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SpringCloud和SpringBoot的关系

SpringBoot专注于快速、方便地开发单个个体微服务，SpringCloud关注全局的治理框架，它将SpringBoot开发的一个个单体微服务整合并管理起来，为各个微服务之间提供：管理配置、服务发现、断路器、路由、微代理、事件总线、全局锁、决策竞选、分布式会话等等集成服务

SpringCloud

SpringCloud和Dubbo的最大区别：SpringCloud抛弃了Dubbo的RPC通信，采用的是基于HTTP的REST方式

自学网站

Spring Cloud Netfix：Spring Cloud Netflix【spring cloud中文版】--spring cloud中文文档

中文API文档：Spring Cloud Dalston 中文文档 参考手册 中文版

SpringCloud中国社区：Spring Cloud中国社区

SpringCloud中文网：Spring Cloud中文网-官方文档中文版

SpringCloud版本选择

版本说明

 实际开发版本关系

创建父工程

创建一个maven工程，去掉src目录

配置pom.xml

<?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">
    <modelVersion>4.0.0</modelVersion>

    <groupId>org.example</groupId>
    <artifactId>SpringCloud</artifactId>
    <version>1.0-SNAPSHOT</version>

    <!--打包方式 pom-->
    <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>
            <!--springCloud的依赖-->
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-dependencies</artifactId>
                <version>Greenwich.SR1</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
            <!--SpringBoot-->
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-dependencies</artifactId>
                <version>2.1.4.RELEASE</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
            <!--数据库-->
            <dependency>
                <groupId>mysql</groupId>
                <artifactId>mysql-connector-java</artifactId>
                <version>5.1.47</version>
            </dependency>
            <dependency>
                <groupId>com.alibaba</groupId>
                <artifactId>druid</artifactId>
                <version>1.1.10</version>
            </dependency>
            <!--SpringBoot 启动器-->
            <dependency>
                <groupId>org.mybatis.spring.boot</groupId>
                <artifactId>mybatis-spring-boot-starter</artifactId>
                <version>1.3.2</version>
            </dependency>
            <!--日志测试~-->
            <dependency>
                <groupId>ch.qos.logback</groupId>
                <artifactId>logback-core</artifactId>
                <version>1.2.3</version>
            </dependency>
            <dependency>
                <groupId>junit</groupId>
                <artifactId>junit</artifactId>
                <version>${junit.version}</version>
            </dependency>
            <dependency>
                <groupId>log4j</groupId>
                <artifactId>log4j</artifactId>
                <version>${log4j.version}</version>
            </dependency>
            <dependency>
                <groupId>org.projectlombok</groupId>
                <artifactId>lombok</artifactId>
                <version>${lombok.version}</version>
            </dependency>
        </dependencies>
    </dependencyManagement>
</project>

服务提供者

一、创建子module1（springcloud-api）

1、创建数据库

create database db01
use db01

create table dept(
	deptno int primary key not null auto_increment,
	dname varchar(20),
	db_source varchar(20)
)

insert into dept(dname,db_source) values('开发部',DATABASE());
insert into dept(dname,db_source) values('销售部',DATABASE());
insert into dept(dname,db_source) values('运维部',DATABASE());
insert into dept(dname,db_source) values('测试部',DATABASE());
insert into dept(dname,db_source) values('财务部',DATABASE());

2、创建实体类

@Data
@NoArgsConstructor
@Accessors(chain = true) //链式写法
public class Dept implements Serializable {
    private Integer deptno;
    private String dname;
    //表示这个数据是存在哪个数据库的字段
    //微服务：一个服务对应一个数据库，同一个信息可能存在不同的数据库
    private String dbSource;

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

二、创建子模块2（springcloud-provider-dept-8081）

1、pom.xml

<?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</artifactId>
        <groupId>org.example</groupId>
        <version>1.0-SNAPSHOT</version>
    </parent>
    <modelVersion>4.0.0</modelVersion>

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

    <dependencies>
        <!--我们需要拿到实体类，所以要配置api module-->
        <dependency>
            <groupId>org.example</groupId>
            <artifactId>springcloud-api</artifactId>
            <version>1.0-SNAPSHOT</version>
        </dependency>
        <!--导入父工程的依赖-->
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <scope>test</scope>
        </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>
        <!--test-->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-test</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <!--jetty-->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-jetty</artifactId>
        </dependency>
        <!--热部署工具-->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-devtools</artifactId>
        </dependency>
        <dependency>
            <groupId>org.example</groupId>
            <artifactId>springcloud-api</artifactId>
            <version>1.0-SNAPSHOT</version>
            <scope>compile</scope>
        </dependency>
    </dependencies>
</project>

