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dubbo-day01-Dubbo入门案例

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2023-12-01

Dubbo入门案例

1、Spring和SpringMVC整合

1.0、搭建案例环境

  • 创建dubbo-pro空项目，添加dubbo-service和dubbo-web的maven模块；

  • dubbo-service

    • 完整pom.xml文件，注意zookeeper包的版本依赖关系

    • 完整applicationContext.xml文件，添加log4j日志文件

    • 创建UserService接口，添加sayHello方法；提供实现类

    • install打包供dubbo-web调用

  • dubbo-web

    • 完整pom.xml文件

    • 完整spring-mvc.xml文件，添加log4j日志文件

    • 创建UserController类，提供sayHello方法，注解调用Userservice接口

1.1、目录

[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-lir3mBQK-1593928609119)(image/anli01.jpg)]

1.2、dubbo-service

1.2.1、pom.xml

<?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>

    <groupId>com.itheima</groupId>
    <artifactId>dubbo-service</artifactId>
    <version>1.0-SNAPSHOT</version>

    <properties>
        <spring.version>5.0.9.RELEASE</spring.version>
        <dubbo.version>2.7.4.1</dubbo.version>
        <zookeeper.version>2.11.0</zookeeper.version>
    </properties>

    <dependencies>
        <!-- servlet3.0规范的坐标 -->
        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>javax.servlet-api</artifactId>
            <version>3.1.0</version>
            <scope>provided</scope>
        </dependency>
        <!--spring的坐标-->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-context</artifactId>
            <version>${spring.version}</version>
        </dependency>
        <!--springmvc的坐标-->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-webmvc</artifactId>
            <version>${spring.version}</version>
        </dependency>

        <!--日志-->
        <dependency>
            <groupId>org.slf4j</groupId>
            <artifactId>slf4j-api</artifactId>
            <version>1.7.16</version>
        </dependency>
        <dependency>
            <groupId>org.slf4j</groupId>
            <artifactId>slf4j-log4j12</artifactId>
            <version>1.7.16</version>
        </dependency>


        <!--Dubbo的起步依赖，版本2.7之后统一为rg.apache.dubb -->
        <dependency>
            <groupId>org.apache.dubbo</groupId>
            <artifactId>dubbo</artifactId>
            <version>${dubbo.version}</version>
        </dependency>
        <!--ZooKeeper客户端实现 -->
        <!--<dependency>-->
        <!--<groupId>org.apache.curator</groupId>-->
        <!--<artifactId>curator-framework</artifactId>-->
        <!--<version>${zookeeper.version}</version>-->
        <!--</dependency>-->
        <!--ZooKeeper客户端实现 -->
        <!--<dependency>-->
        <!--<groupId>org.apache.curator</groupId>-->
        <!--<artifactId>curator-recipes</artifactId>-->
        <!--<version>${zookeeper.version}</version>-->
        <!--</dependency>-->
        <dependency>
            <groupId>org.apache.zookeeper</groupId>
            <artifactId>zookeeper</artifactId>
            <version>3.4.12</version>
        </dependency>
        <dependency>
            <groupId>org.apache.curator</groupId>
            <artifactId>curator-framework</artifactId>
            <version>2.11.0</version>
        </dependency>
        <dependency>
            <groupId>org.apache.curator</groupId>
            <artifactId>curator-recipes</artifactId>
            <version>2.11.0</version>
        </dependency>

    </dependencies>

</project>

1.2.2、applicationContext.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:dubbo="http://dubbo.apache.org/schema/dubbo" xmlns:context="http://www.springframework.org/schema/context"
	   xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
        http://dubbo.apache.org/schema/dubbo http://dubbo.apache.org/schema/dubbo/dubbo.xsd http://www.springframework.org/schema/context https://www.springframework.org/schema/context/spring-context.xsd">

	<context:component-scan base-package="com.itheima.service"/>

</beans>

1.2.3、log4j.properties

# DEBUG < INFO < WARN < ERROR < FATAL
# Global logging configuration
log4j.rootLogger=debug, stdout,file
# My logging configuration...
#log4j.logger.com.tocersoft.school=DEBUG
#log4j.logger.net.sf.hibernate.cache=debug
## Console output...
log4j.appender.stdout=org.apache.log4j.ConsoleAppender
log4j.appender.stdout.layout=org.apache.log4j.PatternLayout
log4j.appender.stdout.layout.ConversionPattern=%5p %d %C: %m%n

log4j.appender.file=org.apache.log4j.FileAppender
log4j.appender.file.File=../logs/iask.log
log4j.appender.file.layout=org.apache.log4j.PatternLayout
log4j.appender.file.layout.ConversionPattern=%d{yyyy-MM-dd HH:mm:ss}  %l  %m%n
1.2.4、UserService
package com.itheima.service;

public interface UserService {
    public String sayHello();
}

1.2.5、UserServiceImpl

package com.itheima.service.impl;

import com.itheima.service.UserService;
import org.springframework.stereotype.Service;

