17.玩转Spring Boot 集成Dubbo

玩转Spring Boot 集成Dubbo

      使用Spring Boot 与Dubbo集成，这里我之前尝试了使用注解的方式，简单的使用注解注册服务其实是没有问题的，但是当你涉及到使用注解的时候在服务里面引用事务，注入其他对象的时候，会有一些问题。于是我就果断放弃了注解了，使用的是XML，这里可能介绍的是Dubbo，但是如果使用Dubbox的话，基本上是兼容的。接下来，将说说使用XML的方式与Spring Boot在一起开发。

1.创建工程在pom.xml中加入依赖

      创建工程名为：

      （1）springboot-dubbo-provide

      （2）springboot-dubbo-api

      （3）springboot-dubbo-consume

        springboot-dubbo-api工程主要是放一些service接口，用于提供给消费者使用 。springboot-dubbo-provide工程用于提供服务。  springboot-dubbo-consume工程为消费者。在springboot-dubbo-provide工程中打开pom.xml加入以下依赖，完整代码如下：

<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.chengli</groupId><artifactId>springboot-dubbo-provide</artifactId><version>0.0.1-SNAPSHOT</version><packaging>jar</packaging><name>springboot-dubbo-provide</name><url>http://maven.apache.org</url><parent><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-parent</artifactId><version>1.4.3.RELEASE</version></parent><properties><project.build.sourceEncoding>UTF-8</project.build.sourceEncoding><java.version>1.8</java.version><com.alibaba.dubbo.version>2.5.3</com.alibaba.dubbo.version><org.apache.zookeeper.version>3.4.6</org.apache.zookeeper.version><com.github.sgroschupf.zkclient.version>0.1</com.github.sgroschupf.zkclient.version></properties><dependencies><dependency><groupId>com.chengli</groupId><artifactId>springboot-dubbo-api</artifactId><version>0.0.1-SNAPSHOT</version></dependency><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter</artifactId></dependency><!-- dubbo --><dependency><groupId>com.alibaba</groupId><artifactId>dubbo</artifactId><exclusions><exclusion><groupId>org.springframework</groupId><artifactId>spring</artifactId></exclusion></exclusions><version>${com.alibaba.dubbo.version}</version></dependency><dependency><groupId>org.apache.zookeeper</groupId><artifactId>zookeeper</artifactId><version>${org.apache.zookeeper.version}</version></dependency><dependency><groupId>com.github.sgroschupf</groupId><artifactId>zkclient</artifactId><version>${com.github.sgroschupf.zkclient.version}</version></dependency></dependencies><build><plugins><plugin><groupId>org.springframework.boot</groupId><artifactId>spring-boot-maven-plugin</artifactId></plugin></plugins></build></project>

打开springboot-dubbo-consume工程，在pom.xml中加入以下依赖，完整代码如下：

<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.chengli</groupId><artifactId>springboot-dubbo-consume</artifactId><version>0.0.1-SNAPSHOT</version><packaging>jar</packaging><name>springboot-dubbo-consume</name><url>http://maven.apache.org</url><parent><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-parent</artifactId><version>1.4.3.RELEASE</version></parent><properties><project.build.sourceEncoding>UTF-8</project.build.sourceEncoding><java.version>1.8</java.version><com.alibaba.dubbo.version>2.5.3</com.alibaba.dubbo.version><org.apache.zookeeper.version>3.4.6</org.apache.zookeeper.version><com.github.sgroschupf.zkclient.version>0.1</com.github.sgroschupf.zkclient.version></properties><dependencies><dependency><groupId>com.chengli</groupId><artifactId>springboot-dubbo-api</artifactId><version>0.0.1-SNAPSHOT</version></dependency><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-web</artifactId></dependency><!-- dubbo --><dependency><groupId>com.alibaba</groupId><artifactId>dubbo</artifactId><exclusions><exclusion><groupId>org.springframework</groupId><artifactId>spring</artifactId></exclusion></exclusions><version>${com.alibaba.dubbo.version}</version></dependency><dependency><groupId>org.apache.zookeeper</groupId><artifactId>zookeeper</artifactId><version>${org.apache.zookeeper.version}</version></dependency><dependency><groupId>com.github.sgroschupf</groupId><artifactId>zkclient</artifactId><version>${com.github.sgroschupf.zkclient.version}</version></dependency><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-configuration-processor</artifactId><optional>true</optional></dependency></dependencies><build><plugins><plugin><groupId>org.springframework.boot</groupId><artifactId>spring-boot-maven-plugin</artifactId></plugin></plugins></build></project>

