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Dubbo学习笔记

一、说明：

本次学习Dubbo，分别针对三种情况组合写个三个Demo，每个Demo都提供了两个程序：Provider和consumer，provider就是服务的提供方，对外开放接口，consumer是服务的消费方，调用provider提供的服务（通过RPC的方式调用的）；

Provider和consumer程序都公用一个相同的接口（包名和类型必须完全相同，否则调用会报错的），这个接口可以放到一个公共的api包里面，然后provider和consumer都要依赖这个包；我在这里就偷了个懒，直接把接口定义到程序里面了；这三个Demo里面使用的公共接口定义如下：

1 public interface TestIntf {
2     String sayHello();
3 }

此次将学习时搭建的三个Demo记录下来，方便以后查阅；

二、SpringMVC+Zookeeper+Dubbo的搭建：

1、先搭建一个SpringMVC工程；

2、POM依赖：

 1 <properties>
 2     <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
 3     <maven.compiler.source>1.7</maven.compiler.source>
 4     <maven.compiler.target>1.7</maven.compiler.target>
 5     <spring.version>4.2.6.RELEASE</spring.version>
 6   </properties>
 7 
 8   <dependencies>
 9 
10     <dependency>
11       <groupId>org.springframework</groupId>
12       <artifactId>spring-beans</artifactId>
13       <version>${spring.version}</version>
14     </dependency>
15 
16     <!-- dubbo相关 -->
17     <dependency>
18       <groupId>com.alibaba</groupId>
19       <artifactId>dubbo</artifactId>
20       <version>2.5.6</version>
21     </dependency>
22     <dependency>
23       <groupId>org.apache.zookeeper</groupId>
24       <artifactId>zookeeper</artifactId>
25       <version>3.4.12</version>
26     </dependency>
27 
28     <dependency>
29       <groupId>com.github.sgroschupf</groupId>
30       <artifactId>zkclient</artifactId>
31       <version>0.1</version>
32     </dependency>
33 
34     <dependency>
35       <groupId>org.springframework</groupId>
36       <artifactId>spring-web</artifactId>
37       <version>${spring.version}</version>
38     </dependency>
39     <dependency>
40       <groupId>org.springframework</groupId>
41       <artifactId>spring-webmvc</artifactId>
42       <version>${spring.version}</version>
43     </dependency>
44     <dependency>
45       <groupId>org.springframework</groupId>
46       <artifactId>spring-context</artifactId>
47       <version>${spring.version}</version>
48     </dependency>
49   </dependencies>

3、applicationContext.xml配置文件的定义：

 1 <?xml version="1.0" encoding="UTF-8"?>
 2 <beans xmlns="http://www.springframework.org/schema/beans"
 3        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 4        xmlns:dubbo="http://code.alibabatech.com/schema/dubbo"
 5        xmlns:context="http://www.springframework.org/schema/context"
 6        xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
 7                            http://code.alibabatech.com/schema/dubbo http://code.alibabatech.com/schema/dubbo/dubbo.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd">
 8     
 9     <context:component-scan base-package="com.demo.dubbo.provider" />
10 
11     <dubbo:application name="dubbo-provider"/>
12     <dubbo:registry address="zookeeper://127.0.0.1:2181"/>
13     <dubbo:protocol name="dubbo" port="20880" />
14     <dubbo:annotation package="com.demo.dubbo.provider.service.impl" />
15 </beans>

4、服务实现类：

1 import com.alibaba.dubbo.config.annotation.Service;
2 
3 @Service
4 public class TestIntfImpl implements TestIntf {
5     @Override
6     public String sayHello() {
7         return "hello, this is a dubbo demo project";
8     }
9 }

注意：这里引用的@Service注解必须是dubbo包里面定义的，不能是Spring里面定义的那个，否则报错信息会莫名其妙；

5、同样可以在provider包里面实现Controller并调用刚才的服务接口：

 1 @Controller
 2 public class IndexController {
 3 
 4     @Resource
 5     private TestIntf testIntf;
 6 
 7     @RequestMapping(value = "/home")
 8     @ResponseBody
 9     public String index() {
10         return testIntf.sayHello();
11     }
12 }

