1. Dubbo介绍

示例代码：Github

1.1 RPC

Remote Procedure Call：远程过程调用

1.2 Dubbo架构

Subscribe 订阅；签署；赞成

Monitor 监听器；监控器

1.3 Dubbo在Zookeeper中注册信息的结构

2. Dubbo使用

2.1 创建Common工程

group id：com.joker.dubbo

artifact id：dubbo-common

package：jar

创建实体类

com.joker.dubbo.entity.Employee.java

package com.joker.dubbo.entity;

import java.io.Serializable;

public class Employee implements Serializable {

    private static final long serialVersionUID = 1L;

    private Integer empId;

    private String empName;

    private Double salary;

    public Employee() {

    }

    public Employee(Integer empId, String empName, Double salary) {

        this.empId = empId;

        this.empName = empName;

        this.salary = salary;

    }

    // getter、setter略

}

创建远程调用的接口

package com.joker.dubbo.service.EmployeeRemoteService.java

package com.joker.dubbo.service;

import com.joker.dubbo.entity.Employee;

import java.util.List;

public interface EmployeeRemoteService {

    List<Employee> getEmployeeByConditionRemote(Employee employee);

}

2.2 创建Provider工程

group id：com.joker.dubbo

artifact id：dubbo-provider

package：war

依赖于：Common工程，使用其中的实体类和接口

依赖信息

pom.xml

<dependencies>

    <!-- 依赖于dubbo-common -->

    <dependency>

        <groupId>com.joker.dubbo</groupId>

        <artifactId>dubbo-common</artifactId>

        <version>1.0-SNAPSHOT</version>

    </dependency>

    <dependency>

        <groupId>cglib</groupId>

        <artifactId>cglib</artifactId>

        <version>2.2</version>

    </dependency>

    <dependency>

        <groupId>org.aspectj</groupId>

        <artifactId>aspectjweaver</artifactId>

        <version>1.6.8</version>

    </dependency>

    <dependency>

        <groupId>com.alibaba</groupId>

        <artifactId>dubbo</artifactId>

        <version>2.5.5</version>

    </dependency>

    <dependency>

        <groupId>com.github.sgroschupf</groupId>

        <artifactId>zkclient</artifactId>

        <version>0.1</version>

    </dependency>

</dependencies>

配置log4j日志文件

log4j.properties

log4j.rootLogger=DEBUG,myConsole

log4j.appender.myConsole=org.apache.log4j.ConsoleAppender

log4j.appender.myConsole.Target=System.out

log4j.appender.myConsole.layout=org.apache.log4j.PatternLayout

log4j.appender.myConsole.layout.ConversionPattern=[%-5p] %d(%r) --> [%t] %l: %m %x %n

配置web.xml

web.xml

<?xml version="1.0" encoding="UTF-8"?>

<web-app xmlns="http://java.sun.com/xml/ns/javaee"

         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

         xsi:schemaLocation="http://java.sun.com/xml/ns/javaee

		  http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"

         version="3.0">

    <context-param>

        <param-name>contextConfigLocation</param-name>

        <param-value>classpath:spring-dubbo.xml</param-value>

    </context-param>

    <listener>

        <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>

    </listener>

</web-app>

Spring配置文件中Dubbo的配置

spring-dubbo.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">

    <!-- Dubbo配置：指定当前Web应用名称，便于在注册中心中注册 -->

    <dubbo:application name="dubbo-provider"/>

    <!-- Dubbo配置：指定注册中心的种类以及位置 -->

    <dubbo:registry protocol="zookeeper" address="192.168.252.128" port="2181"/>

    <!-- Dubbo配置：指定Dubbo的Provider本身监听的端口号 consumer访问时要使用这个端口号-->

    <dubbo:protocol name="dubbo" port="20880"/>

    <!-- 配置接口实现类的bean -->

    <bean id="employeeRemoteServiceImpl" class="com.joker.dubbo.service.impl.EmployeeRemoteServiceImpl"/>

    <!-- Dubbo配置：给远程方法接口指定实现类 -->

    <dubbo:service interface="com.joker.dubbo.service.EmployeeRemoteService" ref="employeeRemoteServiceImpl"/>

</beans>

创建远程调用接口的实现类

com.joker.dubbo.service.impl.EmployeeRemoteServiceImpl.java

package com.joker.dubbo.service.impl;

import com.joker.dubbo.entity.Employee;

import com.joker.dubbo.service.EmployeeRemoteService;

import java.util.ArrayList;

import java.util.List;

