SpringCloud 学习笔记 01 --eureka

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Spring CloudEureka微服务服务注册

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2018-03-24

⚠ 请注意，本文编写于 3029 天前，最后修改于 3029 天前，其中某些信息可能已经过时。

1. 新建maven父工程

父工程pom依赖

 <!-- 统一管理jar包版本 -->
    <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>
        <mysql.version>5.1.47</mysql.version>
        <druid.version>1.1.16</druid.version>
        <mybatis.spring.boot.version>1.3.0</mybatis.spring.boot.version>
    </properties>

    <!-- 子模块继承之后，提供作用：锁定版本+子modlue不用写groupId和version  -->
    <dependencyManagement>
        <dependencies>
            <!--spring boot 2.2.2-->
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-dependencies</artifactId>
                <version>2.2.2.RELEASE</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
            <!--spring cloud Hoxton.SR1-->
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-dependencies</artifactId>
                <version>Hoxton.SR1</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
            <!--spring cloud alibaba 2.1.0.RELEASE-->
            <dependency>
                <groupId>com.alibaba.cloud</groupId>
                <artifactId>spring-cloud-alibaba-dependencies</artifactId>
                <version>2.1.0.RELEASE</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
            <dependency>
                <groupId>mysql</groupId>
                <artifactId>mysql-connector-java</artifactId>
                <version>${mysql.version}</version>
            </dependency>
            <dependency>
                <groupId>com.alibaba</groupId>
                <artifactId>druid</artifactId>
                <version>${druid.version}</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>
            <dependency>
                <groupId>log4j</groupId>
                <artifactId>log4j</artifactId>
                <version>${log4j.version}</version>
            </dependency>
            <dependency>
                <groupId>org.projectlombok</groupId>
                <artifactId>lombok</artifactId>
                <version>${lombok.version}</version>
                <optional>true</optional>
            </dependency>
        </dependencies>
    </dependencyManagement>

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

2. eureka服务端子模块

a. pom 依赖

<dependencies>
    <!--eureka-server-->
    <dependency>
        <groupId>org.springframework.cloud</groupId>
        <artifactId>spring-cloud-starter-netflix-eureka-server</artifactId>
    </dependency>
    <!-- 引入自己定义的api通用包，可以使用Payment支付Entity -->
    <dependency>
        <groupId>org.mc.mycloud</groupId>
        <artifactId>cloud-api-commons</artifactId>
        <version>${project.version}</version>
    </dependency>
    <!--boot web actuator-->
    <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>
    <!--一般通用配置-->
    <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>
    </dependency>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-test</artifactId>
        <scope>test</scope>
    </dependency>
    <dependency>
        <groupId>junit</groupId>
        <artifactId>junit</artifactId>
    </dependency>
</dependencies>

b. application.yml

server:
  port: 7001

eureka:
  instance:
    hostname: eureka7001.com #eruka服务端实例
  client:
    register-with-eureka: false #false代表不让注册中心注册自己
    fetch-registry: false       #false表示自己就是注册中心，职责是维护服务实例，不需要检索服务
    service-url:
      #设置与eureka server 交互的地址查询服务和注册服务依赖地址
      #单机注册自己 集群注册自己以外的所有
      #单机：
      #defaultZone: http://eureka7001.com:7001/eureka/
      #集群
      defaultZone: http://eureka7002.com:7002/eureka/
  server:
    #关闭自我保护机制 保证不可用服务被及时剔除
    enable-self-preservation: false
    #2秒后删除不可以用服务 默认90秒
    eviction-interval-timer-in-ms: 2000

c. 主启动

@SpringBootApplication
@EnableEurekaServer //启用eureka服务器注解
public class EurekaMain7001 {

    public static void main(String[] args) {
        SpringApplication.run(EurekaMain7001.class, args);
    }
}

