Springmvc整合dubbo+zookeeper，实现分布式系统之间的服务远程调用(即RPC服务)

Myth丶恋晨 2022-01-11 05:51 186阅读 0赞

## 项目环境： ##

*  IntelliJ IDEA
 *  tomcat8.5.38
 *  jdk1.8
 *  apache-zookeeper-3.5.5-bin.tar

## 一、安装zookeeper本地服务 ##

1.通过链接下载对应的包 [http://www.apache.org/dist/zookeeper/][http_www.apache.org_dist_zookeeper]  
选择：apache-zookeeper-3.5.5-bin.tar  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2ZhbmdjaGFvMjAxMQ_size_16_color_FFFFFF_t_70]  
2、解压后，conf里面，会看到zoo\_sample.cfg文件。将zoo\_sample.cfg改成bak文件（备份），并复制一个修改为zoo.cfg，修改相关配置内容，添加下面两行参数：  
dataDir=D:\\Sofeware\\apache-zookeeper-3.5.5-bin\\tmp  
dataLogDir=D:\\Sofeware\\apache-zookeeper-3.5.5-bin\\logs

**注意：如果后面启动出现闪退情况，有可能是因为8080端口被占用，需要修改下admin端口，添加参数（端口不重复就行）：admin.serverPort=8888**  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2ZhbmdjaGFvMjAxMQ_size_16_color_FFFFFF_t_70 1]  
3、修改好配置文件后，双击zkServer.cmd，如果出现闪退了，看是否是上面8080端口被占用的问题不（可以用文本编辑下zkServer.cmd，在倒数第二行加一个 pause，可以控制启动失败时不闪退）。  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2ZhbmdjaGFvMjAxMQ_size_16_color_FFFFFF_t_70 2]  
4、启动，显示下图则表示 zookeeper已经启动成功。  
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## 二、创建服务提供服务(provider) ##

0、项目结构图：  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2ZhbmdjaGFvMjAxMQ_size_16_color_FFFFFF_t_70 4]  
1、搭建springmvc项目环境

pom.xml:（相关maven包）

<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.test</groupId>
      <artifactId>dubbo-demo</artifactId>
      <version>0.0.1-SNAPSHOT</version>
      <packaging>pom</packaging>
    
      <name>dubbo-demo</name>
      <url>http://maven.apache.org</url>
    
      <properties>
        <motan.version>0.3.0</motan.version>
        
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <spring.version>5.1.2.RELEASE</spring.version>
        <jackson.version>2.9.7</jackson.version>
        <shiro.version>1.4.0</shiro.version>
        <junit>4.12</junit>
      </properties>
    
      <dependencies>
          <dependency>
          <groupId>junit</groupId>
          <artifactId>junit</artifactId>
          <version>3.8.1</version>
          <scope>test</scope>
        </dependency>
        
        
        <dependency>
        	<groupId>com.alibaba</groupId>
        	<artifactId>dubbo</artifactId>
        	<version>2.5.3</version>
        	<exclusions>
        		<exclusion>
        			<groupId>org.springframework</groupId>
        			<artifactId>spring</artifactId>
        		</exclusion>
        	</exclusions>
        </dependency>
        
        <dependency>
        	<groupId>com.github.sgroschupf</groupId>
        	<artifactId>zkclient</artifactId>
        	<version>0.1</version>
        </dependency>
        
        
        <dependency>
        	<groupId>org.springframework</groupId>
        	<artifactId>spring-context-support</artifactId>
        	<version>${spring.version}</version>
        </dependency>
    
        <dependency>
          <groupId>org.springframework</groupId>
          <artifactId>spring-webmvc</artifactId>
          <version>${spring.version}</version>
        </dependency>
    
          
          <dependency>
              <groupId>com.fasterxml.jackson.core</groupId>
              <artifactId>jackson-databind</artifactId>
              <version>${jackson.version}</version>
          </dependency>
          <dependency>
              <groupId>com.fasterxml.jackson.core</groupId>
              <artifactId>jackson-core</artifactId>
              <version>${jackson.version}</version>
          </dependency>
          <dependency>
              <groupId>com.fasterxml.jackson.core</groupId>
              <artifactId>jackson-annotations</artifactId>
              <version>${jackson.version}</version>
          </dependency>
    
        
        <dependency>
        	<groupId>org.aspectj</groupId>
        	<artifactId>aspectjrt</artifactId>
        	<version>1.6.11</version>
        </dependency>
        <dependency>
        	<groupId>org.aspectj</groupId>
        	<artifactId>aspectjweaver</artifactId>
        	<version>1.6.11</version>
        </dependency>
      </dependencies>
      
    </project>

applicationContext.xml：（扫描注解、引用服务配置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:mvc="http://www.springframework.org/schema/mvc" xmlns:context="http://www.springframework.org/schema/context" xmlns:tx="http://www.springframework.org/schema/tx" xmlns:aop="http://www.springframework.org/schema/aop" xmlns:cache="http://www.springframework.org/schema/cache" 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://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop.xsd http://www.springframework.org/schema/cache http://www.springframework.org/schema/cache/spring-cache.xsd">
    	
    	
    	<context:component-scan base-package="com.test" annotation-config="true">
    		<context:exclude-filter type="annotation" expression="org.springframework.stereotype.Controller" />
    	</context:component-scan>
    
