Springboot搭建微服务案例之Eureka注册中心

一、父工程依赖管理

<?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.mumu</groupId>
    <artifactId>eureka</artifactId>
    <packaging>pom</packaging>
    <version>1.0</version>
    <modules>
        <module>common</module>
        <module>consumer</module>
        <module>springcloud-service-provider</module>
    </modules>

    <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>
        <mysql.version>5.1.47</mysql.version>
        <lombok.version>1.16.18</lombok.version>
        <druid.version>1.1.16</druid.version>
        <mybatis.spring.boot.version>1.3.0</mybatis.spring.boot.version>
    </properties>
    <dependencyManagement>
        <dependencies>
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
                <version>2.2.1.RELEASE</version>
            </dependency>
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-starter-netflix-eureka-server</artifactId>
                <version>2.2.1.RELEASE</version>
            </dependency>
            <dependency>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-project-info-reports-plugin</artifactId>
                <version>3.0.0</version>
            </dependency>
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-dependencies</artifactId>
                <version>2.2.2.RELEASE</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
            <dependency>
                <groupId>mysql</groupId>
                <artifactId>mysql-connector-java</artifactId>
                <version>${mysql.version}</version>
                <scope>runtime</scope>
            </dependency>
            <!--        <!- druid->-->
            <dependency>
                <groupId>com.alibaba</groupId>
                <artifactId>druid-spring-boot-starter</artifactId>
                <version>1.1.10</version>
            </dependency>
            <dependency>
                <groupId>org.mybatis.spring.boot</groupId>
                <artifactId>mybatis-spring-boot-starter</artifactId>
                <version>${mybatis.spring.boot.version}</version>
            </dependency>
            <dependency>
                <groupId>junit</groupId>
                <artifactId>junit</artifactId>
                <version>${junit.version}</version>
            </dependency>
        </dependencies>
    </dependencyManagement>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
                <configuration>
                    <addResources>true</addResources>
                </configuration>
            </plugin>
        </plugins>
    </build>

</project>

二、搭建公共模块common

放一些pojo类

1. 依赖引入

<?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>eureka</artifactId>
        <groupId>org.mumu</groupId>
        <version>1.0</version>
    </parent>
    <modelVersion>4.0.0</modelVersion>
    <artifactId>springcloud-service-common</artifactId>
    <version>1.0</version>
    <properties>
        <maven.compiler.source>8</maven.compiler.source>
        <maven.compiler.target>8</maven.compiler.target>
    </properties>
    <dependencies>
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <version>1.18.30</version>
        </dependency>
    </dependencies>

</project>

2.实体类


@Data // 省略写get set方法
@NoArgsConstructor //提供无参数的构造函数
@AllArgsConstructor //提供带所有参数的构造函数
public class Payment implements Serializable {

    private long id;
    private String serial;
}

三、搭建服务提供方provider

1.依赖引入

<?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>eureka</artifactId>
        <groupId>org.mumu</groupId>
        <version>1.0</version>
    </parent>
    <modelVersion>4.0.0</modelVersion>

    <artifactId>springcloud-service-provider</artifactId>
    <version>1.0</version>
    <groupId>org.mumu</groupId>

    <properties>
        <maven.compiler.source>8</maven.compiler.source>
        <maven.compiler.target>8</maven.compiler.target>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.mumu</groupId>
            <artifactId>springcloud-service-common</artifactId>
            <version>1.0</version>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-actuator</artifactId>
        </dependency>
        <dependency>
            <groupId>org.mybatis.spring.boot</groupId>
            <artifactId>mybatis-spring-boot-starter</artifactId>
        </dependency>
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>druid-spring-boot-starter</artifactId>
        </dependency>
        <!--mysql-connector-java-->
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
        </dependency>
        <!--jdbc-->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-jdbc</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-devtools</artifactId>
            <scope>runtime</scope>
            <optional>true</optional>
        </dependency>
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <optional>true</optional>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
        <!--eureka-client-->
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
        </dependency>
    </dependencies>

</project>

2.配置类

server:
  port: 8001 #配置服务端口号
spring:
  application:
    name: service-provider # 配置服务提供方的名称
  datasource:  # 配置连接数据库的基本信息
    driver-class-name: com.mysql.jdbc.Driver   # 驱动
    url: jdbc:mysql://localhost:3306/cloud2023  # 连接数据库的url
    username: root   # 连接数据库的用户名
    password: 123456   # 连接数据库的密码
mybatis:
  config-location: classpath:/mybatis/sqlMapConfig.xml   # 引入mybatis的核心配置文件
  mapper-locations: classpath:/mybatis/mapper/*.xml  # 引入mybatis的映射文件
eureka:
  client:
    register-with-eureka: true # 允许将当前服务注册到eureka注册中心
    fetch-registry: true # 允许当前微服务拉取注册中心中的服务信息
    service-url:
      defaultZone: http://localhost:7001/eureka/,http://localhost:7002/eureka/  # eureka注册中心的地址

