HMdubbo4【dubbo快速入门】

  • 框架

image-20221008234303244

提供者和消费者理论上是两个项目，此处用同一项目中两个模块进行模拟

  • 实现步骤

    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 UserServiceImpl 提供服务

    ④在服务消费者中的 UserController 远程调用UserServiceImpl 提供的服务

    ⑤分别启动两个服务，测试

1 demo:spring+springMVC

1.1 创建项目&模块

创建一个空项目用于包裹代码

image-20221008234749122

image-20221008234846378

image-20221008235015639

image-20221008235255379

image-20221008235318306

image-20221008235349896

image-20221008235403730

同上，再新建一个dubbo-web模块

image-20221008235546988

image-20221009000109119

之前传统项目中，web和service是在同一个项目中的

现在将两者分成不同的模块，web依赖于service

web作为war，可以在tomcat中启动

service作为jar，仅提供服务

<?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.yppah</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>4.0.0</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>1.7.21</version>
        </dependency>
        <dependency>
            <groupId>org.slf4j</groupId>
            <artifactId>slf4j-log4j12</artifactId>
            <version>1.7.21</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>
    </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>

<?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.yppah</groupId>
    <artifactId>dubbo-service</artifactId>
    <version>1.0-SNAPSHOT</version>
    <packaging>jar</packaging> <!-- 默认jar，可省略 -->


    <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>
        <!-- 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>1.7.21</version>
        </dependency>
        <dependency>
            <groupId>org.slf4j</groupId>
            <artifactId>slf4j-log4j12</artifactId>
            <version>1.7.21</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>
    </dependencies>


</project>

1.2 dubbo-service模块

image-20221009001453857

package com.yppah.service;

/**
 * @Author: haifei
 * @Date: 2022/10/9 0:06
 */
public interface UserService {

    public String sayHello();
}


package com.yppah.service.impl;

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

/**
 * @Author: haifei
 * @Date: 2022/10/9 0:07
 */
@Service //bean
public class UserServiceImpl implements UserService {

    @Override
    public String sayHello() {
        return "hello dubbo!";
    }
}


<?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">

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

</beans>

# DEBUG < INFO < WARN < ERROR < FATAL
# Global logging configuration
log4j.rootLogger=info, 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

1.3 dubbo-web模块

image-20221009204208696

image-20221009002945710

<?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">

    <!--注解驱动打开-->
    <mvc:annotation-driven/>
    <!--扫包-->
    <context:component-scan base-package="com.yppah.controller"/>

</beans>

<?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>
        <!--需要在web模块的pom中添加对dubbo-service模块的依赖，不然上行报红-->
    </context-param>
    <!--spring监听器ContextLoaderListener-->
    <listener>
        <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
    </listener>


	<!-- springMVC -->
    <!--springMVC前端控制器DispatcherServlet-->
    <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/springmvc.xml</param-value>
        </init-param>
    </servlet>


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


</web-app>

package com.yppah.controller;

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

/**
 * @Author: haifei
 * @Date: 2022/10/9 0:30
 */
@RestController
@RequestMapping("/user")
public class UserController {

    @Autowired
    private UserService userService;

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

1.4 启动测试

  • 因为service模块被依赖了，所以先maven-install安装一下

image-20221009003649247

image-20221009003733331

  • 然后maven-tomcat启动web模块

image-20221009003814821

image-20221009204425604

image-20221009204436610

以上实现了本地调用

虽然拆分成了两个模块，但此时还属于单体应用架构，并没有实现分布式

分布式要求每个模块/项目都可以单独启动、独立对外提供服务；而显然此时service并不符合

image-20221009204814364

下面通过dubbo实现远程调用

改造为SOA架构/分布式架构

image-20221009205236010

2 服务提供者provider

image-20221009205450103

image-20221009205508629

image-20221009205631836

  • 将service模块改造为web项目，并配置dubbo

image-20221009211335868

package com.yppah.service.impl;

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

/**
 * @Author: haifei
 * @Date: 2022/10/9 0:07
 */
//@Service //定义bean：将该类的对象创建出来，放到spring的IOC容器中
@Service //将该类提供的方法(服务)对外发布，将访问地址(ip,端口,路径)注册到注册中心中(zk)
public class UserServiceImpl implements UserService {

    @Override
    public String sayHello() {
        return "hello dubbo!";
    }
}


<?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">

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

    <!--dubbo配置-->
    <!--1. 配置项目名称（唯一）-->
    <dubbo:application name="dubbo-service" />
    <!--2. 配置注册中心地址-->
    <dubbo:registry address="zookeeper://192.168.1.8:2181" />
    <!--3. 配置dubbo扫包-->
    <dubbo:annotation package="com.yppah.service.impl" />

</beans>

<?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>
        <!--需要在web模块的pom中添加对dubbo-service模块的依赖，不然上行报红-->
    </context-param>
    <!--spring监听器ContextLoaderListener-->
    <listener>
        <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
    </listener>


</web-app>

image-20221009211734374

image-20221009211449503

image-20221009211904749

3 服务消费者consumer

image-20221009223006351

image-20221009222633417

image-20221009222522885

image-20221009223352069

package com.yppah.controller;

//import com.yppah.service.UserService;
import com.yppah.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;

/**
 * @Author: haifei
 * @Date: 2022/10/9 0:30
 */
@RestController
@RequestMapping("/user")
public class UserController {

    //@Autowired//本地注入
    /*
        1. 从注册中心zk获取useService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，并给变量赋值
     */
    @Reference//远程注入
    private UserService userService;

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


package com.yppah.service;

/**
 * @Author: haifei
 * @Date: 2022/10/9 22:28
 */
public interface UserService {

    public String sayHello();
}


<?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">

    <!--注解驱动打开-->
    <mvc:annotation-driven/>
    <!--扫包-->
    <context:component-scan base-package="com.yppah.controller" />

    <!--dubbo配置-->
    <!--1. 配置项目名称（唯一）-->
    <dubbo:application name="dubbo-web" />
    <!--2. 配置注册中心地址-->
    <dubbo:registry address="zookeeper://192.168.1.8:2181" />
    <!--3. 配置dubbo扫包-->
    <dubbo:annotation package="com.yppah.controller" />

</beans>

image-20221009223534132

image-20221009223633582

访问测试

image-20221009223725110

报错如下

image-20221009224045957

原因如下

image-20221009224017324

解决如下

image-20221009224241822

重启web模块测试

image-20221009224344586

image-20221009224402570

ok

4 改造-抽取接口模块

新建模块dubbo-interface

image-20221009230423674

image-20221009224641122

image-20221009230621421

<?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.yppah</groupId>
    <artifactId>dubbo-interface</artifactId>
    <version>1.0-SNAPSHOT</version>


</project>

package com.yppah.service;

/**
 * @Author: haifei
 * @Date: 2022/10/9 0:06
 */
public interface UserService {

    public String sayHello();
}

image-20221009230733560

image-20221009230818294

image-20221009230956791

image-20221009231026663

image-20221009231225102

interface模块是依赖模块，先maven-install一下

然后依次maven-tomcat启动service和web模块

image-20221009231411087

image-20221009231458272

image-20221009231523893

image-20221009231649777

image-20221009231704334

image-20221009231724058

posted @   yub4by  阅读(25)  评论(0)  编辑  收藏  举报
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