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[dubbo] dubbo 基础使用

时间:2016-01-04 13:08:54      阅读:327      评论:0      收藏:0      [点我收藏+]

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Dubbo是一个分布式服务框架,致力于提供高性能和透明化的RPC远程服务调用方案,以及SOA服务治理方案。简单的说,dubbo就是个服务框架,如果没有分布式的需求,其实是不需要用的,只有在分布式的时候,才有dubbo这样的分布式服务框架的需求,并且本质上是个服务调用的东东,说白了就是个远程服务调用的分布式框架(告别Web Service模式中的WSdl,以服务者与消费者的方式在dubbo上注册)。
其核心部分包含:
1. 远程通讯: 提供对多种基于长连接的NIO框架抽象封装,包括多种线程模型,序列化,以及“请求-响应”模式的信息交换方式。
2. 集群容错: 提供基于接口方法的透明远程过程调用,包括多协议支持,以及软负载均衡,失败容错,地址路由,动态配置等集群支持。
3. 自动发现: 基于注册中心目录服务,使服务消费方能动态的查找服务提供方,使地址透明,使服务提供方可以平滑增加或减少机器。

1.透明化的远程方法调用,就像调用本地方法一样调用远程方法,只需简单配置,没有任何API侵入。      
2.软负载均衡及容错机制,可在内网替代F5等硬件负载均衡器,降低成本,减少单点。
3. 服务自动注册与发现,不再需要写死服务提供方地址,注册中心基于接口名查询服务提供者的IP地址,并且能够平滑添加或删除服务提供者。

Dubbo采用全Spring配置方式,透明化接入应用,对应用没有任何API侵入,只需用Spring加载Dubbo的配置即可,Dubbo基于Spring的Schema扩展进行加载。

具体文档可参考阿里官网:http://dubbo.io/Home-zh.htm

另外附上测试demo:

1.新建maven工程:dubbo,作为服务的提供者

 依赖jar:

<properties>

    <jersey.version>2.22.1</jersey.version>
    <spring.version>4.1.6.RELEASE</spring.version>
    <dubbo.version>2.5.3</dubbo.version>
    <zookeeper.version>3.4.6</zookeeper.version>
  </properties>
  <dependencies>
    <dependency>
      <groupId>junit</groupId>
      <artifactId>junit</artifactId>
      <version>4.11</version>
      <scope>test</scope>
    </dependency>

    <dependency>
      <groupId>org.glassfish.jersey.ext</groupId>
      <artifactId>jersey-spring3</artifactId>
      <version>${jersey.version}</version>
    </dependency>
    <dependency>
      <groupId>org.glassfish.jersey.media</groupId>
      <artifactId>jersey-media-json-jackson</artifactId>
      <version>${jersey.version}</version>
    </dependency>

    <dependency>
      <groupId>org.glassfish.jersey.ext</groupId>
      <artifactId>jersey-mvc</artifactId>
      <version>${jersey.version}</version>
    </dependency>

    <dependency>
      <groupId>org.glassfish.jersey.core</groupId>
      <artifactId>jersey-client</artifactId>
      <version>${jersey.version}</version>
    </dependency>
    <!--servlet-->


    <dependency>
      <groupId>javax.servlet</groupId>
      <artifactId>jstl</artifactId>
      <version>1.2</version>
    </dependency>

    <dependency>
      <groupId>org.aspectj</groupId>
      <artifactId>aspectjweaver</artifactId>
      <version>1.8.7</version>
    </dependency>

    <!-- Druid -->
    <dependency>
      <groupId>com.alibaba</groupId>
      <artifactId>druid</artifactId>
      <version>1.0.13</version>
    </dependency>

    <!-- spring -->
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-context-support</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-tx</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-jdbc</artifactId>
      <version>${spring.version}</version>
    </dependency>

    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-web</artifactId>
      <version>${spring.version}</version>
    </dependency>

    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-aspects</artifactId>
      <version>${spring.version}</version>
    </dependency>

    <!-- MySQL Driver -->
    <dependency>
      <groupId>mysql</groupId>
      <artifactId>mysql-connector-java</artifactId>
      <version>5.1.6</version>
    </dependency>

    <!-- MyBatis -->
    <dependency>
      <groupId>org.mybatis</groupId>
      <artifactId>mybatis</artifactId>
      <version>3.3.0</version>
    </dependency>

    <dependency>
      <groupId>org.mybatis</groupId>
      <artifactId>mybatis-spring</artifactId>
      <version>1.2.3</version>
    </dependency>
<!-- Alibaba  -->
         <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>fastjson</artifactId>
            <version>1.2.7</version>
        </dependency>
        
