Dubbo快速入门

最新推荐文章于 2025-12-02 21:20:38 发布

转载最新推荐文章于 2025-12-02 21:20:38 发布 · 125 阅读

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原文链接：www.lagou.com

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#java #zookeeper #Dubbo

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h ttp://dubbo.apache.org/

1. 注册中心

1.1 Zookeeper

官方推荐使用zookeeper注册中心；

注册中心负责服务地址的注册与查找，相当于目录服务；

服务提供者和消费者只在启动时与注册中心交互，注册中不转发请求，压力较小；

Zookeeper是apache hadoop的子项目，是一个树形的目录服务，支持变更推送，适合作为dubbo的服务注册中心，工业强度较高，可用于生产环境；

1.2 安装

安装jdk

拷贝apache-zookeeper-3.6.0-bin.tar.gz到opt目录

解压安装包

[root@localhost opt]# tar -zxvf apache-zookeeper-3.6.0-bin.tar.gz

重命名

[root@localhost opt]# mv apache-zookeeper-3.6.0-bin zookeeper

在/opt/zookeeper/这个目录上创建zkData和zkLog目录

[root@localhost zookeeper]# mkdir zkData

[root@localhost zookeeper]# mkdir zkLog

进入/opt/zookeeper/conf这个路径，复制一份 zoo_sample.cfg 文件并命名为 zoo.cfg

[root@localhost conf]# cp zoo_sample.cfg zoo.cfg

编辑zoo.cfg文件，修改dataDir路径

dataDir=/opt/zookeeper/zkData

dataLogDir=/opt/zookeeper/zkLog

启动Zookeeper

[root@localhost bin]# ./zkServer.sh start

查看状态

[root@localhost bin]# ./zkServer.sh status

2. 服务提供方

1、一个空的maven项目

2、提供一个服务接口即可

2.1 服务方的pom.xml

各种依赖请严格按照下面的版本

<packaging>war</packaging>


<properties>
<spring.version>5.0.6.RELEASE</spring.version>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-webmvc</artifactId>
<version>${spring.version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-core</artifactId>
<version>${spring.version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-beans</artifactId>
<version>${spring.version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-context</artifactId>
<version>${spring.version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-context-support</artifactId>
<version>${spring.version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-tx</artifactId>
<version>${spring.version}</version>
</dependency>
<!--dubbo -->
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>dubbo</artifactId>
<version>2.5.7</version>
</dependency>
<dependency>
<groupId>org.apache.zookeeper</groupId>
<artifactId>zookeeper</artifactId>
<version>3.4.6</version>
</dependency>
<dependency>
<groupId>com.github.sgroschupf</groupId>
<artifactId>zkclient</artifactId>
<version>0.1</version>
</dependency>
<dependency>
<groupId>javassist</groupId>
<artifactId>javassist</artifactId>
<version>3.11.0.GA</version>
</dependency>
</dependencies>


<build>
<plugins>
<plugin>
<groupId>org.apache.tomcat.maven </groupId>
<artifactId>tomcat7-maven-plugin</artifactId>
<configuration>
<port>8001</port>
<path>/</path>
</configuration>
<executions>
<execution>
<!-- 打包完成后,运行服务 -->
<phase>package</phase>
<goals>
<goal>run</goal>
</goals>
</execution>
</executions>
</plugin>
</plugins>
</build>

2.2 服务方接口

public interface HelloService { String sayHello(String name);
}

2.3 服务方实现

@com.alibaba.dubbo.config.annotation.Service
public class HelloServiceImpl implements HelloService { @Override
public String sayHello(String name) { return "Hello," + name + "!!!";
}
}

2.4 服务方的配置文件spring.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.服务提供方在zookeeper中的“别名”-->
<dubbo:application name="dubbo-server"/>
<!--2.注册中心的地址-->
<dubbo:registry address="zookeeper://192.168.204.141:2181"/>
<!--3.扫描类（将什么包下的类作为服务提供类）-->
<dubbo:annotation package="service.impl"/>
</beans>

2.5 服务方的web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://xmlns.jcp.org/xml/ns/javaee" xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee
http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd" id="WebApp_ID" version="3.1">
<listener>
<listener- class>org.springframework.web.context.ContextLoaderListener</listener-class>
</listener>
<context-param>
<param-name>contextConfigLocation</param-name>
<param-value>classpath:spring/spring.xml</param-value>
</context-param>
</web-app>

3. 服务消费方

3.1 消费方的pom.xml

与服务方一致，只需要修改tomcat的端口为8002

3.2 消费方的Controller

@RestController
public class HelloAction { @com.alibaba.dubbo.config.annotation.Reference private HelloService hs; @RequestMapping("hello")
@ResponseBody
public String hello( String name){ return hs.sayHello(name);
}
}

3.3 消费方的接口

注意：

controller中要依赖HelloService，所以我们创建一个接口；

这里是消费方，不需要实现，因为实现会让服务方为我们搞定！

public interface HelloService { String sayHello(String name);
}

3.4 消费方的web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://xmlns.jcp.org/xml/ns/javaee" xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee
http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd" id="WebApp_ID" version="3.1">

<servlet>
<servlet-name>springmvc</servlet-name>
<servlet- class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<init-param>
<param-name>contextConfigLocation</param-name>
<param-value>classpath:spring/spring.xml</param-value>
</init-param>
</servlet>
<servlet-mapping>
<servlet-name>springmvc</servlet-name>
<url-pattern>/</url-pattern>
</servlet-mapping>

</web-app>

3.5 消费方的springmvc.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的应用名称，通常使用项目名 -->
<dubbo:application name="dubbo-consumer" />
<!--配置Dubbo的注册中心地址 -->
<dubbo:registry address="zookeeper://192.168.204.141:2181" />
<!--配置Dubbo扫描类，将这个类作为服务进行发布 -->
<dubbo:annotation package="controller" />
</beans>