项目加入dubbo,zookeeper实现服务调用

痛定思痛。 2022-03-20 15:06 222阅读 0赞

## 1、当前项目目录结构说明 ##

首先，项目为父子项目目录结构，mad-web和mad-other是两个不同的web应用，那么，用dubbo和zookeeper要实现的是，在mad-other项目中直接调用mad-web中提供的接口。  
而且，本机需要安装zookeeper，下篇写zookeeper和dubbo的安装。

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzIwNzQxMTMz_size_16_color_FFFFFF_t_70]

## 2、maven中加入相应jar包 ##

其中有个小坑，就是在dubbo包中，存在着spring低版本jar包，如果不加入exclusion排除它，默认会使用低版本spring，会影响项目启动。配置如下：

<dependency>
    			<groupId>com.alibaba</groupId>
    			<artifactId>dubbo</artifactId>
    			<version>2.5.3</version>
    			<exclusions>
    				<exclusion>
    					<groupId>org.springframework</groupId>
    					<artifactId>spring</artifactId>
    				</exclusion>
    				<exclusion>
    					<groupId>org.jboss.netty</groupId>
    					<artifactId>netty</artifactId>
    				</exclusion>
    			</exclusions>
    		</dependency>
    		<dependency>
    			<groupId>org.apache.zookeeper</groupId>
    			<artifactId>zookeeper</artifactId>
    			<version>3.4.13</version>
    		</dependency>
    		<dependency>
    			<groupId>com.github.sgroschupf</groupId>
    			<artifactId>zkclient</artifactId>
    			<version>0.1</version>
    		</dependency>

## 3、mad-web服务端配置相关 ##

（1）web.xml，在原来的基础上添加引入dubbo-\*.xml

<?xml version="1.0" encoding="UTF-8"?>
    <web-app version="2.5" xmlns="http://java.sun.com/xml/ns/javaee"
    	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    	xsi:schemaLocation="http://java.sun.com/xml/ns/javaee 
        http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">
    
    	
    	<context-param>
    		<param-name>contextConfigLocation</param-name>
    		<param-value>classpath:application-context.xml,classpath:dubbo-*.xml</param-value>
    	</context-param>
    	
    	<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:spring-mvc.xml</param-value>
    		</init-param>
    		<load-on-startup>1</load-on-startup>
    	</servlet>
    
    	<servlet-mapping>
    		<servlet-name>SpringMVC</servlet-name>
    		<url-pattern>*.shtml</url-pattern>
    	</servlet-mapping>
    	
    	
    	<listener>
    		<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
    	</listener>
    	
    	
    	<servlet>
    		<servlet-name>DruidStatView</servlet-name>
    		<servlet-class>com.alibaba.druid.support.http.StatViewServlet</servlet-class>
    	</servlet>
    	<servlet-mapping>
    		<servlet-name>DruidStatView</servlet-name>
    		<url-pattern>/druid/*</url-pattern>
    	</servlet-mapping>
    	<filter>
    		<filter-name>druidWebStatFilter</filter-name>
    		<filter-class>com.alibaba.druid.support.http.WebStatFilter</filter-class>
    		<init-param>
    			<param-name>exclusions</param-name>
    			<param-value>/public/*,*.js,*.css,/druid*,*.jsp,*.swf</param-value>
    		</init-param>
    		<init-param>
    			<param-name>principalSessionName</param-name>
    			<param-value>sessionInfo</param-value>
    		</init-param>
    		<init-param>
    			<param-name>profileEnable</param-name>
    			<param-value>true</param-value>
    		</init-param>
    	</filter>
    	<filter-mapping>
    		<filter-name>druidWebStatFilter</filter-name>
    		<url-pattern>/*</url-pattern>
    	</filter-mapping>
    	
    	
    	<welcome-file-list>
    		<welcome-file>index.jsp</welcome-file>
    	</welcome-file-list>
    </web-app>

（2）新增dubbo-server.xml配置

（3）UserDubboService接口，UserDubboServiceImpl实现类

package com.hky.web.dubbo.inter;
    
    import java.util.List;
    import com.hky.common.domain.User;
    public interface UserDubboService {
    	public List<User> queryAll();
    }

package com.hky.web.dubbo.impl;
    
    import java.util.ArrayList;
    import java.util.List;
    import com.alibaba.dubbo.config.annotation.Service;
    import com.hky.common.domain.User;
    import com.hky.web.dubbo.inter.UserDubboService;
    
    @Service
    public class UserDubboServiceImpl implements UserDubboService{
    	@Override
    	public List<User> queryAll() {
    		List<User> list = new ArrayList<User>();
            for (int i = 0; i < 10; i++) {
                User user = new User();
                user.setId(i);
                user.setPassword("123456");
                user.setUsername("username_" + i);
                list.add(user);
            }
            return list;
    	}
    }

## 4、mad-other应用配置 ##

web.xml及其他配置文件与mad-web一致，不同的有一点，  
作为消费方，增加dubbo-consumer.xml文件

此地有一小坑：在建立与mad-web相同接口时，不仅内容相同，居然包目录也要相同，否则启动报错。

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzIwNzQxMTMz_size_16_color_FFFFFF_t_70 1]

## 5、测试代码 ##

正常启动后，访问mad-other：[http://localhost:8081/mad-other/dubbo/index.shtml][http_localhost_8081_mad-other_dubbo_index.shtml]

package com.hky.other.controller;
    
    import java.util.List;
    
    import org.springframework.beans.factory.annotation.Autowired;
    import org.springframework.stereotype.Controller;
    import org.springframework.web.bind.annotation.RequestMapping;
    import org.springframework.web.bind.annotation.RequestMethod;
    
    import com.hky.common.domain.User;
    import com.hky.web.dubbo.inter.UserDubboService;
    
    
    @Controller
    @RequestMapping("/dubbo")
    public class UserDubboController {
    
    	@Autowired
    	private UserDubboService userDubboService;
    	
    	@RequestMapping(value="index", method = RequestMethod.GET)
    	public void myTest(){
    		List<User> all = userDubboService.queryAll();
    		
    		System.out.println(all);
    	}
    }

运行结果：  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzIwNzQxMTMz_size_16_color_FFFFFF_t_70 2]正常打印，有点low哈。。。

自己各种查资料奋斗的结果，有点小开心。

[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzIwNzQxMTMz_size_16_color_FFFFFF_t_70]: /images/20220320/32a4bc9ef11145869225f634255d7988.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzIwNzQxMTMz_size_16_color_FFFFFF_t_70 1]: /images/20220320/276e26a3ec924334b1bc8a406de1bc04.png
[http_localhost_8081_mad-other_dubbo_index.shtml]: http://localhost:8081/mad-other/dubbo/index.shtml
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzIwNzQxMTMz_size_16_color_FFFFFF_t_70 2]: /images/20220320/bd3ca6d8be4e4299b02eeb412c3d7e90.png