6、建立一个SpringMVC工程consumer，POM.xml文件的定义和provider工程的一样；

7、Dubbo.xml文件定义：

 1 <?xml version="1.0" encoding="UTF-8"?>
 2 <beans xmlns="http://www.springframework.org/schema/beans"
 3        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 4        xmlns:dubbo="http://code.alibabatech.com/schema/dubbo"
 5        xsi:schemaLocation="http://www.springframework.org/schema/beans
 6      http://www.springframework.org/schema/beans/spring-beans.xsd
 7      http://code.alibabatech.com/schema/dubbo
 8      http://code.alibabatech.com/schema/dubbo/dubbo.xsd">
 9 
10     <!-- 消费方应用名，用于计算依赖关系，不是匹配条件，不要与提供方一样 -->
11     <dubbo:application name="dubbo-consumer"  />
12 
13     <!--&lt;!&ndash; 使用multicast广播注册中心暴露发现服务地址 &ndash;&gt;-->
14     <dubbo:registry address="zookeeper://127.0.0.1:2181" />
15 
16     <!-- 生成远程服务代理，可以和本地bean一样使用demoService -->
17     <dubbo:reference id="testIntf" interface="com.demo.dubbo.TestIntf" />
18 </beans>

8、dispatcher-servlet.xml文件引入dubbo.xml文件：

<import resource="dubbo.xml"/>

9、在Controller中调用RPC服务：

 1 @Controller
 2 public class IndexController {
 3     @Resource
 4     private TestIntf testIntf;
 5 
 6     @RequestMapping("/home")
 7     @ResponseBody
 8     public String index() {
 9         return testIntf.sayHello();
10     }
11 }

三、SpringBoot+Zookeeper+Dubbo的搭建：

1、新建立两个SpringBoot工程provider和consumer；

2、POM.xml文件引入依赖（provider和consumer工程引入的依赖是一样的）：

 1 <properties>
 2         <java.version>1.8</java.version>
 3     </properties>
 4 
 5     <dependencies>
 6         <dependency>
 7             <groupId>org.springframework.boot</groupId>
 8             <artifactId>spring-boot-starter-web</artifactId>
 9         </dependency>
10         <dependency>
11             <groupId>com.alibaba.spring.boot</groupId>
12             <artifactId>dubbo-spring-boot-starter</artifactId>
13             <version>2.0.0</version>
14         </dependency>
15         <dependency>
16             <groupId>com.101tec</groupId>
17             <artifactId>zkclient</artifactId>
18             <version>0.3</version>
19         </dependency>
20         <dependency>
21             <groupId>org.apache.zookeeper</groupId>
22             <artifactId>zookeeper</artifactId>
23             <version>3.4.6</version>
24         </dependency>
25     </dependencies>

3、dubbo.properties文件配置：

1 spring.dubbo.application.name=provider_boot
2 spring.dubbo.registry.protocol=zookeeper
3 spring.dubbo.registry.address=127.0.0.1:2181
4 spring.dubbo.protocol.name=dubbo
5 spring.dubbo.protocol.port=20880
6 spring.dubbo.scan=com.demo.dubbo.provider

4、dubbo.xml文件配置：

 1 <?xml version="1.0" encoding="UTF-8"?>
 2 <beans xmlns="http://www.springframework.org/schema/beans"
 3        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:dubbo="http://code.alibabatech.com/schema/dubbo"
 4        xsi:schemaLocation="http://www.springframework.org/schema/beans
 5     http://www.springframework.org/schema/beans/spring-beans.xsd
 6     http://code.alibabatech.com/schema/dubbo
 7     http://code.alibabatech.com/schema/dubbo/dubbo.xsd">
 8 
 9     <bean id="testIntf" class="com.demo.dubbo.provider.service.impl.TestIntfImpl" />
10 
11     <!-- 提供方应用信息，用于计算依赖关系 -->
12     <dubbo:application name="provider_boot" />
13     <dubbo:registry protocol="zookeeper" address="127.0.0.1:2181" />
14     <!-- 暴露服务 -->
15     <dubbo:protocol name="dubbo" port="20880" />
16     <dubbo:service interface="com.demo.dubbo.TestIntf"
17                    ref="testIntf" retries="0" timeout="6000" />
18 </beans>