3. 服务提供者子模块

a. pom 依赖

<dependencies>
        <!--包含了sleuth+zipkin-->
   <!--     <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-zipkin</artifactId>
        </dependency>-->
        <!--eureka-client-->
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
        </dependency>
        <dependency><!-- 引入自己定义的api通用包，可以使用Payment支付Entity -->
            <groupId>org.mc.mycloud</groupId>
            <artifactId>cloud-api-commons</artifactId>
            <version>${project.version}</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>
            <version>1.1.10</version>
        </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>
        <dependency>
            <groupId>org.mc.mycloud</groupId>
            <artifactId>cloud-api-commons</artifactId>
            <version>1.0-SNAPSHOT</version>
            <scope>compile</scope>
        </dependency>
    </dependencies>

b. application.yml

server:
  port: 8001  #端口号

spring:
  application:
    name: cloud-payment-service
  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/db2019?useUnicode=true&characterEncoding=utf-8&useSSL=false
    username: root
    password: aion
    
mybatis:
  mapperLocations: classpath:mapper/*.xml
  type-aliases-package: org.mc.mycloud.entities    # 所有Entity别名类所在包

eureka:
  client:
    #表示是否将自己注册进EurekaServer默认为true。
    register-with-eureka: true
    #是否从EurekaServer抓取已有的注册信息，默认为true。单节点无所谓，集群必须设置为true才能配合ribbon使用负载均衡
    fetchRegistry: true
    service-url:
      #单机版
      defaultZone: http://localhost:7001/eureka
#      defaultZone: http://eureka7001.com:7001/eureka,http://eureka7002.com:7002/eureka
#  	集群：高可用，轮询模式
      #主机名称 服务修改
  instance:
    instance-id: payment8001
#    #访问路径可以显示IP地址
    prefer-ip-address: true
#    Eureka客户端向服务端发送心跳的时间间隔，单位为秒(默认是30秒)
    lease-renewal-interval-in-seconds: 1
#    Eureka服务端在收到最后一次心跳后等待时间上限，单位为秒(默认是90秒)，超时将剔除服务
    lease-expiration-duration-in-seconds: 2

c. 主启动

@SpringBootApplication
@EnableEurekaClient  //启动eureka客户端注解
@EnableDiscoveryClient  //启用客户端发现 
public class PaymentMain8001 {
    public static void main(String[] args) {
        SpringApplication.run(PaymentMain8001.class, args);
    }
}

d. 实体类

@Data
@AllArgsConstructor
@NoArgsConstructor
public class Payment implements Serializable
{
    private Long id;
    private String serial;
}

@Data
@AllArgsConstructor
@NoArgsConstructor 
public class CommonResult<T>  //统一返回结果实体类
{
    private Integer code; 
    private String  message;
    private T       data;

    public CommonResult(Integer code,String message)
    {
        this(code,message,null);
    }
}

e. 流程代码

dao：

@Mapper
public interface PaymentDao
{
    public int creat(Payment payment);

    public Payment getPaymentById(@Param("id") Long id);


}

xml：

<mapper namespace="org.mc.mycloud.dao.PaymentDao">
    <insert id="creat" parameterType="Payment" useGeneratedKeys="true" keyProperty="id">
        insert into payment(serial) values(#{serial})
    </insert>

    <resultMap id="BaseResultMap" type="org.mc.mycloud.entities.Payment">
        <id column="id" property="id" jdbcType="BIGINT"/>
        <id column="serial" property="serial" jdbcType="VARCHAR"/>
    </resultMap>
    <select id="getPaymentById" parameterType="long" resultMap="BaseResultMap">
        select * from payment where id =#{id}
    </select>
</mapper>

service：

public interface PaymentService
{
    public int creat(Payment payment);

    public Payment getPaymentById(@Param("id") Long id);
}

@Service
public class PaymentServiceImpl implements PaymentService {
    @Resource
    private PaymentDao paymentDao;

    @Override
    public int creat(Payment payment) {
        return paymentDao.creat(payment);
    }

    @Override
    public Payment getPaymentById(Long id) {
        return paymentDao.getPaymentById(id);
    }
}

controller:

@RestController
@Slf4j
public class PaymentController {

    @Resource
    private PaymentService paymentService;

    @Value("${server.port}")
    private String serverPort;

 /*   @Resource
    private DiscoveryClient discoveryClient;*/

    @PostMapping(value = "/payment/creat")
    public CommonResult creat(@RequestBody Payment payment) {
        int result = paymentService.creat(payment);
        log.info("*****插入结果：" + result);
        if (result > 0) {
            return new CommonResult(200, "插入数据库成功, serverPort:" + serverPort, result);
        } else {
            return new CommonResult(444, "插入数据库失败, serverPort:" + serverPort, null);
        }
    }

