【微服务架构】-Dubbo生态-Dubbo之Spring XML配置

其他 2020-04-23 14:26:02 阅读次数: 0

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背景

随着互联网的发展，网站应用的规模不断扩大，常规的垂直应用架构已无法应对，分布式服务架构以及流动计算架构势在必行，亟需一个治理系统确保架构有条不紊的演进。

单一应用架构

当网站流量很小时，只需一个应用，将所有功能都部署在一起，以减少部署节点和成本。此时，用于简化增删改查工作量的数据访问框架(ORM)是关键。

垂直应用架构

当访问量逐渐增大，单一应用增加机器带来的加速度越来越小，将应用拆成互不相干的几个应用，以提升效率。此时，用于加速前端页面开发的Web框架(MVC)是关键。

分布式服务架构

当垂直应用越来越多，应用之间交互不可避免，将核心业务抽取出来，作为独立的服务，逐渐形成稳定的服务中心，使前端应用能更快速的响应多变的市场需求。此时，用于提高业务复用及整合的分布式服务框架(RPC)是关键。

流动计算架构

当服务越来越多，容量的评估，小服务资源的浪费等问题逐渐显现，此时需增加一个调度中心基于访问压力实时管理集群容量，提高集群利用率。此时，用于提高机器利用率的资源调度和治理中心(SOA)是关键。

Dubbo概念

Dubbo 属于** 分布式服务架构**中的技术实现：
是一款高性能、轻量级的开源Java RPC框架，它提供了三大核心能力：面向接口的远程方法调用，智能容错和负载均衡，以及服务自动注册和发现。 它的特性如下 面向接口代理的高性能RPC调用 智能负载均衡 服务自动注册与发现 高度可扩展能力 运行期流量调度 可视化的服务治理与运维

Dubbo整合Spring XML配置

搭建一个Dubbo项目流程

创建三个项目

dubbo整合spring-xml版项目结构

创建maven父工程 dubbo-spring-xml

pom.xml配置
<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.dk</groupId>
   <artifactId>dubbo-spring-xml</artifactId>
   <version>0.0.1-SNAPSHOT</version>
   <packaging>pom</packaging>
   <modules>
      <module>dubbo-spring-xml-provider</module>
      <module>dubbo-spring-xml-customer</module>
      <module>dubbo-spring-xml-api</module>
   </modules>
   <properties>
      <!-- Generic properties -->
      <java.version>1.7</java.version>
      <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
      <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
      <!-- Web -->
      <jsp.version>2.2</jsp.version>
      <jstl.version>1.2</jstl.version>
      <servlet.version>3.1.0</servlet.version>
      <!-- Spring -->
      <spring-framework.version>4.3.10.RELEASE</spring-framework.version>
      <!-- Logging -->
      <logback.version>1.0.13</logback.version>
      <slf4j.version>1.7.5</slf4j.version>
   </properties>
   <dependencyManagement>
      <dependencies>
         <dependency>
            <groupId>javax</groupId>
            <artifactId>javaee-web-api</artifactId>
            <version>7.0</version>
            <scope>provided</scope>
         </dependency>

         <!-- Spring MVC -->
         <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-webmvc</artifactId>
            <version>${spring-framework.version}</version>
         </dependency>

         <!-- 其他web依赖 -->
         <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>jstl</artifactId>
            <version>${jstl.version}</version>
         </dependency>

         <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>javax.servlet-api</artifactId>
            <version>${servlet.version}</version>
            <scope>provided</scope>
         </dependency>

         <dependency>
            <groupId>javax.servlet.jsp</groupId>
            <artifactId>jsp-api</artifactId>
            <version>${jsp.version}</version>
            <scope>provided</scope>
         </dependency>

         <!-- Spring and Transactions -->
         <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-tx</artifactId>
            <version>${spring-framework.version}</version>
         </dependency>

