringBoot版本：1.5.x

3、构建步骤

搭建父工程时候一定要注意packaging 是pom ，最后新建完所有工程后父工程会自动加入子模块。

 

四个工程步骤如下：

3.1、microservicecloud 父工程

新建一个Project 的 maven工程

 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.everjiankang.springcloud</groupId>
    <artifactId>microservicecloud</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <!--这里一定选的是pom  不要是jar war-->
    <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>

 

3.2、microservicecloud-api

对着父工程（microservicecloud）新建一个module

 

 

POM 

<?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>microservicecloud</artifactId>
        <groupId>com.everjiankang.springcloud</groupId>
        <version>0.0.1-SNAPSHOT</version>
    </parent>
    <modelVersion>4.0.0</modelVersion>

    <artifactId>microservicecloud-api</artifactId>

    <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>

新建一个Dept的实体类

import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;
import lombok.experimental.Accessors;
import java.io.Serializable;
@AllArgsConstructor　　　　　　//有参构造函数，所有属性
@NoArgsConstructor　　　　　　 //默认无参数构造函数
@Data　　　　　　　　　　　　　　 //get set toString,equals,hashCode,canEquals
@Accessors(chain = true)　　  //链式编程
public class Dept implements Serializable{  //必须序列化

    // 主键
    private Long     deptno;

    // 部门名称
    private String     dname;

    // 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
    private String     db_source;

    public Dept(String dname)
    {
        super();
        this.dname = dname;
    }
}

3.3、microservicecloud-provider-dept-8001

建maven步骤可以参考microservicecloud-api建maven的步骤也是依赖父工程。

此工程目前实现Dept的增删查改操作（springboot+mybatis）

POM

<?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>microservicecloud</artifactId>
        <groupId>com.everjiankang.springcloud</groupId>
        <version>0.0.1-SNAPSHOT</version>
    </parent>
    <modelVersion>4.0.0</modelVersion>

    <artifactId>microservicecloud-provider-dept-8001</artifactId>

    <dependencies>
        <!-- 引入自己定义的api通用包，可以使用Dept部门Entity -->
        <dependency>
            <groupId>com.everjiankang.springcloud</groupId>
            <artifactId>microservicecloud-api</artifactId>
            <version>${project.version}</version>
        </dependency>
        <!-- actuator监控信息完善 -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-actuator</artifactId>
        </dependency>
        <!-- 将微服务provider侧注册进eureka -->
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-eureka</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-config</artifactId>
        </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>

YML

server:
  port: 8001

mybatis:
  config-location: classpath:mybatis/mybatis.cfg.xml        # mybatis配置文件所在路径
  type-aliases-package: com.everjiankang.springcloud.entity         # 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                            # 微服务整合的命名 ，对外暴露的名字，非常重要
   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/springclouddb01            # 数据库名称
    username: root
    password: 1010
    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

建表sql语句

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;

mybatis.cfg.xml (可有可无)

<?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>

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.everjiankang.springcloud.dao.DeptDao">

    <select id="findById" resultType="com.everjiankang.springcloud.entity.Dept" parameterType="long">
        select deptno,dname,db_source from dept where deptno=#{deptno};
    </select>
    <select id="findAll" resultType="com.everjiankang.springcloud.entity.Dept">
        select deptno,dname,db_source from dept;
    </select>
    <insert id="addDept" parameterType="com.everjiankang.springcloud.entity.Dept">
        INSERT INTO dept(dname,db_source) VALUES(#{dname},DATABASE());
    </insert>

</mapper>

DeptDao.java

package com.everjiankang.springcloud.dao;
@Mapper
public interface DeptDao
{
    public boolean addDept(Dept dept);

    public Dept findById(Long id);

    public List<Dept> findAll();
}

DeptService.java

package com.everjiankang.springcloud.service;
public interface DeptService
{
   public boolean add(Dept dept);

   public Dept get(Long id);

   public List<Dept> list();
}

DeptServiceImpl.java

package com.everjiankang.springcloud.service.impl;

@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();
   }

}

DeptController.java

package com.everjiankang.springcloud.controller;
@RestController
public class DeptController
{
    @Autowired
    private DeptService service;

    @Autowired
    private DiscoveryClient client;

    @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();
    }

    
//    @Autowired
//    private DiscoveryClient client;
    @RequestMapping(value = "/dept/discovery", method = RequestMethod.GET)
    public Object discovery()
    {
        List<String> list = client.getServices();
        System.out.println("**********" + list);

        List<ServiceInstance> srvList = client.getInstances("MICROSERVICECLOUD-DEPT");
        for (ServiceInstance element : srvList) {
            System.out.println(element.getServiceId() + "	" + element.getHost() + "	" + element.getPort() + "	"
                    + element.getUri());
        }
        return this.client;
    }

}

3.4、microservicecloud-consumer-dept-80
建maven步骤可以参考microservicecloud-api建maven的步骤也是依赖父工程。

实现调用microservicecloud-provider-dept-8001的Controller层的接口

<?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>microservicecloud</artifactId>
        <groupId>com.everjiankang.springcloud</groupId>
        <version>0.0.1-SNAPSHOT</version>
    </parent>
    <modelVersion>4.0.0</modelVersion>

    <artifactId>microservicecloud-consumer-dept-80</artifactId>


    <dependencies>
        <dependency><!-- 自己定义的api -->
            <groupId>com.everjiankang.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

ConfigBean.java

package com.everjiankang.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();
    }
}

DeptController_Consumer.java

package com.everjiankang.springcloud.controller;

import java.util.List;

import com.everjiankang.springcloud.entity.Dept;
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;

@RestController
public class DeptController_Consumer
{

    private static final String REST_URL_PREFIX = "http://localhost:8001";

    /**
     * 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。
     */
    @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);
    }
}

启动类DeptConsumer80_App.java

package com.everjiankang.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);
    }
}

初步需要得工程构建完成，下篇进入Eureka服务注册与发现。

源码：https://github.com/hfbin/SpringCloud-Demo

参考：https://blog.csdn.net/qq_33524158/article/category/7731580