3.编写启动类

@SpringBootApplication
@MapperScan(basePackages = "com.xq.dao")
@EnableDiscoveryClient //开启服务发现的功能
public class ProviderApplication {
    public static void main(String[] args) {
        SpringApplication.run(ProviderApplication.class,args);
    }
}

4. 编写业务逻辑

（1）整合mybatis

dao层

public interface PaymentDao {

    //根据id查询payment信息
    public Payment findById(long id);

    //新增payment信息
    public void add(Payment payment);
}

创建dao接口的映射文件还有mybatis的核心配置文件

<?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="org.mumu.dao.PaymentDao">

    <!--根据id查询payment信息-->
    <select id="findById" parameterType="long" resultType="payment">
        SELECT * FROM `payment` WHERE id = #{id}
    </select>

    <!--新增payment信息-->
    <insert id="add" parameterType="payment">
        INSERT INTO `payment`(`id`,`serial`) VALUES(#{id},#{serial})
    </insert>
</mapper>

配置 MyBatis 的类型别名，简化 MyBatis 映射文件中的配置

<?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>
    <!--取别名-->
    <typeAliases>
        <package name="org.mumu.pojo"></package>
    </typeAliases>
</configuration>

（2）Service

@Service
public class PaymentServiceImpl implements PaymentService {

    @Resource
    PaymentDao paymentDao;

    @Override
    public Payment findById(long id) {
        return paymentDao.findById(id);
    }

    @Override
    public void add(Payment payment) {
        paymentDao.add(payment);
    }

    @Override
    public void save(Payment payment) {
        paymentDao.add(payment);
    }
}

5.定义控制器

@RestController
@RequestMapping("provider")
public class PaymentController {
    @Resource
    PaymentService paymentService;
    @Value("${server.port}")
    String port;

    @RequestMapping("findById")
    public Result<Payment> findById(@RequestParam("id") long id){
        try {
            Thread.sleep(3000);
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
        Payment payment = paymentService.findById(id);
        return new Result<>(200,"数据查询成功,当前服务端口号是:" + this.port,payment);
    }
}

四、搭建服务消费方consumer

1.依赖引入

<dependencies>
        <dependency>
            <groupId>org.mumu</groupId>
            <artifactId>springcloud-service-common</artifactId>
            <version>1.0</version>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-actuator</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-devtools</artifactId>
            <scope>runtime</scope>
            <optional>true</optional>
        </dependency>
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <optional>true</optional>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
        <!--eureka-client-->
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
        </dependency>
    </dependencies>

2.配置类

server:
  port: 80
spring:
  application:
    name: service-consumer
eureka:
  client:
    register-with-eureka: true # 允许将当前服务注册到eureka注册中心
    fetch-registry: true # 允许当前微服务拉取注册中心中的服务信息
    service-url:
      defaultZone: http://localhost:7001/eureka/,http://localhost:7002/eureka/  # eureka注册中心的地址

3.启动类

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

4.注入RestTemplate组件到ioc容器

使用 RestTemplate 这个 Java 客户端组件来实现服务的远程调用。所以我们需要将

RestTemplate 使用 Java 配置类进行注入：

@Configuration
public class MyConfig {

    @Bean
    public RestTemplate restTemplate(){
        return new RestTemplate();
    }

}

5.定义控制器

@RestController
@RequestMapping("consumer")
@Slf4j
public class PaymentController {

   @Resource
   RestTemplate restTemplate;


    @RequestMapping("findById/{id}")
    public Result<Payment> findById(@PathVariable("id") long id){
        String url = "http://localhost:8001/provider/findById?id=" + id; //维护服务提供方的ip+端口
        Result result = restTemplate.getForObject(url, Result.class);
        return result;
    }
}

五、搭建服务注册中心

1.引入依赖server

    <dependencies>
        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>javax.servlet-api</artifactId>
            <version>4.0.1</version> <!-- 使用与Tomcat 9.0.29 兼容的版本 -->
        </dependency>
        <!--eureka服务端依赖-->
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-netflix-eureka-server</artifactId>
        </dependency>

        <!--web启动器-->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-actuator</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-devtools</artifactId>
            <scope>runtime</scope>
            <optional>true</optional>
        </dependency>
    </dependencies>

2.配置类

这里不需要要进行服务注册，因为这个模块的server模块

负责对其他Client进行服务注册

server:
  port: 7001
# 配置eureka服务端
eureka:
  client:
    register-with-eureka: false  # 禁止自己注册自己
    fetch-registry: false  # 禁止抓取注册中心中的服务信息
    service-url:
      defaultZone: http://localhost:7001/eureka/  # eureka服务端的地址

3.启动类

@SpringBootApplication
@EnableEurekaServer // 标识当前服务是Eurkea服务端
public class EurekaServerApplication {
    public static void main(String[] args) {
        SpringApplication.run(EurekaServerApplication.class,args);
    }
}