    @GetMapping(value = "/payment/get/{id}")
    public CommonResult getPaymentById(@PathVariable("id") Long id) {
        Payment payment = paymentService.getPaymentById(id);
        log.info("*****查询结果：" + payment);

        if (payment != null) {
            return new CommonResult(200, "查询数据库成功, serverPort:" + serverPort, payment);
        } else {
            return new CommonResult(444, "查询数据库失败, serverPort:" + serverPort + " id：" + id, null);
        }
    }

 /*   @GetMapping("/payment/discovery")
    public Object discovery() {
        //得到服务清单列表
        List<String> services = discoveryClient.getServices();
        for (String service : services) {
            log.info("*****service:"+service);
        }
        //根据服务名称获得服务信息实例
        List<ServiceInstance> instances = discoveryClient.getInstances("CLOUD-PAYMENT-SERVICE");
        for (ServiceInstance instance : instances) {
            log.info(instance.getServiceId()+"\t"+instance.getHost()+"\t"+instance.getPort()+"\t"+instance.getUri());
        }
        return this.discoveryClient;
    }*/
}

f. 结果

{
  "code": 200,
  "message": "查询数据库成功, serverPort:8001",
  "data": {
    "id": 1,
    "serial": "payment支付8001"
  }
}

4. 消费者子模块

a. pom依赖

 <dependencies>
<!--        &lt;!&ndash;包含了sleuth+zipkin&ndash;&gt;
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-zipkin</artifactId>
        </dependency>-->
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
        </dependency>
        <dependency><!-- 引入自己定义的api通用包，可以使用Payment支付Entity -->
            <groupId>org.mc.mycloud</groupId>
            <artifactId>cloud-api-commons</artifactId>
            <version>${project.version}</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>
    </dependencies>

b. appliaction.yml

server:
  port: 80

spring:
  application:
    name: cloud-consumer-order

eureka:
  client:
    #表示是否将自己注册进EurekaServer默认为true。
    register-with-eureka: true
    #是否从EurekaServer抓取已有的注册信息，默认为true。单节点无所谓，集群必须设置为true才能配合ribbon使用负载均衡
    fetchRegistry: true
    service-url:
      #单机版
#      defaultZone: http://localhost:7001/eureka
      # 集群版
      defaultZone: http://eureka7001.com:7001/eureka,http://eureka7002.com:7002/eureka
      #主机名称 服务修改
  instance:
    instance-id: order80
    #访问路径可以显示IP地址
    prefer-ip-address: true
#    #Eureka客户端向服务端发送心跳的时间间隔，单位为秒(默认是30秒)
#    #lease-renewal-interval-in-seconds: 1
#    #Eureka服务端在收到最后一次心跳后等待时间上限，单位为秒(默认是90秒)，超时将剔除服务
#    #lease-expiration-duration-in-seconds: 2

c. 主启动

@SpringBootApplication
@EnableEurekaClient //作为eureka 客户端
public class OrderMain80 {

    public static void main(String[] args) {
        SpringApplication.run(OrderMain80.class, args);
    }
}

d. 开启负载均衡

@Configuration
public class ApplicationContextConfig {
    @Bean
    @LoadBalanced //开启负载均衡
    public RestTemplate getRestTemplate() {
        return new RestTemplate();
    }
}

e. 流程代码

@RestController
@Slf4j
public class OrderController {
//    public static final String PAYMENT_URL = "http://localhost:8001";
    //使用服务提供实例名称来实现集群时对服务提供者的选择
    public static final String PAYMENT_URL = "http://CLOUD-PAYMENT-SERVICE";

    @Resource
    private RestTemplate restTemplate;

    @PostMapping("/consumer/payment/creat")
    public CommonResult<Payment> creat(Payment payment) {
        log.info("****消费者数据库插入：80");
        return restTemplate.postForObject(PAYMENT_URL + "/payment/creat", payment, CommonResult.class);
    }

