Spring Boot 集成Dubbo

1.創建工程在pom.xml中加入依賴

      創建工程名爲：

      （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，用於提供給消費者使用 。springboot-dubbo-provide工程用於提供服務。  springboot-dubbo-consume工程爲消費者。在springboot-dubbo-provide工程中打開pom.xml加入以下依賴，完整代碼如下：

<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>

打開springboot-dubbo-consume工程，在pom.xml中加入以下依賴，完整代碼如下：

<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服務提供者

      （1）在springboot-dubbo-provide項目中創建入口啓動類MainConfig，完整代碼如下：

package com.chengli.springboot;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
public class MainConfig {
    public static void main(String[] args) {
        SpringApplication.run(MainConfig.class, args);
        try {
            System.in.read();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

      （2）創建Dubbo配置類

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）創建Dubbo配置文件

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

dubbo-provider.xml內容如下：

<?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/beans
    http://www.springframework.org/schema/beans/spring-beans.xsd
    http://code.alibabatech.com/schema/dubbo
    http://code.alibabatech.com/schema/dubbo/dubbo.xsd">

    <!-- 提供方應用信息，用於計算依賴關係 -->
    <dubbo:application name="${dubbo.application.name}" />

    <!-- 註冊中心暴露服務地址 -->
    <!-- <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}" />

    <!-- 暴露服務 -->
    <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：這裏我發佈的example服務是示例，具體的根據實際修改

    （4）創建dubbo.properties

#應用名稱
dubbo.application.name=example-provider
#註冊中心類型
dubbo.registry.protocol=zookeeper
#註冊中心地址
dubbo.registry.address=127.0.0.1:2181
#暴露服務方式
dubbo.protocol.name=dubbo
#暴露服務端口
dubbo.protocol.port=20880

2.2springboot-dubbo-consume服務消費者

    （1）創建入口啓動類MainConfig

package com.chengli.springboot;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
public class MainConfig {
    public static void main(String[] args) {
        SpringApplication.run(MainConfig.class, args);
    }
}

    （2）創建Dubbo配置類

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）創建Dubbo配置文件

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

dubbo-consume.xml內容如下：

<?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/beans
    http://www.springframework.org/schema/beans/spring-beans.xsd
    http://code.alibabatech.com/schema/dubbo
    http://code.alibabatech.com/schema/dubbo/dubbo.xsd">

    <!-- 提供方應用信息，用於計算依賴關係 -->
    <dubbo:application name="${dubbo.application.name}" />

    <!-- 註冊中心暴露服務地址 -->
   <dubbo:registry protocol="${dubbo.registry.protocol}" address="${dubbo.registry.address}" />

    <dubbo:reference id="axempleService" interface="com.chengli.springboot.example.service.ExampleService" />
</beans>

    

    （4）創建dubbo.properties

#應用名稱
dubbo.application.name=example-consume
#註冊中心類型
dubbo.registry.protocol=zookeeper
#註冊中心地址
dubbo.registry.address=127.0.0.1:2181

到這裏基本上就已經可以了，不過測試類的代碼我就不貼上來了。只要在API中定義接口實現即可。使用Spring Boot 與Dubbo集成的時候，需要注意的是，不要使用Spring Boot提供的devtools熱啓動，因爲devtools提供了兩個ClassLoader，加載策略問題導致出現錯誤，無法啓動。如果開發中需要熱加載，那麼使用Spring 提供的springloaded。