1. 尽量用XML 集成，这也的Dubbo官方推荐的集成方式

自己在使用注解集成过程中发现有坑：Springmvc包扫描和dubbo包扫描冲突，导致消费端一直拿不到代理对象（null），非常蛋疼，所以猜测可能还有其他坑

搭建环境主要是几个pom文件非常重要

项目结构：

dubbo-demo

	|- common

				|- pom.xml

  |- consumer

  			|- pom.xml

  |- provider

  			|- pom.xml

  |- pom.xml

dubbo-demo 的pom.xml

<?xml version="1.0" encoding="UTF-8"?>

<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.grady</groupId>

  <artifactId>dubbo-demo</artifactId>

  <packaging>pom</packaging>

  <version>1.0-SNAPSHOT</version>

  <modules>

    <module>consumer</module>

    <module>provider</module>

    <module>common</module>

  </modules>

  <parent>

    <groupId>org.springframework.boot</groupId>

    <artifactId>spring-boot-starter-parent</artifactId>

    <version>2.1.3.RELEASE</version>

  </parent>

  <properties>

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

    <java.version>1.8</java.version>

    <dubbo.version>2.5.5</dubbo.version>

    <zkclient.version>0.10</zkclient.version>

    <lombok.version>1.18.2</lombok.version>

    <spring-boot.version>2.1.3.RELEASE</spring-boot.version>

    <spring-boot-starter-dubbo.version>1.0.0</spring-boot-starter-dubbo.version>

    <slf4j.version>1.7.25</slf4j.version>

    <curator.version>1.1.10</curator.version>

  </properties>

  <dependencyManagement>

    <dependencies>

      <!-- Springboot依赖 -->

      <dependency>

        <groupId>org.springframework.boot</groupId>

        <artifactId>spring-boot-starter</artifactId>

        <version>${spring-boot.version}</version>

      </dependency>

      <dependency>

        <groupId>org.projectlombok</groupId>

        <artifactId>lombok</artifactId>

        <version>${lombok.version}</version>

        <scope>provided</scope>

      </dependency>

      <!-- Dubbo依赖 -->

      <dependency>

        <groupId>com.alibaba</groupId>

        <artifactId>dubbo</artifactId>

        <version>${dubbo.version}</version>

        <exclusions>

          <exclusion>

            <groupId>log4j</groupId>

            <artifactId>log4j</artifactId>

          </exclusion>

        </exclusions>

      </dependency>

      <!--zookeeper的客户端依赖-->

      <dependency>

        <groupId>com.101tec</groupId>

        <artifactId>zkclient</artifactId>

        <version>${zkclient.version}</version>

      </dependency>

    </dependencies>

  </dependencyManagement>

  <build>

    <plugins>

      <plugin>

        <groupId>org.apache.maven.plugins</groupId>

        <artifactId>maven-compiler-plugin</artifactId>

        <configuration>

          <source>${java.version}</source>

          <target>${java.version}</target>

          <encoding>UTF-8</encoding>

        </configuration>

      </plugin>

      <plugin>

        <groupId>org.apache.maven.plugins</groupId>

        <artifactId>maven-resources-plugin</artifactId>

        <configuration>

          <encoding>UTF-8</encoding>

        </configuration>

      </plugin>

    </plugins>

  </build>

</project>

主要是作为父pom用

然后的common

pom.xml

<?xml version="1.0" encoding="UTF-8"?>

<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>dubbo-demo</artifactId>

    <groupId>com.grady</groupId>

    <version>1.0-SNAPSHOT</version>

  </parent>

  <modelVersion>4.0.0</modelVersion>

  <artifactId>common</artifactId>

  <dependencies>

    <dependency>

      <groupId>org.springframework.boot</groupId>

      <artifactId>spring-boot-starter</artifactId>

    </dependency>

    <dependency>

      <groupId>org.springframework.boot</groupId>

      <artifactId>spring-boot-starter-test</artifactId>

      <scope>test</scope>

    </dependency>

    <dependency>

      <groupId>org.projectlombok</groupId>

      <artifactId>lombok</artifactId>

      <scope>provided</scope>

    </dependency>

  </dependencies>

  <build>

    <plugins>

      <plugin>

        <groupId>org.springframework.boot</groupId>

        <artifactId>spring-boot-maven-plugin</artifactId>

      </plugin>

    </plugins>

  </build>

</project>

common 主要是作为公共的jar来引用

再是provider

pom.xml

<?xml version="1.0" encoding="UTF-8"?>

<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>dubbo-demo</artifactId>

    <groupId>com.grady</groupId>

    <version>1.0-SNAPSHOT</version>

  </parent>

  <modelVersion>4.0.0</modelVersion>

  <artifactId>provider</artifactId>

  <dependencies>

    <dependency>

      <groupId>com.grady</groupId>

      <artifactId>common</artifactId>

      <version>1.0-SNAPSHOT</version>

    </dependency>

    <dependency>

      <groupId>org.springframework.boot</groupId>

      <artifactId>spring-boot-starter</artifactId>