         <!-- 使用SLF4J和LogBack作为日志 -->
         <dependency>
            <groupId>org.slf4j</groupId>
            <artifactId>slf4j-api</artifactId>
            <version>${slf4j.version}</version>
         </dependency>
         <dependency>
            <groupId>log4j</groupId>
            <artifactId>log4j</artifactId>
            <version>1.2.16</version>
         </dependency>
         <dependency>
            <groupId>org.slf4j</groupId>
            <artifactId>jcl-over-slf4j</artifactId>
            <version>${slf4j.version}</version>
         </dependency>
         <dependency>
            <groupId>ch.qos.logback</groupId>
            <artifactId>logback-classic</artifactId>
            <version>${logback.version}</version>
         </dependency>
         <dependency>
            <groupId>ch.qos.logback</groupId>
            <artifactId>logback-core</artifactId>
            <version>${logback.version}</version>
         </dependency>
         <dependency>
            <groupId>ch.qos.logback</groupId>
            <artifactId>logback-access</artifactId>
            <version>${logback.version}</version>
         </dependency>

         <!--对json和xml格式的支持 -->
         <!-- <dependency> <groupId>com.fasterxml.jackson.dataformat</groupId> 
            <artifactId>jackson-dataformat-xml</artifactId> <version>2.5.3</version> 
            </dependency> -->
         <!--配置springmvc信息转化为json所需的json包 -->
         <dependency>
            <groupId>com.fasterxml.jackson.core</groupId>
            <artifactId>jackson-databind</artifactId>
            <version>2.8.6</version>
         </dependency>
         <dependency>
            <groupId>com.fasterxml.jackson.core</groupId>
            <artifactId>jackson-databind</artifactId>
            <version>2.8.6</version>
         </dependency>
         <dependency>
            <groupId>com.fasterxml.jackson.core</groupId>
            <artifactId>jackson-annotations</artifactId>
            <version>2.8.6</version>
         </dependency>
         <dependency>
            <groupId>com.fasterxml.jackson.core</groupId>
            <artifactId>jackson-core</artifactId>
            <version>2.8.6</version>
         </dependency>

         <!-- 非必需，可简化IO操作 -->
         <dependency>
            <groupId>commons-io</groupId>
            <artifactId>commons-io</artifactId>
            <version>2.3</version>
         </dependency>
         <dependency>
            <groupId>org.apache.commons</groupId>
            <artifactId>commons-lang3</artifactId>
            <version>3.2</version>
         </dependency>
         <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-test</artifactId>
            <version>${spring-framework.version}</version>
            <scope>test</scope>
         </dependency>
         <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-jdbc</artifactId>
            <version>${spring-framework.version}</version>
            <scope>test</scope>
         </dependency>

         <dependency>
            <groupId>org.aspectj</groupId>
            <artifactId>aspectjrt</artifactId>
            <version>1.8.6</version>
         </dependency>
         <!--aspectj依赖 -->
         <dependency>
            <groupId>org.aspectj</groupId>
            <artifactId>aspectjtools</artifactId>
            <version>1.8.9</version>
         </dependency>
         <dependency>
            <groupId>org.aspectj</groupId>
            <artifactId>aspectjweaver</artifactId>
            <version>1.7.4</version>
         </dependency>

         <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.11</version>
            <scope>test</scope>
         </dependency>

         <!--dubbo -->
         <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>dubbo</artifactId>
            <version>2.5.8</version>
         </dependency>
         <!--redis -->
         <dependency>
            <groupId>redis.clients</groupId>
            <artifactId>jedis</artifactId>
            <version>2.9.0</version>
         </dependency>
         <dependency>
            <groupId>commons-fileupload</groupId>
            <artifactId>commons-fileupload</artifactId>
            <version>1.3.2</version>
         </dependency>
      </dependencies>
   </dependencyManagement>
   
   <build>
        <plugins>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-compiler-plugin</artifactId>
                <configuration>
                    <source>${java.version}</source>
                    <target>${java.version}</target>
                    <encoding>UTF-8</encoding>
                </configuration>
            </plugin>
        </plugins>
   </build>
</project>

创建API接口工程 dubbo-spring-xml-api

对外暴露RPC接口模块

POM.XML
<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>
  <parent>
    <groupId>org.dk</groupId>
    <artifactId>dubbo-spring-xml</artifactId>
    <version>0.0.1-SNAPSHOT</version>
  </parent>
  <artifactId>dubbo-spring-xml-api</artifactId>
   <build>
        <plugins>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-compiler-plugin</artifactId>
                <configuration>
                    <source>1.8</source>
                    <target>1.8</target>
                    <encoding>UTF-8</encoding>
                </configuration>
            </plugin>
        </plugins>
   </build>
</project>
实体Bean配置
public class DefaultBean {
   private String str;
   private String methodName;
   private long timestamp;

   public String getStr() {
      return str;
   }

   public void setStr(String str) {
      this.str = str;
   }

   public String getMethodName() {
      return methodName;
   }

   public void setMethodName(String methodName) {
      this.methodName = methodName;
   }

   public long getTimestamp() {
      return timestamp;
   }
   public void setTimestamp(long timestamp) {
      this.timestamp = timestamp;
   }
   @Override
   public String toString() {
      return "DefaultBean [str=" + str + ", methodName=" + methodName + ", timestamp=" + timestamp + "]";
   }
}
业务逻辑层Service
public interface DefaultApiService {
   /**
    * 默认方法
    * @param str
    * @return
    */
   String defaultMethod(String str);
}

