Duboo-入门到学废【上篇】

1🥞.什么是duboo

2🌭.架构图

3.🍿快速入门

4.🧇浅浅理解

1.什么是duboo🤶🤶🤶

Dubbo是一个由阿里巴巴开发的基于Java的开源RPC框架。它提供了高性能、透明化的远程方法调用，以及服务自动注册和发现、负载均衡、容错、限流、监控等功能，使得分布式应用开发变得更加简单。Dubbo广泛应用于阿里巴巴内部服务化架构，也是国内外很多大型互联网公司的首选框架之一。

2.架构图🤶🤶🤶

Provider:暴露服务的服务提供方
Container：服务运行容器
Consumer:调用远程服务的服务消费方
Registry:服务注册与发现的注册中心
Monitor：统计服务的调用次数和调用时间的监控中心

3.快速入门 🤶🤶🤶

基本步骤：

①创建服务提供者Provider模块
②创建服务消费者Consumer模块
③在服务提供者模块编写UserServicelmpl 提供服务
④在服务消费者中的UserController远程调用UserServicelmpl 提供的服务
⑤分别启动两个服务，测试

3.1user-api 💕💕

创建一个模块作为公共接口

public interface UserService {public String say();
}

3.2user-service 💕💕

创建逻辑模块

1.导入依赖：

1.引入user-api，

2.tomcat端口为9000

   <properties><spring.version>5.1.9.RELEASE</spring.version><dubbo.version>2.7.4.1</dubbo.version><zookeeper.version>4.0.0</zookeeper.version></properties><dependencies><dependency><groupId>javax.servlet</groupId><artifactId>javax.servlet-api</artifactId><version>3.1.0</version><scope>provided</scope></dependency><dependency><groupId>org.springframework</groupId><artifactId>spring-context</artifactId><version>${spring.version}</version></dependency><dependency><groupId>org.springframework</groupId><artifactId>spring-webmvc</artifactId><version>${spring.version}</version></dependency><dependency><groupId>org.slf4j</groupId><artifactId>slf4j-api</artifactId><version>1.7.21</version></dependency><dependency><groupId>org.slf4j</groupId><artifactId>slf4j-log4j12</artifactId><version>1.7.21</version></dependency><dependency><groupId>org.apache.dubbo</groupId><artifactId>dubbo</artifactId><version>${dubbo.version}</version></dependency><dependency><groupId>org.apache.curator</groupId><artifactId>curator-framework</artifactId><version>${zookeeper.version}</version></dependency><dependency><groupId>org.apache.curator</groupId><artifactId>curator-recipes</artifactId><version>${zookeeper.version}</version></dependency><dependency><groupId>org.example</groupId><artifactId>user-api</artifactId><version>1.0-SNAPSHOT</version></dependency></dependencies><build><plugins><plugin><groupId>org.apache.tomcat.maven</groupId><artifactId>tomcat7-maven-plugin</artifactId><version>2.1</version><configuration><port>9000</port><path>/</path></configuration></plugin></plugins></build>

2.创建spring.xml:

配置zookeeper（注册中心）的 ip地址和端口

     <!--项目名称--><dubbo:application name="dubbo-service"></dubbo:application><!--注册中心zookeeper地址--><dubbo:registry address="zookeeper://192.168.20.130:2181"></dubbo:registry><dubbo:annotation package="com.xz.service.impl"></dubbo:annotation>

3.配置web.xml

    <context-param><param-name>contextConfigLocation</param-name><param-value>classpath*:spring*.xml</param-value></context-param><listener><listener-class>org.springframework.web.context.ContextLoaderListener</listener-class></listener>

4.逻辑代码实现

@Service//将这个类提供的方法，对外发布，将访问的地址 ip 端口，注册到注册中心中
public class UserServiceImpl implements UserService {@Overridepublic String say() {return "hello xiaoZhang~";}
}

3.3user-web💕💕

创建一个模块，作为访问层接口

1.导入依赖

1.引入user-api，

2.tomcat端口为8000

<properties><spring.version>5.1.9.RELEASE</spring.version><dubbo.version>2.7.4.1</dubbo.version><zookeeper.version>4.0.0</zookeeper.version></properties><dependencies><dependency><groupId>javax.servlet</groupId><artifactId>javax.servlet-api</artifactId><version>3.1.0</version><scope>provided</scope></dependency><dependency><groupId>org.springframework</groupId><artifactId>spring-context</artifactId><version>${spring.version}</version></dependency><dependency><groupId>org.springframework</groupId><artifactId>spring-webmvc</artifactId><version>${spring.version}</version></dependency><dependency><groupId>org.slf4j</groupId><artifactId>slf4j-api</artifactId><version>1.7.21</version></dependency><dependency><groupId>org.slf4j</groupId><artifactId>slf4j-log4j12</artifactId><version>1.7.21</version></dependency><dependency><groupId>org.apache.dubbo</groupId><artifactId>dubbo</artifactId><version>${dubbo.version}</version></dependency><dependency><groupId>org.apache.curator</groupId><artifactId>curator-framework</artifactId><version>${zookeeper.version}</version></dependency><dependency><groupId>org.apache.curator</groupId><artifactId>curator-recipes</artifactId><version>${zookeeper.version}</version></dependency><dependency><groupId>org.example</groupId><artifactId>user-api</artifactId><version>1.0-SNAPSHOT</version></dependency></dependencies><build><plugins><plugin><groupId>org.apache.tomcat.maven</groupId><artifactId>tomcat7-maven-plugin</artifactId><version>2.1</version><configuration><port>8000</port><path>/</path></configuration></plugin></plugins></build>

2.配置web.xml

<!--springmvc--><servlet><servlet-name>springmvc</servlet-name><servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class><init-param><param-name>contextConfigLocation</param-name><param-value>classpath:springmvc.xml</param-value></init-param></servlet><servlet-mapping><servlet-name>springmvc</servlet-name><url-pattern>*.do</url-pattern></servlet-mapping>

3.配置springmvc.xml

引入zookeeper（注册中心）的ip地址和端口，以及要扫描的包

  <mvc:annotation-driven/><context:component-scan base-package="com.xz.controller"></context:component-scan><!--项目名称--><dubbo:application name="dubbo-web"></dubbo:application><!--注册中心zookeeper地址--><dubbo:registry address="zookeeper://192.168.20.130:2181"></dubbo:registry><dubbo:annotation package="com.xz.controller"></dubbo:annotation>

4.controller接口实现

@Reference的作用：
1.从zookeeper（注册中心）获取userService的访问url
2.进行远程调用RPC
3.将结果封装为代理对象，给变量赋值

@RestController
@RequestMapping("/user")
public class UserController {@Reference//远程注入private UserService userService;@RequestMapping("/say")public String say(){return userService.say();}}