springboot2.0+dubbo整合分布式服务发布和调用

最近项目上要对以前的老项目做分布式的整改，因此我专门花了点时间研究下当前比较热门的dubbo和springboot结合使用，以前使用过dubbo，但是没有与springboot结合过，在网上查了点资料，感觉要么是springboot版本过低，要么是dubbo版本过低，反正基本是千篇一律，查考价值不大。下面我们就直入主题，看下springboot+dubbo的简单使用：

首先是新建三个项目：dubbo-common：  主要存放服务发布的接口以及发布和调用端的公共对象，dubbo-provider：   服务提供方                    dubbo-consumer：  服务消费方。新建项目就不说了，直接上maven依赖，其中dubbo-provier和dubbo-consumer的依赖基本一样

<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>org.dubbo</groupId>
  <artifactId>dubbo-provider</artifactId>
  <version>0.0.1-SNAPSHOT</version>
  <!-- 引入springboot -->
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.0.4.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>

  <dependencies>

      <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter</artifactId>
    </dependency>

      <dependency>
        <groupId>com.alibaba</groupId>
        <artifactId>dubbo</artifactId>
        <version>2.6.2</version>
        <exclusions>
             <exclusion>
                 <artifactId>spring</artifactId>
                 <groupId>org.springframework</groupId>
             </exclusion>
         </exclusions>
    </dependency>

    <dependency>
        <groupId>com.alibaba.boot</groupId>
        <artifactId>dubbo-spring-boot-starter</artifactId>
        <version>0.2.0</version>
    </dependency>

    <dependency>
        <groupId>org.javassist</groupId>
        <artifactId>javassist</artifactId>
        <version>3.20.0-GA</version>
    </dependency>

    <dependency>
        <groupId>org.jboss.netty</groupId>
        <artifactId>netty</artifactId>
        <version>3.2.5.Final</version>
    </dependency>

    <dependency>
        <groupId>org.apache.zookeeper</groupId>
        <artifactId>zookeeper</artifactId>
        <version>3.4.10</version>
        <exclusions>
            <exclusion>
                <artifactId>slf4j-log4j12</artifactId>
                <groupId>org.slf4j</groupId>
            </exclusion>
        </exclusions>
    </dependency>

    <dependency>
        <groupId>com.github.sgroschupf</groupId>
        <artifactId>zkclient</artifactId>
        <version>0.1</version>
    </dependency>
  </dependencies>

  <build>
      <plugins>
          <plugin>
            <groupId>org.apache.maven.plugins</groupId>
            <artifactId>maven-compiler-plugin</artifactId>
            <configuration>
                <source>1.8</source>
                <target>1.8</target>
            </configuration>
          </plugin>

          <!-- Spingboot的插件 -->
          <plugin>
              <groupId>org.springframework.boot</groupId>
             <artifactId>spring-boot-maven-plugin</artifactId>
          </plugin>
      </plugins>
  </build>

</project>

大家从pom文件中可以看到，我的项目使用的是springboot的2.0.4版本，dubbo使用的是2.6.2，重点是dubbo和springboot的结合包使用的是如下依赖：

<dependency>
    <groupId>com.alibaba.boot</groupId>
    <artifactId>dubbo-spring-boot-starter</artifactId>
    <version>0.2.0</version>
</dependency>

这个很重要，因为不同的dubbo和springboot的版本不一样，可能要选择的结合包也不一样。这里我只展示使用xml来实现简单功能，首先我们先来看xml配置使用：

第一：在公共模块增加一个接口代码，代码略

第二：在提供方实现相应的接口，代码没有任何业务逻辑，只是演示用，

 package org.yongcheng.liuyang.service.impl;

 import org.yongcheng.liuyang.service.TestService;

 import com.alibaba.dubbo.config.annotation.Service;

 //@Service(version = "1.0.0")
 @org.springframework.stereotype.Service
 public class TestServiceImpl implements TestService {

     @Override
     public String sayHello(String name) {
         return name+"hello";
     }
 }

第三：配置dubbo.xml文件具体如下代码：

<?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://dubbo.apache.org/schema/dubbo"
    xsi:schemaLocation="http://www.springframework.org/schema/beans
    http://www.springframework.org/schema/beans/spring-beans.xsd
    http://dubbo.apache.org/schema/dubbo
    http://dubbo.apache.org/schema/dubbo/dubbo.xsd">

    <!-- 提供方应用信息，用于计算依赖关系 -->
    <dubbo:application name="dubbo-provider"  />

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

    <!-- 用dubbo协议在20880端口暴露服务 -->
    <dubbo:protocol name="dubbo" port="20880" />

    <!-- 声明需要暴露的服务接口 -->
    <dubbo:service interface="org.yongcheng.liuyang.service.TestService" ref="demoService" />