创建服务提供者组件 dubbo-spring-xml-provider

需要将dubbo-spring-xml-api 依赖引入dubbo-spring-xml-provider中。

pom.xml
<dependencies>
   <dependency>
      <groupId>javax</groupId>
      <artifactId>javaee-web-api</artifactId>
      <scope>provided</scope>
   </dependency>

   <!-- Spring MVC -->
   <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-webmvc</artifactId>
   </dependency>

   <!-- 其他web依赖 -->
   <dependency>
      <groupId>javax.servlet</groupId>
      <artifactId>jstl</artifactId>
   </dependency>

   <dependency>
      <groupId>javax.servlet</groupId>
      <artifactId>javax.servlet-api</artifactId>
      <scope>provided</scope>
   </dependency>

   <dependency>
      <groupId>javax.servlet.jsp</groupId>
      <artifactId>jsp-api</artifactId>
      <scope>provided</scope>
   </dependency>

   <!-- Spring and Transactions -->
   <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-tx</artifactId>
   </dependency>

   <!-- 使用SLF4J和LogBack作为日志 -->
   <dependency>
      <groupId>org.slf4j</groupId>
      <artifactId>slf4j-api</artifactId>
   </dependency>
   <dependency>
      <groupId>log4j</groupId>
      <artifactId>log4j</artifactId>
   </dependency>
   <dependency>
      <groupId>org.slf4j</groupId>
      <artifactId>jcl-over-slf4j</artifactId>
   </dependency>
   <dependency>
      <groupId>ch.qos.logback</groupId>
      <artifactId>logback-classic</artifactId>
   </dependency>
   <dependency>
      <groupId>ch.qos.logback</groupId>
      <artifactId>logback-core</artifactId>
   </dependency>
   <dependency>
      <groupId>ch.qos.logback</groupId>
      <artifactId>logback-access</artifactId>
   </dependency>

   <!--对json和xml格式的支持 -->
   <!-- <dependency> <groupId>com.fasterxml.jackson.dataformat</groupId> <artifactId>jackson-dataformat-xml</artifactId> 
      <version>2.5.3</version> </dependency> -->
   <!--配置springmvc信息转化为json所需的json包 -->
   <dependency>
      <groupId>com.fasterxml.jackson.core</groupId>
      <artifactId>jackson-databind</artifactId>
   </dependency>
   <dependency>
      <groupId>com.fasterxml.jackson.core</groupId>
      <artifactId>jackson-databind</artifactId>
   </dependency>
   <dependency>
      <groupId>com.fasterxml.jackson.core</groupId>
      <artifactId>jackson-annotations</artifactId>
   </dependency>
   <dependency>
      <groupId>com.fasterxml.jackson.core</groupId>
      <artifactId>jackson-core</artifactId>
   </dependency>

   <!-- 非必需，可简化IO操作 -->
   <dependency>
      <groupId>commons-io</groupId>
      <artifactId>commons-io</artifactId>
   </dependency>

   <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-test</artifactId>
      <scope>test</scope>
   </dependency>
   <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-jdbc</artifactId>
      <scope>test</scope>
   </dependency>

   <dependency>
      <groupId>org.aspectj</groupId>
      <artifactId>aspectjrt</artifactId>
   </dependency>
   <!--aspectj依赖 -->
   <dependency>
      <groupId>org.aspectj</groupId>
      <artifactId>aspectjtools</artifactId>
   </dependency>
   <dependency>
      <groupId>org.aspectj</groupId>
      <artifactId>aspectjweaver</artifactId>
   </dependency>

   <dependency>
      <groupId>junit</groupId>
      <artifactId>junit</artifactId>
      <scope>test</scope>
   </dependency>

