dubbox小demo

概述：

我们建立两个web项目，一个是service负责提供服务，另一个是web项目负责调用服务。

两个项目都是 maven Project 项目

生产者项目：

项目中主要就是：

pom文件，引入相关的jar包，加载tomcat启动插件

pom.xml

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
  <modelVersion>4.0.0</modelVersion>
  <groupId>com.ithema.demo</groupId>
  <artifactId>dubboxdemo-service</artifactId>
  <version>0.0.1-SNAPSHOT</version>
  <packaging>war</packaging>
  
   <properties>        
        <spring.version>4.2.4.RELEASE</spring.version>
   </properties>
    
    <dependencies>
        <!-- Spring -->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-context</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-webmvc</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-aspects</artifactId>
            <version>${spring.version}</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-jms</artifactId>
            <version>${spring.version}</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-context-support</artifactId>
            <version>${spring.version}</version>
        </dependency>    
    
        <!-- dubbo相关 -->
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>dubbo</artifactId>
            <version>2.8.4</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.maven.plugins</groupId>  
              <artifactId>maven-compiler-plugin</artifactId>  
              <version>2.3.2</version>  
              <configuration>  
                  <source>1.7</source>  
                  <target>1.7</target>  
              </configuration>  
          </plugin>  
          <plugin>
                <groupId>org.apache.tomcat.maven</groupId>
                <artifactId>tomcat7-maven-plugin</artifactId>
                <configuration>
                    <!-- 指定端口 -->
                    <port>8081</port>
                    <!-- 请求路径 -->
                    <path>/</path>
                </configuration>
            </plugin>
      </plugins>  
    </build>
</project>

spring配置文件：因为我们用的是spring集成dubbox，所以需要在配置文件中配置dubbox相关信息

applicationContext-service.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:p="http://www.springframework.org/schema/p"
    xmlns:context="http://www.springframework.org/schema/context"
    xmlns:dubbo="http://code.alibabatech.com/schema/dubbo" xmlns:mvc="http://www.springframework.org/schema/mvc"
    xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
        http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc.xsd
        http://code.alibabatech.com/schema/dubbo http://code.alibabatech.com/schema/dubbo/dubbo.xsd
        http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd">
        
        <!-- 提供服务的名称，可以写生产者项目的工程名 -->
        <dubbo:application name="dubboxdemo-service"/>  
        <!-- zookeeper注册中心的地址和端口 -->
        <dubbo:registry address="zookeeper://192.168.25.128:2181"/>
        <!-- 需要暴露的接口所在的包的全限定名 @service 即 com.alibaba.dubbo.config.annotation.Service 注解所在的包名（好去扫描它）--> 
        <dubbo:annotation package="com.ithema.demo.service" /> 
   
</beans>

注意：这里 <dubbo:annotation package= 配置的是 @Service 注解所在的包的全名，注意是包，而不是类

web.xml中加载spring的配置文件即可：

web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xmlns="http://java.sun.com/xml/ns/javaee"
    xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"
    version="2.5">    
    
    <!-- 加载spring容器 -->
    <context-param>
        <param-name>contextConfigLocation</param-name>
        <param-value>classpath:applicationContext*.xml</param-value>
    </context-param>
    <listener>
        <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
    </listener>
    
</web-app>

然后就是代码，代码很简单，只需要定义一个接口和一个实现类，接口就是要暴露出去的服务接口

接口 UserService

package com.ithema.demo.service;

public interface UserService {
    String getName();
}

接口代码中不用做任何特殊配置，纯java代码。但是要注意，接口所在的包的全名就是配置在 xml 文件中的 <dubbo:annotation package="com.ithema.demo.service" /> 【其实我觉得主要是要在配置文件中配置好实现类所在的包，因为需要根据配置的包来扫描其内部的 dubbox相关的注解以实现dubbox功能】

然后是实现类：

UserServiceImpl

package com.ithema.demo.service.impl;
import com.alibaba.dubbo.config.annotation.Service;
import com.ithema.demo.service.UserService;

@Service
public class UserServiceImpl implements UserService {
    public String getName() {
        return "ithema";
    }
}

实现类中要注意的就是需要加上注解 Service，注意，这个注解不是springMvc中的 service注解，而是 dubbox包中的注解：

import com.alibaba.dubbo.config.annotation.Service;

不要导错包，加上这个注解，才会把这个服务注册到 zookeeper的注册中心中去。

==================

下面开始配置消费者项目

这个项目里的 pom文件和生产者项目是一样的，区别只需要设置不同的tomcat启动插件端口

pom文件：

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
  <modelVersion>4.0.0</modelVersion>
  <groupId>com.itheima.demo</groupId>
  <artifactId>dubboxdemo-web</artifactId>
  <version>0.0.1-SNAPSHOT</version>
  <packaging>war</packaging>
  