    </dependency>

    <dependency>

      <groupId>org.springframework.boot</groupId>

      <artifactId>spring-boot-starter-test</artifactId>

      <scope>test</scope>

    </dependency>

    <dependency>

      <groupId>com.alibaba</groupId>

      <artifactId>dubbo</artifactId>

      <exclusions>

        <exclusion>

          <groupId>log4j</groupId>

          <artifactId>log4j</artifactId>

        </exclusion>

      </exclusions>

    </dependency>

    <!--zookeeper的客户端依赖-->

    <dependency>

      <groupId>com.101tec</groupId>

      <artifactId>zkclient</artifactId>

      <version>${zkclient.version}</version>

    </dependency>

  </dependencies>

  <build>

    <plugins>

      <plugin>

        <groupId>org.springframework.boot</groupId>

        <artifactId>spring-boot-maven-plugin</artifactId>

      </plugin>

    </plugins>

  </build>

</project>

关键是provider的resource目录下的内容

Spring-dubbo-provider.xml

使用@ImportResource({"classpath:spring-dubbo-provider.xml"})进行配置文件加载

<?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">

  <dubbo:application name="provider-demo"/>

  <!-- 注册中心的ip地址 -->

  <dubbo:registry address="zookeeper://127.0.0.1:2181"/>

  <!-- 扫描注解包路径，多个包用逗号分隔，不填pacakge表示扫描当前ApplicationContext中所有的类 -->

  <dubbo:annotation package="com.grady.service.impl"/>

  <!-- use dubbo protocol to export service on port 20880 -->

  <dubbo:protocol name="dubbo" port="20880"/>

  <bean id="userService" class="com.grady.service.impl.UserServiceImpl"/>

  <dubbo:service interface="com.grady.service.UserService" ref="userService"/>

</beans>

再看consumer的pom.xml

<?xml version="1.0" encoding="UTF-8"?>

<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>dubbo-demo</artifactId>

   <groupId>com.grady</groupId>

   <version>1.0-SNAPSHOT</version>

 </parent>

 <modelVersion>4.0.0</modelVersion>

 <artifactId>consumer</artifactId>

 <dependencies>

   <dependency>

     <groupId>com.grady</groupId>

     <artifactId>common</artifactId>

     <version>1.0-SNAPSHOT</version>

   </dependency>

   <dependency>

     <groupId>org.springframework.boot</groupId>

     <artifactId>spring-boot-starter</artifactId>

   </dependency>

   <dependency>

     <groupId>org.springframework.boot</groupId>

     <artifactId>spring-boot-starter-web</artifactId>

   </dependency>

   <dependency>

     <groupId>com.alibaba</groupId>

     <artifactId>dubbo</artifactId>

     <exclusions>

       <exclusion>

         <groupId>log4j</groupId>

         <artifactId>log4j</artifactId>

       </exclusion>

     </exclusions>

   </dependency>

   <!--zookeeper的客户端依赖-->

   <dependency>

     <groupId>com.101tec</groupId>

     <artifactId>zkclient</artifactId>

     <version>${zkclient.version}</version>

   </dependency>

 </dependencies>

 <build>

   <plugins>

     <plugin>

       <groupId>org.springframework.boot</groupId>

       <artifactId>spring-boot-maven-plugin</artifactId>

     </plugin>

   </plugins>

 </build>

</project>

consumer 的resource目录下的内容

spring-dubbo-consumer.xml

使用@ImportResource({"classpath:spring-dubbo-consumer.xml"})进行加载

<?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">

  <dubbo:application name="consumer-demo"/>

  <dubbo:registry address="zookeeper://127.0.0.1:2181"/>

  <dubbo:protocol name="dubbo" port="20880"/>

  <!-- 扫描注解包路径，多个包用逗号分隔，不填pacakge表示扫描当前ApplicationContext中所有的类 -->

  <dubbo:annotation package="com.grady.controller"/>

  <dubbo:reference id="userService" check="false" interface="com.grady.service.UserService"/>

</beans>

---

将consumer 和provider 启动后，查看Zookeeper里的内容

先只启动provider

[zk: localhost:2181(CONNECTED) 18] ls /dubbo/com.grady.service.UserService/consumers

[]

可以看到consumers没有内容

[zk: localhost:2181(CONNECTED) 19] ls /dubbo/com.grady.service.UserService/providers

[dubbo%3A%2F%2F100.118.67.11%3A20880%2Fcom.grady.service.UserService%3Fanyhost%3Dtrue%26application%3Dprovider-demo%26dubbo%3D2.5.5%26generic%3Dfalse%26interface%3Dcom.grady.service.UserService%26methods%3DfindUser%26pid%3D51651%26side%3Dprovider%26timestamp%3D1566208057732]

可以看到providers中有提供者的信息（比如ip，提供的借口等）

再启动consumer

zk: localhost:2181(CONNECTED) 20] ls /dubbo/com.grady.service.UserService/consumers

[consumer%3A%2F%2F100.118.67.11%2Fcom.grady.service.UserService%3Fapplication%3Dconsumer-demo%26category%3Dconsumers%26check%3Dfalse%26dubbo%3D2.5.5%26interface%3Dcom.grady.service.UserService%26methods%3DfindUser%26pid%3D51946%26side%3Dconsumer%26timestamp%3D1566208217754]

consumer启动成功后可以看到Zookeeper中有对应consumer的内容

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