   <!--dubbo -->
   <dependency>
      <groupId>com.alibaba</groupId>
      <artifactId>dubbo</artifactId>
   </dependency>
   <!--redis -->
   <dependency>
      <groupId>redis.clients</groupId>
      <artifactId>jedis</artifactId>
   </dependency>

   <dependency>
      <groupId>org.niugang</groupId>
      <artifactId>dubbo-spring-xml-api</artifactId>
      <version>0.0.1-SNAPSHOT</version>
   </dependency>
</dependencies>

<build>
   <plugins>
      <plugin>
         <groupId>org.apache.maven.plugins</groupId>
         <artifactId>maven-compiler-plugin</artifactId>
         <version>2.3.2</version>
         <configuration>
            <source>${java.version}</source>
            <target>${java.version}</target>
         </configuration>
      </plugin>
      <plugin>
         <groupId>org.apache.maven.plugins</groupId>
         <artifactId>maven-war-plugin</artifactId>
         <version>2.3</version>
         <configuration>
            <failOnMissingWebXml>false</failOnMissingWebXml>
         </configuration>
      </plugin>
   </plugins>
</build>
编写 service对外暴露接口实现类
public class DefaultServiceImpl implements DefaultApiService {

   //模拟数据
   public static List<DefaultBean> list = new ArrayList<DefaultBean>();
   static {

      DefaultBean defaultBean = new DefaultBean();
      defaultBean.setStr("1");
      defaultBean.setMethodName("defaultMethod");
      defaultBean.setTimestamp(System.currentTimeMillis());
      list.add(defaultBean);
      DefaultBean defaultBean2 = new DefaultBean();
      defaultBean2.setStr("2");
      defaultBean2.setMethodName("defaultMethod2");
      defaultBean2.setTimestamp(System.currentTimeMillis());
      list.add(defaultBean2);
      DefaultBean defaultBean3 = new DefaultBean();
      defaultBean3.setStr("3");
      defaultBean3.setMethodName("defaultMethod3");
      defaultBean3.setTimestamp(System.currentTimeMillis());
      list.add(defaultBean);
      DefaultBean defaultBean4 = new DefaultBean();
      defaultBean4.setStr("4");
      defaultBean4.setMethodName("defaultMethod4");
      defaultBean4.setTimestamp(System.currentTimeMillis());
      list.add(defaultBean4);
      DefaultBean defaultBean5 = new DefaultBean();
      defaultBean5.setStr("5");
      defaultBean5.setMethodName("defaultMethod5");
      defaultBean5.setTimestamp(System.currentTimeMillis());
      list.add(defaultBean5);
   }

   @Override
   public String defaultMethod(String str) {
      Random random = new Random();
      int nextInt = random.nextInt(6);
      String res = null;
      if (nextInt > 0) {
         DefaultBean defaultBean = list.get(nextInt - 1);
         res = defaultBean.getStr() + "#" + defaultBean.getMethodName() + "#" + defaultBean.getTimestamp()
               + "if-defaultMethod：" + str + "^^^^^^^^^^^^";
      } else {
         DefaultBean defaultBean = list.get(nextInt);
         res = defaultBean.getStr() + "#" + defaultBean.getMethodName() + "#" + defaultBean.getTimestamp()
               + "else-defaultMethod：" + str + "^^^^^^^^^^^^";
      }
      return res;
   }
application.xml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:p="http://www.springframework.org/schema/p"
   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
   http://www.springframework.org/schema/context/spring-context.xsd
   http://www.springframework.org/schema/mvc
   http://www.springframework.org/schema/mvc/spring-mvc.xsd">

   <import resource="provider.xml" />
   
   <!--組件扫描 -->
   <context:component-scan base-package="org.niugang" />
   
   <!--注解扫描 -->
   <mvc:annotation-driven />
   
</beans>
dubbo服务端provider.xml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://code.alibabatech.com/schema/dubbo"
   xsi:schemaLocation="http://www.springframework.org/schema/beans 
   http://www.springframework.org/schema/beans/spring-beans.xsd 
     http://code.alibabatech.com/schema/dubbo
    http://code.alibabatech.com/schema/dubbo/dubbo.xsd">

   <!-- http://dubbo.apache.org/schema/dubbo/dubbo.xsd 上面配置为这个一直报错，改为 http://code.alibabatech.com/schema/dubbo/dubbo.xsd -->

