Dubbo : 传统工程改造(二)

目录

传统工程为什么改造

引用官方文档的说明:

改造思路

对于一个MVC开发模式的项目,我们需要将CV层放在一个项目中,而M单独放在一个项目中.中间接口约定需要一个单独的项目打成jar包形式分别引入.

一个简单的例子(省略了DB相关操作):

UserService.java

public interface UserService {
    public String getUser(String username);
}

UserServiceImpl.java

@Service("userFacede")
public class UserServiceImpl implements UserService{

    Logger log = Logger.getLogger(UserServiceImpl.class);

    public String getUser(String username) {
        log.info("UserService Be Visited");
        if (username.equals("milo")){
            return "hello milo";
        }else{
            return "hello guest";
        }
    }
}

UserController.java

@Controller
public class UserController {

    Logger log = Logger.getLogger(UserController.class);

    @Autowired
    private UserService userService;

    @RequestMapping("/user")
    public String User(String username, HttpServletRequest request, HttpServletResponse response){
        log.info("userController Be Visited");
        request.setAttribute("username",userService.getUser(username));
        return "user";
    }
}

要改成Dubbo项目,我们需要将业务逻辑层与控制层+试图层分离,所以我们将项目改成如下样子:

• dubbodemo-parent : 父项目,定义jar包版本号,聚合所有maven项目(module)等.
• dubbodemo-facede : 定义接口,这个项目是要打成jar包分别被dubbodemo-service和dubbodemo-web引用的
• dubbodemo-service : 只做逻辑实现,也就是dubbo中的生产者

• dubbodemo-web : 负责页面跳转及渲染,也就是dubbo中的消费者

  分别展开讲下这几个项目:
  dubbodemo-facede : 这个项目是不需要引入spring框架的.定义好接口,pom.xml中jar的打包方式就可以了.
  dubbodemo-service : 需要引入 dubbodemo-facede项目(module),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">
    <parent>
        <artifactId>dubbodemo-parent</artifactId>
        <groupId>cn.milo.dubbodemo</groupId>
        <version>1.0-SNAPSHOT</version>
    </parent>
    <modelVersion>4.0.0</modelVersion>

    <artifactId>dubbodemo-service</artifactId>
    <packaging>war</packaging>

    <name>dubbodemo-service</name>
    <url>http://maven.apache.org</url>

    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    </properties>

    <dependencies>
        <dependency>
            <groupId>cn.milo.dubbodemo</groupId>
            <artifactId>dubbodemo-facede</artifactId>
            <version>${dubbodemo-facede.version}</version>
        </dependency>
        <!-- dubbo -->
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>dubbo</artifactId>
        </dependency>
        <!-- Zookeeper-->
        <dependency>
            <groupId>com.github.sgroschupf</groupId>
            <artifactId>zkclient</artifactId>
        </dependency>
        <!-- log4j -->
        <dependency>
            <groupId>log4j</groupId>
            <artifactId>log4j</artifactId>
        </dependency>
        <!-- Spring Begin -->
              .
              .
              .
        <!-- Spring End -->
    </dependencies>
</project>

dubbo-provider.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">

    <!-- 提供方应用信息，用于计算依赖关系 -->
    <dubbo:application name="gw-service-user" />

    <!-- 使用zookeeper注册中心暴露服务地址 -->
    <dubbo:registry protocol="zookeeper" address="47.94.81.**:2181" />

    <!-- 用dubbo协议在20880端口暴露服务 -->
    <dubbo:protocol name="dubbo" port="20880" />

    <!-- 用户服务接口 -->
    <dubbo:service interface="cn.milo.dubboservice.UserService" ref="userFacede" />

</beans>  

dubbodemo-web: 同样需要引入 dubbodemo-facede项目(module),pom.xml和dubbodemo-service一样

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: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="edu-web-boss" />

    <!-- 使用zookeeper注册中心暴露服务地址 -->
    <!-- 注册中心地址 -->
    <dubbo:registry protocol="zookeeper" address="47.94.81.162:2181" />

    <!-- 用户服务接口 这里的id可以随便写哈 -->
    <dubbo:reference interface="cn.milo.dubboservice.UserService" id="admin" check="false" />


</beans>  

项目源码

http://download.csdn.net/download/shangmingtao/9983768