题外话:
紧接着上篇博文https://blog.csdn.net/qq_33371766/article/details/82253987 实现该demo。
保持zookeeper启动和Tomcat启动
二.实现dubbo的demo
我这边是使用springboot创建的多模块项目。(多模块的实现跨越参考我的另外一篇博文:https://blog.csdn.net/qq_33371766/article/details/80716837)
目录结构:
项目中的application这个模块是springboot的启动类,这里的demo暂时用不到,可以忽略。
dubbo-consumer:调用远程服务.
dubbo-consumer2:也是调用远程服务.
dubbo-interface:存放公共接口.
dubbo-provider:提供远程服务.
我自己的理解是:
1.dubbo-interface编写接口类,提供需要实现的方法接口。
2.dubbo-provider现实上面的接口,编写具体的业务代码,并且将服务暴露出来(启动起来)。
3.dubbo-consumer直接使用上面的接口提供的方法,得到自己想要的最终结果。
4.dubbo-consumer2也是调用远程服务,同步骤3,只是为了体现多消费者调用接口。
代码的实现。
1.my-dubbo的pom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.cxb</groupId>
<artifactId>my-dubbo</artifactId>
<version>0.0.1-SNAPSHOT</version>
<modules>
<module>dubbo-provider</module>
<module>dubbo-consumer</module>
<module>dubbo-consumer2</module>
<module>application</module>
<module>dubbo-interface</module>
</modules>
<packaging>pom</packaging>
<name>my-dubbo</name>
<description>Demo project for Spring Boot</description>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.0.2.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>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-jpa</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-jdbc</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</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
<!-- mybatis的分页插件 -->
<dependency>
<groupId>com.github.pagehelper</groupId>
<artifactId>pagehelper-spring-boot-starter</artifactId>
<version>1.2.3</version>
</dependency>
<dependency>
<groupId>org.mybatis.spring.boot</groupId>
<artifactId>mybatis-spring-boot-starter</artifactId>
<version>1.3.2</version>
</dependency>
<!-- https://mvnrepository.com/artifact/mysql/mysql-connector-java -->
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
</dependency>
<!-- https://mvnrepository.com/artifact/com.alibaba/dubbo -->
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>dubbo</artifactId>
<version>2.5.6</version>
</dependency>
<dependency>
<groupId>org.apache.zookeeper</groupId>
<artifactId>zookeeper</artifactId>
<version>3.4.12</version>
</dependency>
<dependency>
<groupId>com.101tec</groupId>
<artifactId>zkclient</artifactId>
<version>0.10</version>
</dependency>
</dependencies>
</project>
2.dubbo-interface的pom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">
<parent>
<artifactId>my-dubbo</artifactId>
<groupId>com.cxb</groupId>
<version>0.0.1-SNAPSHOT</version>
</parent>
<modelVersion>4.0.0</modelVersion>
<artifactId>dubbo-interface</artifactId>
</project>
3.编写公共接口:
package com.cxb.mydubbo;
import java.util.List;
/**
* Created by 81046 on 2018-08-31
*/
public interface DubboService {
List<String> getPermissions(Long id);
}
4.dubbo-provider的pom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">
<parent>
<artifactId>my-dubbo</artifactId>
<groupId>com.cxb</groupId>
<version>0.0.1-SNAPSHOT</version>
</parent>
<modelVersion>4.0.0</modelVersion>
<artifactId>dubbo-provider</artifactId>
<dependencies>
<dependency>
<groupId>com.cxb</groupId>
<artifactId>dubbo-interface</artifactId>
<version>0.0.1-SNAPSHOT</version>
</dependency>
</dependencies>
</project>
5.接口的具体实现类DubboServiceImpl:
package com.cxb.mydubbo;
import java.util.ArrayList;
import java.util.List;
/**
* Created by 81046 on 2018-08-31
*/
public class DubboServiceImpl implements DubboService{
//这里只是模拟数据,根据自己的实际业务编写
@Override
public List<String> getPermissions(Long id) {
List<String> demo = new ArrayList<>();
demo.add(String.format("Permission_%d", id - 1));
demo.add(String.format("Permission_%d", id));
demo.add(String.format("Permission_%d", id + 1));
return demo;
}
}
6.1 提供服务Provider:
package com.cxb.mydubbo;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import java.io.IOException;
/**
* Created by 81046 on 2018-08-31
*/
public class Provider {
public static void main(String[] args) throws IOException {
ClassPathXmlApplicationContext context = new ClassPathXmlApplicationContext("provider.xml");
System.out.println(context.getDisplayName() + ": here");
context.start();
System.out.println("服务已经启动...");
System.in.read();
}
}
6.2 这里还需要provider.xml。在xml文件中指定zookeeper和接口信息。
<?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">
<!--定义了提供方应用信息,用于计算依赖关系;在 dubbo-admin 或 dubbo-monitor 会显示这个名字,方便辨识-->
<dubbo:application name="demotest-provider" owner="programmer" organization="dubbox"/>
<!--使用 zookeeper 注册中心暴露服务,注意要先开启 zookeeper-->
<dubbo:registry address="zookeeper://localhost:2181"/>
<!-- 用dubbo协议在20880端口暴露服务 -->
<dubbo:protocol name="dubbo" port="20880" />
<!--使用 dubbo 协议实现定义好的 api.PermissionService 接口-->
<dubbo:service interface="com.cxb.mydubbo.DubboService" ref="demoService" protocol="dubbo" />
<!--具体实现该接口的 bean-->
<bean id="demoService" class="com.cxb.mydubbo.DubboServiceImpl"/>
</beans>
7.1 消费者Consumer去使用上面提供的服务Consumer:
package com.cxb.mydubbo;
import org.springframework.context.support.ClassPathXmlApplicationContext;
/**
* Created by 81046 on 2018-08-31
*/
public class Consumer {
public static void main(String[] args) {
//测试常规服务
ClassPathXmlApplicationContext context =
new ClassPathXmlApplicationContext("consumer.xml");
context.start();
System.out.println("consumer start");
DubboService demoService = context.getBean(DubboService.class);
System.out.println("consumer");
System.out.println(demoService.getPermissions(1L));
}
}
7.2 这里也需要consumer.xml,这里是需要指定链接的zookeeper地址和服务地址
<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">
<dubbo:application name="demotest-consumer" owner="programmer" organization="dubbox"/>
<!--向 zookeeper 订阅 provider 的地址,由 zookeeper 定时推送-->
<dubbo:registry address="zookeeper://localhost:2181"/>
<!--使用 dubbo 协议调用定义好的 api.PermissionService 接口-->
<dubbo:reference id="permissionService" interface="com.cxb.mydubbo.DubboService"/>
</beans>
测试:1.先运行6.1的Provider的main方法,启动服务。
2.再运行7.1的main方法,消费者使用上面提供的服务。
Dubbo管理控制台介绍
管理控制台功能:
路由规则,动态配置,服务降级
访问控制,权重调整
负载均衡
这里是Tomcat启动的页面,这里可以查看提供的公共的接口。
消费者调用的结果:
自此一个简单的dubbo的demo就实现了。