   <!--用于配置当前应用信息，不管该应用是提供者还是消费者 -->
   <dubbo:application name="hello-world-app" />

   <!-- 用于配置连接注册中心相关信息 -->
   <dubbo:registry address="redis://localhost:6379"
      timeout="30000">
      <!--配置redis连接参数 -->
      <!--具体参数配置见com.alibaba.dubbo.registry.redis.RedisRegistry.class -->
      <dubbo:parameter key="max.idle" value="10" />
      <dubbo:parameter key="min.idle" value="5" />
      <dubbo:parameter key="max.active" value="20" />
      <dubbo:parameter key="max.total" value="100" />
   </dubbo:registry>

   <!-- 用于配置提供服务的协议信息，协议由提供方指定，消费方被动接受 -->
   <dubbo:protocol name="dubbo" port="20880" accesslog="true" />

   <!-- 实现类 -->
   <bean id="defaultService" class="org.niugang.service.DefaultServiceImpl" />
   <!--用于暴露一个服务，定义服务的元信息，一个服务可以用多个协议暴露，一个服务也可以注册到多个注册中心 -->
   <!--每个接口都应定义版本号，为后续不兼容升级提供可能 -->
   <!--ref：服务的真正实现类 -->
   <dubbo:service interface="org.niugang.service.DefaultApiService"
      ref="defaultService" version="1.0.0" />

   <!--监控中心配置 监控中心协议，如果为protocol="registry"，表示从注册中心发现监控中心地址，否则直连监控中心。 -->
   <dubbo:monitor protocol="registry"></dubbo:monitor>
   <!-- 直连监控中心服务器地址 -->
   <!-- <dubbo:monitor address="localhost:6379"></dubbo:monitor> -->
</beans>
web.xml
<?xml version="1.0" encoding="UTF-8"?>
<web-app id="WebApp_ID" version="2.4"
   xmlns="http://java.sun.com/xml/ns/j2ee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
   xsi:schemaLocation="http://java.sun.com/xml/ns/j2eehttp://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd">
   <!-- 上下文配置文件位置 -->
   <context-param>
      <param-name>contextConfigLocation</param-name>
      <!-- spring 配置文件所在位置，启动 spring 时会去该路径下查找该配置文件 -->
      <param-value>classpath:applicationContext.xml</param-value>
   </context-param>
   <!-- spring 上下文监听器，初始化启动容器时启动 spring -->
   <listener>
      <listener-class>org.springframework.web.context.ContextLoaderListener
      </listener-class>
   </listener>
   <!-- spring 核心转发器，拦截指定目录下的请求，分配到配置的拦截路径下处理 -->
   <servlet>
      <servlet-name>dispatcher</servlet-name>
      <servlet-class>org.springframework.web.servlet.DispatcherServlet
      </servlet-class>
      <init-param>
         <param-name>contextConfigLocation</param-name>
         <param-value>classpath:applicationContext.xml</param-value>
      </init-param>
      <load-on-startup>1</load-on-startup>
   </servlet>
   <servlet-mapping>
      <servlet-name>dispatcher</servlet-name>
      <url-pattern>/</url-pattern>
   </servlet-mapping>
   <!-- spring 编码过滤器 -->
   <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>forceEncoding</param-name>
         <param-value>true</param-value>
      </init-param>
   </filter>
   <!-- 编码过滤器过滤的路径 -->
   <filter-mapping>
      <filter-name>characterEncodingFilter</filter-name>
      <url-pattern>/*</url-pattern>
   </filter-mapping>
</web-app>

创建服务消费者 dubbo-spring-xml-customer

需要引入dubbo-spring-xml-api依赖

pom.xml
<dependencies>
   <dependency>
      <groupId>junit</groupId>
      <artifactId>junit</artifactId>
      <scope>test</scope>
   </dependency>
   <dependency>
      <groupId>javax</groupId>
      <artifactId>javaee-web-api</artifactId>
      <scope>provided</scope>
   </dependency>

   <!-- Spring MVC -->
   <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-webmvc</artifactId>
   </dependency>

   <!-- 其他web依赖 -->
   <dependency>
      <groupId>javax.servlet</groupId>
      <artifactId>jstl</artifactId>
   </dependency>

   <dependency>
      <groupId>javax.servlet</groupId>
      <artifactId>javax.servlet-api</artifactId>
      <scope>provided</scope>
   </dependency>