5、配置类DubboConfig.java：

1 @Configuration
2 @PropertySource("/dubbo.properties")
3 @ImportResource({"/dubbo.xml"})
4 public class DubboConfig {
5 }

6、服务实现类：

1 import com.alibaba.dubbo.config.annotation.Service;
2 
3 @Service(version = "1.0.0")
4 public class TestIntfImpl implements TestIntf {
5     @Override
6     public String sayHello() {
7         return "this is a provider Demo for SpringBoot and Dubbo";
8     }
9 }

7、Consumer程序的dubbo.properties文件定义：

1 spring.dubbo.application.name=consumer_boot
2 spring.dubbo.registry.protocol=zookeeper
3 spring.dubbo.registry.address=127.0.0.1:2181
4 spring.dubbo.protocol.name=dubbo
5 spring.dubbo.protocol.port=20880
6 spring.dubbo.scan=com.demo.dubbo.consumer

8、Consumer程序的dubbo.xml文件定义：

 1 <?xml version="1.0" encoding="UTF-8"?>
 2 <beans xmlns="http://www.springframework.org/schema/beans"
 3        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:dubbo="http://code.alibabatech.com/schema/dubbo"
 4        xsi:schemaLocation="http://www.springframework.org/schema/beans
 5     http://www.springframework.org/schema/beans/spring-beans.xsd
 6     http://code.alibabatech.com/schema/dubbo
 7     http://code.alibabatech.com/schema/dubbo/dubbo.xsd">
 8 
 9     <!-- 提供方应用信息，用于计算依赖关系 -->
10     <dubbo:application name="consumer_boot" />
11     <dubbo:registry protocol="zookeeper" address="127.0.0.1:2181" />
12     <!-- 暴露服务 -->
13     <dubbo:protocol name="dubbo" port="20880" />
14     <dubbo:reference id="testIntf" interface="com.demo.dubbo.TestIntf" />
15 </beans>

如果consumer和provider程序是在一台机器上运行的，那么这里就要在application.properties文件里面更改下端口；

9、配置文件DubboConfig.java文件定义：

1 @Configuration
2 @PropertySource("/dubbo.properties")
3 @ImportResource({"/dubbo.xml"})
4 public class DubboConfig {
5 }

10、RPC服务调用的Controller的调用实现：

 1 @RestController
 2 @RequestMapping("/consumer")
 3 public class IndexController {
 4 
 5     @Resource
 6     private TestIntf testIntf;
 7 
 8     @GetMapping("/home")
 9     public String index() {
10         return testIntf.sayHello();
11     }
12 }

