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Dubbo实践

目标

使用SSM+Dubbo实现数据查询。

服务接口模块

模块结构

设计原则

  1. 实体类必须实现Serializable接口。public class User implements Serializable。
  2. 书写接口方法，无需书写实现类。
public interface UserService {
    public List<User> queryUsers();
    public int addUser(User user);
}

3.配置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>org.example</groupId>
  <artifactId>dubbo-interface</artifactId>
  <version>1.0-SNAPSHOT</version>

</project>
  1. 将该模块打包成jar包。mvn dubbo-interface install

提供者模块

模块结构

设计步骤

1.配置pom.xml导入依赖

<dependencies>
    <dependency>
      <groupId>junit</groupId>
      <artifactId>junit</artifactId>
      <version>4.12</version>
      <scope>test</scope>
    </dependency>
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-context</artifactId>
      <version>5.2.5.RELEASE</version>
    </dependency>
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-webmvc</artifactId>
      <version>5.2.5.RELEASE</version>
    </dependency>
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-tx</artifactId>
      <version>5.2.5.RELEASE</version>
    </dependency>
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-jdbc</artifactId>
      <version>5.2.5.RELEASE</version>
    </dependency>
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-test</artifactId>
      <version>5.2.5.RELEASE</version>
    </dependency>
<!-- dubbo依赖-->
    <dependency>
      <groupId>com.alibaba</groupId>
      <artifactId>dubbo</artifactId>
      <version>2.6.2</version>
    </dependency>
<!-- zookeeper依赖-->
    <dependency>
      <groupId>org.apache.curator</groupId>
      <artifactId>curator-framework</artifactId>
      <version>4.1.0</version>
    </dependency>
<!-- 服务接口模型依赖-->
    <dependency>
      <groupId>org.example</groupId>
      <artifactId>dubbo-interface</artifactId>
      <version>1.0-SNAPSHOT</version>
    </dependency>
    <dependency>
      <groupId>org.mybatis</groupId>
      <artifactId>mybatis</artifactId>
      <version>3.5.6</version>
    </dependency>
    <dependency>
      <groupId>mysql</groupId>
      <artifactId>mysql-connector-java</artifactId>
      <version>8.0.23</version>
    </dependency>
    <dependency>
      <groupId>org.mybatis</groupId>
      <artifactId>mybatis-spring</artifactId>
      <version>2.0.6</version>
    </dependency>
    <dependency>
      <groupId>com.alibaba</groupId>
      <artifactId>druid</artifactId>
      <version>1.2.6</version>
    </dependency>
  </dependencies>

  <build>
    <resources>
      <resource>
        <directory>src/main/java</directory>
        <filtering>false</filtering>
        <includes>
          <include>**/*.properties</include>
          <include>**/*.xml</include>
        </includes>
      </resource>
    </resources>
  </build>

  1. 使用Mybatis+Spring配置接口实现类

  2. 配置文件详情（部分）
    spring配置文件：applicationContext.xml

<context:property-placeholder location="classpath:jdbc.properties" />
    <bean id="dataSource" class="com.alibaba.druid.pool.DruidDataSource">
        <property name="url" value="${jdbc.url}" />
        <property name="username" value="${jdbc.username}" />
        <property name="password" value="${jdbc.password}" />
    </bean>
    <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
        <property name="dataSource" ref="dataSource" />
        <property name="configLocation" value="classpath:mybatis.xml" />
    </bean>
    <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
        <property name="sqlSessionFactoryBeanName" value="sqlSessionFactory" />
        <property name="basePackage" value="com.hzc.dao" />
    </bean>
    <context:component-scan base-package="com.hzc" />

dubbo配置文件：dubbo-provider.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">
<!--    声明dubbo服务提供者：保证唯一性-->
    <dubbo:application name="dubbo-provider" />
<!--    声明dubbo使用的协议名称和端口号-->
    <dubbo:protocol name="dubbo" port="20880" />

<!--    采用直连方式
    <dubbo:protocol name="dubbo" port="20880" registry="N/A"/>
-->
<!--    使用zookeeper注册中心：
            指定注册中心地址和端口号
-->
    <dubbo:registry address="zookeeper://localhost:2181" />
<!--    加载接口实现类-->
<!--    <context:component-scan base-package="com.hzc.service" />-->
<!--暴露服务接口-->
    <dubbo:service interface="com.hzc.service.UserService" ref="userService"/>
</beans>

整合配置文件：spring-dubbo.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"
       xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd">
    <import resource="applicationContext.xml" />
    <import resource="dubbo-provider.xml" />
</beans>

4.配置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:applicationContext.xml,classpath:dubbo-provider.xml</param-value>-->
<!--    </context-param>-->
    <context-param>
        <param-name>contextConfigLocation</param-name>
        <param-value>classpath:spring-dubbo.xml</param-value>
    </context-param>
    <listener>
        <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
    </listener>
</web-app>

消费者模块

模块结构

设计步骤

  1. 配置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>org.example</groupId>
  <artifactId>dubbo-consumer</artifactId>
  <version>1.0-SNAPSHOT</version>
  <packaging>war</packaging>

  <name>dubbo-consumer Maven Webapp</name>
  <!-- FIXME change it to the project's website -->
  <url>http://www.example.com</url>

  <properties>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    <maven.compiler.source>1.8</maven.compiler.source>
    <maven.compiler.target>1.8</maven.compiler.target>
  </properties>