   <dependency>
      <groupId>javax.servlet.jsp</groupId>
      <artifactId>jsp-api</artifactId>
      <scope>provided</scope>
   </dependency>

   <!-- Spring and Transactions -->
   <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-tx</artifactId>
   </dependency>

   <!-- 使用SLF4J和LogBack作为日志 -->
   <dependency>
      <groupId>org.slf4j</groupId>
      <artifactId>slf4j-api</artifactId>
   </dependency>
   <dependency>
      <groupId>log4j</groupId>
      <artifactId>log4j</artifactId>
   </dependency>
   <dependency>
      <groupId>org.slf4j</groupId>
      <artifactId>jcl-over-slf4j</artifactId>
   </dependency>
   <dependency>
      <groupId>ch.qos.logback</groupId>
      <artifactId>logback-classic</artifactId>
   </dependency>
   <dependency>
      <groupId>ch.qos.logback</groupId>
      <artifactId>logback-core</artifactId>
   </dependency>
   <dependency>
      <groupId>ch.qos.logback</groupId>
      <artifactId>logback-access</artifactId>
   </dependency>

   <!--对json和xml格式的支持 -->
   <!-- <dependency> <groupId>com.fasterxml.jackson.dataformat</groupId> <artifactId>jackson-dataformat-xml</artifactId> 
      <version>2.5.3</version> </dependency> -->
   <!--配置springmvc信息转化为json所需的json包 -->
   <dependency>
      <groupId>com.fasterxml.jackson.core</groupId>
      <artifactId>jackson-databind</artifactId>
   </dependency>
   <dependency>
      <groupId>com.fasterxml.jackson.core</groupId>
      <artifactId>jackson-databind</artifactId>
   </dependency>
   <dependency>
      <groupId>com.fasterxml.jackson.core</groupId>
      <artifactId>jackson-annotations</artifactId>
   </dependency>
   <dependency>
      <groupId>com.fasterxml.jackson.core</groupId>
      <artifactId>jackson-core</artifactId>
   </dependency>

   <!-- 非必需，可简化IO操作 -->
   <dependency>
      <groupId>commons-io</groupId>
      <artifactId>commons-io</artifactId>
   </dependency>

   <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-test</artifactId>
      <scope>test</scope>
   </dependency>
   <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-jdbc</artifactId>
      <scope>test</scope>
   </dependency>

   <dependency>
      <groupId>org.aspectj</groupId>
      <artifactId>aspectjrt</artifactId>
   </dependency>
   <!--aspectj依赖 -->
   <dependency>
      <groupId>org.aspectj</groupId>
      <artifactId>aspectjtools</artifactId>
   </dependency>
   <dependency>
      <groupId>org.aspectj</groupId>
      <artifactId>aspectjweaver</artifactId>
   </dependency>
   <!--dubbo -->
   <dependency>
      <groupId>com.alibaba</groupId>
      <artifactId>dubbo</artifactId>
   </dependency>
   <!--redis -->
   <dependency>
      <groupId>redis.clients</groupId>
      <artifactId>jedis</artifactId>
   </dependency>
   <!--引入服务提供者 rpc接口 -->
   <dependency>
      <groupId>org.niugang</groupId>
      <artifactId>dubbo-spring-xml-api</artifactId>
      <version>0.0.1-SNAPSHOT</version>
   </dependency>
   <dependency>
      <groupId>org.apache.commons</groupId>
      <artifactId>commons-lang3</artifactId>
   </dependency>
   <dependency>
      <groupId>commons-fileupload</groupId>
      <artifactId>commons-fileupload</artifactId>
   </dependency>
</dependencies>

<build>
   <plugins>
      <plugin>
         <groupId>org.apache.maven.plugins</groupId>
         <artifactId>maven-compiler-plugin</artifactId>
         <version>2.3.2</version>
         <configuration>
            <source>${java.version}</source>
            <target>${java.version}</target>
         </configuration>
      </plugin>
      <plugin>
         <groupId>org.apache.maven.plugins</groupId>
         <artifactId>maven-war-plugin</artifactId>
         <version>2.3</version>
         <configuration>
            <failOnMissingWebXml>false</failOnMissingWebXml>
         </configuration>
      </plugin>
   </plugins>
   <finalName>dubbo-spring-xml-customer</finalName>
</build>
编写服务消费者 调用服务
@RestController
public class DemoConsumerController {
   /**
    * 引入服务提供者
    */
   @Autowired
   private DefaultApiService defaultService;
   @RequestMapping("/sayHello")
   public String sayHello(@RequestParam String name) {
      return defaultService.defaultMethod(name);
   }
}
服务消费者配置 applicationContentxt.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:p="http://www.springframework.org/schema/p"
   xmlns:context="http://www.springframework.org/schema/context"
   xmlns:mvc="http://www.springframework.org/schema/mvc"
      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://www.springframework.org/schema/context
   http://www.springframework.org/schema/context/spring-context.xsd
   http://www.springframework.org/schema/mvc
   http://www.springframework.org/schema/mvc/spring-mvc.xsd">

