空~

改造 dubbo 项目

空~2022年10月9日
  • Dubbo
大约 3 分钟

改造 dubbo 项目

抽象分散在多个项目中的公共接口，实体类，异常，工具类到一个项目中，在其他项目如服务提供者，消费者共用公共的资源。

抽取公共部分

公共部分

建立一个普通的 maven 项目, 放置实体类, 接口等.

link-orderservice-provider

maven 依赖

<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/maven-v4_0_0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <groupId>org.example</groupId>
    <artifactId>link-orderservice-provider</artifactId>
    <packaging>war</packaging>
    <version>1.0-SNAPSHOT</version>
    <dependencies>
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <version>1.18.24</version>
            <scope>compile</scope>
        </dependency>
    </dependencies>
</project>

实体类

@Data
public class User implements Serializable {
    private Integer id;
    private String  name;
    private String pwd;

    public User(Integer id, String name, String pwd) {
        this.id = id;
        this.name = name;
        this.pwd = pwd;
    }

    public User() {
    }
}

mapper

public class UserMapper {
    public User queryUser(Integer id) {
        return new User(id, "lisi", "111");
    }
}

接口

public interface UserService {

    User queryUserById(Integer id);
}

接口实现

link-orderserviceimpl-provider

maven 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 http://maven.apache.org/maven-v4_0_0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <groupId>org.example</groupId>
    <artifactId>link-orderserviceimpl-provider</artifactId>
    <version>1.0-SNAPSHOT</version>
    <packaging>war</packaging>
    <dependencies>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-webmvc</artifactId>
            <version>5.3.23</version>
        </dependency>
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>dubbo</artifactId>
            <version>2.6.2</version>
        </dependency>
        <dependency>
            <groupId>org.example</groupId>
            <artifactId>link-orderservice-provider</artifactId>
            <version>1.0-SNAPSHOT</version>
        </dependency>
    </dependencies>
</project>

实现类

public class UserServiceImpl implements UserService {
    private UserMapper userMapper = new UserMapper();

    @Override
    public User queryUserById(Integer id) {
        return userMapper.queryUser(id);
    }
}

dubbo 配置

<?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.xsd
       http://dubbo.apache.org/schema/dubbo
       http://dubbo.apache.org/schema/dubbo/dubbo.xsd">
    <!--
    服务提供者声明名称: 必须保证服务名称的唯一性, 它的名称是dubbo内部使用的唯一标识
    -->
    <dubbo:application name="link-orderserviceimpl-provider"/>

    <!--指定协议和端口-->
    <dubbo:protocol name="dubbo" port="20881"/>

    <!--暴露服务接口-->
    <dubbo:service interface="com.demo.service.UserService" ref="userService" registry="N/A"/>
    <!--实现服务接口-->
    <bean id="userService" class="com.demo.service.impl.UserServiceImpl"/>
</beans>

web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee"
	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_4_0.xsd"
	version="4.0">
	<context-param>
		<param-name>contextConfigLocation</param-name>
		<param-value>classpath:DubboProvideImplApplication.xml</param-value>
	</context-param>
	<listener>
		<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
	</listener>
</web-app>

访问层

link-main-web

maven 依赖

<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/maven-v4_0_0.xsd">
  <modelVersion>4.0.0</modelVersion>
  <groupId>org.example</groupId>
  <artifactId>link-main-web</artifactId>
  <packaging>war</packaging>
  <version>1.0-SNAPSHOT</version>
  <dependencies>
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-webmvc</artifactId>
      <version>5.3.23</version>
    </dependency>
    <dependency>
      <groupId>com.alibaba</groupId>
      <artifactId>dubbo</artifactId>
      <version>2.6.2</version>
    </dependency>
    <dependency>
      <groupId>org.example</groupId>
      <artifactId>link-orderservice-provider</artifactId>
      <version>1.0-SNAPSHOT</version>
    </dependency>
  </dependencies>
</project>

controller

@Controller
public class UserController {
    @Resource
    private UserService userService;

    @RequestMapping("/user")
    public String QueryUser(Model model, Integer id) {
        model.addAttribute("user", userService.queryUserById(id));
        return "index";
    }
}

dubbo 配置

<?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.xsd
       http://dubbo.apache.org/schema/dubbo
       http://dubbo.apache.org/schema/dubbo/dubbo.xsd">
    <!--
    服务消费者声明名称: 保证服务名称的唯一性
    -->
    <dubbo:application name="link-main-web"/>
    <!--
    引用远程服务接口:
    id: 远程服务接口对象名称
    interface: 调用远程接口的全限定类名
    url: 范围服务接口地址
    registry: 不使用注册中心, 值为: N/A
    -->
    <dubbo:reference id="userService"
                     interface="com.demo.service.UserService"
                     url="dubbo://localhost:20881"
                     registry="N/A"/>
</beans>

SpringApplication.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:context="http://www.springframework.org/schema/context"
       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/context
       https://www.springframework.org/schema/context/spring-context.xsd
       http://www.springframework.org/schema/mvc
       https://www.springframework.org/schema/mvc/spring-mvc.xsd">
    <!--组件扫描器-->
    <context:component-scan base-package="com.demo.controller"/>
    <!--注解驱动-->
    <mvc:annotation-driven/>
    <!--视图解析器-->
    <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <property name="prefix" value="/"/>
        <property name="suffix" value=".jsp"/>
    </bean>
</beans>

web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd"
         version="3.1">
    <servlet>
        <servlet-name>DispatcherServlet</servlet-name>
        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
        <init-param>
            <param-name>contextConfigLocation</param-name>
            <param-value>classpath:SpringApplication.xml,classpath:DubboLinkApplication.xml</param-value>
        </init-param>
    </servlet>

    <servlet-mapping>
        <servlet-name>DispatcherServlet</servlet-name>
        <url-pattern>/</url-pattern>
    </servlet-mapping>
</web-app>

jsp

<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<body>
<div>用户标识:${user.id}</div>
<div>用户名称:${user.name}</div>
</body>
</html>