SpringCloud--微服务架构简单案例

构建父工程（microservicecloud）

引入依赖：

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

    <groupId>pers.zhang</groupId>
    <artifactId>microservicecloud</artifactId>
    <version>1.0-SNAPSHOT</version>
    <modules>
        <module>microservicecloud-api</module>
        <module>microservicecloud-provider-dept-8001</module>
        <module>microservicecloud-consumer-dept-80</module>
    </modules>
    <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.bersion>1.16.18</lombok.bersion>
    </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>5.1.6</version>
            </dependency>
            <dependency>
                <groupId>com.alibaba</groupId>
                <artifactId>druid</artifactId>
                <version>1.1.20</version>
            </dependency>
            <dependency>
                <groupId>org.mybatis.spring.boot</groupId>
                <artifactId>mybatis-spring-boot-starter</artifactId>
                <version>1.3.2</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>

创建公共子模块（microservicecloud-api）

引入依赖：

<?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>microservicecloud</artifactId>
        <groupId>pers.zhang</groupId>
        <version>1.0-SNAPSHOT</version>
    </parent>
    <modelVersion>4.0.0</modelVersion>
    <packaging>jar</packaging>

    <artifactId>microservicecloud-api</artifactId>

    <!-- 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 -->
    <dependencies>
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
        </dependency>
    </dependencies>


</project>

部门实体类：

@AllArgsConstructor
@NoArgsConstructor
@Data
@Accessors(chain = true)
public class Dept implements Serializable {

    private Long deptno;//主键
    private String dname;//部门名称
    private String db_source;//来自哪个数据库，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


}

创建provider子模块（microservicecloud-provider-dept-8001）

引入依赖：

<?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>microservicecloud</artifactId>
        <groupId>pers.zhang</groupId>
        <version>1.0-SNAPSHOT</version>
    </parent>
    <modelVersion>4.0.0</modelVersion>

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

    <dependencies>
        <dependency>
            <groupId>pers.zhang</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>
        <!-- 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>

application.yml配置：

server:
  port: 8001

mybatis:
  config-location: classpath:mybatis/mybatis.cfg.xml  # mybatis 配置文件所在路径
  type-aliases-package: pers.zhang.entities           # 别名扫描包
  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     # 连接池最小维持连接数
      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

dao:

@Mapper
public interface DeptDao {

    boolean addDept(Dept dept);

    Dept findById(Long id);

    List<Dept> findAll();
}

mapper:

<?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="pers.zhang.dao.DeptDao">

    <select id="findById" resultType="pers.zhang.entities.Dept">
        SELECT deptno, dname, db_source
        FROM dept
        WHERE deptno = #{deptno}
    </select>

    <select id="findAll" resultType="pers.zhang.entities.Dept">
        SELECT deptno, dname, db_source
        FROM dept
    </select>

    <insert id="addDept" parameterType="pers.zhang.entities.Dept">
        INSERT INTO dept(dname, db_source)
        VALUES (#{dname}, DATABASE())
    </insert>

</mapper>

service:

public interface DeptService {

    boolean add(Dept dept);

    Dept get(Long id);

    List<Dept> list();
}

@Service
public class DeptServiceImpl implements DeptService {

    @Autowired
    DeptDao deptDao;

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

    @Override
    public Dept get(Long id) {
        return deptDao.findById(id);
    }

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

controller:

@RestController
public class DeptController {

    @Autowired
    DeptService deptService;

    @RequestMapping(value = "/dept/add", method = RequestMethod.POST)
    public boolean add(Dept dept){
        return deptService.add(dept);
    }

    @RequestMapping(value = "/dept/get/{id}", method = RequestMethod.GET)
    public Dept get(@PathVariable("id") Long id){
        return deptService.get(id);
    }

    @RequestMapping(value = "/dept/list", method = RequestMethod.GET)
    public List<Dept> list(){
        return deptService.list();
    }

}

启动类：

@SpringBootApplication
public class DeptProvider8001_App {
    public static void main(String[] args) {
        SpringApplication.run(DeptProvider8001_App.class, args);
    }
}

创建consumer子模块（microservicecloud-consumer-dept-80）

引入依赖：

<?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>microservicecloud</artifactId>
        <groupId>pers.zhang</groupId>
        <version>1.0-SNAPSHOT</version>
    </parent>
    <modelVersion>4.0.0</modelVersion>

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

    <dependencies>
        <dependency>
            <groupId>pers.zhang</groupId>
            <artifactId>microservicecloud-api</artifactId>
            <version>${project.version}</version>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <!-- 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>

配置：

server:
  port: 80

配置RestTemplate：

@Configuration
public class ConfigBean {

    /*
        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

        url：REST请求地址
        requestMap：请求参数
        ResponseBean.class：HTTP响应转换被转换成的对象类型
     */
    @Bean
    public RestTemplate getRestTemplate(){
        return new RestTemplate();
    }

}

controller:

@RestController
public class DeptController_Consumer {

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

    @Autowired
    RestTemplate restTemplate;

    @RequestMapping(value = "/consumer/dept/add")
    public boolean add(Dept dept){
        return restTemplate.postForObject(REST_RUL_PREFIX + "/dept/add", dept, Boolean.class);
    }

    @RequestMapping(value = "/consumer/dept/get/{id}")
    public Dept get(@PathVariable("id") Long id){
        return restTemplate.getForObject(REST_RUL_PREFIX + "/dept/get/" + id, Dept.class);
    }

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

启动类:

@SpringBootApplication
public class DeptCondumer80_App {

    public static void main(String[] args) {
        SpringApplication.run(DeptCondumer80_App.class, args);
    }
}

测试