dubbo入门

1.建立服务端

新建一个web工程，工程目录如下：

pom.xml配置

<dependencies>
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-context</artifactId>
        <version>4.3.11.RELEASE</version>
    </dependency>
    <dependency>
        <groupId>com.alibaba</groupId>
        <artifactId>dubbo</artifactId>
        <version>2.5.7</version>
    </dependency>
    <dependency>
        <groupId>org.apache.zookeeper</groupId>
        <artifactId>zookeeper</artifactId>
        <version>3.4.10</version>
    </dependency>
    <dependency>
        <groupId>com.github.sgroschupf</groupId>
        <artifactId>zkclient</artifactId>
        <version>0.1</version>
    </dependency>
</dependencies>
<build>
    <finalName>dubbo-server</finalName>
    <plugins>
        <plugin>
            <groupId>org.apache.tomcat.maven</groupId>
            <artifactId>tomcat7-maven-plugin</artifactId>
            <version>2.2</version>
            <configuration>
                <port>8080</port>
                <path>/</path>
            </configuration>
        </plugin>
    </plugins>
</build>

1.1      编写要发布的接口

package service;
//要发布的接口
public interface HelloService {
    //要发布的方法
    String sayHello();
}

1.2      实现接口功能

 

package service;

public class HelloServiceImpl implements HelloService {

    @Override
    public String sayHello() {
        return "HELLO DUBBO";
    }
}

 

1.1      发布服务

<?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">

    <bean id="helloServiceImpl" class="service.HelloServiceImpl"/>
    <!-- 发布dubbo服务 -->
    <!-- 提供方应用信息，用于计算依赖关系 -->
    <dubbo:application name="dubbo-server-test"/>
    <!-- 注册中心的地址 -->
    <dubbo:registry protocol="zookeeper" address="10.0.31.98:2181"/>
    <!-- 用dubbo协议在20880端口暴露服务 -->
    <dubbo:protocol name="dubbo" port="20880"/>
    <!-- 声明需要暴露的服务接口 -->
    <dubbo:service interface="service.HelloService" ref="helloServiceImpl" timeout="300000"/>
</beans>

1.4web.xml配置

<?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">

  <!--加载spring配置文件-->
  <context-param>
    <param-name>contextConfigLocation</param-name>
    <param-value>classpath:spring-service.xml</param-value>
  </context-param>
  <listener>
    <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
  </listener>
</web-app>

配置maven的tomcat插件，发布：

 

 

2. Dubbo管理后台

 

是dubbo的管理后台。

先关掉服务器的tomcat

上传到服务器的tomcat的wabapp目录下

启动tomcat。

http://服务器ip:8080/dubbo-admin-2.8.4/            

登录的用户名密码都是root

3.客户端

普通的java工程即可，使用main方法测试：

pom.xml配置：

<dependencies>
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-context</artifactId>
        <version>4.3.11.RELEASE</version>
    </dependency>
    <dependency>
        <groupId>com.alibaba</groupId>
        <artifactId>dubbo</artifactId>
        <version>2.5.7</version>
    </dependency>
    <dependency>
        <groupId>org.apache.zookeeper</groupId>
        <artifactId>zookeeper</artifactId>
        <version>3.4.10</version>
    </dependency>
    <dependency>
        <groupId>com.github.sgroschupf</groupId>
        <artifactId>zkclient</artifactId>
        <version>0.1</version>
    </dependency>
</dependencies>

3.1      编写接口

HelloService同1.1中的一样。

3.2   spring调用服务

spring-config.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">
    <!-- 引用dubbo服务 -->
    <dubbo:application name="dubbo-client-test"/>
    <dubbo:registry protocol="zookeeper" address="10.0.31.98:2181"/>
    <dubbo:reference interface="service.HelloService" id="helloService"/>
</beans>

3.3测试

import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import service.HelloService;

public class ClientTest {
    public static void main(String[] args) {
        ApplicationContext ac = new ClassPathXmlApplicationContext("spring-config.xml");
        HelloService helloService = (HelloService) ac.getBean("helloService");
        System.out.println(helloService.sayHello());
    }
}