dubbo-spring
一、需求
某个电商系统,订单服务需要调用用户服务获取某个用户的所有地址;
创建两个服务模块进行测试

测试预期结果:订单服务web模块在A服务器,用户服务模块在B服务器,A可以远程调用B的功能。
二、工程架构
服务化最佳实践
1、分包
建议将服务接口、服务模型、服务异常等均放在 API 包中,因为服务模型和异常也是 API 的一部分,这样做也符合分包原则:重用发布等价原则(REP),共同重用原则(CRP)。
如果需要,也可以考虑在 API 包中放置一份 Spring 的引用配置,这样使用方只需在 Spring 加载过程中引用此配置即可。
配置建议放在模块的包目录下,以免冲突,如:com/alibaba/china/xxx/dubbo-reference.xml。
2、粒度
服务接口尽可能大粒度,每个服务方法应代表一个功能,而不是某功能的一个步骤,否则将面临分布式事务问题,Dubbo 暂未提供分布式事务支持。
服务接口建议以业务场景为单位划分,并对相近业务做抽象,防止接口数量爆炸。
不建议使用过于抽象的通用接口,如:Map query(Map),这样的接口没有明确语义,会给后期维护带来不便。
3、版本
每个接口都应定义版本号,为后续不兼容升级提供可能,如: <dubbo:service interface="com.xxx.XxxService" version="1.0" />。
建议使用两位版本号,因为第三位版本号通常表示兼容升级,只有不兼容时才需要变更服务版本。
当不兼容时,先升级一半提供者为新版本,再将消费者全部升为新版本,然后将剩下的一半提供者升为新版本。
4、兼容性
服务接口增加方法,或服务模型增加字段,可向后兼容,删除方法或删除字段,将不兼容,枚举类型新增字段也不兼容,需通过变更版本号升级。
二、创建模块

1、gmall-interface:公共接口层(model,service,exception…)
作用:定义公共接口,也可以导入公共依赖

pom.xml文件
<?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>com.lina02.gmall</groupId>
<artifactId>gmall-interface</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>jar</packaging>
<name>gmall-interface</name>
<description>Java Bean和服务接口</description>
<dependencies>
<!-- https://mvnrepository.com/artifact/org.projectlombok/lombok -->
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<version>1.16.20</version>
<scope>provided</scope>
</dependency>
</dependencies>
</project>
bean模型:
package com.lina02.gmall.bean;
import lombok.Data;
import java.io.Serializable;
/**
* 用户地址
*/
@Data
public class UserAddress implements Serializable {
private Integer id;
private String userAddress; //用户地址
private String userId; //用户id
private String consignee; //收货人
private String phoneNum; //电话号码
private String isDefault; //是否为默认地址 Y-是 N-否
public UserAddress() {
}
public UserAddress(Integer id, String userAddress, String userId, String consignee, String phoneNum, String isDefault) {
this.id = id;
this.userAddress = userAddress;
this.userId = userId;
this.consignee = consignee;
this.phoneNum = phoneNum;
this.isDefault = isDefault;
}
}
service接口:
1)、UserService接口
package com.lina02.gmall.service;
import com.lina02.gmall.bean.UserAddress;
import java.util.List;
/**
* 用户服务
*/
public interface UserService {
/**
* 按照用户id返回所有的收货地址
* @param userId
* @return
*/
public List<UserAddress> getUserAddressList(String userId);
}
2)、OrderService接口
package com.lina02.gmall.service;
import com.lina02.gmall.bean.UserAddress;
import java.util.List;
public interface OrderService {
/**
* 初始化订单
*/
public void initOrder(String userId);
}
2、user-service-provider:用户模块(对用户接口的实现)