/**

 * @PackageName:com.joker.dubbo.service.impl

 * @Date:2019/10/18 14:02

 * @Author: zsy

 */

public class EmployeeRemoteServiceImpl implements EmployeeRemoteService {

    @Override

    public List<Employee> getEmployeeByConditionRemote(Employee employee) {

        System.out.println("***provider***:" + employee);

        // 假数据用于数据测试

        List<Employee> empList = new ArrayList<>();

        empList.add(new Employee(111, "empName111", 111.11));

        empList.add(new Employee(222, "empName222", 222.22));

        empList.add(new Employee(333, "empName333", 333.33));

        return empList;

    }

}

注册简单测试

运行web项目，启动tomcat服务器，尝试连接Zookeeper，此时要确保服务器Zookeeper已启动

启动成功可以看到控制台日志打印心跳检查信息：

[2019-10-18 02:19:51,355] Artifact dubbo-provider:war exploded: Artifact is deployed successfully

[2019-10-18 02:19:51,355] Artifact dubbo-provider:war exploded: Deploy took 24,538 milliseconds

[DEBUG] 2019-10-18 14:20:01,235(31554) --> [RMI TCP Connection(192.168.252.128:2181)] org.apache.zookeeper.ClientCnxn$SendThread.readResponse(ClientCnxn.java:758): Got ping response for sessionid: 0x16ddd844d9a0000 after 2ms

[DEBUG] 2019-10-18 14:20:11,241(41560) --> [RMI TCP Connection(192.168.252.128:2181)] org.apache.zookeeper.ClientCnxn$SendThread.readResponse(ClientCnxn.java:758): Got ping response for sessionid: 0x16ddd844d9a0000 after 2ms

此时到服务器端启动Zookeeper客户端：

/opt/zookeeper3.4.9/bin/zkCli.sh

#启动后查看是否已经注册上provider的信息

[zk: localhost:2181(CONNECTED) 0] ls /

[animal, dubbo, zookeeper, fruits]

[zk: localhost:2181(CONNECTED) 1] ls /dubbo

[com.joker.dubbo.service.EmployeeRemoteService]

[zk: localhost:2181(CONNECTED) 2] ls /dubbo/com.joker.dubbo.service.EmployeeRemoteService

[configurators, providers]

[zk: localhost:2181(CONNECTED) 3] ls /dubbo/com.joker.dubbo.service.EmployeeRemoteService/providers

[dubbo%3A%2F%2F192.168.252.1%3A20880%2Fcom.joker.dubbo.service.EmployeeRemoteService%3Fanyhost%3Dtrue%26application%3Ddubbo-provider%26dubbo%3D2.5.5%26generic%3Dfalse%26interface%3Dcom.joker.dubbo.service.EmployeeRemoteService%26methods%3DgetEmployeeByConditionRemote%26pid%3D6364%26revision%3D1.0-SNAPSHOT%26side%3Dprovider%26timestamp%3D1571379571726]

[zk: localhost:2181(CONNECTED) 4]

通过ls /dubbo/com.joker.dubbo.service.EmployeeRemoteService/providers我们看到下面注册的provider，通过Url解码得到内容：

dubbo://192.168.252.1:20880/com.joker.dubbo.service.EmployeeRemoteService?anyhost=true&application=dubbo-provider&dubbo=2.5.5&generic=false&interface=com.joker.dubbo.service.EmployeeRemoteService&methods=getEmployeeByConditionRemote&pid=6364&revision=1.0-SNAPSHOT&side=provider&timestamp=1571379571726

至此，证明Provider配置成功！

2.3 创建Consumer工程

group id：com.joker.dubbo

artifact id：dubbo-consumer

package：war

依赖信息

pom.xml

<dependencies>

    <!-- 依赖于dubbo-common -->

    <dependency>

        <groupId>com.joker.dubbo</groupId>

        <artifactId>dubbo-common</artifactId>

        <version>1.0-SNAPSHOT</version>

    </dependency>

    <dependency>

        <groupId>cglib</groupId>

        <artifactId>cglib</artifactId>

        <version>2.2</version>

    </dependency>

    <dependency>

        <groupId>org.aspectj</groupId>

        <artifactId>aspectjweaver</artifactId>

        <version>1.6.8</version>

    </dependency>

    <dependency>

        <groupId>com.alibaba</groupId>

        <artifactId>dubbo</artifactId>

        <version>2.5.5</version>

    </dependency>

    <dependency>

        <groupId>com.github.sgroschupf</groupId>

        <artifactId>zkclient</artifactId>

        <version>0.1</version>

    </dependency>

    <!-- spring-mvc -->

    <dependency>

        <groupId>org.springframework</groupId>

        <artifactId>spring-webmvc</artifactId>

        <version>4.3.10.RELEASE</version>

    </dependency>

    <!-- jsp -->

    <dependency>

        <groupId>javax.servlet</groupId>

        <artifactId>servlet-api</artifactId>

        <version>2.5</version>

        <scope>provided</scope>

    </dependency>

    <dependency>

        <groupId>javax.servlet.jsp</groupId>

        <artifactId>jsp-api</artifactId>

        <version>2.1.3-b06</version>

        <scope>provided</scope>

    </dependency>

</dependencies>

配置log4j日志配置文件

log4j.properties

log4j.rootLogger=DEBUG,myConsole

log4j.appender.myConsole=org.apache.log4j.ConsoleAppender

log4j.appender.myConsole.Target=System.out

log4j.appender.myConsole.layout=org.apache.log4j.PatternLayout

log4j.appender.myConsole.layout.ConversionPattern=[%-5p] %d(%r) --> [%t] %l: %m %x %n

配置web.xml

web.xml

<?xml version="1.0" encoding="UTF-8"?>

<web-app xmlns="http://java.sun.com/xml/ns/javaee"

         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

         xsi:schemaLocation="http://java.sun.com/xml/ns/javaee

		  http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"

         version="3.0">

    <servlet>

        <servlet-name>springDispatcherServlet</servlet-name>

        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>

        <init-param>

            <param-name>contextConfigLocation</param-name>

            <param-value>classpath:spring-mvc.xml</param-value>

        </init-param>

        <load-on-startup>1</load-on-startup>

    </servlet>

    <servlet-mapping>

        <servlet-name>springDispatcherServlet</servlet-name>

        <url-pattern>/</url-pattern>

    </servlet-mapping>

</web-app>

配置SpringMVC

spring-mvc.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"

       xmlns:mvc="http://www.springframework.org/schema/mvc"

       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://code.alibabatech.com/schema/dubbo http://code.alibabatech.com/schema/dubbo/dubbo.xsd http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd">

    <!-- SpringMVC相关配置 -->

    <context:component-scan base-package="com.joker.dubbo.handler"/>

    <bean id="viewResolver" class="org.springframework.web.servlet.view.InternalResourceViewResolver">

        <property name="prefix" value="/WEB-INF/"/>

        <property name="suffix" value=".jsp"/>

    </bean>

    <mvc:annotation-driven/>

    <mvc:default-servlet-handler/>

    <!-- Dubbo配置：当前应用名称 -->

    <dubbo:application name="dubbo-consumer"/>

    <!-- Dubbo配置：指定Dubbo注册中心类型和位置 -->

    <dubbo:registry protocol="zookeeper" address="192.168.252.128" port="2181"/>

    <!-- Dubbo配置：引用Provider提供的可以远程调用的服务 -->

    <dubbo:reference id="employeeRemoteService" interface="com.joker.dubbo.service.EmployeeRemoteService"/>

</beans>

创建Handler类映射远程接口请求

com.joker.dubbo.handler.EmployeeHandler.java

package com.joker.dubbo.handler;

import com.joker.dubbo.entity.Employee;

import com.joker.dubbo.service.EmployeeRemoteService;

import org.springframework.beans.factory.annotation.Autowired;

import org.springframework.stereotype.Controller;

import org.springframework.web.bind.annotation.RequestMapping;

import java.util.List;

/**

 * @PackageName:com.joker.dubbo.handler

 * @Date:2019/10/18 14:51

 * @Author: zsy

 */

@Controller

public class EmployeeHandler {

    @Autowired

    EmployeeRemoteService employeeRemoteService;

    @RequestMapping("/get/emp/list")

    public String getEmpList() {

        Employee employee = new Employee(666, "empName666", 666.66);

        List<Employee> empList = employeeRemoteService.getEmployeeByConditionRemote(employee);

        for (Employee emp : empList) {

            System.out.println(emp);

        }

        return "success";

    }

}

创建返回成功页面

success.jsp

<%@ page contentType="text/html;charset=UTF-8" language="java" %>

<html>

<head>

    <title>Title</title>

</head>

<body>

	<h1> Success !</h1>

</body>

</html>

注册简单测试

运行consumer的web项目，启动一个新的tomcat服务器，并设置不同的端口号；

同provider，启动完成后可以看到控制台日志打印心跳检查信息：

[DEBUG] 2019-10-18 16:21:14,947(31499) --> [RMI TCP Connection(192.168.252.128:2181)] org.apache.zookeeper.ClientCnxn$SendThread.readResponse(ClientCnxn.java:758): Got ping response for sessionid: 0x16ddd844d9a000b after 3ms