四、SpringBoot+nacos+Dubbo的搭建：

1、新建立两个SpringBoot工程provider和consumer；

2、POM.xml文件引入依赖（consumer工程的依赖是一样的）：

 1 <properties>
 2     <java.version>1.8</java.version>
 3     <nacos-config-spring-boot.version>0.2.1</nacos-config-spring-boot.version>
 4     <netty-all.version>4.0.35.Final</netty-all.version>
 5 </properties>
 6 
 7 <dependencies>
 8     <!--springboot有关-->
 9     <dependency>
10         <groupId>org.springframework.boot</groupId>
11         <artifactId>spring-boot-starter-actuator</artifactId>
12     </dependency>
13     <dependency>
14         <groupId>org.springframework.boot</groupId>
15         <artifactId>spring-boot-starter</artifactId>
16     </dependency>
17     <dependency>
18         <groupId>org.springframework.boot</groupId>
19         <artifactId>spring-boot-starter-web</artifactId>
20     </dependency>
21     <dependency>
22         <groupId>org.springframework.boot</groupId>
23         <artifactId>spring-boot-starter-test</artifactId>
24         <scope>test</scope>
25     </dependency>
26 
27     <!--dubbo有关-->
28     <dependency>
29         <groupId>com.alibaba</groupId>
30         <artifactId>dubbo-registry-nacos</artifactId>
31         <version>2.6.6</version>
32     </dependency>
33     <dependency>
34         <groupId>com.alibaba.nacos</groupId>
35         <artifactId>nacos-client</artifactId>
36         <version>0.6.2</version>
37     </dependency>
38     <dependency>
39         <groupId>com.alibaba</groupId>
40         <artifactId>dubbo-common</artifactId>
41         <version>2.6.6</version>
42     </dependency>
43     <dependency>
44         <groupId>com.alibaba</groupId>
45         <artifactId>dubbo-registry-api</artifactId>
46         <version>2.6.6</version>
47     </dependency>
48     <dependency>
49         <groupId>com.alibaba</groupId>
50         <artifactId>dubbo</artifactId>
51         <version>2.6.6</version>
52     </dependency>
53     <dependency>
54         <groupId>com.alibaba.boot</groupId>
55         <artifactId>dubbo-spring-boot-starter</artifactId>
56         <version>0.2.1.RELEASE</version>
57     </dependency>
58     <dependency>
59         <groupId>com.alibaba.boot</groupId>
60         <artifactId>dubbo-spring-boot-autoconfigure</artifactId>
61         <version>0.2.1.RELEASE</version>
62     </dependency>
63     <dependency>
64         <groupId>io.netty</groupId>
65         <artifactId>netty-all</artifactId>
66         <version>${netty-all.version}</version>
67     </dependency>
68     <!-- rest有关 -->
69     <dependency>
70         <groupId>org.jboss.resteasy</groupId>
71         <artifactId>jaxrs-api</artifactId>
72         <version>3.0.12.Final</version>
73     </dependency>
74     <dependency>
75         <groupId>org.jboss.resteasy</groupId>
76         <artifactId>resteasy-client</artifactId>
77         <version>3.0.12.Final</version>
78     </dependency>
79 </dependencies>

3、Application.yml配置文件定义：

 1 dubbo:
 2   application:
 3     name: provider-nacos-demo
 4     id: provider-nacos-demo
 5   registry:
 6     address: nacos://127.0.0.1:8848
 7   protocols:
 8     dubbo:
 9       name: dubbo
10       port: -1
11       server: tomcat
12 spring:
13   application:
14     name: provider-nacos-demo
15   main:
16     allow-bean-definition-overriding: true
17 server:
18   port: 8080

4、接口实现类：

 1 import com.alibaba.dubbo.config.annotation.Service;
 2 
 3 @Service
 4 public class TestIntfImpl implements TestIntf {
 5 
 6     @Override
 7     public String sayHello() {
 8         return "这是provider程序远程调用返回的结果";
 9     }
10 }

5、应用程序类ProviderApplication需要添加@EnableDubbo注解；consumer工程的应用程序类也要添加这个注解；

6、Consumer工程的application.yml配置如下：

 1 dubbo:
 2   application:
 3     name: consumer-nacos-demo
 4     id: consumer-nacos-demo
 5   registry:
 6     address: nacos://127.0.0.1:8848
 7   protocols:
 8     dubbo:
 9       name: dubbo
10       port: -2
11       server: tomcat
12 spring:
13   application:
14     name: consumer-nacos-demo
15   main:
16     allow-bean-definition-overriding: true
17 server:
18   port: 8081

7、Controller中调用provider中的RPC服务代码：

 1 import com.alibaba.dubbo.config.annotation.Reference;
 2 import org.springframework.web.bind.annotation.GetMapping;
 3 import org.springframework.web.bind.annotation.RequestMapping;
 4 import org.springframework.web.bind.annotation.RestController;
 5 
 6 @RestController
 7 @RequestMapping("/consumer")
 8 public class IndexController {
 9 
10     @Reference
11     private TestIntf testIntf;
12 
13     @GetMapping("/home")
14     public String getUser(){
15         String result = testIntf.sayHello();
16         return result;
17     }
18 }

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原文地址：https://www.cnblogs.com/laoxia/p/11553264.html