@Service
public class UserServiceImpl implements UserService {
    @Override
    public String sayHello() {
        return "Hello Dubbo ~ ";
    }
}

1.3、dubbo-web

1.3.1、pom.xml

<?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>

    <groupId>com.itheima</groupId>
    <artifactId>dubbo-web</artifactId>
    <version>1.0-SNAPSHOT</version>
    <packaging>war</packaging>

    <properties>
        <spring.version>5.1.9.RELEASE</spring.version>
        <dubbo.version>2.7.4.1</dubbo.version>
        <zookeeper.version>2.11.0</zookeeper.version>
    </properties>

    <dependencies>
        <!-- servlet3.0规范的坐标 -->
        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>javax.servlet-api</artifactId>
            <version>3.1.0</version>
            <scope>provided</scope>
        </dependency>
        <!--spring的坐标-->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-context</artifactId>
            <version>${spring.version}</version>
        </dependency>
        <!--springmvc的坐标-->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-webmvc</artifactId>
            <version>${spring.version}</version>
        </dependency>

        <!--日志-->
        <dependency>
            <groupId>org.slf4j</groupId>
            <artifactId>slf4j-api</artifactId>
            <version>1.7.16</version>
        </dependency>
        <dependency>
            <groupId>org.slf4j</groupId>
            <artifactId>slf4j-log4j12</artifactId>
            <version>1.7.16</version>
        </dependency>

        <!--Dubbo的起步依赖，版本2.7之后统一为org.apache.dubbo -->
        <dependency>
            <groupId>org.apache.dubbo</groupId>
            <artifactId>dubbo</artifactId>
            <version>${dubbo.version}</version>
        </dependency>
      
        <dependency>
            <groupId>org.apache.zookeeper</groupId>
            <artifactId>zookeeper</artifactId>
            <version>3.4.12</version>
        </dependency>
        <dependency>
            <groupId>org.apache.curator</groupId>
            <artifactId>curator-framework</artifactId>
            <version>2.11.0</version>
        </dependency>
        <dependency>
            <groupId>org.apache.curator</groupId>
            <artifactId>curator-recipes</artifactId>
            <version>2.11.0</version>
        </dependency>

        <!--依赖service模块-->
        <dependency>
            <groupId>com.itheima</groupId>
            <artifactId>dubbo-service</artifactId>
            <version>1.0-SNAPSHOT</version>
        </dependency>

    </dependencies>

    <build>
        <plugins>
            <!--tomcat插件-->
            <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>

</project>

1.3.2、spring-mvc.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:dubbo="http://dubbo.apache.org/schema/dubbo"
       xmlns:mvc="http://www.springframework.org/schema/mvc"
       xmlns:context="http://www.springframework.org/schema/context"
       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://dubbo.apache.org/schema/dubbo http://dubbo.apache.org/schema/dubbo/dubbo.xsd http://www.springframework.org/schema/context https://www.springframework.org/schema/context/spring-context.xsd">

    <mvc:annotation-driven/>
    <context:component-scan base-package="com.itheima.controller"/>

</beans>

1.3.3、log4j.properties

同上

1.3.4、web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xmlns="http://java.sun.com/xml/ns/javaee"
         xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"
         version="2.5">

	<!-- spring -->
    <context-param>
        <param-name>contextConfigLocation</param-name>
        <param-value>classpath*:spring/applicationContext*.xml</param-value>
    </context-param>
    <listener>
        <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
    </listener>
		 
	<!-- Springmvc -->	 
    <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:spring/spring-mvc.xml</param-value>
        </init-param>
    </servlet>

    <servlet-mapping>
        <servlet-name>springmvc</servlet-name>
        <url-pattern>*.do</url-pattern>
    </servlet-mapping>

</web-app>

1.3.5、UserController

package com.itheima.controller;

import com.itheima.service.UserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

@RestController
@RequestMapping("/user")
public class UserController {

    @Autowired
    private UserService userService;

    @RequestMapping("/sayHello")
    public String sayHello(){
        return userService.sayHello();
    }

}

2、添加dubbo-interface模块

把service和web相同的接口抽取出来，创建一个maven模块，供service和web依赖

2.1、pom.xml

<?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>

    <groupId>com.itheima</groupId>
    <artifactId>dubbo-interface</artifactId>
    <version>1.0-SNAPSHOT</version>

