大数据开发前置技能__Dubbox快速入门

<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>cn.itcast.dubboxdemo</groupId>
  <artifactId>dubboxdemo-parent</artifactId>
  <version>0.0.1-SNAPSHOT</version>
  <packaging>pom</packaging>  
    <properties>		
		<spring.version>4.2.4.RELEASE</spring.version>
   </properties>    
	<dependencies>
		<!-- Spring -->
		<dependency>
			<groupId>org.springframework</groupId>
			<artifactId>spring-context</artifactId>
			<version>${spring.version}</version>
		</dependency>
		<dependency>
			<groupId>org.springframework</groupId>
			<artifactId>spring-beans</artifactId>
			<version>${spring.version}</version>
		</dependency>
		<dependency>
			<groupId>org.springframework</groupId>
			<artifactId>spring-webmvc</artifactId>
			<version>${spring.version}</version>
		</dependency>
		<dependency>
			<groupId>org.springframework</groupId>
			<artifactId>spring-jdbc</artifactId>
			<version>${spring.version}</version>
		</dependency>
		<dependency>
			<groupId>org.springframework</groupId>
			<artifactId>spring-aspects</artifactId>
			<version>${spring.version}</version>
		</dependency>
		<dependency>
			<groupId>org.springframework</groupId>
			<artifactId>spring-jms</artifactId>
			<version>${spring.version}</version>
		</dependency>
		<dependency>
			<groupId>org.springframework</groupId>
			<artifactId>spring-context-support</artifactId>
			<version>${spring.version}</version>
		</dependency>	
		<!-- dubbo相关 -->
		<dependency>
			<groupId>com.alibaba</groupId>
			<artifactId>dubbo</artifactId>
			<version>2.8.4</version>			
		</dependency>
		<dependency>
			<groupId>org.apache.zookeeper</groupId>
			<artifactId>zookeeper</artifactId>
			<version>3.4.6</version>
		</dependency>
		<dependency>
			<groupId>com.github.sgroschupf</groupId>
			<artifactId>zkclient</artifactId>
			<version>0.1</version>
		</dependency>
		<dependency>
			<groupId>javassist</groupId>
			<artifactId>javassist</artifactId>
			<version>3.11.0.GA</version>
		</dependency>		
	</dependencies>
   <build>  
	  <plugins>
	      <plugin>  
	          <groupId>org.apache.maven.plugins</groupId>  
	          <artifactId>maven-compiler-plugin</artifactId>  
	          <version>2.3.2</version>  
	          <configuration>  
	              <source>1.7</source>  
	              <target>1.7</target>  
	          </configuration>  
	      </plugin>  	      
	  </plugins>  
    </build> 
</project>
（2）创建Maven模块（JAR）  dubboxdemo-interface  

（3）创建Maven模块（WAR） dubboxdemo-service  
     在pom.xml 中，添加tomcat7插件
 <build>  
	  <plugins>
	      <plugin>
				<groupId>org.apache.tomcat.maven</groupId>
				<artifactId>tomcat7-maven-plugin</artifactId>
				<configuration>
					<!-- 指定端口 -->
					<port>8081</port>
					<!-- 请求路径 -->
					<path>/</path>
				</configuration>
	  	  </plugin>
	  </plugins>  
    </build>

 在webapp下创建WEB-INF/web.xml 

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xmlns="http://java.sun.com/xml/ns/javaee"
	xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"
	version="2.5">	
	<!-- 加载spring容器 -->
	<context-param>
		<param-name>contextConfigLocation</param-name>
		<param-value>classpath:applicationContext*.xml</param-value>
	</context-param>
	<listener>		<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
	</listener>	
</web-app>

