SpringBoot+Dubbo+zookeeper Quick Start Case

Project directory structure:

Step 1: Create a SpringBoot project, here you can choose a Maven project or Spring Initializer, a Maven project (SpringBoot-Dubbo) is created here, and the pom.xml file is as follows:

<?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>

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.3.0.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>

    <groupId>com.ly</groupId>
    <artifactId>SpringBoot-Dubbo</artifactId>
    <packaging>pom</packaging>
    <version>0.0.1-SNAPSHOT</version>
    
    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter</artifactId>
            <version>2.3.0.RELEASE</version>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
            <exclusions>
                <exclusion>
                    <groupId>org.junit.vintage</groupId>
                    <artifactId>junit-vintage-engine</artifactId>
                </exclusion>
            </exclusions>
        </dependency>
    </dependencies>

</project>

Step 2: Add a Module, take dubbo-provider as an example,

you can use Maven to create or use Spring Initializr:

Step 3: Service provider dubbo-provider related configuration

Add dubbo usage dependencies and zookeeper dependencies in the pom.xml file:

<?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>SpringBoot-Dubbo</artifactId>
        <groupId>com.ly</groupId>
        <version>0.0.1-SNAPSHOT</version>
    </parent>
    <groupId>com.qunhongtech</groupId>
    <artifactId>dubbo-provider</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>dubbo-customer</name>
    <modelVersion>4.0.0</modelVersion>

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter</artifactId>
            <version>2.3.0.RELEASE</version>
        </dependency>
        
        <!--dubbo依赖-->
        <dependency>
            <groupId>com.alibaba.boot</groupId>
            <artifactId>dubbo-spring-boot-starter</artifactId>
            <version>0.2.0</version>
        </dependency>
        <!--zookeeper客户端依赖-->
        <dependency>
            <groupId>org.apache.zookeeper</groupId>
            <artifactId>zookeeper</artifactId>
            <version>3.4.13</version>
            <exclusions>
                <exclusion>
                    <groupId>org.slf4j</groupId>
                    <artifactId>slf4j-log4j12</artifactId>
                </exclusion>
                <exclusion>
                    <groupId>log4j</groupId>
                    <artifactId>log4j</artifactId>
                </exclusion>
            </exclusions>
        </dependency>

    </dependencies>
</project>

Modify the configuration file: application.yml

server:
  port: 8081             #Tomcat端口号
dubbo:
  application:
    name: dubbo-provider #应用名称
  protocol:
    name: dubbo
    port: 20880          #dubbo服务暴漏的端口号
  registry:
    address: zookeeper://127.0.0.1:2181  #zookeeper服务的地址以及端口号

Step 4: Service consumer dubbo-customer related configuration

Add dubbo usage dependencies and zookeeper dependencies in the pom.xml file:

<?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>SpringBoot-Dubbo</artifactId>
        <groupId>com.ly</groupId>
        <version>0.0.1-SNAPSHOT</version>
    </parent>
    <modelVersion>4.0.0</modelVersion>

    <groupId>com.ly</groupId>
    <artifactId>dubbo-customer</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>dubbo-customer</name>


    <dependencies>

        <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.apache.zookeeper</groupId>
            <artifactId>zookeeper</artifactId>
            <version>3.4.13</version>
            <exclusions>
                <exclusion>
                    <groupId>org.slf4j</groupId>
                    <artifactId>slf4j-log4j12</artifactId>
                </exclusion>
                <exclusion>
                    <groupId>log4j</groupId>
                    <artifactId>log4j</artifactId>
                </exclusion>
            </exclusions>
        </dependency>

    </dependencies>
</project>

Modify the configuration file: application.yml

server:
	port: 8082             #Tomcat端口号
dubbo:
  application:
    name: dubbo-customer   #应用名称
  registry:
    address: zookeeper://127.0.0.1:2181  #zookeeper服务的地址以及端口号

Step 5: Create a new interface in dubbo-api and implement it in dubbo-provider

Create an interface in dubbo-api: HelloService, you need to add dependencies in dubbo-provider and dubbo-customer when using:

public interface HelloService {
    
    

    String hello();

}

Implement the HelloService interface in dubbo-provider:

Create the interface implementation class HelloServiceImpl to implement the HelloService interface: The implementation code is as follows, note that the annotation @Service used here is not the service annotation of spring, but the annotation of dubbo:import com.alibaba.dubbo.config.annotation.Service;

@Service //发布服务
public class HelloServiceImpl implements HelloService {
    
    

    @Override
    public String hello() {
    
    
        return "Hello World...";
    }
}

And add an annotation to the launcher DubboProviderApplication: @EnableDubbo

Step 6: Try to call the HelloService interface remotely in dubbo-customer:

Create a new HelloController class, the code is as follows, you need to use dubbo's Reference annotation when you want to introduce a remote service:

@RestController
public class HelloController {
    
    

    @Reference //引用服务
    private HelloService helloService;

    @GetMapping("/hello")
    private String hello(){
    
    

        System.out.println("Hello World...");

        return helloService.hello();
    }

}

Test the code, first start the service provider: dubbo-provider, an error occurs because we have not started zookeeper

Download and install zookeeper, open the connection and select the appropriate version to install directly: https://zookeeper.apache.org/releases.html

The downloaded compressed package can be used in linux or windows. Here is an example of windows:

unzip the compressed package, find the bin directory and open it: the
directory is as follows, find zkServer.cmd, and double-click to start it:

The results are as follows:

Start again in sequence: 服务提供发：dubbo-provider, 服务消费方：dubbo-customer, and open the browser for testing. The results are as follows: