Java简单操作dubbo（一）

dubbo-service公共Service

package com.itman.service;
 
public interface UserService {
 
    // 提供服务 使用userId查找用户信息FS
    public String getUserId(Integer id);
}

dubbo-producer生产者

引入依赖

    <dependencies>
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>dubbo</artifactId>
            <version>2.5.6</version>
        </dependency>
        <!-- 添加zk客户端依赖 -->
        <dependency>
            <groupId>com.github.sgroschupf</groupId>
            <artifactId>zkclient</artifactId>
            <version>0.1</version>
        </dependency>
        <dependency>
            <groupId>com.itman</groupId>
            <artifactId>dubbo-service</artifactId>
            <version>0.0.1-SNAPSHOT</version>
        </dependency>
    </dependencies>

实现Service

package com.itman.service.impl;
 
import com.itman.service.UserService;
 
public class UserServiceImpl implements UserService {
 
    public String getUserId(Integer id) {
        System.out.println("被客户端(消费者)消费....id:" + id);
        if (id == 1) {
            return "itman";
        }
        if (id == 2) {
            return "itman2";
        }
        if (id == 1) {
            return "itman3";
        }
        return "未找到...";
 
    }
 
}

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 ">
 
    <!-- 提供方应用信息，用于计算依赖关系 -->
    <dubbo:application name="provider" />
    <!-- 使用zookeeper注册中心暴露服务地址 -->
    <dubbo:registry address="zookeeper://169.254.197.135:2181" />
    <!-- 用dubbo协议在29014端口暴露服务 -->
    <dubbo:protocol name="dubbo" port="29014" />
    <!-- 声明需要暴露的服务接口 -->
    <dubbo:service interface="com.itman.service.UserService" ref="userService" />
    <!-- 具体的实现bean -->
    <bean id="userService" class="com.itman.service.impl.UserServiceImpl" />
</beans>

启动代码

package com.itman;
 
import java.io.IOException;
 
import org.springframework.context.support.ClassPathXmlApplicationContext;
 
public class TestMember {
 
    public static void main(String[] args) throws IOException {
        // 发布服务
        ClassPathXmlApplicationContext app = new ClassPathXmlApplicationContext("provider.xml");
        app.start();// 加载
        System.out.println("服务发布成功...");
        System.in.read(); // 让程序阻塞
    }
}

dubbo-consumer消费者

消费类

package com.itman;
 
import org.springframework.context.support.ClassPathXmlApplicationContext;
 
import com.itman.service.UserService;
 
public class TestConsumer {
 
    public static void main(String[] args) {
        ClassPathXmlApplicationContext app = new ClassPathXmlApplicationContext("consumer.xml");
        UserService userService = (UserService) app.getBean("userService");
        String name = userService.getUserId(1);
        System.out.println("name:" + name);
 
    }
}

消费者配置

<?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">
    <!-- 消费方应用名，用于计算依赖关系，不是匹配条件，不要与提供方一样 -->
    <dubbo:application name="consumer" />
    <!-- 使用multicast广播注册中心暴露发现服务地址 -->
    <dubbo:registry protocol="zookeeper" address="zookeeper://169.254.197.135:2181" />
    <!-- 生成远程服务代理，可以和本地bean一样使用demoService -->
    <dubbo:reference id="userService" interface="com.itman.service.UserService" />
</beans>

Dubbo-admin管理平台搭建

1.将dubbo-admin.zip 解压到webapps目录下

2.修改dubbo.properties zk注册中心连接地址连接信息

3.启动tomcat即可

Dubbo集群、负载均衡、容错

修改：provider.xml  端口号  <dubbo:protocol name="dubbo" port="29015" />

启动两个服务，配置相关权重，负载均衡策略