   <properties>        
        <spring.version>4.2.4.RELEASE</spring.version>
   </properties>
    
    <dependencies>
        <!-- Spring -->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-context</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-webmvc</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-aspects</artifactId>
            <version>${spring.version}</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-jms</artifactId>
            <version>${spring.version}</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-context-support</artifactId>
            <version>${spring.version}</version>
        </dependency>    
    
        <!-- dubbo相关 -->
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>dubbo</artifactId>
            <version>2.8.4</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.maven.plugins</groupId>  
              <artifactId>maven-compiler-plugin</artifactId>  
              <version>2.3.2</version>  
              <configuration>  
                  <source>1.7</source>  
                  <target>1.7</target>  
              </configuration>  
          </plugin>  
          <plugin>
                <groupId>org.apache.tomcat.maven</groupId>
                <artifactId>tomcat7-maven-plugin</artifactId>
                <configuration>
                    <!-- 指定端口 -->
                    <port>8082</port>
                    <!-- 请求路径 -->
                    <path>/</path>
                </configuration>
            </plugin>
      </plugins>  
    </build>
</project>

然后是 spring配置文件，因为这个是个负责响请求的web项目，所以，将 dubbox 的配置写到 spirngMVC配置文件中即可：

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:p="http://www.springframework.org/schema/p"
    xmlns:context="http://www.springframework.org/schema/context"
    xmlns:dubbo="http://code.alibabatech.com/schema/dubbo" xmlns:mvc="http://www.springframework.org/schema/mvc"
    xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
        http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc.xsd
        http://code.alibabatech.com/schema/dubbo http://code.alibabatech.com/schema/dubbo/dubbo.xsd
        http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd">

    <mvc:annotation-driven >
        <mvc:message-converters register-defaults="false">
            <bean class="org.springframework.http.converter.StringHttpMessageConverter">  
                <constructor-arg value="UTF-8" />
            </bean>  
        </mvc:message-converters>    
    </mvc:annotation-driven>

    <!-- 消费者的名称，可以用消费者项目名 -->
    <dubbo:application name="dubboxdemo-web"/>  
    <!-- zookeeper注册中心地址端口 -->
    <dubbo:registry address="zookeeper://192.168.25.128:2181"/> 
    <!-- @Reference 注解所在的包，根据下面配置的路径去扫描dubbox的相关注解 -->
    <dubbo:annotation package="com.ithema.demo.controller" />

</beans>

在这里，关于 dubbox 配置的写法标签都是一样的，但是这个扫描包要配置成 Controller所在的包，因为要扫描 Controller类中注入接口上的 @Reference 注解

注意：这里 <dubbo:annotation package= 配置的是 @Reference 注解所在的包的全名，注意是包，而不是类。

代码：

首先是 service，这个service其实就是把生产者项目中的那个接口UserService 连同其所在包原封不动的拿过来的，就是为了符合 spring的注入要求。

Controller代码：

package com.ithema.demo.controller;

import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;

import com.alibaba.dubbo.config.annotation.Reference;
import com.ithema.demo.service.UserService;

@Controller
@RequestMapping("/user")
public class UserController {
    
    @Reference
    private UserService userService;
    
    @RequestMapping("/showName")
    @ResponseBody
    public String showName(){
        String name = userService.getName();
        return name;
    }
}

主要是要在 service上加入 @Reference 注解，说明这个是调用远程的接口注入。

消费者的 web.xml ：

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xmlns="http://java.sun.com/xml/ns/javaee"
    xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"
    version="2.5">
    
    <welcome-file-list>
        <welcome-file>index.jsp</welcome-file>
    </welcome-file-list>    
   <!-- 解决post乱码 -->
    <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>    
    
  <servlet>
      <servlet-name>springmvc</servlet-name>
      <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
      <!-- 指定加载的配置文件 ，通过参数contextConfigLocation加载-->
      <init-param>
          <param-name>contextConfigLocation</param-name>
          <param-value>classpath:springmvc.xml</param-value>
      </init-param>
  </servlet>
  
  <servlet-mapping>
      <servlet-name>springmvc</servlet-name>
      <url-pattern>*.do</url-pattern>
  </servlet-mapping>

</web-app>

=======

测试：

先启动service项目，然后再启动 web项目，然后在浏览器中访问：

说明远程接口调用实现了。

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