dubbo+zookeeper的简易实现

分布式项目首先想到的问题是如何再多个服务之间进行数据传递和接口调用

1、创建两个服务，一个controller，一个service

service层的实现类使用的service注解，是alibaba的，不是jdk的

//service层的一个类
package com.ghh.service;
import com.alibaba.dubbo.config.annotation.Service;

@Service   
public class TestServiceImpl implements TestService {
    @Override
    public String getName() {
        return "张三";
    }
}
//接口

public interface TestService {
    public String getName();
}

//service服务的applicationContext.xml配置文件
<?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">

    <dubbo:application name="dubbodemo-service"/>
    <!--配置连接的端口号-->
    <dubbo:registry address="zookeeper://192.168.200.128:2181"/>   //虚拟机上的zookeeper的地址
 <!--  扫描带有service的注解，注册到zeekooper的注册中心-->
    <dubbo:annotation package="com.ghh" />
</beans>


//service服务的web.xml文件

<?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>

2、controller服务的

 @Reference  //使用的是alibaba的注解，不是jdk的

@RestController
@RequestMapping("/test")
public class TestController {
    @Reference  
    private TestService testService;
    @RequestMapping("/getName")
    public String getName(){
        System.out.println("123");
        String name = testService.getName();
        return name;
    }

    @RequestMapping("/me")
    public String name(){
        return "张三";
    }
}

此处，我没有导入service服务的jar包，我直接将service服务的接口导到controller服务中，直接调用

 controller服务的applicationContext-web.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">
    <!-- 注解驱动 -->
    <mvc:annotation-driven >
        <!-- 将传输的字符串强制转换成utf-8编码, 防止中文乱码 -->
        <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>
    <!-- 给当前项目服务起个名-->
    <dubbo:application name="dubboxdemo-web" />
    <!-- 配置连接zookepper -->
    <dubbo:registry address="zookeeper://192.168.200.128:2181"/>
    <!-- 配置包扫描, 只有在这个包下面才可以注入service -->
    <dubbo:annotation package="com.ghh" />
</beans>

//controller服务的web.xml文件


<?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">
  <!-- 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>
  <!-- 配置springMvc前端控制器 -->
  <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:applicationContext-web.xml</param-value>
    </init-param>
  </servlet>
  <servlet-mapping>
    <servlet-name>springmvc</servlet-name>
    <url-pattern>/</url-pattern>
  </servlet-mapping>
</web-app>

3、总结

　　dubbo+zookeeper的实现，是将各服务注册到zookeeper，controller通过@Reference注解，从zookeeper中拿到service的代理类对象，service中通过alibaba的@service注解注册到zookeeper中

实现了两个服务之间的跨服调用，接口调用。