    @GetMapping("/consumer/payment/get/{id}")
    public CommonResult<Payment> getPaymentById(@PathVariable("id") Long id) {
        log.info("****消费者数据库查询：80 哈哈哈 id："+id);
        return restTemplate.getForObject(PAYMENT_URL + "/payment/get/" + id, CommonResult.class);
    }


/**/
}

f. 结果

{
  "code": 200,
  "message": "查询数据库成功, serverPort:8001",
  "data": {
    "id": 1,
    "serial": "payment支付8001"
  }
}

5. 总结

a. 客户端集群访问机制？

轮循

b. 为何集群？

高可用避免宕机造成服务不可用提高容错

c. 服务端和客服端注解：

@EnableEurekaServer //服务端

@EnableEurekaClient //客户端

d. 开启负载均衡：

@LoadBalanced注解

@LoadBalanced //开启负载均衡
public RestTemplate getRestTemplate() {
    return new RestTemplate();
}

e. 集群时消费者端配置地址为：

服务提供者实例名称

public static final String PAYMENT_URL = "http://CLOUD-PAYMENT-SERVICE";

f. eureka服务端yml

eureka:
  instance:
    hostname: eureka7001.com #eruka服务端实例
  client:
    register-with-eureka: false #false代表不让注册中心注册自己
    fetch-registry: false       #false表示自己就是注册中心，职责是维护服务实例，不需要检索服务
    service-url:
      #设置与eureka server 交互的地址查询服务和注册服务依赖地址
      #单机注册自己 集群注册自己以外的所有
      #单机：
      #defaultZone: http://eureka7001.com:7001/eureka/
      #集群
      defaultZone: http://eureka7002.com:7002/eureka/
  server:
    #关闭自我保护机制 保证不可用服务被及时剔除
    enable-self-preservation: false
    #2秒后删除不可以用服务 默认90秒
    eviction-interval-timer-in-ms: 2000

g. eureka客户端yml

eureka:
  client:
    #表示是否将自己注册进EurekaServer默认为true。
    register-with-eureka: true
    #是否从EurekaServer抓取已有的注册信息，默认为true。单节点无所谓，集群必须设置为true才能配合ribbon使用负载均衡
    fetchRegistry: true
    service-url:
      #单机版
      defaultZone: http://localhost:7001/eureka
#      defaultZone: http://eureka7001.com:7001/eureka,http://eureka7002.com:7002/eureka
      #主机名称 服务修改
  instance:
    instance-id: payment8001
#    #访问路径可以显示IP地址
    prefer-ip-address: true
#    Eureka客户端向服务端发送心跳的时间间隔，单位为秒(默认是30秒)
    lease-renewal-interval-in-seconds: 1
#    Eureka服务端在收到最后一次心跳后等待时间上限，单位为秒(默认是90秒)，超时将剔除服务
    lease-expiration-duration-in-seconds: 2

h. 服务端自我保护机制关闭

enable-self-preservation: false

i. 服务发现注解

主启动添加

@EnableDiscoveryClient //服务发现注解

j: 服务端集群方式：

互相注册

#单机注册自己：
#defaultZone: http://eureka7001.com:7001/eureka/
#集群注册其他
defaultZone: http://eureka7002.com:7002/eureka/

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版权归属：AkaChou

许可证：署名 4.0 国际 (CC-BY-4.0)

SpringBoot4合集

Spring Cloud

linux基础

SpringCloud 学习笔记 01 --eureka

1. 新建maven父工程

父工程pom依赖

2. eureka服务端子模块

a. pom 依赖

b. application.yml

c. 主启动

3. 服务提供者子模块

a. pom 依赖

b. application.yml

c. 主启动

d. 实体类

e. 流程代码

dao：

xml：

service：

controller:

f. 结果

4. 消费者子模块

a. pom依赖

b. appliaction.yml

c. 主启动

d. 开启负载均衡

e. 流程代码

f. 结果

5. 总结

a. 客户端集群访问机制？

b. 为何集群？

c. 服务端和客服端注解：

d. 开启负载均衡：

e. 集群时消费者端配置地址为：

f. eureka服务端yml

g. eureka客户端yml

h. 服务端自我保护机制关闭

i. 服务发现注解

j: 服务端集群方式：

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