本帖最后由 张11。。。 于 2019-12-23 09:11 编辑
Dubbo快速入门 Dubbo快速入门
Dubbo作为一个RPC框架，其最核心的功能就是要实现跨网络的远程调用。本小节就是要创建两个应用，一个作为服务的提供方，一个作为服务的消费方。通过Dubbo来实现服务消费方远程调用服务提供方的方法。 服务提供方开发 开发步骤： （1）创建maven工程（打包方式为war）dubbo-service-provider，在pom.xml文件中导入如下坐标 <properties>
<spring.version>5.0.5.RELEASE</spring.version>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-context</artifactId>
<version>${spring.version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-beans</artifactId>
<version>${spring.version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-webmvc</artifactId>
<version>${spring.version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-aspects</artifactId>
<version>${spring.version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-context-support</artifactId>
<version>${spring.version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-jdbc</artifactId>
<version>${spring.version}</version>
</dependency>
<!-- dubbo相关 -->
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>dubbo</artifactId>
<version>2.6.0</version>
</dependency>
<dependency>
<groupId>org.apache.zookeeper</groupId>
<artifactId>zookeeper</artifactId>
<version>3.4.7</version>
</dependency>
<dependency>
<groupId>com.github.sgroschupf</groupId>
<artifactId>zkclient</artifactId>
<version>0.1</version>
</dependency>
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>fastjson</artifactId>
<version>1.2.47</version>
</dependency>
</dependencies>
（2）配置web.xml文件 <!DOCTYPE web-app PUBLIC
"-//SunMicrosystems, Inc.//DTD Web Application 2.3//EN"
"http://java.sun.com/dtd/web-app_2_3.dtd">
<web-app>
<display-name>ArchetypeCreated Web Application</display-name>
<context-param>
<param-name>contextConfigLocation</param-name>
<param-value>classpath:dubbo-provider.xml</param-value>
</context-param>
<listener>
<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
</listener>
</web-app>
（3）创建服务接口
package cn.itcast.dubbo.service;
public interface HelloService {
String sayHello(String name);
}
（4）创建服务实现类
package cn.itcast.dubbo.service.impl;
import cn.itcast.dubbo.service.HelloService;
import com.alibaba.dubbo.config.annotation.Service;
@Service
public class HelloServiceImpl implements HelloService {
@Override
public String sayHello(String name) {
System.out.println("-------我HelloService运行了-----------");
return "hello" + name;
}
}
注意：服务实现类上使用的Service注解是Dubbo提供的，用于对外发布服务 （5）在src/main/resources下创建applicationContext-service.xml
<?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:p="http://www.springframework.org/schema/p"
xmlns:context="http://www.springframework.org/schema/context"
xmlns:dubbo="http://code.alibabatech.com/schema/dubbo"
xmlns:mvc="http://www.springframework.org/schema/mvc" xmlns:dubdo="http://code.alibabatech.com/schema/dubbo"
xmlns:tx="http://www.springframework.org/schema/tx"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/mvc
http://www.springframework.org/schema/mvc/spring-mvc.xsd
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/txhttp://www.springframework.org/schema/tx/spring-tx.xsd]http://www.springframework.org/schema/context/spring-context.xsdhttp://www.springframework.org/schema/txhttp://www.springframework.org/schema/tx/spring-tx.xsd[/url]">
<!-- 当前应用名称，用于注册中心计算应用间依赖关系，注意：消费者和提供者应用名不要一样 -->
<dubbo:application name="dubbo-service-provider" />
<!-- 连接服务注册中心zookeeper ip为zookeeper所在服务器的ip地址-->
<dubbo:registry address="zookeeper://192.168.154.133:2181"/>
<!-- 注册 协议和port 端口默认是20880 -->
<dubbo:protocol name="dubbo" port="20880"></dubbo:protocol>
<!-- 扫描指定包，加入@Service注解的类会被发布为服务 -->
<dubbo:annotation package="cn.itcast.dubbo.service.impl" />
</beans>
（6）将工程发布到tomcat启动服务 服务消费方开发 开发步骤： （1）创建maven工程（打包方式为war）dubbo-service-consumer，pom.xml配置和上面服务提供者相同 （2）配置web.xml文件
<!DOCTYPE web-app PUBLIC
"-//SunMicrosystems, Inc.//DTD Web Application 2.3//EN"
"http://java.sun.com/dtd/web-app_2_3.dtd">
<web-app>
<display-name>ArchetypeCreated Web Application</display-name>
<servlet>
<servlet-name>springmvc</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<!-- 指定加载的配置文件 ，通过参数contextConfigLocation加载 -->
<init-param>
<param-name>contextConfigLocation</param-name>
<param-value>classpath:applicationContext-consumer.xml</param-value>
</init-param>
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>springmvc</servlet-name>
<url-pattern>*.do</url-pattern>
</servlet-mapping>
</web-app>
（3）将服务提供者工程中的HelloService接口复制到当前工程,路径和服务提供者的路径要一致 （4）编写Controller
@Controller
@RequestMapping("/demo")
public class HelloController {
@Reference
private HelloService helloService;
@RequestMapping("/hello")
@ResponseBody
public String getName(String name){
//远程调用
String result = helloService.sayHello(name);
return result;
}
}
注意：Controller中注入HelloService使用的是Dubbo提供的@Reference注解 （5）在src/main/resources下创建applicationContext-consumer.xml
<?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:p="http://www.springframework.org/schema/p"
xmlns:context="http://www.springframework.org/schema/context"
xmlns:dubbo="http://code.alibabatech.com/schema/dubbo"
xmlns:mvc="http://www.springframework.org/schema/mvc"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/mvc
http://www.springframework.org/schema/mvc/spring-mvc.xsd
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">
<!-- 当前应用名称，用于注册中心计算应用间依赖关系，注意：消费者和提供者应用名不要一样 -->
<dubbo:application name="dubbo-service-consumer" />
<!-- 连接服务注册中心zookeeper ip为zookeeper所在服务器的ip地址-->
<dubbo:registry address="zookeeper://192.168.154.133:2181"/>
<!-- 扫描的方式暴露接口 -->
<dubbo:annotation package="cn.itcast.dubbo.controller" />
</beans>
（6）运行测试 在浏览器输入http://localhost:8081/demo/hello.do?name=james，查看浏览器输出结果 测试成功了！
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