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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