  <dependencies>
    <dependency>
      <groupId>junit</groupId>
      <artifactId>junit</artifactId>
      <version>4.12</version>
      <scope>test</scope>
    </dependency>
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-context</artifactId>
      <version>5.2.5.RELEASE</version>
    </dependency>
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-webmvc</artifactId>
      <version>5.2.5.RELEASE</version>
    </dependency>
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-tx</artifactId>
      <version>5.2.5.RELEASE</version>
    </dependency>
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-jdbc</artifactId>
      <version>5.2.5.RELEASE</version>
    </dependency>
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-test</artifactId>
      <version>5.2.5.RELEASE</version>
    </dependency>
    <dependency>
      <groupId>com.alibaba</groupId>
      <artifactId>dubbo</artifactId>
      <version>2.6.2</version>
    </dependency>
    <dependency>
      <groupId>org.apache.curator</groupId>
      <artifactId>curator-framework</artifactId>
      <version>4.1.0</version>
    </dependency>
    <dependency>
      <groupId>org.example</groupId>
      <artifactId>dubbo-interface</artifactId>
      <version>1.0-SNAPSHOT</version>
    </dependency>
    <dependency>
      <groupId>javax.servlet</groupId>
      <artifactId>javax.servlet-api</artifactId>
      <version>4.0.1</version>
    </dependency>
    <dependency>
      <groupId>javax.servlet</groupId>
      <artifactId>jsp-api</artifactId>
      <version>2.0</version>
    </dependency>
    <dependency>
      <groupId>com.fasterxml.jackson.core</groupId>
      <artifactId>jackson-core</artifactId>
      <version>2.12.0</version>
    </dependency>
    <dependency>
      <groupId>com.fasterxml.jackson.core</groupId>
      <artifactId>jackson-annotations</artifactId>
      <version>2.12.0</version>
    </dependency>
    <dependency>
      <groupId>com.fasterxml.jackson.core</groupId>
      <artifactId>jackson-databind</artifactId>
      <version>2.12.0</version>
    </dependency>
  </dependencies>
</project>

2.书写controller方法

@Controller
@RequestMapping("/user")
public class UserController {
    @Autowired
    private UserService userService;
    @RequestMapping("/queryUsers")
    @ResponseBody
    public List<User> queryUsers(){
        List<User> users = userService.queryUsers();
        users.forEach(u-> System.out.println(u));
        return users;
    }
}

3.配置文件详情（部分）

SpringMVC 配置文件：springmvc.xml

<context:component-scan base-package="com.hzc.controller" />
    <bean id="resourceViewResolver" class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <property name="suffix" value=".jsp" />
        <property name="prefix" value="/WEB-INF/jsp/" />
    </bean>
    <mvc:default-servlet-handler />
    <mvc:annotation-driven />

dubbo配置文件：dubbo-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: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">
<!--    声明dubbo服务消费者名称：保证唯一性-->
    <dubbo:application name="dubbo-consumer" />
<!--    指定注册中心-->
    <dubbo:registry address="zookeeper://localhost:2181" />
<!--    引用远程接口服务-->
    <dubbo:reference id="userService" interface="com.hzc.service.UserService" />
</beans>

整合配置文件：springmvc-dubbo.xml

<import resource="springmvc.xml" />
    <import resource="dubbo-consumer.xml" />

4.配置web.xml

<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:springmvc.xml,classpath:dubbo-consumer.xml</param-value>-->
<!--        </init-param>-->
        <init-param>
            <param-name>contextConfigLocation</param-name>
            <param-value>classpath:springmvc-dubbo.xml</param-value>
        </init-param>
        <load-on-startup>1</load-on-startup>
    </servlet>
    <servlet-mapping>
        <servlet-name>dispatcherServlet</servlet-name>
        <url-pattern>/</url-pattern>
    </servlet-mapping>
    <filter>
        <filter-name>characterEncodingFilter</filter-name>
        <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
        <init-param>
            <param-name>encoding</param-name>
            <param-value>utf-8</param-value>
        </init-param>
        <init-param>
            <param-name>forceRequestEncoding</param-name>
            <param-value>true</param-value>
        </init-param>
        <init-param>
            <param-name>forceResponseEncoding</param-name>
            <param-value>true</param-value>
        </init-param>
    </filter>
    <filter-mapping>
        <filter-name>characterEncodingFilter</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping>

5.界面设计

<%--
  Created by IntelliJ IDEA.
  User: HZC
  Date: 2021/8/24
  Time: 21:43
  To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<%
    String basePath = request.getScheme() + "://" +
            request.getServerName() + ":" + request.getServerPort() +
            request.getContextPath() + "/";
%>
<html>
<head>
    <title>Title</title>
</head>
<script src="js/jquery-3.4.1.min.js"></script>
<script>
    function query(){
        $.ajax({
            url:"user/queryUsers",
            dataType:"json",
            type:"post",
            success:function (data) {
                $.each(data,function (i,n) {
                    $(".info").append("<tr>")
                        .append("<td>"+n.name+"</td>")
                        .append("<td>"+n.age+"</td>")
                        .append("<td>"+n.phone+"</td>")
                        .append("</tr>")
                })
            }
        })
    }
    $(function () {
        query();
        $(".btn_query").click(function () {
            $(".info").html("");
            query();
        })
    })
</script>
<body>
    <div align="center">
        <table border="1">
            <thead>
                <tr>
                    <td>姓名</td>
                    <td>年龄</td>
                    <td>电话</td>
                </tr>
            </thead>
            <tbody class="info">

            </tbody>
        </table>
        <button class="btn_query">查询所有信息</button>
        <a href="<%=basePath%>/user/queryUsers">跳转</a>
    </div>
</body>
</html>
posted @ 2021-08-25 19:37  IamHzc  阅读(45)  评论(0)  编辑  收藏  举报