dubbo-HelloWorld
安装Zookeeper
HelloWorld
创建maven父工程,引入如下依赖
<dependencies>
<!-- https://mvnrepository.com/artifact/org.apache.dubbo/dubbo -->
<dependency>
<groupId>org.apache.dubbo</groupId>
<artifactId>dubbo</artifactId>
<version>2.7.8</version>
</dependency>
<!-- https://mvnrepository.com/artifact/org.apache.dubbo/dubbo-dependencies-zookeeper -->
<dependency>
<groupId>org.apache.dubbo</groupId>
<artifactId>dubbo-dependencies-zookeeper</artifactId>
<version>2.7.8</version>
<type>pom</type>
</dependency>
</dependencies>
创建三个子模块,dubbo-api、dubbo-provider、dubbo-consumer
dubbo-api
定义接口
public interface DemoService {
String sayHello(String name);
}
dubbo-provider
服务提供者需要引入dubbo-api模块。
实现DemoService
接口
public class DemoServiceImpl implements DemoService {
@Override
public String sayHello(String name) {
return "Hello " + name;
}
}
在resources目录下新建provider.xml文件,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://dubbo.apache.org/schema/dubbo"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-4.3.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="hello-world-app" />
<!-- 使用multicast广播注册中心暴露服务地址 -->
<dubbo:registry address="zookeeper://127.0.0.1:2181" />
<!-- 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="com.lzc.dubbo.api.DemoService" ref="demoService" />
<!-- 和本地bean一样实现服务 -->
<bean id="demoService" class="com.lzc.dubbo.provider.DemoServiceImpl" />
</beans>
在resources目录下新建log4j.properties(用来打印日志的配置文件)文件,内容如下
###set log levels###
log4j.rootLogger=info, stdout
###output to the console###
log4j.appender.stdout=org.apache.log4j.ConsoleAppender
log4j.appender.stdout.Target=System.out
log4j.appender.stdout.layout=org.apache.log4j.PatternLayout
log4j.appender.stdout.layout.ConversionPattern=[%d{dd/MM/yy HH:mm:ss:SSS z}] %t %5p %c{2}: %m%n
启动服务提供者
public class Provider {
public static void main(String[] args) throws Exception {
ClassPathXmlApplicationContext context = new ClassPathXmlApplicationContext(new String[]{"provider.xml"});
context.start();
System.in.read(); // 按任意键退出
}
}
dubbo-consumer
服务消费者需要引入dubbo-api模块。。在resources目录下新建consumer.xml文件,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://dubbo.apache.org/schema/dubbo"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-4.3.xsd http://dubbo.apache.org/schema/dubbo http://dubbo.apache.org/schema/dubbo/dubbo.xsd">
<!-- 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 -->
<dubbo:application name="consumer-of-hello-world-app" />
<!-- 使用multicast广播注册中心暴露发现服务地址 -->
<dubbo:registry address="zookeeper://127.0.0.1:2181"/>
<!-- 生成远程服务代理,可以和本地bean一样使用demoService -->
<dubbo:reference id="demoService"
interface="com.lzc.dubbo.api.DemoService" />
</beans>
调用服务提供方
public class Consumer {
public static void main(String[] args) throws Exception {
ClassPathXmlApplicationContext context = new ClassPathXmlApplicationContext(new String[] {"consumer.xml"});
context.start();
DemoService demoService = (DemoService)context.getBean("demoService"); // 获取远程服务代理
String hello = demoService.sayHello("world"); // 执行远程方法
System.out.println( hello ); // 显示调用结果
}
}
整合SpringBoot
创建SpringBoot父工程,加入如下依赖
<?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 https://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.example</groupId>
<artifactId>dubbo</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>dubbo</name>
<description>Demo project for Spring Boot</description>
<packaging>pom</packaging>
<properties>
<java.version>1.8</java.version>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
<!-- springboot集成dubbo的起步依赖 -->
<dependency>
<groupId>org.apache.dubbo</groupId>
<artifactId>dubbo-spring-boot-starter</artifactId>
<version>2.7.7</version>
<exclusions>
<exclusion>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-log4j12</artifactId>
</exclusion>
</exclusions>
</dependency>
<dependency>
<groupId>org.apache.dubbo</groupId>
<artifactId>dubbo-dependencies-zookeeper</artifactId>
<version>2.7.7</version>
<type>pom</type>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
</project>
创建三个子模块dubbo-interface、dubbo-provider、dubbo-consumer
dubbo-interface
编写一个接口类
public interface UserService {
User getUserById(Integer id);
}
dubbo-provider
服务提供者需要引入dubbo-interface模块。
实现UserService接口
@DubboService
public class UserServiceImpl implements UserService {
@Override
public User getUserById(Integer id) {
return new User(id, "zhangsan");
}
}
application.properties内容如下
server.port=8091
# spring项目名
spring.application.name=dubbo-provider-demo
# Dubbo provider configuration
# dubbo.application.name=${spring.application.name}
dubbo.registry.protocol=zookeeper
dubbo.registry.address=127.0.0.1:2181
# Dubbo Protocol
dubbo.protocol.name=dubbo
# Random port
dubbo.protocol.port=-1
# 扫描注解包通过该设置将服务注册到zookeeper
dubbo.scan.base-packages=com.example.dubbo.provider.service
启动类
@SpringBootApplication
public class DubboProviderApplication {
public static void main(String[] args) {
SpringApplication.run(DubboProviderApplication.class, args);
}
}
dubbo-consumer
服务消费者需要引入dubbo-interface模块。
创建DemoController,用来调用服务提供方
@RestController
public class DemoController {
@DubboReference
private UserService userService;
@GetMapping("/demo/{id}")
public User demo(@PathVariable Integer id) {
return userService.getUserById(id);
}
}
application.properties内容如下
server.port=8092
# spring项目名
spring.application.name=dubbo-consumer-demo
dubbo.registry.protocol=zookeeper
dubbo.registry.address=zookeeper://127.0.0.1:2181
启动类
@SpringBootApplication
public class DubboConsumerApplication {
public static void main(String[] args) {
SpringApplication.run(DubboConsumerApplication.class, args);
}
}
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