[DEBUG] 2019-10-18 16:21:24,947(41499) --> [RMI TCP Connection(192.168.252.128:2181)] org.apache.zookeeper.ClientCnxn$SendThread.readResponse(ClientCnxn.java:758): Got ping response for sessionid: 0x16ddd844d9a000b after 1ms

[DEBUG] 2019-10-18 16:21:34,949(51501) --> [RMI TCP Connection(192.168.252.128:2181)] org.apache.zookeeper.ClientCnxn$SendThread.readResponse(ClientCnxn.java:758): Got ping response for sessionid: 0x16ddd844d9a000b after 1ms

此时到Zookeeper服务端查看服务注册信息：

[zk: localhost:2181(CONNECTED) 21] ls /dubbo/com.joker.dubbo.service.EmployeeRemoteService

[consumers, configurators, routers, providers]

[zk: localhost:2181(CONNECTED) 22]

这是可以看到Zookeeper注册中心不仅有providers，还有了新注册的consumers；

这时执行命令：ls /dubbo/com.joker.dubbo.service.EmployeeRemoteService/consumers

可以看到我们注册的consumer信息

[consumer%3A%2F%2F192.168.252.1%2Fcom.joker.dubbo.service.EmployeeRemoteService%3Fapplication%3Ddubbo-consumer%26category%3Dconsumers%26check%3Dfalse%26dubbo%3D2.5.5%26interface%3Dcom.joker.dubbo.service.EmployeeRemoteService%26methods%3DgetEmployeeByConditionRemote%26pid%3D13468%26revision%3D1.0-SNAPSHOT%26side%3Dconsumer%26timestamp%3D1571386846115]

通过URL解码可以看到：

consumer://192.168.252.1/com.joker.dubbo.service.EmployeeRemoteService?application=dubbo-consumer&category=consumers&check=false&dubbo=2.5.5&interface=com.joker.dubbo.service.EmployeeRemoteService&methods=getEmployeeByConditionRemote&pid=13468&revision=1.0-SNAPSHOT&side=consumer&timestamp=1571386846115

这里显示的是调用接口的消费者信息。

这时打开浏览器输出http://localhost:8081/consumer/get/emp/list

注意：本项目中配置consumer的tomcat端口号为8081

可以看到成功页面返回！

同时看到tomcat运行控制台打印信息：

consumer端：

Employee{empId=111, empName='empName111', salary=111.11}

Employee{empId=222, empName='empName222', salary=222.22}

Employee{empId=333, empName='empName333', salary=333.33}

provider端

***provider***:Employee{empId=666, empName='empName666', salary=666.66}

证明远程方法调用成功，consumer调用了远程方法，并传递给provider一个Employee对象。

provider成功接收，并执行getEmployeeByConditionRemote()方法，返回一个Employee的List。

至此，consumer配置成功！

Dubbo+Zookeeper实现远程调用成功！

返回！

同时看到tomcat运行控制台打印信息：

consumer端：

Employee{empId=111, empName='empName111', salary=111.11}

Employee{empId=222, empName='empName222', salary=222.22}

Employee{empId=333, empName='empName333', salary=333.33}

provider端

***provider***:Employee{empId=666, empName='empName666', salary=666.66}

证明远程方法调用成功，consumer调用了远程方法，并传递给provider一个Employee对象。

provider成功接收，并执行getEmployeeByConditionRemote()方法，返回一个Employee的List。

至此，consumer配置成功！

Dubbo+Zookeeper实现远程调用成功！

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Dubbo+Zookeeper实现简单的远程方法调用示例

1. Dubbo介绍

1.1 RPC

1.2 Dubbo架构

1.3 Dubbo在Zookeeper中注册信息的结构

2. Dubbo使用

2.1 创建Common工程

创建实体类

创建远程调用的接口

2.2 创建Provider工程

依赖信息

配置log4j日志文件

配置web.xml

Spring配置文件中Dubbo的配置

创建远程调用接口的实现类

注册简单测试

2.3 创建Consumer工程

依赖信息

配置log4j日志配置文件

配置web.xml

配置SpringMVC

创建Handler类映射远程接口请求

创建返回成功页面

注册简单测试

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