pom.xml文件
<?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>com.lina02.gmall</groupId>
<artifactId>user-service-provider</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>jar</packaging>
<name>user-service-provider</name>
<description>服务提供者</description>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.0.6.RELEASE</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
<java.version>1.8</java.version>
</properties>
<dependencies>
<dependency>
<groupId>com.lina02.gmall</groupId>
<artifactId>gmall-interface</artifactId>
<version>0.0.1-SNAPSHOT</version>
</dependency>
<!-- 引入dubbo -->
<!-- https://mvnrepository.com/artifact/com.alibaba/dubbo -->
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>dubbo</artifactId>
<version>2.6.2</version>
</dependency>
<!-- 注册中心使用的是zookeeper,引入操作zookeeper的客户端端 -->
<dependency>
<groupId>org.apache.curator</groupId>
<artifactId>curator-framework</artifactId>
<version>2.12.0</version>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
</project>
UserService接口实现UserServiceImpl:
package com.lina02.gmall.service.impl;
import com.lina02.gmall.bean.UserAddress;
import com.lina02.gmall.service.UserService;
import java.util.Arrays;
import java.util.List;
public class UserServiceImpl implements UserService {
@Override
public List<UserAddress> getUserAddressList(String userId) {
UserAddress address1 = new UserAddress(1, "北京市昌平区宏福科技园综合楼3层", "1", "李老师", "010-56253825", "Y");
UserAddress address2 = new UserAddress(2, "深圳市宝安区西部硅谷大厦B座3层(深圳分校)", "1", "王老师", "010-56253825", "N");
return Arrays.asList(address1, address2);
}
}
dubbo服务提供者配置文件provider.xml
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:dubbo="http://code.alibabatech.com/schema/dubbo"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
http://code.alibabatech.com/schema/dubbo http://code.alibabatech.com/schema/dubbo/dubbo.xsd">
<!-- 1、指定当前服务/应用的名字(同样的服务名字相同,不要和别的服务同名) -->
<dubbo:application name="user-service-provider"></dubbo:application>
<!-- 2、指定注册中心的位置 -->
<!-- <dubbo:registry address="zookeeper://127.0.0.1:2181"></dubbo:registry> -->
<dubbo:registry protocol="zookeeper" address="127.0.0.1:2181"></dubbo:registry>
<!-- 3、指定通信规则(通信协议&通信端口) -->
<dubbo:protocol name="dubbo" port="20880"></dubbo:protocol>
<!-- 4、暴露服务 ref:指向服务的真正的实现对象 -->
<dubbo:service interface="com.lina02.gmall.service.UserService" ref="userServiceImpl"/>
<!-- 服务的实现 -->
<bean id="userServiceImpl" class="com.lina02.gmall.service.impl.UserServiceImpl"></bean>
</beans>
测试代码文件MainApplication
package com.lina02.gmall;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import java.io.IOException;
public class MainApplication {
public static void main(String[] args) throws IOException {
ClassPathXmlApplicationContext ioc = new ClassPathXmlApplicationContext("provider.xml");
ioc.start();
System.in.read();
}
}
3、order-service-consumer 订单模块(调用用户模块)

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>com.lina02.gmall</groupId>
<artifactId>order-service-consumer</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>jar</packaging>
<name>order-service-consumer</name>
<description>服务消费者</description>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.0.6.RELEASE</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
<java.version>1.8</java.version>
</properties>
<dependencies>
<dependency>
<groupId>com.lina02.gmall</groupId>
<artifactId>gmall-interface</artifactId>
<version>0.0.1-SNAPSHOT</version>
</dependency>
<!-- 引入dubbo -->
<!-- https://mvnrepository.com/artifact/com.alibaba/dubbo -->
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>dubbo</artifactId>
<version>2.6.2</version>
</dependency>
<!-- 注册中心使用的是zookeeper,引入操作zookeeper的客户端端 -->
<dependency>
<groupId>org.apache.curator</groupId>
<artifactId>curator-framework</artifactId>
<version>2.12.0</version>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
</project>
OrderService接口实现OrderServiceImpl:
package com.lina02.gmall.service.impl;
import com.lina02.gmall.bean.UserAddress;
import com.lina02.gmall.service.OrderService;
import com.lina02.gmall.service.UserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import java.util.List;
/**
* 1、将服务提供者注册到注册中心(暴露服务)
* 1)、导入dubbo依赖(2.6.2)\操作zookeeper的客户端(curator)
* 2)、配置服务提供者
*
* 2、让服务消费者去注册中心订阅服务提供者的服务地址
*/
@Service
public class OrderServiceImpl implements OrderService {
@Autowired
UserService userService;
@Override
public void initOrder(String userId) {
System.out.println("用户id:"+userId);
//1、查询用户的收货地址
List<UserAddress> addressList = userService.getUserAddressList(userId);
for (UserAddress userAddress : addressList) {
System.out.println(userAddress.getUserAddress());
}
}
}
dubbo服务消费者配置文件consumer.xml
<?xml version="1.0" encoding="UTF-8"?> <beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:dubbo="http://dubbo.apache.org/schema/dubbo" xmlns:context="http://www.springframework.org/schema/context" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.3.xsd http://dubbo.apache.org/schema/dubbo http://dubbo.apache.org/schema/dubbo/dubbo.xsd http://code.alibabatech.com/schema/dubbo http://code.alibabatech.com/schema/dubbo/dubbo.xsd"> <context:component-scan base-package="com.lina02.gmall.service.impl"></context:component-scan> <dubbo:application name="order-service-consumer"></dubbo:application> <dubbo:registry address="zookeeper://127.0.0.1:2181"></dubbo:registry> <!--声明需要调用的远程服务的接口;生成远程服务代理 --> <dubbo:reference interface="com.lina02.gmall.service.UserService" id="userService"> </dubbo:reference> </beans>
测试代码文件MainApplication
package com.lina02.gmall;
import com.lina02.gmall.service.OrderService;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import java.io.IOException;
public class MainApplication {
public static void main(String[] args) throws IOException {
ClassPathXmlApplicationContext ioc = new ClassPathXmlApplicationContext("consumer.xml");
OrderService orderService = ioc.getBean(OrderService.class);
orderService.initOrder("1");
System.out.println("调用完成....");
System.in.read();
}
}
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