（4）创建Maven模块（WAR） dubboxdemo-web   

```bash
 <build>  
	  <plugins>
	      <plugin>
				<groupId>org.apache.tomcat.maven</groupId>
				<artifactId>tomcat7-maven-plugin</artifactId>
				<configuration>
					<!-- 指定端口 -->
					<port>8082</port>
					<!-- 请求路径 -->
					<path>/</path>
				</configuration>
	  	  </plugin>
	  </plugins>  
    </build>
 在webapp下创建WEB-INF/web.xml 
 
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xmlns="http://java.sun.com/xml/ns/javaee"
	xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"
	version="2.5">	
   <!-- 解决post乱码 -->
	<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>
	<filter-mapping>
		<filter-name>CharacterEncodingFilter</filter-name>
		<url-pattern>/*</url-pattern>
	</filter-mapping>	
  <servlet>
  	<servlet-name>springmvc</servlet-name>
  	<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
  	<!-- 指定加载的配置文件 ，通过参数contextConfigLocation加载-->
  	<init-param>
  		<param-name>contextConfigLocation</param-name>
  		<param-value>classpath:springmvc.xml</param-value>
  	</init-param>
  </servlet>  
  <servlet-mapping>
  	<servlet-name>springmvc</servlet-name>
  	<url-pattern>*.action</url-pattern>
  </servlet-mapping>
</web-app>

（5）构建依赖，让dubboxdemo-service 模块和dubboxdemo-web模块都依赖dubboxdemo-interface模块

3.1.2服务提供者
开发步骤：
（1）创建业务接口
在dubboxdemo-service 模块创建包cn.itcast.dubboxdemo.service，用于存放业务接口，创建接口UserService 

```bash
package cn.itcast.dubboxdemo.service;
/**
 * 业务接口
 * @author Administrator
 *
 */
public interface UserService {	
	public String getName();	
}
（2）创建业务实现类
创建包cn.itcast.dubboxdemo.service.impl ，用于存放业务实现类。创建业务实现类：
package cn.itcast.dubboxdemo.service.impl;
import org.springframework.stereotype.Service;
import cn.itcast.dubbodemo.service.UserService;
@Service
public class UserServiceImpl implements UserService {
	public String getName() {		
		return "itheima";
	}
}

package cn.itcast.dubboxdemo.controller;
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.ResponseBody;
import cn.itcast.dubbodemo.service.UserService;
@Controller
@RequestMapping("/user")
public class UserController {
	@Autowired
	private UserService userService;	
	@RequestMapping("/name")
	@ResponseBody
	public String showName(){
		return userService.getName();
	}		
}

<context:component-scan base-package="cn.itcast.dubboxdemo.controller" />
<mvc:annotation-driven >
	<mvc:message-converters register-defaults="false">
		<bean class="org.springframework.http.converter.StringHttpMessageConverter">  
			<constructor-arg value="UTF-8" />
		</bean>  
	</mvc:message-converters>	
</mvc:annotation-driven>	
<!-- 引用dubbo 服务 -->
<dubbo:application name="dubboxdemo-web" />
<dubbo:registry address="zookeeper://192.168.17.129:2181"/>
<dubbo:reference interface="cn.itcast.dubboxdemo.service.UserService" id="userService" />

package cn.itcast.dubboxdemo.service.impl;
import com.alibaba.dubbo.config.annotation.Service;
import cn.itcast.dubboxdemo.service.UserService;
@Service
public class UserServiceImpl implements UserService {
	public String getName() {		
		return "itcast";
	}
}

package cn.itcast.dubboxdemo.controller;
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.ResponseBody;
import cn.itcast.dubbodemo.service.UserService;
@Controller
@RequestMapping("/user")
public class UserController {
	@Autowired
	private UserService userService;	
	@RequestMapping("/name")
	@ResponseBody
	public String showName(){
		return userService.getName();
	}		
}

	<!-- 引用dubbo 服务 -->
 <dubbo:annotation package="cn.itcast.dubboxdemo.controller" />  	
<dubbo:application name="dubboxdemo-web" />
<dubbo:registry address="zookeeper://192.168.17.129:2181"/>