   <import resource="classpath:consumer.xml" />
   <!--組件扫描 -->
   <context:component-scan base-package="org.niugang" />
   <!--注解扫描 -->
   <mvc:annotation-driven />
</beans>
服务消费者dubbo配置 customer.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://code.alibabatech.com/schema/dubbo"
   xsi:schemaLocation="http://www.springframework.org/schema/beans 
    http://www.springframework.org/schema/beans/spring-beans.xsd 
     http://code.alibabatech.com/schema/dubbo
    http://code.alibabatech.com/schema/dubbo/dubbo.xsd">
    
   <!-- 消费方应用名，用于计算依赖关系，不是匹配条件，不要与提供方一样 -->
   <dubbo:application name="hello-world-customer" />

   <dubbo:registry address="redis://localhost:6379"
      timeout="30000" check="false" />

   <!-- 生成远程服务代理，可以和本地bean一样使用demoService -->
   <!-- version 版本号必须和服务提供者版本号对应 -->
   <!--interface 引入服务提供者对外暴露的接口  -->
   <dubbo:reference id="defaultService" interface="org.niugang.service.DefaultApiService"  version="1.0.0"/>

   <!--监控中心配置 监控中心协议，如果为protocol="registry"，表示从注册中心发现监控中心地址，否则直连监控中心。 -->
   <dubbo:monitor protocol="registry"></dubbo:monitor>
   <!--关闭所有消费者启动时检查   -->
   <dubbo:consumer check="false"></dubbo:consumer>
</beans>
服务消费者 web.xml
<?xml version="1.0" encoding="UTF-8"?>
<web-app id="WebApp_ID" version="2.4"
   xmlns="http://java.sun.com/xml/ns/j2ee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
   xsi:schemaLocation="http://java.sun.com/xml/ns/j2eehttp://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd">
   <!-- 上下文配置文件位置 -->
   <context-param>
      <param-name>contextConfigLocation</param-name>
      <!-- spring 配置文件所在位置，启动 spring 时会去该路径下查找该配置文件 -->
      <param-value>classpath*:applicationContext.xml</param-value>
   </context-param>
   <!-- spring 上下文监听器，初始化启动容器时启动 spring -->
   <listener>
      <listener-class>org.springframework.web.context.ContextLoaderListener
      </listener-class>
   </listener>
   <!-- spring 核心转发器，拦截指定目录下的请求，分配到配置的拦截路径下处理 -->
   <servlet>
      <servlet-name>dispatcher</servlet-name>
      <servlet-class>org.springframework.web.servlet.DispatcherServlet
      </servlet-class>
      <init-param>
         <param-name>contextConfigLocation</param-name>
         <param-value>classpath*：applicationContext.xml</param-value>
      </init-param>
      <load-on-startup>1</load-on-startup>
   </servlet>
   <servlet-mapping>
      <servlet-name>dispatcher</servlet-name>
      <url-pattern>/</url-pattern>
   </servlet-mapping>
   <!-- spring 编码过滤器 -->
   <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>forceEncoding</param-name>
         <param-value>true</param-value>
      </init-param>
   </filter>
   <!-- 编码过滤器过滤的路径 -->
   <filter-mapping>
      <filter-name>characterEncodingFilter</filter-name>
      <url-pattern>/</url-pattern>
   </filter-mapping>
</web-app>

运行测试

以上配置完成。将服务提供者，服务消费分别部署到不同的tomcat中。
启动服务提供者，启动服务消费者。
配置Tomcat后运行：

配置两个Tomcat-A 实例
Tomcat-C
运行后控制台输出
录入请求地址：http://localhost:8081/sayHello?name=dk
在这里插入图片描述

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