Dubbo、Zookeeper整合分布式服务操作

Zookeepe负责服务的注册，Dubbo负责服务之间的通讯

主要步骤：

0.新建一个空项目

1.新建一个SpringBoot模块，导入SpringWeb依赖

2.导入以下依赖，因为Dubbo没有固定的生态，所以只能自己写，或者使用第三方库，dubbo需要依赖curator等包，而zkClient是一个第三方库

<dependency>
	<groupId>org.apache.dubbo</groupId>
	<artifactId>dubbo-spring-boot-starter</artifactId>
	<version>2.7.3</version>
	<exclusions>
		<exclusion>
			<groupId>org.slf4j</groupId>
			<artifactId>slf4j-log4j12</artifactId>
		</exclusion>
	</exclusions>
</dependency>
<dependency>
	<groupId>org.apache.dubbo</groupId>
	<artifactId>dubbo</artifactId>
	<version>2.7.3</version>
</dependency>
<dependency>
	<groupId>org.apache.curator</groupId>
	<artifactId>curator-framework</artifactId>
	<version>4.0.1</version>
</dependency>
<dependency>
	<groupId>org.apache.curator</groupId>
	<artifactId>curator-recipes</artifactId>
	<version>2.8.0</version>
</dependency>
<dependency>
	<groupId>org.apache.zookeeper</groupId>
	<artifactId>zookeeper</artifactId>
	<version>3.4.13</version>
	<type>pom</type>
	<exclusions>
		<exclusion>
			<groupId>org.slf4j</groupId>
			<artifactId>slf4j-log4j12</artifactId>
		</exclusion>
	</exclusions>
</dependency>
<dependency>
	<groupId>com.101tec</groupId>
	<artifactId>zkclient</artifactId>
	<version>0.10</version>
</dependency>

3.编写一个服务接口，服务实现

TicketService

package cn.steveyu.providerdemo.service;

public interface TicketService {
    String getTicket();
}

TicketServiceImpl

package cn.steveyu.providerdemo.service;

import org.apache.dubbo.config.annotation.Service;

@Service
public class TicketServiceImpl implements TicketService {
    @Override
    public String getTicket() {
        return "ticket";
    }
}

@Service是org.apache.dubbo包中的，并不是Spring的中的Service，主要负责服务之间的通讯，如果在另外一个模块中调用，则要编写一个同样的接口。

4.现在修改Zookeeper配置

zoo.cfg

# The number of milliseconds of each tick
tickTime=2000
# The number of ticks that the initial 
# synchronization phase can take
initLimit=10
# The number of ticks that can pass between 
# sending a request and getting an acknowledgement
syncLimit=5
# the directory where the snapshot is stored.
# do not use /tmp for storage, /tmp here is just 
# example sakes.
dataDir=/Users/steveyu/Downloads/apache-zookeeper-3.5.7-bin/dataDir
# the port at which the clients will connect
clientPort=2181

dataDir是存储的目录，clientPort是端口通讯。

执行，开启zk注册中心

./apache-zookeeper-3.5.7-bin/bin/zkServer.sh start

5.开启dubbo-admin监控设备

https://github.com/apache/dubbo-admin

进入上面地址，clone一下。进入dubbo-admin进行打包

mvn package

开启dubbo监控设备，进入localhost:7001

点击服务治理，无服务

6.配置application.properties

server.port=8002

# dubbo提供者的别名，只是个标识
dubbo.application.name=provider-server
# zk地址
dubbo.registry.address=zookeeper://localhost:2181
# dubbo协议
dubbo.protocol.name=dubbo
# duboo端口号
dubbo.protocol.port=10057
# 这是你要发布到dubbo的接口所在包位置
dubbo.scan.base-packages=cn.steveyu.providerdemo.service


# log设置
logging.level.root=info
logging.file.name=log/system-run-dev.log

启动该Spring项目，进入7001端口，发现注册生效

7.编写服务端

我们需要在同样的包内，引入相同的接口

package cn.steveyu.providerdemo.service;

public interface TicketService {
    String getTicket();
}

写一个服务调用

接口

package cn.steveyu.consumerdemo.service;


public interface GetTicket {
    String getTicket();
}

实现

package cn.steveyu.consumerdemo.service;

import cn.steveyu.providerdemo.service.TicketService;
import org.apache.dubbo.config.annotation.Reference;
import org.apache.dubbo.config.annotation.Service;
import org.springframework.stereotype.Component;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;

@Service
@Component
@RequestMapping("123")
public class GetTicketImpl implements GetTicket{

    @Reference
    TicketService ticketService;

    @Override
    @ResponseBody
    @RequestMapping("123")
    public String getTicket() {
        return ticketService.getTicket();
    }
}

@Reference是一个进行远程装配的。直接调用即可，这边进行了RequestMapping，启动了一个Web服务。

8.启动服务端

服务生效

进行访问Web端口

成功