        
        <dependency>
    <groupId>com.alibaba</groupId>
    <artifactId>dubbo</artifactId>
    <version>${dubbo.version}</version>
</dependency>

<dependency>
    <groupId>org.apache.zookeeper</groupId>
    <artifactId>zookeeper</artifactId>
    <version>${zookeeper.version}</version>
</dependency>

<dependency>
    <groupId>com.github.sgroschupf</groupId>
    <artifactId>zkclient</artifactId>
    <version>0.1</version>
</dependency>

 

  web.xml:

<!DOCTYPE web-app PUBLIC
 "-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN"
 "http://java.sun.com/dtd/web-app_2_3.dtd" >

<web-app>
  <display-name>Archetype Created Web Application</display-name>
  
   <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>

    <filter>
        <filter-name>characterEncodingFilter</filter-name>
        <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
        <init-param>
            <param-name>encoding</param-name>
            <param-value>UTF-8</param-value>
        </init-param>
        <init-param>
            <param-name>forceEncoding</param-name>
            <param-value>true</param-value>
        </init-param>
    </filter>
    <filter-mapping>
        <filter-name>characterEncodingFilter</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping>
</web-app>

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:aop="http://www.springframework.org/schema/aop"
    xmlns:dubbo="http://code.alibabatech.com/schema/dubbo"
    xmlns:p="http://www.springframework.org/schema/p"
    xmlns:tx="http://www.springframework.org/schema/tx"
    xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
        http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-4.1.xsd
        http://code.alibabatech.com/schema/dubbo http://code.alibabatech.com/schema/dubbo/dubbo.xsd
        http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-4.1.xsd">
   <!-- 具体的实现bean -->  
   <bean id="helloDaoImpl" class="com.xwolf.dubbo.dao.impl.HelloDaoImpl"></bean>
   
   <dubbo:application name="helloProvider" />
   
   <!-- 使用zookeeper注册中心暴露服务地址 -->  
   <dubbo:registry address="zookeeper://127.0.0.1:2181" />
   
    <!-- 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="com.xwolf.dubbo.dao.HelloDao" ref="helloDaoImpl" />
  
 
</beans>

接口和实现类:

package com.xwolf.dubbo.dao;

public interface HelloDao {
    
    String sayHello(String name);

}
package com.xwolf.dubbo.dao.impl;

import com.xwolf.dubbo.dao.HelloDao;

public class HelloDaoImpl implements HelloDao {

    public String sayHello(String name) {
        return "Hello,"+name+" Dubbo 欢迎你!";
    }

}

将工程部署即可,服务提供者创建完成。

 

2.服务调用

新建java Project ,导入jar。

spring-dubbo-consumer.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:aop="http://www.springframework.org/schema/aop"
    xmlns:dubbo="http://code.alibabatech.com/schema/dubbo"
    xmlns:p="http://www.springframework.org/schema/p"
    xmlns:tx="http://www.springframework.org/schema/tx"
    xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
        http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-4.1.xsd
        http://code.alibabatech.com/schema/dubbo http://code.alibabatech.com/schema/dubbo/dubbo.xsd
        http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-4.1.xsd">
 
 
  <dubbo:application name="helloConsumer" />
   
   <!-- 使用zookeeper注册中心暴露服务地址 -->  
   <dubbo:registry address="zookeeper://123.56.162.170:2181" />
   
   
  <dubbo:reference interface="com.xwolf.dubbo.dao.HelloDao" id="helloDao"/>

</beans>

测试接口:

package com.xwolf.dubbo.dao;



public interface HelloDao {
    
    String sayHello(String name);

}

 

 测试:

package com.xwolf.dubbo.test;

import org.springframework.context.support.ClassPathXmlApplicationContext;

import com.xwolf.dubbo.dao.HelloDao;

public class TestDubbo {
    
    public static void main(String[] args) {
        
        ClassPathXmlApplicationContext context = new ClassPathXmlApplicationContext(  
                new String[] { "spring-dubbo-consumer.xml" });  
        context.start();  
        
       HelloDao helloDao = (HelloDao) context.getBean("helloDao");
       
       System.out.println(helloDao.sayHello("wo cao"));
    }

}

运行:

技术分享

注意问题:

工程中暴露的接口路径和名称一定要完全一致,否则会抛出异常。

 

基于ZooKeeper的Dubbo注册中心

[dubbo] dubbo 基础使用

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原文地址:http://www.cnblogs.com/lonelywolfmoutain/p/5098353.html

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