2.Dubbo配置

2.1springboot-dubbo-provide服务提供者

      （1）在springboot-dubbo-provide项目中创建入口启动类MainConfig，完整代码如下：

package com.chengli.springboot;import org.springframework.boot.SpringApplication;import org.springframework.boot.autoconfigure.SpringBootApplication;@SpringBootApplicationpublic class MainConfig {public static void main(String[] args) {SpringApplication.run(MainConfig.class, args);try {System.in.read();} catch (Exception e) {e.printStackTrace();}}}

      （2）创建Dubbo配置类

package com.chengli.springboot.dubbo;import org.springframework.context.annotation.Configuration;import org.springframework.context.annotation.ImportResource;import org.springframework.context.annotation.PropertySource;@Configuration@PropertySource("classpath:dubbo/dubbo.properties")@ImportResource({ "classpath:dubbo/*.xml" })public class DubboConfig {}

     （3）创建Dubbo配置文件

在src/main/resources下新建文件夹dubbo，并加入以下配置：

dubbo-provider.xml内容如下：

<?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/beanshttp://www.springframework.org/schema/beans/spring-beans.xsdhttp://code.alibabatech.com/schema/dubbohttp://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="${dubbo.application.name}" /><!-- 注册中心暴露服务地址 --><!-- <dubbo:registry address="multicast://224.5.6.7:1234" /> -->   <!-- <dubbo:registry protocol="zookeeper" address="10.170.219.98:2181,10.173.55.173:2181" /> -->   <dubbo:registry protocol="${dubbo.registry.protocol}" address="${dubbo.registry.address}" /><!-- 暴露服务 --><dubbo:protocol name="${dubbo.protocol.name}" port="${dubbo.protocol.port}" /><dubbo:service interface="com.chengli.springboot.example.service.ExampleService"ref="exampleServiceImpl" retries="0" timeout="6000" /></beans>

    注意：这里我发布的example服务是示例，具体的根据实际修改

    （4）创建dubbo.properties

#应用名称dubbo.application.name=example-provider#注册中心类型dubbo.registry.protocol=zookeeper#注册中心地址dubbo.registry.address=127.0.0.1:2181#暴露服务方式dubbo.protocol.name=dubbo#暴露服务端口dubbo.protocol.port=20880

2.2springboot-dubbo-consume服务消费者

    （1）创建入口启动类MainConfig

package com.chengli.springboot;import org.springframework.boot.SpringApplication;import org.springframework.boot.autoconfigure.SpringBootApplication;@SpringBootApplicationpublic class MainConfig {public static void main(String[] args) {SpringApplication.run(MainConfig.class, args);}}

    （2）创建Dubbo配置类

package com.chengli.springboot.dubbo;import org.springframework.context.annotation.Configuration;import org.springframework.context.annotation.ImportResource;import org.springframework.context.annotation.PropertySource;@Configuration@PropertySource("classpath:dubbo/dubbo.properties")@ImportResource({ "classpath:dubbo/*.xml" })public class DubboConfig {}

    （3）创建Dubbo配置文件

在src/main/resources下新建文件夹dubbo，并加入以下配置：

dubbo-consume.xml内容如下：

<?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/beanshttp://www.springframework.org/schema/beans/spring-beans.xsdhttp://code.alibabatech.com/schema/dubbohttp://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="${dubbo.application.name}" /><!-- 注册中心暴露服务地址 -->   <dubbo:registry protocol="${dubbo.registry.protocol}" address="${dubbo.registry.address}" /><dubbo:reference id="axempleService" interface="com.chengli.springboot.example.service.ExampleService" /></beans>

    

    （4）创建dubbo.properties

#应用名称dubbo.application.name=example-consume#注册中心类型dubbo.registry.protocol=zookeeper#注册中心地址dubbo.registry.address=127.0.0.1:2181

到这里基本上就已经可以了，不过测试类的代码我就不贴上来了。只要在API中定义接口实现即可。使用Spring Boot 与Dubbo集成的时候，需要注意的是，不要使用Spring Boot提供的devtools热启动，因为devtools提供了两个ClassLoader，加载策略问题导致出现错误，无法启动。如果开发中需要热加载，那么使用Spring 提供的springloaded。

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