    <!-- 和本地bean一样实现服务 -->
    <bean id="demoService" class="org.yongcheng.liuyang.service.impl.TestServiceImpl" />
</beans>

第四：提供程序启动类

package org.yongcheng.liuyang;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.annotation.ImportResource;

@SpringBootApplication
@ImportResource("classpath:dubbo.xml")
public class ProviderApp {
    public static void main(String[] args) throws Exception {
        SpringApplication.run(ProviderApp.class, args);
    }

}

好了提供方的代码完成，接下俩就是消费方的步骤：

消费方的pom依赖和提供方基本一样，直接复用，但是由于消费方使用的是web工程，因此需要多一个依赖：

<dependency>

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

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

</dependency>

第一：pom文件：

<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>org.yongcheng.liuyang</groupId>
  <artifactId>dubbo-consumer</artifactId>
  <version>0.0.1-SNAPSHOT</version>

   <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.0.4.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>

  <dependencies>
      <dependency>
        <groupId>com.alibaba</groupId>
        <artifactId>dubbo</artifactId>
        <version>2.6.2</version>
        <exclusions>
             <exclusion>
                 <artifactId>spring</artifactId>
                 <groupId>org.springframework</groupId>
             </exclusion>
         </exclusions>
    </dependency>

    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-web</artifactId>
    </dependency>

    <dependency>
        <groupId>com.alibaba.boot</groupId>
        <artifactId>dubbo-spring-boot-starter</artifactId>
        <version>0.2.0</version>
    </dependency>

    <dependency>
        <groupId>org.javassist</groupId>
        <artifactId>javassist</artifactId>
        <version>3.20.0-GA</version>
    </dependency>

    <dependency>
        <groupId>org.jboss.netty</groupId>
        <artifactId>netty</artifactId>
        <version>3.2.5.Final</version>
    </dependency>

    <dependency>
        <groupId>org.apache.zookeeper</groupId>
        <artifactId>zookeeper</artifactId>
        <version>3.4.10</version>
        <exclusions>
            <exclusion>
                <artifactId>slf4j-log4j12</artifactId>
                <groupId>org.slf4j</groupId>
            </exclusion>
        </exclusions>
    </dependency>

    <dependency>
        <groupId>com.github.sgroschupf</groupId>
        <artifactId>zkclient</artifactId>
        <version>0.1</version>
    </dependency>
  </dependencies>

  <build>
      <plugins>
          <plugin>
            <groupId>org.apache.maven.plugins</groupId>
            <artifactId>maven-compiler-plugin</artifactId>
            <configuration>
                <source>1.8</source>
                <target>1.8</target>
            </configuration>
          </plugin>

          <!-- Spingboot的插件 -->
          <plugin>
              <groupId>org.springframework.boot</groupId>
             <artifactId>spring-boot-maven-plugin</artifactId>
          </plugin>
      </plugins>
  </build>
</project>

第二：简单业务代码实现：

package org.yongcheng.liuyang.controller;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import org.yongcheng.liuyang.service.TestService;

import com.alibaba.dubbo.config.annotation.Reference;

@RestController
@RequestMapping(produces="application/json;charset=UTF-8")
public class IndexActroller {

//    @Reference(url="dubbo://localhost:20880")
    @Autowired
    private TestService testService;

    @GetMapping("/sayHello")
    public String sayHello(String name){
        return testService.sayHello(name);
    }
}

第三：配置dubbo.xml文件具体如下代码：

<?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://dubbo.apache.org/schema/dubbo"
    xsi:schemaLocation="http://www.springframework.org/schema/beans
    http://www.springframework.org/schema/beans/spring-beans.xsd
    http://dubbo.apache.org/schema/dubbo
    http://dubbo.apache.org/schema/dubbo/dubbo.xsd">

    <!-- 提供方应用信息，用于计算依赖关系 -->
    <dubbo:application name="dubbo-consumer"  />

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

    <!-- 用dubbo协议在20880端口暴露服务 -->
    <dubbo:protocol name="dubbo" port="20880" />

    <!-- 声明需要暴露的服务接口 -->
    <dubbo:reference interface="org.yongcheng.liuyang.service.TestService" id="demoService" />

</beans>

第四：提供程序启动类

package org.yongcheng.liuyang;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.annotation.ImportResource;

@SpringBootApplication
@ImportResource("classpath:dubbo.xml")
public class ConsumerApp {
    public static void main(String[] args) throws Exception {
        SpringApplication.run(ConsumerApp.class, args);
    }
}

好了，这样整体的发布和调用代码已经完毕，接下来先启动提供方的代码，然后在启动调用方的程序，然后我们在浏览器中输入我们的url进行验证即可！

如果有朋友需要注解实现的代码，请留言！！！