2、Dao

①DeptDao

@Mapper
@Repository
public interface DeptDao {
    public Integer addDept(Dept dept);
    public Dept queryById(Integer deptno);
    public List<Dept> queryAll();
}

②DeptMapper.xml

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper
        PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
        "https://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.springcloud.dao.DeptDao">
    <resultMap id="DeptMap" type="Dept">
        <id property="deptno" column="deptno"></id>
        <result property="dname" column="dname"></result>
        <result property="dbSource" column="db_source"></result>
    </resultMap>

   <insert id="addDept" parameterType="Dept">
       insert into dept(dname, db_source) values(#{dname}, DATABASE())
   </insert>

    <select id="queryById" parameterType="Integer"  resultMap="DeptMap">
        select * from dept where deptno = #{deptno}
    </select>

    <select id="queryAll"  resultMap="DeptMap">
        select * from dept
    </select>
</mapper>

3、application.xml

server:
  port: 8001

#mybatis配置
mybatis:
  type-aliases-package: com.springcloud.pojo
  mapper-locations: classpath:mybatis/mapper/*.xml

#spring配置
spring:
  application:
    name: springcloud-provider-dept
  datasource:
    type: com.alibaba.druid.pool.DruidDataSource
    drive-class-name: org.gjt.mm.mysql.Driver
    url: jdbc:mysql://localhost:3306/db01?useSSL=false&useUnicode=true&characterEncoding=UTF-8&serverTimezone=GMT%2B8
    username: root
    password: 123456

4、service

①DeptService

public interface DeptService {
    public Integer addDept(Dept dept);
    public Dept queryById(Integer deptno);
    public List<Dept> queryAll();
}

②DeptServiceImpl

@Service
public class DeptServiceImpl implements DeptService {
    @Autowired
    private DeptDao deptDao;

    @Override
    public Integer addDept(Dept dept) {
        return deptDao.addDept(dept);
    }

    @Override
    public Dept queryById(Integer deptno) {
        return deptDao.queryById(deptno);
    }

    @Override
    public List<Dept> queryAll() {
        return deptDao.queryAll();
    }
}

5、controller

@RestController
public class DeptController {
    @Autowired
    private DeptService deptService;

    @PostMapping("/dept/add")
    public Integer addDept(Dept dept){
        return deptService.addDept(dept);
    }

    @GetMapping("/dept/get/{deptno}")
    public Dept queryById(@PathVariable("deptno") Integer deptno){
        return deptService.queryById(deptno);
    }

    @GetMapping("/dept/list")
    public List<Dept> queryAll(){
        return deptService.queryAll();
    }
}

6、主启动类

//启动类
@SpringBootApplication
public class DeptProvider_8001 {
    public static void main(String[] args){
        SpringApplication.run(DeptProvider_8001.class,args);
    }
}

服务消费者

三、创建子模块3（springcloud-consumer-dept-80）

1、pom.xml

<?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</artifactId>
        <groupId>org.example</groupId>
        <version>1.0-SNAPSHOT</version>
    </parent>
    <modelVersion>4.0.0</modelVersion>

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

    <!--实体类+web-->
    <dependencies>
        <dependency>
            <groupId>org.example</groupId>
            <artifactId>springcloud-api</artifactId>
            <version>1.0-SNAPSHOT</version>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-devtools</artifactId>
        </dependency>
    </dependencies>

</project>

2、 application.xml

server:
  port: 8080

3、ConfigBean（用来注册RestTemplate的Bean）

@Configuration
public class ConfigBean {
    @Bean
    public RestTemplate getRestTemplate(){
        return new RestTemplate();
    }
}

4、controller

@RestController
public class DeptConsumerController {
    //理解：消费者，不应该有service
    @Autowired
    private RestTemplate restTemplate;  //提供多种便捷访问远程http服务的方法，简单的Restful服务模板

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

    @RequestMapping("/consumer/dept/add")
    public Integer addDept(Dept dept){
        return restTemplate.postForObject(REST_URL_PREFIX+"/dept/add", dept,Integer.class);
    }

    @RequestMapping("/consumer/dept/get/{deptno}")
    public Dept queryById(@PathVariable("deptno") Integer deptno){
        return restTemplate.getForObject(REST_URL_PREFIX + "/dept/get/" + deptno, Dept.class);
    }

    @RequestMapping("/consumer/dept/list")
    public List<Dept> list(){
        return restTemplate.getForObject(REST_URL_PREFIX + "/dept/list", List.class);
    }
}