</project>

<!-- install -->

2.2、创建接口UserService

package com.itheima.service;

public interface UserService {
    public String sayHello();
}

3、服务提供者

3.1、修改pom.xml

    <packaging>war</packaging>

    <!--依赖公共的接口模块-->
    <dependency>
        <groupId>com.itheima</groupId>
        <artifactId>dubbo-interface</artifactId>
        <version>1.0-SNAPSHOT</version>
    </dependency>

    <build>
        <plugins>
            <!--tomcat插件-->
            <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>

3.2、修改applicationContext.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:dubbo="http://dubbo.apache.org/schema/dubbo" xmlns:context="http://www.springframework.org/schema/context"
	   xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
        http://dubbo.apache.org/schema/dubbo http://dubbo.apache.org/schema/dubbo/dubbo.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd">

	<!--<context:component-scan base-package="com.itheima.service"/>-->

	<!--dubbo的配置-->
	<!--1、配置项目的名称-->
	<dubbo:application name="dubbo-service"/>
	<!--2、配置注册中心的地址-->
	<dubbo:registry address="zookeeper://192.168.111.100:2181"/>
	<!--3、配置dubbo的包扫描-->
	<dubbo:annotation package="com.itheima.service.impl"/>

</beans>

3.3、添加webapp包

<!--web.xml-->
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xmlns="http://java.sun.com/xml/ns/javaee"
         xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"
         version="2.5">

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

</web-app>

3.4、修改UserServiceImpl

package com.itheima.service.impl;

import com.itheima.service.UserService;
import org.apache.dubbo.config.annotation.Service;
//import org.springframework.stereotype.Service;

//@Service // 将该类的对象创建出来，放到Spring的IOC容器中
// 需要将这个类发布到dubbo，需要提供IP、端口、以及访问路径，dubbo会记录到zookeeper中
@Service // 将这个类提供的服务（方法）对外发布，将访问地址注册到注册中心中
public class UserServiceImpl implements UserService {
    @Override
    public String sayHello() {
        return "Hello Dubbo ~ ";
    }
}

4、服务消费者

4.1、pom文件中添加dubbo-interface依赖包

        <!--依赖公共的接口模块-->
        <dependency>
            <groupId>com.itheima</groupId>
            <artifactId>dubbo-interface</artifactId>
            <version>1.0-SNAPSHOT</version>
            <scope>compile</scope>
        </dependency>

4.2、修改spring-mvc.xml

  • dubbo配置中qos.port属性
<?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"
       xmlns:mvc="http://www.springframework.org/schema/mvc"
       xmlns:context="http://www.springframework.org/schema/context"
       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://dubbo.apache.org/schema/dubbo http://dubbo.apache.org/schema/dubbo/dubbo.xsd http://www.springframework.org/schema/context https://www.springframework.org/schema/context/spring-context.xsd">

    <mvc:annotation-driven/>
    <context:component-scan base-package="com.itheima.controller"/>

    <!--dubbo的配置-->
    <!--1、配置项目的名称-->
    <dubbo:application name="dubbo-web">
        <dubbo:parameter key="qos.port" value="33333"/>
    </dubbo:application>
    <!--2、配置注册中心的地址-->
    <dubbo:registry address="zookeeper://192.168.111.100:2181"/>
    <!--3、配置dubbo的包扫描-->
    <dubbo:annotation package="com.itheima.controller"/>

</beans>

4.3、web-xml中删除spring配置

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xmlns="http://java.sun.com/xml/ns/javaee"
         xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"
         version="2.5">

	<!-- spring -->
    <!--<context-param>-->
        <!--<param-name>contextConfigLocation</param-name>-->
        <!--<param-value>classpath*:spring/applicationContext*.xml</param-value>-->
    <!--</context-param>-->
    <!--<listener>-->
        <!--<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>-->
    <!--</listener>-->
		 
	<!-- Springmvc -->	 
    <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:spring/spring-mvc.xml</param-value>
        </init-param>
    </servlet>

    <servlet-mapping>
        <servlet-name>springmvc</servlet-name>
        <url-pattern>*.do</url-pattern>
    </servlet-mapping>

</web-app>

4.4、修改UserController

package com.itheima.controller;

import com.itheima.service.UserService;
import org.apache.dubbo.config.annotation.Reference;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

@RestController
@RequestMapping("/user")
public class UserController {

    // @Autowired // 本地注入，有没有bean啊，现在没有bean了，不再需要

    /*
        远程注入
        1、从zookeeper注册中心获取userService的访问url
        2、进行远程调用RPC
        3、将结果封装为一个代理对象，给变量赋值
     */
    @Reference
    private UserService userService;

    @RequestMapping("/sayHello")
    public String sayHello() {
        return userService.sayHello();
    }

}

5、注意别忘了启动zookeeper

 类似资料：

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