        
    	<import resource="dubbo-provider.xml" />
    </beans>

springMVC-servlet.xml：（扫描controller，开启mvc注解）

<?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:mvc="http://www.springframework.org/schema/mvc" xmlns:context="http://www.springframework.org/schema/context" xmlns:tx="http://www.springframework.org/schema/tx" xmlns:aop="http://www.springframework.org/schema/aop" xmlns:p="http://www.springframework.org/schema/p" 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://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop.xsd">
    
    	
    	<context:component-scan base-package="com.test" use-default-filters="false">
    		<context:include-filter type="annotation" expression="org.springframework.stereotype.Controller" />
    	</context:component-scan>
    
    	
    	<mvc:annotation-driven>
    		<mvc:message-converters register-defaults="true">
    			
    			<bean class="org.springframework.http.converter.json.MappingJackson2HttpMessageConverter">
    				<property name="objectMapper">
    					<bean class="com.fasterxml.jackson.databind.ObjectMapper">
    						<property name="dateFormat">
    							<bean class="java.text.SimpleDateFormat">
    								<constructor-arg type="java.lang.String" value="yyyy-MM-dd HH:mm:ss" />
    							</bean>
    						</property>
    					</bean>
    				</property>
    				<property name="supportedMediaTypes">
    					<list>
    						<value>application/json;charset=utf-8</value>
    					</list>
    				</property>
    			</bean>
    			<bean class ="org.springframework.http.converter.StringHttpMessageConverter">
    				<property name ="supportedMediaTypes">
    					<list>
    						<value>text/plain;charset=UTF-8</value>
    					</list>
    				</property>
    			</bean>
    		</mvc:message-converters>
    	</mvc:annotation-driven>
    
    </beans>

dubbo-provider.xml：（配置对外的服务接口）

web.xml:（加载配置与监听）

<?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</param-value>
        </context-param>
    
        
        <filter>
            <description>字符集过滤器</description>
            <filter-name>encodingFilter</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>
        <filter-mapping>
            <filter-name>encodingFilter</filter-name>
            <url-pattern>/*</url-pattern>
        </filter-mapping>
    
        
        <servlet>
            <servlet-name>springMVC</servlet-name>
            <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
            <init-param>
                <param-name>contextConfigLocation</param-name>
                <param-value>classpath*:springMVC-servlet.xml</param-value>
            </init-param>
            <load-on-startup>1</load-on-startup>
        </servlet>
        <servlet-mapping>
            <servlet-name>springMVC</servlet-name>
            <url-pattern>/</url-pattern>
        </servlet-mapping>
    
        
        <listener>
            <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
        </listener>
    
        <listener>
            <listener-class>org.springframework.web.util.IntrospectorCleanupListener</listener-class>
        </listener>
    
        <listener>
            <listener-class>org.springframework.web.context.request.RequestContextListener</listener-class>
        </listener>
    </web-app>

2、编写对外的RPC服务接口  
DemoService:

package com.test.service;
    /** * 接口 */
    public interface DemoService { 
    
    	String getMessage(String name);
    }

DemoServiceImpl:

package com.test.service;
    
    import org.springframework.stereotype.Service;
    
    /** * 服务实现类 */
    @Service("demoService")
    public class DemoServiceImpl implements DemoService{ 
    
    	
    	public String getMessage(String name) { 
    		String msg = "hello "+name+" . i'm from provider !";
    		System.out.println(msg);
    		return msg;
    	}
    }

## 三、创建调用服务(customer) ##

0、项目结构：  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2ZhbmdjaGFvMjAxMQ_size_16_color_FFFFFF_t_70 5]  
customer项目架构与**provider**项目架构一致，复制一下。删除DemoServiceImpl实现类，我们要的效果是customer的项目调用到**provider**实现类的接口。

然后将dubbo-provider.xml服务配置修改成dubbo-consumer.xml

customer项目中写一个controller类来测试一下：  
rpcController：

package com.test.controller;
    
    import com.test.service.DemoService;
    import org.springframework.beans.factory.annotation.Autowired;
    import org.springframework.web.bind.annotation.RequestMapping;
    import org.springframework.web.bind.annotation.RestController;
    
    @RestController
    public class rpcController { 
    
        @Autowired
        private DemoService demoService;
    
        @RequestMapping("/getMessage")
        public String getName(){ 
            return demoService.getMessage("jack");
        }
    }

我们看到customer项目调用本项目的DemoService成功的访问到了provider项目的DemoServiceImpl内容。说明我们成功RPC服务调用成功了。  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2ZhbmdjaGFvMjAxMQ_size_16_color_FFFFFF_t_70 6]

## 总结 ##

#### 提供者与消费者模式： ####

我们也可以用maven的子模块模式把公共RPC服务接口单独用一个项目去实现，  
然后提供者与消费者去继承这个公共接口类就行了，这样更容易管理。**推荐**

也可以把提供者项目的接口打包，引入到消费者系统中使用，缺点：麻烦，经常需要手动。**不推荐**

也可以用两个独立的项目，提供者与消费者心目的接口路径与名称需要一致（文章就是采用的这种），优点：容易理解，缺点：改动时要同步手动。**不推荐**。

[http_www.apache.org_dist_zookeeper]: http://www.apache.org/dist/zookeeper/
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